JPH08159295A - Non-contact type mechanical seal - Google Patents
Non-contact type mechanical sealInfo
- Publication number
- JPH08159295A JPH08159295A JP6303298A JP30329894A JPH08159295A JP H08159295 A JPH08159295 A JP H08159295A JP 6303298 A JP6303298 A JP 6303298A JP 30329894 A JP30329894 A JP 30329894A JP H08159295 A JPH08159295 A JP H08159295A
- Authority
- JP
- Japan
- Prior art keywords
- dynamic pressure
- wear
- pressure generating
- groove
- wear detection
- 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
Landscapes
- Mechanical Sealing (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、タービン，コンプレッ
サ，ブロワ等の回転機器において使用される非接触形メ
カニカルシールに関するものであり、具体的には、回転
側密封端面と静止側密封端面とが、両密封端面間に一方
の密封端面に形成した動圧発生溝により動圧を発生させ
ることにより、非接触の近接状態で相対回転せしめられ
るように構成された非接触形メカニカルシールに関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact type mechanical seal used in a rotating machine such as a turbine, a compressor, a blower, and more specifically, a rotary side sealing end surface and a stationary side sealing end surface. The present invention relates to a non-contact type mechanical seal configured to be relatively rotated in a non-contact close state by generating a dynamic pressure by a dynamic pressure generating groove formed on one sealing end surface between both sealing end surfaces. .
【０００２】[0002]
【従来の技術】この種の非接触形メカニカルシールにあ
って、動圧発生溝の深さは、これを形成した密封端面が
運転初期における両密封端面の接触や運転中における両
密封端面間に形成される流体膜との接触により摩耗され
ることによって、長期使用のうちには摩耗して浅くな
る。一方、動圧発生溝の深さは、当該メカニカルシール
のシール性能を左右する極めて重要な要素であり、動圧
発生溝が一定量（以下「許容摩耗限度」という）以上摩
耗して、その深さが設計値より浅くなると、密封端面間
を非接触状態に保持するに充分な動圧，静圧が発生せ
ず、良好なシール性能を発揮し得ない。2. Description of the Related Art In a non-contact type mechanical seal of this type, the depth of the dynamic pressure generating groove is such that the sealing end face forming this groove is in contact with both sealing end faces at the initial stage of operation or between both sealing end faces during operation. The wear caused by contact with the formed fluid film causes wear and shallowness during long-term use. On the other hand, the depth of the dynamic pressure generation groove is an extremely important factor that influences the sealing performance of the mechanical seal, and the depth of the dynamic pressure generation groove when the dynamic pressure generation groove is worn over a certain amount (hereinafter referred to as "allowable wear limit"). Is less than the design value, sufficient dynamic pressure and static pressure to hold the sealed end faces in a non-contact state will not be generated, and good sealing performance cannot be achieved.
【０００３】したがって、一般には、動圧発生溝の深さ
を定期的に検査して、継続使用が可能かどうかを判定
し、更に継続使用が可能であれば、爾後どの程度使用が
可能かどうかを判定するようにしている。Therefore, in general, the depth of the dynamic pressure generating groove is regularly inspected to determine whether or not continuous use is possible, and if further continuous use is possible, to what extent after that it can be used. Is determined.
【０００４】[0004]
【発明が解決しようとする課題】ところで、動圧発生溝
の深さは、全く摩耗しない状態においても数μｍ乃至数
十μｍといった極く浅いものであるから、それが完全に
摩耗消滅しているかどうかは目視や指爪による触感で判
別することができるが、どの程度摩耗しているかは格別
の測定器（例えば、表面形状測定器等）を使用して測
定，検査せざるを得ない。By the way, since the depth of the dynamic pressure generating groove is extremely shallow, such as several .mu.m to several tens of .mu.m, even if it is not worn at all, is it completely worn away? Whether or not it can be determined visually or by touch with a fingernail, but how much wear has to be measured and inspected using a special measuring instrument (for example, a surface profile measuring instrument).
【０００５】しかし、このような測定器による溝深さの
測定，検査は現場で行うことはできないため、当該メカ
ニカルシールの保守点検作業を効率良く行い得ないでい
たのが実情である。However, since the measurement and inspection of the groove depth by such a measuring device cannot be carried out on site, the maintenance and inspection work of the mechanical seal cannot be carried out efficiently.
【０００６】本発明は、このような実情に鑑み、動圧発
生溝の摩耗程度を目視により容易に判定することがで
き、保守点検作業を効率良く行い得て、長期に亘って良
好なシール性能を維持することができる非接触形メカニ
カルシールを提供することを目的とするものである。In view of such circumstances, the present invention makes it possible to easily visually judge the degree of wear of the dynamic pressure generating groove, to efficiently perform maintenance and inspection work, and to obtain a good sealing performance for a long period of time. It is an object of the present invention to provide a non-contact type mechanical seal capable of maintaining the above.
【０００７】[0007]
【課題を解決するための手段】本発明は、回転側密封端
面と静止側密封端面とが、両密封端面間に一方の密封端
面に形成した動圧発生溝により動圧を発生させることに
より、非接触の近接状態で相対回転せしめられるように
構成された非接触形メカニカルシールにおいて、上記の
目的を達成すべく、特に、前記一方の密封端面における
動圧発生溝が形成されていない部位に、動圧発生溝より
浅い線状又は点状の凹部で構成される摩耗検知用表示を
刻設しておくことを提案するものである。この場合、動
圧発生溝の摩耗程度をより的確に目視判定できるよう
に、深さを異にする複数種の摩耗検知用表示を刻設して
おくことが好ましい。According to the present invention, a rotary side sealing end surface and a stationary side sealing end surface generate dynamic pressure by a dynamic pressure generating groove formed in one sealing end surface between both sealing end surfaces. In a non-contact type mechanical seal configured to be relatively rotated in a non-contact proximity state, in order to achieve the above object, in particular, in a portion where the dynamic pressure generating groove in the one sealing end face is not formed, It is proposed to engrave a wear detection display composed of a linear or dot-shaped recess shallower than the dynamic pressure generation groove. In this case, it is preferable to engrave a plurality of types of wear detection displays having different depths so that the wear degree of the dynamic pressure generation groove can be more accurately visually determined.
