JPH0627549B2 - mechanical seal - Google Patents
mechanical sealInfo
- Publication number
- JPH0627549B2 JPH0627549B2 JP63331550A JP33155088A JPH0627549B2 JP H0627549 B2 JPH0627549 B2 JP H0627549B2 JP 63331550 A JP63331550 A JP 63331550A JP 33155088 A JP33155088 A JP 33155088A JP H0627549 B2 JPH0627549 B2 JP H0627549B2
- Authority
- JP
- Japan
- Prior art keywords
- wear
- sensor
- mechanical seal
- ring
- resistor
- 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.)
- Expired - Lifetime
Links
- 238000007789 sealing Methods 0.000 claims description 42
- 239000004020 conductor Substances 0.000 description 11
- 239000012530 fluid Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical group [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 229940110387 zensa Drugs 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3492—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member with monitoring or measuring means associated with the seal
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Sealing (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ この発明は、ポンプ、コンプレッサ及び攪拌機等の、液
体を密封した回転機械に用いられるメカニカルシールに
関し、特に摺動部（密封端部）の摩耗状態を検知するこ
とができるメカニカルシールに関する。Description: TECHNICAL FIELD The present invention relates to a mechanical seal used in a rotary machine that seals a liquid such as a pump, a compressor and an agitator, and particularly wear of a sliding portion (sealing end portion). The present invention relates to a mechanical seal capable of detecting a state.
＜従来の技術と発明が解決しようとする課題＞ 周知のように、メカニカルシールは、ケーシングに取付
けた静止側密封環の密封端部に、回転軸と一体回転する
回転側密封環の密封端部を密接させることにより、密封
流体の洩れを防止するものである。<Prior Art and Problems to be Solved by the Invention> As is well known, a mechanical seal has a sealing end portion of a stationary side sealing ring attached to a casing and a sealing end portion of a rotating side sealing ring that rotates integrally with a rotating shaft. This is to prevent the leak of the sealed fluid by closely contacting.
一般に、上記メカニカルシールにおいては、上記静止側
密封環及び回転側密封環のうちの何れか一方が、他方側
へ移動可能に設けられていると共に、上記一方が弾性部
材によって他方側へ弾性的に押圧されている。したがっ
て、密封端部が摩耗しても、上記一方の密封環が他方側
へ自動的に送り込まれて上記密着状態が保持されること
になり、これにより、長期に亘ってメンテナンスを行わ
ずに済むことになる。そして、上記密封端部が所定量摩
耗して使用限界に達した場合には、当該使用限界に達し
た密封環を、新しいものと交換している。Generally, in the mechanical seal, one of the stationary side seal ring and the rotary side seal ring is provided so as to be movable to the other side, and the one side is elastically moved to the other side by an elastic member. Pressed. Therefore, even if the sealed end portion is worn, the one sealing ring is automatically sent to the other side to maintain the close contact state, thereby eliminating maintenance for a long period of time. It will be. When the sealed end portion wears out by a predetermined amount and reaches the usage limit, the sealing ring that has reached the usage limit is replaced with a new one.
上記密封環の使用限界は、メカニカルシールを分解して
密封端部の摩耗量を測定することにより把握しているの
が通例である。したがって、使用限界を把握するのに手
間がかかるという問題があるほか、分解作業中、機械を
停止しておかなければならず機械の稼動率を低下させる
という問題があった。It is customary to grasp the use limit of the sealing ring by disassembling the mechanical seal and measuring the amount of wear of the sealed end. Therefore, in addition to the problem that it takes time to grasp the usage limit, there is a problem that the machine must be stopped during the disassembling work and the operation rate of the machine is reduced.
このため、可動側密封環の背面側に設けられている固定
リテーナに、うず電流型変位センサや静電容量型変位セ
ンサ等のギャップセンサを取付け、可動側密封環の背面
をターゲットとして、上記背面とギャップセンサのセン
サ端子部との距離を測定することにより、可動側密封環
の摩耗による移動量を検知し、摩耗量を検出することが
検討されている。For this reason, a gap sensor such as an eddy current type displacement sensor or a capacitance type displacement sensor is attached to the fixed retainer provided on the back side of the movable side sealing ring, and the back side of the movable side sealing ring is used as a target, and It has been considered to detect the amount of wear by detecting the amount of movement of the movable-side sealing ring due to wear by measuring the distance between the gap and the sensor terminal of the gap sensor.
しかし、メカニカールシール毎に固定リテーナと可動側
密封環との間の距離がばらつくので、上記ギャップセン
サ方式では、ギャップセンサのセンサ端子部と可動側密
封環との間の初期隙間の調整や、測定器の調整に手間が
かかるという問題がある。また、上記可動側密封環が密
封流体の内圧により推力を受けて微小移動し、上記隙間
が変動するため、正確な測定を行えないという問題があ
る。さらに、上記隙間に溜まったごみや埃等によって、
作動不良が発生する虞がある。However, since the distance between the fixed retainer and the movable side seal ring varies for each mechanical seal, in the above gap sensor method, adjustment of the initial gap between the sensor terminal portion of the gap sensor and the movable side seal ring, There is a problem that it takes time to adjust the measuring device. Further, the movable side seal ring receives a thrust force by the internal pressure of the sealing fluid and minutely moves to change the gap, which causes a problem that accurate measurement cannot be performed. Furthermore, due to dust and dirt accumulated in the above gap,
There is a risk of malfunction.
この発明の目的は、簡単に且つ確実に密封環の摩耗状態
を検出することのできるメカニカルシールを提供するこ
とである。An object of the present invention is to provide a mechanical seal capable of easily and surely detecting the wear state of the sealing ring.