【０００８】[0008]
【作用】摩耗検知用表示が消滅しているか否かを目視判
別することにより、動圧発生溝の摩耗程度を容易に判断
することができる。It is possible to easily determine the degree of wear of the dynamic pressure generation groove by visually determining whether or not the wear detection display has disappeared.
【０００９】すなわち、摩耗検知用表示が消滅しておれ
ば、動圧発生溝が当該表示の深さ以上に摩耗しているこ
とが判断できる。したがって、当該表示の深さを動圧発
生溝の許容摩耗限度に一致させておけば、その消滅の有
無を目視判別することにより、継続使用が可能かどうか
を容易に判断することができる。That is, if the wear detecting display disappears, it can be determined that the dynamic pressure generating groove is worn more than the depth of the display. Therefore, if the depth of the display is matched with the allowable wear limit of the dynamic pressure generation groove, it is possible to easily determine whether or not continuous use is possible by visually determining whether or not the wear has occurred.
【００１０】また、深さの異なる複数種の摩耗検知用表
示が形成されている場合には、例えば、深さをｄ1 ，ｄ
2 （ｄ1 ＜ｄ2 ）とする２種の摩耗検知用表示が形成さ
れている場合、ｄ1 の表示は消滅しているが、ｄ2 の表
示が消滅していないことが目視判別されるときは、動圧
発生溝の摩耗量がｄ1 以上でｄ2 未満であると判断する
ことができる。したがって、深さの異なる複数種の摩耗
検知用表示を形成しておくことにより、動圧発生溝の摩
耗程度が継続使用できる範囲にあるかどうかの判断のみ
ならず、その摩耗量をもある程度正確に判断することが
できる。Further, when a plurality of types of wear detection displays having different depths are formed, for example, the depths d 1 , d
When two types of wear detection displays of 2 (d 1 <d 2 ) are formed, it is visually determined that the display of d 1 has disappeared but the display of d 2 has not disappeared. In this case, it can be determined that the amount of wear of the dynamic pressure generating groove is d 1 or more and less than d 2 . Therefore, by forming multiple types of wear detection displays with different depths, not only can the wear level of the dynamic pressure generation groove be judged to be within the range of continuous use, but the wear amount can also be estimated to some extent. Can be judged.
【００１１】ところで、密封端面の歪みや回転軸の撓み
等により両密封端面の平行度が損なわれるとシール性能
が低下する場合があるが、その原因究明は一般に困難で
ある。しかし、かかる場合、密封端面の摩耗量が周方向
又は径方向において異なるため、同一深さの摩耗検知用
表示群がすべて消滅しているかどうかを目視判別するこ
とによって、密封端面の歪み具合等を正確に判断するこ
とができ、シール性能の低下原因を容易に究明すること
ができる。By the way, if the parallelism between the two sealing end faces is impaired due to the distortion of the sealing end faces, the bending of the rotary shaft, etc., the sealing performance may deteriorate, but it is generally difficult to find out the cause. However, in such a case, since the wear amount of the sealed end surface is different in the circumferential direction or the radial direction, it is possible to visually check whether or not all the wear detection display groups having the same depth have disappeared to check the degree of distortion of the sealed end surface. It is possible to make an accurate judgment and easily find out the cause of the deterioration in the sealing performance.
【００１２】なお、摩耗検知用表示を構成する凹部は、
動圧発生溝より浅いものであり、しかも摩耗検知用表示
の大きさはその消滅の有無を目視判別できる程度の小さ
なもので足りるから、摩耗検知用表示の存在によって
は、両密封端面によるシール機能（動圧発生溝による動
圧発生機能等）に何らの悪影響を及ぼすことがない。Incidentally, the concave portion constituting the wear detection display is
Since it is shallower than the dynamic pressure generation groove, and the size of the wear detection display is small enough to visually determine whether or not it has disappeared, depending on the presence of the wear detection display, the sealing function by both sealed end faces (Dynamic pressure generation function by dynamic pressure generation groove, etc.) is not adversely affected.
【００１３】[0013]
【実施例】以下、本発明の構成を図１〜図３に示す実施
例に基づいて具体的に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be specifically described below based on the embodiments shown in FIGS.
【００１４】図１に示す非接触形メカニカルシールにお
いて、１は高圧側密封流体領域（例えば、タービン等の
機内である高圧ガス領域）Ｈと低圧側密封流体領域（例
えば、タービン等の機外である大気領域）Ｌとを区画す
るケーシング、２はケーシング１を洞貫する回転軸、３
はケーシング１に保持環４及びＯリング５を介して軸線
方向摺動可能に保持された静止密封環、６は静止密封環
３に対向して回転軸２に固定された回転密封環、７はケ
ーシング１と保持環４との間に介挿されて、静止密封環
３を回転密封環６へと押圧附勢するスプリングである。
なお、密封環３，６の構成材はシール条件等に応じて適
宜に選定されるが、一般には、カーボン，ＷＣ，ＳｉＣ
等の超硬合金，セラミックス等が使用される。In the non-contact mechanical seal shown in FIG. 1, 1 is a high-pressure side sealed fluid region (for example, a high-pressure gas region inside the turbine or the like) H and a low-pressure side sealed fluid region (for example, outside the turbine or the like). A casing that divides a certain atmospheric region L), 2 is a rotating shaft that penetrates the casing 1, 3
Is a stationary seal ring held in the casing 1 via a retaining ring 4 and an O-ring 5 so as to be slidable in the axial direction, 6 is a rotary seal ring fixed to the rotary shaft 2 facing the stationary seal ring 3, and 7 is a rotary seal ring. It is a spring that is inserted between the casing 1 and the holding ring 4 and presses and biases the stationary seal ring 3 toward the rotary seal ring 6.
The constituent materials of the sealing rings 3 and 6 are appropriately selected according to the sealing conditions and the like, but in general, carbon, WC, SiC
Cemented carbide, ceramics, etc. are used.
【００１５】回転密封環６の端面である回転側密封端面
６ａには、図１〜図３に示す如く、径方向に縦列し且つ
直径線に対して対称形状をなすＬ字形の第１動圧発生溝
８1…と第２動圧発生溝８2 …とからなる、動圧発生溝
ユニット８を周方向に等間隔を隔てて複数組並列状に形
成してあって、回転側密封端面６ａとこれに対向する静
止密封環３の端面である静止側密封端面３ａとの相対回
転に伴い、その回転方向に拘わらず、動圧を発生させる
ようになっている。すなわち、回転軸２つまり密封端面
６ａがＡ方向に回転するときには第１動圧発生溝８1 …
により動圧が発生せしめられ、また密封端面６ａが反Ａ
方向に回転するときには第２動圧発生溝群８2 …により
動圧が発生せしめられて、何れの場合にも、両密封端面
３ａ，６ａ間を高圧側密封流体による流体膜が介在する
非接触状態に保持しつつ、両密封流体領域Ｈ，Ｌ間を遮
蔽シールするようになっている。なお、各動圧発生溝８
1，８2 の溝深さｄ及び溝幅は一定であり、シール条件
等に応じて適宜に設定される。また、動圧発生溝８1 ，
８2 の許容摩耗限度は、シール条件等に応じて適宜に決
定されるが、この実施例では、溝深さｄを５μｍとし
て、許容摩耗限度を３μｍとしてある。As shown in FIGS. 1 to 3, on the rotary side sealing end surface 6a which is the end surface of the rotary sealing ring 6, there is an L-shaped first dynamic pressure which is arranged in the radial direction and is symmetrical with respect to the diameter line. A plurality of dynamic pressure generating groove units 8 each including a generating groove 8 1 and a second dynamic pressure generating groove 8 2 are formed in parallel at equal intervals in the circumferential direction. Along with the relative rotation between the stationary sealing ring 3 and the stationary side sealing end surface 3a that faces the stationary sealing ring 3, a dynamic pressure is generated regardless of the rotation direction. That is, when the rotating shaft 2, that is, the sealing end surface 6a rotates in the A direction, the first dynamic pressure generating groove 8 1 ...
Dynamic pressure is generated, and the sealing end face 6a is
When rotating in the direction, the dynamic pressure is generated by the second dynamic pressure generating groove group 8 2 ... In any case, a non-contact state in which a fluid film of the high-pressure side sealing fluid intervenes between the both sealing end faces 3a and 6a. While maintaining the state, a shielding seal is provided between the two sealed fluid regions H and L. In addition, each dynamic pressure generating groove 8
The groove depth d and the groove width of 1 and 8 2 are constant, and are appropriately set according to sealing conditions and the like. In addition, the dynamic pressure generating groove 8 1 ,
The allowable wear limit of 8 2 is appropriately determined according to the sealing conditions and the like, but in this embodiment, the groove depth d is 5 μm and the allowable wear limit is 3 μm.
【００１６】而して、回転側密封端面６ａには、図２及
び図３に示す如く、動圧発生溝８1，８2 が形成されて
いない部位に配して、深さの異なる線状の凹部（以下
「線状溝」という）により構成される複数種の摩耗検知
用表示９1 ，９2 ，９3 が形成されていて、保守点検時
においてこれらの表示９1 ，９2 ，９3 が消滅している
か否かを目視判別することにより、動圧発生溝８1 ，８
2 の摩耗程度や密封端面３ａ，６ａの平行度を視認検知
することができるようになっている。As shown in FIGS. 2 and 3, the rotary side sealing end surface 6a is arranged at a portion where the dynamic pressure generating grooves 8 1 and 8 2 are not formed, and has linear shapes with different depths. A plurality of types of wear detection displays 9 1 , 9 2 , 9 3 formed by the concave portions (hereinafter referred to as “linear grooves”) are formed, and these displays 9 1 , 9 2 , 9 are displayed at the time of maintenance and inspection. By visually deciding whether or not 3 has disappeared, the dynamic pressure generating grooves 8 1 , 8
The degree of wear of No. 2 and the parallelism of the sealed end faces 3a and 6a can be visually detected.
【００１７】すなわち、回転側密封端面６ａにおいて
は、図２に示す如く、隣接する動圧発生溝ユニット８，
８間の部位であるランド部６ｂに、数字「１」を表する
第１摩耗検知用表示９1 …と数字「２」を表する第１摩
耗検知用表示９2 …と数字「３」を表する第３摩耗検知
用表示９3 …とが刻設されている。各摩耗検知用表示９
1 ，９2 ，９3 を構成する線状溝の溝幅は同一である
が、溝深さｄ1 ，ｄ2 ，ｄ 3 は、図３に示す如く、動圧
発生溝８1 ，８2 の深さｄより浅い範囲において異なら
しめてある。すなわち、ｄ1 ＜ｄ2 ＜ｄ3 ＜ｄに設定し
てあり、更にｄ3 −ｄ2 ＝ｄ2 −ｄ1 とし、ｄ3 を動圧
発生溝８1 ，８2 の許容摩耗限度に一致させてある。と
ころで、各摩耗検知用表示９1 ，９2 ，９3 が表する数
字は、単に、線状溝の深さｄ1 ，ｄ2 ，ｄ3 を間接的に
示す（溝深さの最も浅いものを「１」とし、中間のもの
を「２」とし、最も深いものを「３」とするように、深
さの順番を示す）ものであっても、深さｄ1 ，ｄ2 ，ｄ
3 の寸法を直接示す（「１」の深さｄ1 が１μｍ、
「２」の深さｄ2 が２μｍ、「３」の深さｄ3 が３μｍ
であることを示す）ものであっても、何れでもよいが、
この実施例では後者を採用している。なお、摩耗検知用
表示９1 ，９2 ，９3 が表する数字等の大きさやこれを
構成する線状溝の溝幅は、両密封端面３ａ，６ａによる
シール機能を妨げない範囲であって当該表示９1 ，
９2 ，９3 の消滅の有無を目視判別できる範囲におい
て、任意に設定することができる。That is, at the rotary side sealing end face 6a
As shown in FIG. 2, the adjacent dynamic pressure generating groove units 8,
Indicate the number "1" on the land portion 6b which is a portion between 8
First wear detection display 91... and the 1st Ma representing the number "2"
Wear detection display 92... and third wear detection that represents the number "3"
Display 93... and are engraved. Each wear detection display 9
1, 92, 93The width of the linear grooves that make up the
But the groove depth d1, D2, D 3Is the dynamic pressure, as shown in Fig. 3.
Generation groove 81, 82If the difference is shallower than the depth d of
It's tightened. That is, d1<D2<D3<Set to d
And d3-D2= D2-D1And d3Dynamic pressure
Generation groove 81, 82It is in conformity with the allowable wear limit of. When
Indication for each wear detection 91, 92, 93The number represented by
The letter is simply the depth d of the linear groove.1, D2, D3Indirectly
Shown (The shallowest groove depth is "1", the middle one
"2" and the deepest one is "3".
Depth order d)1, D2, D
3Directly indicate the dimension of (1 depth d1Is 1 μm,
Depth of "2" d2Is 2 μm and the depth d is “3”3Is 3 μm
, Which means that either
The latter is adopted in this embodiment. For wear detection
Display 91, 92, 93And the size of the numbers represented by
The groove width of the linear groove to be formed depends on both sealing end faces 3a and 6a.
The display 9 within a range that does not interfere with the sealing function1,
92, 93Within the range where it can be visually discerned whether or not
And can be set arbitrarily.
【００１８】以上のように構成された非接触形メカニカ
ルシールにあっては、「１」の表示９1 は消滅している
が、「２」の表示９2 及び「３」の表示９3 が残存して
いることが目視判別された場合は、動圧発生溝８1 ，８
2 の摩耗量（ないし密封端面６の摩耗量）が１μｍ以上
で２μｍ未満であると判定することができ、「１」の表
示９1 及び「２」の表示９2 は消滅しているが、「３」
の表示９3 が残存していることが目視判別された場合
は、動圧発生溝８1 ，８2 の摩耗量が２μｍ以上で３μ
ｍ未満であると判定することができ、すべての表示
９1 ，９2 ，９3 が残存していることが目視判別された
場合は、動圧発生溝８1 ，８2 の摩耗量が１μｍ未満で
あると判定することができ、何れの場合も、継続使用が
可能であることを容易且つ的確に判断することができ
る。しかも、このように摩耗程度を１μｍの範囲内で把
握することにより、爾後の継続使用可能期間を或る程度
的確に予測することも可能となる。In the non-contact type mechanical seal constructed as described above, the indication 9 1 of "1" disappears, but the indication 9 2 of " 2 " and the indication 9 3 of "3" are eliminated. When it is visually discriminated that the residual pressure remains, the dynamic pressure generating grooves 8 1 , 8
It can be determined that the wear amount of 2 (or the wear amount of the sealed end surface 6) is 1 μm or more and less than 2 μm, and the display 9 1 of “ 1 ” and the display 9 2 of “2” disappear. "3"
When it is visually judged that the indication 9 3 remains, the wear amount of the dynamic pressure generating grooves 8 1 and 8 2 is 3 μm when the wear amount is 2 μm or more.
If it is possible to determine that it is less than m, and it is visually determined that all the indications 9 1 , 9 2 , and 9 3 remain, the wear amount of the dynamic pressure generating grooves 8 1 and 8 2 is 1 μm. It is possible to determine that it is less than, and in any case, it is possible to easily and accurately determine that continuous use is possible. Moreover, by grasping the degree of wear within the range of 1 μm in this manner, it becomes possible to accurately predict the continuous usable period after a certain degree.
【００１９】また、すべての表示９1 ，９2 ，９3 が消
滅していることが目視判別された場合は、動圧発生溝８
1 ，８2 の摩耗量が許容摩耗限度を超えていると判定で
き、継続使用ができないと判断することができる。した
がって、動圧発生溝８1 ，８ 2 が許容摩耗限度を超えて
摩耗しているにも拘わらず継続使用し、そのことを大量
の洩れを生じるまで気付かないような事態が生じるよう
なことがない。しかも、上記した如く事前に継続使用可
能期間を予測できるため、つまり動圧発生溝８ 1 ，８2
の摩耗量が許容摩耗限度に達する時点を予測できるた
め、かかる予測時点で保守点検作業を行うことにより、
動圧発生溝８1 ，８2 が許容摩耗限度を僅かに超えた段
階で、これを発見することができ、大量洩れを未然に防
止することができる。All displays 91, 92, 93Disappears
If it is visually discriminated that it has disappeared, the dynamic pressure generating groove 8
1, 82It is judged that the amount of wear exceeds the allowable wear limit.
Therefore, it can be determined that continuous use is not possible. did
Therefore, the dynamic pressure generating groove 81, 8 2Exceeds the allowable wear limit
Continue to use it even if it is worn, and use a lot of it.
So that you may not notice it until the leak occurs
There is nothing. Moreover, it can be used continuously in advance as described above.
Since the active period can be predicted, that is, the dynamic pressure generation groove 8 1, 82
The time when the wear amount reaches the allowable wear limit can be predicted.
Therefore, by performing maintenance and inspection work at the time of such prediction,
Dynamic pressure generating groove 81, 82Is slightly over the allowable wear limit
You can discover this on the floor and prevent large leaks.
You can stop.
【００２０】また、同一の深さの表示群について消滅し
ているものと消滅していないものとが混在していること
が目視判別された場合は、両密封端面３ａ，６ａの平行
度が密封端面の歪み等により損なわれていると判断する
ことができる。したがって、かかる平行度の低下による
シール性能の低下を未然に防止すること、或いはシール
性能の低下原因が平行度の低下によることを究明するこ
とが容易となり、保守点検作業を効率良く行うことがで
きる。When it is visually judged that the display groups having the same depth have both disappeared and not disappeared, the parallelism between the sealing end faces 3a and 6a is sealed. It can be determined that the end face is damaged due to distortion or the like. Therefore, it becomes easy to prevent the deterioration of the sealing performance due to the decrease of the parallelism, or it is easy to determine that the cause of the deterioration of the sealing performance is the decrease of the parallelism, and the maintenance and inspection work can be efficiently performed. .
【００２１】さらに、各摩耗検知用表示９1 ，９2 ，９
3 は、上記した如く両密封端面３ａ，６ａによるシール
機能を妨げない微小なものであるが、高圧側密封流体が
液体である場合、当該摩耗検知用表示を構成する線状溝
には流体が侵入して、それが運転停止時においても両密
封端面３ａ，６ａ間に残存することになる。したがっ
て、運転開始時においては、この残存流体が両密封端面
３ａ，６ａ間の潤滑剤としても機能し、起動トルクの低
減に寄与することになる。Further, the wear detection displays 9 1 , 9 2 , 9
As described above, 3 is a minute one that does not hinder the sealing function of both the sealing end faces 3a and 6a. However, when the high-pressure side sealing fluid is a liquid, fluid is not present in the linear groove that constitutes the wear detection display. When it enters, it remains between the sealed end faces 3a and 6a even when the operation is stopped. Therefore, at the start of the operation, this residual fluid also functions as a lubricant between the sealed end surfaces 3a and 6a, which contributes to the reduction of the starting torque.
【００２２】なお、本発明の構成は、上記実施例に限定
されるものではなく、本発明の基本原理を逸脱しない範
囲において適宜に変更，改良することができる。The structure of the present invention is not limited to the above-mentioned embodiment, and can be appropriately changed or improved within a range not departing from the basic principle of the present invention.
【００２３】例えば、図４に示すものでは、隣接する動
圧発生溝ユニット８，８間の部位であるランド部６ｂ
に、一本の短尺直線状の凹部（以下「短尺直線溝」とい
う）で構成されるローマ数字「Ｉ」を模した第１摩耗検
知用表示１９1 …と、並列する二本の短尺直線溝で構成
されるローマ数字「II」を模した第２摩耗検知用表示１
９2 …と、並列する三本の短尺直線溝で構成されるロー
マ数字「III」を模した第３摩耗検知用表示１９3 …と
を刻設してある。各摩耗検知用表示１９1 ，１９ 2 ，１
９3 を構成する短尺直線溝の長さ及び溝幅は同一である
が、その溝深さは、上記実施例におけると同様に、第３
摩耗検知用表示１９3 については動圧発生溝８1 ，８2
の許容摩耗限度に一致する深さとされており、第２摩耗
検知用表示１９2 については第３摩耗検知用表示１９3
よりも所定量浅く、更に第１摩耗検知用表示１９1 につ
いては第２摩耗検知用表示１９2 よりも所定量浅く設定
されている。かかる構成においても、各摩耗検知用表示
１９1 ，１９2 ，１９3 の消滅の有無を目視判別するこ
とにより、上記実施例におけると同様にして、動圧発生
溝８1 ，８2 の摩耗量等を容易に視認判定することがで
きる。For example, in the one shown in FIG.
Land portion 6b which is a portion between the pressure generating groove units 8 and 8.
In addition, one short linear recess (hereinafter referred to as "short linear groove"
The first wear test imitating the Roman numeral "I"
Intelligence display 191... and two short straight grooves in parallel
Second wear detection display 1 simulating the Roman numeral "II"
92, And three short linear grooves in parallel
Third wear detection display 19 simulating the number "III"3…When
Is engraved. Each wear detection display 191, 19 2, 1
93The length and groove width of the short linear groove that constitutes the
However, the groove depth is the same as that in the above-mentioned embodiment.
Wear detection display 193For the dynamic pressure generation groove 81, 82
The depth is set to match the allowable wear limit of
Display for detection 192For the third wear detection display 193
A predetermined amount shallower than the first wear detection display 191Nitsu
Then, the second wear detection display 192Set a predetermined amount shallower than
Has been done. Even in such a configuration, each wear detection display
191, 192, 193The presence or absence of
As a result, in the same way as in the above embodiment, the dynamic pressure is generated.
Groove 81, 82It is possible to easily visually judge the wear amount of
Wear.
【００２４】また、本発明は、メカニカルシールの構造
（動圧発生溝の形状等）に拘わらず適用することができ
る。例えば、図５及び図６に示すものでは、回転側密封
端面６ａに、周方向に等間隔を隔ててスパイラル状の動
圧発生溝８ａ…が形成されており、回転軸２つまり密封
端面６ａがＡ方向に回転したときにのみ、両密封端面３
ａ，６ａ間に動圧を発生させるようになっている。そし
て、回転側密封端面６ａにおいては、図５及び図６に示
す如く、隣接する動圧発生溝８ａ，８ａ間のランド部６
ｂに、「Ａ」の文字からなる第１摩耗検知用表示２９1
…を動圧発生溝８ａの許容摩耗限度に一致する深さの線
状溝により形成すると共に、「Ｂ」の文字からなる第２
摩耗検知用表示２９2 …を上記線状溝より浅い線状溝で
形成してある。かかる構成においても、「Ａ」「Ｂ」の
消滅の有無を目視判別することにより、上記実施例にお
けると同様にして、動圧発生溝８ａの摩耗量等を容易に
視認判定することができる。The present invention can be applied regardless of the structure of the mechanical seal (the shape of the dynamic pressure generating groove, etc.). For example, in those shown in FIGS. 5 and 6, spiral-shaped dynamic pressure generating grooves 8a ... Are formed at equal intervals in the circumferential direction on the rotary side sealing end surface 6a, and the rotary shaft 2, that is, the sealing end surface 6a is formed. Only when rotating in the A direction, both sealing end faces 3
A dynamic pressure is generated between a and 6a. Then, on the rotary side sealing end face 6a, as shown in FIGS. 5 and 6, the land portion 6 between the adjacent dynamic pressure generating grooves 8a, 8a is formed.
The first wear detection display 29 1 consisting of the letter “A” on b
Is formed by a linear groove having a depth that matches the allowable wear limit of the dynamic pressure generating groove 8a, and is formed by the second character "B".
The wear detecting display 29 2 is formed by a linear groove shallower than the linear groove. In such a configuration as well, by visually deciding whether or not "A" and "B" have disappeared, the wear amount of the dynamic pressure generating groove 8a and the like can be easily visually discriminated in the same manner as in the above-mentioned embodiment.
【００２５】また、摩耗検知用表示は、上記した如き数
字，文字やこれらを模したものの他、記号や図形等であ
ってもよく、また上記した如き線状の凹部で構成せず、
点状の凹部で構成するようにしてもよい。例えば、図７
に示すものでは、図６に示すものと同様の動圧発生溝８
ａ…を形成した回転側密封端面６ａのランド部６ｂに、
一つの点状の凹部で構成される第１摩耗検知用表示３９
1 …と、並列する二つの点状の凹部で構成される第２検
知用表示３９2 …と、正三角形の頂点に対応する配置と
された三つの点状の凹部で構成される第３検知用表示３
９3 …とを形成してある。各摩耗検知用表示３９1 ，３
９2 ，３９3 を構成する凹部の深さは、図２又は図４に
示すものと同様に、第３摩耗検知用表示３９3 について
は動圧発生溝８ａの許容摩耗限度に一致する深さとされ
ており、第２摩耗検知用表示３９ 2 については第３摩耗
検知用表示３９3 よりも所定量浅く、更に第１摩耗検知
用表示３９1 については第２摩耗検知用表示３９2 より
も所定量浅く設定されている。かかる構成においても、
各摩耗検知用表示１９1 ，１９2 ，１９3 の消滅の有無
を目視判別することにより、上記実施例におけると同様
にして、動圧発生溝８ａの摩耗量等を容易に視認判定す
ることができる。なお、各摩耗検知用表示３９1 ，３９
2 ，３９3 を構成する凹部は同一径の微小な円形状をな
しているが、これら凹部を径の異なるものとしてもよ
い。Further, the wear detection display has the above-mentioned number.
In addition to letters, characters and imitations of these, symbols and figures
Alternatively, the linear concave portion as described above is not used,
You may make it comprised with a dot-shaped recessed part. For example, in FIG.
In the example shown in FIG. 6, the dynamic pressure generating groove 8 similar to that shown in FIG.
a is formed on the land portion 6b of the rotary side sealing end surface 6a,
First wear detection display 39 composed of one dot-shaped recess
1, And a second inspection consisting of two point-shaped recesses arranged in parallel.
Intelligence display 392… And the placement corresponding to the vertices of an equilateral triangle
Third detection display 3 composed of three dotted recesses
93... and are formed. Each wear detection display 391, 3
92, 393The depth of the concave portion forming the
Similar to what is shown, the third wear detection display 393about
Is a depth that matches the allowable wear limit of the dynamic pressure generating groove 8a.
Display 39 for second wear detection 2For third wear
Detection display 393A predetermined amount shallower than the
Display 391About the second wear detection display 392Than
Is also set shallower by a predetermined amount. Even in this configuration,
Each wear detection display 191, 192, 193The disappearance of
By visually observing, the same as in the above example
The wear amount of the dynamic pressure generating groove 8a and the like can be easily visually identified.
Can be In addition, each wear detection display 391, 39
2, 393The recesses that make up the
However, these recesses may have different diameters.
Yes.
【００２６】このように、本発明は、動圧発生溝により
両密封端面３ａ，６ａ間に動圧を発生させるものであれ
ば、動圧発生溝の形状，数，配置等に拘わらず、如何な
る形式の非接触形メカニカルシールにも、上記実施例と
同様に好適に適用できるものである。また、動圧発生溝
が形成された密封端面には、上記した如く深さの異なる
線状又は点状の凹部により構成される複数種の摩耗検知
用表示を刻設しておくことが好ましいが、深さ一定の凹
部により構成される一種の摩耗検知用表示を刻設するの
みでもよい。また、摩耗検知用表示は、上記したよう
に、数字，文字，記号，図形やこれらを組み合わせたも
の等、任意に選択することができる。例えば、動圧発生
溝が形成された密封端面に、深さの異なる凹部又は深さ
が一定の凹部により当該密封端面を有する密封環の寸法
等を刻設し、これを摩耗検知用表示として使用すること
も可能である。このようにすれば、上記した保守点検時
におけるメリットに加えて、メカニカルシールの組立時
において密封環の選択を誤ったりする等の取扱上のミス
を防止することができるといったメリットもある。ま
た、摩耗検知用表示を刻設する箇所は、上記したランド
部６ａのみに限定されず、動圧発生溝が形成されていな
い部位であれば、両密封端面によるシール機能を損なわ
ない限りにおいて任意である。また、深さの異なる凹部
により複数種の摩耗検知用表示を形成しておく場合、凹
部相互間における深さの差は同一であってもなくても、
何れでもよく、必要に応じて任意に設定できる。As described above, according to the present invention, as long as the dynamic pressure generating groove is used to generate the dynamic pressure between the both sealing end surfaces 3a and 6a, the dynamic pressure generating groove may be formed in any shape, number, arrangement and the like. The same can be applied to the non-contact type mechanical seal as in the above embodiment. In addition, it is preferable to engrave a plurality of types of wear detection indicators, which are composed of linear or dot-shaped recesses having different depths, as described above, on the sealed end surface where the dynamic pressure generating groove is formed. It is also possible to engrave only a kind of wear detection display which is composed of a recess having a constant depth. Further, as described above, the wear detection display can be arbitrarily selected from numbers, letters, symbols, figures, and combinations thereof. For example, on the sealed end face where the dynamic pressure generating groove is formed, the size of the seal ring having the sealed end face is engraved by the recesses having different depths or the recesses having a constant depth, and this is used as a wear detection indicator. It is also possible to do so. In this way, in addition to the above-described merit during maintenance and inspection, there is an advantage that it is possible to prevent a mistake in handling such as an erroneous selection of the sealing ring during assembly of the mechanical seal. Further, the place where the wear detection display is engraved is not limited to only the land portion 6a described above, and may be any place as long as the dynamic pressure generating groove is not formed as long as the sealing function by both sealing end faces is not impaired. Is. Further, when a plurality of types of wear detection displays are formed by the recesses having different depths, the difference in depth between the recesses may or may not be the same.
Any of these may be used and can be arbitrarily set as required.
【００２７】[0027]
【発明の効果】以上の説明からも明らかなように、本発
明によれば、動圧発生溝の摩耗程度を目視により容易に
判定することができ、保守点検作業を効率良く行い得
て、長期に亘って良好なシール性能を維持させることが
できる。As is apparent from the above description, according to the present invention, the degree of wear of the dynamic pressure generating groove can be easily determined visually, and maintenance and inspection work can be efficiently performed for a long period of time. A good sealing performance can be maintained over the entire range.
【図１】本発明に係る非接触形メカニカルシールの一実
施例を示す半截断面図である。FIG. 1 is a half sectional view showing an embodiment of a non-contact type mechanical seal according to the present invention.
【図２】動圧発生溝及び摩耗検知用表示が形成された密
封端面の一部切欠正面図である。FIG. 2 is a partially cutaway front view of a sealed end face on which a dynamic pressure generation groove and a wear detection display are formed.
【図３】図２のIII−III線に沿う要部の断面図である。FIG. 3 is a sectional view of a main part taken along the line III-III in FIG.
【図４】動圧発生溝及び摩耗検知用表示が形成された密
封端面の変形例を示す一部切欠正面図である。FIG. 4 is a partially cutaway front view showing a modified example of a sealed end face on which a dynamic pressure generation groove and a wear detection display are formed.
【図５】動圧発生溝及び摩耗検知用表示が形成された密
封端面の更なる変形例を示す一部切欠正面図である。FIG. 5 is a partially cutaway front view showing a further modified example of the sealed end face on which the dynamic pressure generation groove and the wear detection display are formed.
【図６】図５のVI−VI線に沿う要部の断面図である。6 is a cross-sectional view of the main part taken along the line VI-VI of FIG.
【図７】動圧発生溝及び摩耗検知用表示が形成された密
封端面の更なる変形例を示す一部切欠正面図である。FIG. 7 is a partially cutaway front view showing a further modified example of the sealed end surface on which the dynamic pressure generation groove and the wear detection display are formed.
１…ケーシング、２…回転軸、３…静止密封環、３ａ…
静止側密封端面、６…回転密封環、６ａ…回転側密封端
面、６ｂ…ランド部（動圧発生溝が形成されていない部
位）、８1 ，８2 ，８ａ…動圧発生溝、９1 ，９2 ，９
3 ，１９1 ，１９2 ，１９3 ，２９1 ，２９2 ，３
９1 ，３９2 ，３９3 …摩耗検知用表示、ｄ…動圧発生
溝の深さ、ｄ1 ，ｄ2 ，ｄ3 …摩耗検知用表示を構成す
る凹部の深さ。1 ... Casing 2 ... Rotating shaft 3 ... Stationary sealing ring 3a ...
Stationary side sealing end surface, 6 ... Rotating sealing ring, 6a ... Rotating side sealing end surface, 6b ... Land portion (portion where dynamic pressure generating groove is not formed), 8 1 , 8 2 , 8a ... Dynamic pressure generating groove, 9 1 , 9 2 , 9
3 , 19 1 , 19 2 , 19 3 , 29 1 , 29 2 , 3
9 1 , 39 2 , 39 3 ... Wear detection display, d ... Dynamic pressure generating groove depth, d 1 , d 2 , d 3 ... Depth of recess forming wear detection display.
Claims (2)
両密封端面間に一方の密封端面に形成した動圧発生溝に
より動圧を発生させることにより、非接触の近接状態で
相対回転せしめられるように構成された非接触形メカニ
カルシールにおいて、前記一方の密封端面における動圧
発生溝が形成されていない部位に、動圧発生溝より浅い
線状又は点状の凹部で構成される摩耗検知用表示を刻設
してあることを特徴とする非接触形メカニカルシール。1. The rotating side sealing end surface and the stationary side sealing end surface are:
In a non-contact type mechanical seal configured to be relatively rotated in a non-contact close state by generating a dynamic pressure by a dynamic pressure generating groove formed on one sealing end face between both sealing end faces, A non-contact type in which a wear detection indicator composed of a linear or dot-shaped recess shallower than the dynamic pressure generating groove is engraved in a portion of the sealed end surface where the dynamic pressure generating groove is not formed. mechanical seal.
されていない部位に、深さを異にする複数種の摩耗検知
用表示を刻設してあることを特徴とする、請求項１に記
載する非接触形メカニカルシール。2. A plurality of types of wear detection indications having different depths are engraved on a portion of the sealed end surface where the dynamic pressure generating groove is not formed. Non-contact mechanical seal to be described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6303298A JP2700865B2 (en) | 1994-12-07 | 1994-12-07 | Non-contact type mechanical seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6303298A JP2700865B2 (en) | 1994-12-07 | 1994-12-07 | Non-contact type mechanical seal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08159295A true JPH08159295A (en) | 1996-06-21 |
| JP2700865B2 JP2700865B2 (en) | 1998-01-21 |
Family
ID=17919277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6303298A Expired - Lifetime JP2700865B2 (en) | 1994-12-07 | 1994-12-07 | Non-contact type mechanical seal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2700865B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008539378A (en) * | 2005-04-29 | 2008-11-13 | パーキンエルマー，インコーポレーティッド | Magnetic fluid seal |
| JP2010526565A (en) * | 2007-05-03 | 2010-08-05 | アライン テクノロジー， インコーポレイテッド | Dental instrument wear indication and release agent container |
| WO2011115073A1 (en) * | 2010-03-15 | 2011-09-22 | イーグル工業株式会社 | Sliding member |
| CN103765060A (en) * | 2011-09-10 | 2014-04-30 | 伊格尔工业股份有限公司 | Sliding component |
| CN103857919A (en) * | 2011-10-07 | 2014-06-11 | 涡轮梅坎公司 | Centrifugal compressor provided with a marker for measuring wear and a method of monitoring wear using said marker |
| WO2016167262A1 (en) * | 2015-04-15 | 2016-10-20 | イーグル工業株式会社 | Sliding parts |
| JP2017075662A (en) * | 2015-10-16 | 2017-04-20 | 株式会社リケン | Seal ring |
| CN113439167A (en) * | 2019-02-04 | 2021-09-24 | 伊格尔工业股份有限公司 | Sliding component |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0255632U (en) * | 1988-10-18 | 1990-04-23 | ||
| JPH04296259A (en) * | 1991-03-25 | 1992-10-20 | Nippon Pillar Packing Co Ltd | Noncontact sealing device |
-
1994
- 1994-12-07 JP JP6303298A patent/JP2700865B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0255632U (en) * | 1988-10-18 | 1990-04-23 | ||
| JPH04296259A (en) * | 1991-03-25 | 1992-10-20 | Nippon Pillar Packing Co Ltd | Noncontact sealing device |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008539378A (en) * | 2005-04-29 | 2008-11-13 | パーキンエルマー，インコーポレーティッド | Magnetic fluid seal |
| JP2010526565A (en) * | 2007-05-03 | 2010-08-05 | アライン テクノロジー， インコーポレイテッド | Dental instrument wear indication and release agent container |
| JP5758378B2 (en) * | 2010-03-15 | 2015-08-05 | イーグル工業株式会社 | Sliding member |
| US9228660B2 (en) | 2010-03-15 | 2016-01-05 | Eagle Industry Co., Ltd. | Sliding member |
| JPWO2011115073A1 (en) * | 2010-03-15 | 2013-06-27 | イーグル工業株式会社 | Sliding member |
| CN102713376A (en) * | 2010-03-15 | 2012-10-03 | 伊格尔工业股份有限公司 | Sliding member |
| WO2011115073A1 (en) * | 2010-03-15 | 2011-09-22 | イーグル工業株式会社 | Sliding member |
| CN102713376B (en) * | 2010-03-15 | 2015-09-09 | 伊格尔工业股份有限公司 | Slider |
| CN103765060A (en) * | 2011-09-10 | 2014-04-30 | 伊格尔工业股份有限公司 | Sliding component |
| CN103765060B (en) * | 2011-09-10 | 2017-02-15 | 伊格尔工业股份有限公司 | Sliding component |
| US9151390B2 (en) | 2011-09-10 | 2015-10-06 | Eagle Industry Co., Ltd. | Sliding parts |
| KR20140089515A (en) * | 2011-10-07 | 2014-07-15 | 터보메카 | Centrifugal compressor provided with a marker for measuring wear and a method of monitoring wear using said marker |
| CN103857919A (en) * | 2011-10-07 | 2014-06-11 | 涡轮梅坎公司 | Centrifugal compressor provided with a marker for measuring wear and a method of monitoring wear using said marker |
| WO2016167262A1 (en) * | 2015-04-15 | 2016-10-20 | イーグル工業株式会社 | Sliding parts |
| EP3284981A4 (en) * | 2015-04-15 | 2019-03-20 | Eagle Industry Co., Ltd. | Sliding parts |
| US10704417B2 (en) | 2015-04-15 | 2020-07-07 | Eagle Industry Co., Ltd. | Sliding component having fluid introduction groove and dynamic pressure generation groove |
| JP2017075662A (en) * | 2015-10-16 | 2017-04-20 | 株式会社リケン | Seal ring |
| EP3364078A4 (en) * | 2015-10-16 | 2019-02-27 | Kabushiki Kaisha Riken | Seal ring |
| CN113439167A (en) * | 2019-02-04 | 2021-09-24 | 伊格尔工业股份有限公司 | Sliding component |
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| Publication number | Publication date |
|---|---|
| JP2700865B2 (en) | 1998-01-21 |
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