＜課題を解決するための手段＞ 上記目的を達成するためのこの発明に係るメカニカルシ
ールは、静止側密封環及び回転側密封環のそれぞれの密
封端部どうしを密接させてなるメカニカルシールにおい
て、上記静止側密封環に、その密封端部と共に摩耗可能
であって摩耗に伴う電気的特性の変化により当該密封端
部の摩耗状態を検知するセンサを設けたことを特徴とす
るものである。<Means for Solving the Problem> A mechanical seal according to the present invention for achieving the above object is a mechanical seal in which respective sealing ends of a stationary side sealing ring and a rotating side sealing ring are brought into close contact with each other. The stationary-side sealing ring is provided with a sensor that can be worn together with the sealing end and that detects a wear state of the sealing end by a change in electrical characteristics due to the wear.
なお、上記センサは、抵抗体の摩耗による抵抗値の変化
に基づいて摩耗状態を検知する摩耗センサであっても良
い。The sensor may be a wear sensor that detects a wear state based on a change in resistance value due to wear of the resistor.
また、上記センサは、密封端部と共に摩耗して断線する
導線であっても良い。Further, the sensor may be a conductive wire that is worn and broken together with the sealed end.
＜作用＞ 上記の構成のメカニカルシールによれば、静止側密封環
の密封端部が摩耗すると、当該密封端部と共にセンサが
摩耗するので、この摩耗に伴う電気的な特性の変化を検
知することにより、密封端部の摩耗状態を検知すること
ができる。特に、密封流体が漏れ出す前の正常状態か
ら、密封端部の摩耗状態を検知することができ、また、
運転初期から継続的に摩耗状態を監視することも可能と
なる。より具体的には、上記センサが、抵抗体を用いた
摩耗センサである場合には、この摩耗センサにより、密
封端部と共に摩耗した抵抗体の抵抗値変化に基づいて、
摩耗状態をリアルタイムに検知することができる。ま
た、上記ゼンサが、密封端部と共に摩耗して断線する導
線である場合には、当該センサである導線の断線を、例
えば導線の電気的導通の有無に基づいて検知することに
より、静止側密封環の摩耗限度の摩耗状態を検知するこ
とができる。<Operation> According to the mechanical seal configured as described above, when the sealing end of the stationary seal ring wears, the sensor wears together with the sealing end. Therefore, it is necessary to detect a change in electrical characteristics due to this wear. Thus, the wear state of the sealed end can be detected. In particular, the wear state of the sealed end can be detected from the normal state before the sealing fluid leaks out, and
It is also possible to continuously monitor the wear state from the initial stage of operation. More specifically, when the sensor is a wear sensor using a resistor, this wear sensor, based on the resistance value change of the resistor worn with the sealed end,
The wear state can be detected in real time. Further, in the case where the above-mentioned zensa is a conductor wire that is worn out and breaks together with the sealing end, the stationary side seal is detected by detecting the disconnection of the conductor wire which is the sensor, for example, based on the presence or absence of electrical continuity of the conductor wire. The wear state of the wear limit of the ring can be detected.
＜実施例＞ 以下実施例を示す添付図面によって詳細に説明する。<Examples> Detailed description will be given below with reference to the accompanying drawings showing examples.
第１図はこの発明に係るメカニカルシールを配設した軸
封部分の断面図を示している。同図において、ポンプ等
の回転機械の回転軸(3)は、ケーシング(1)の開口端に設
けられたフランジ(2)の中心孔(21)を通して、ケーシン
グ(1)の内部から外部に導出されており、上記ケーシン
グ(1)の内部からフランジ(2)の中心孔(21)にかけて、メ
カニカルシール(A)が配設されている。このメカニカル
シール(A)は、フランジ(2)に取付けられた静止側密封環
(4)と、回転軸(3)に一体回転可能に取付けられ、上記静
止側密封環(4)の密封端部(41)と摺接する密接端部(51)
を有する回転側密封環(5)とを主要部としている。FIG. 1 is a sectional view of a shaft-sealing portion provided with a mechanical seal according to the present invention. In the figure, the rotary shaft (3) of a rotary machine such as a pump is led from the inside of the casing (1) to the outside through a center hole (21) of a flange (2) provided at the open end of the casing (1). The mechanical seal (A) is arranged from the inside of the casing (1) to the center hole (21) of the flange (2). This mechanical seal (A) is a stationary seal ring attached to the flange (2).
(4) and a close end portion (51) slidably attached to the rotary shaft (3) and in sliding contact with the sealing end portion (41) of the stationary side seal ring (4).
The main part is a rotating side seal ring (5) having
上記静止側密封環(4)は、フランジ(2)の中心孔(21)に内
嵌されており、その内周部(42)と回転軸(3)との間に
は、所定の隙間が設けられている。静止側密封環(4)の
外周には、凸部(43)が全周に亘って形成されている。こ
の凸部(43)は、フランジ(2)の内周段部(22)と組み合わ
されており、両者によってＯリング収容部(6)が形成さ
れている。このＯリング収容部(6)に、静止側密封環(4)
の外周側からの流体の洩れを阻止するＯリング(61)が配
設されている。The stationary side seal ring (4) is fitted in the center hole (21) of the flange (2), and there is a predetermined gap between the inner peripheral portion (42) and the rotary shaft (3). It is provided. A convex portion (43) is formed on the entire outer circumference of the stationary side seal ring (4). The convex portion (43) is combined with the inner peripheral stepped portion (22) of the flange (2), and the O-ring accommodating portion (6) is formed by the both. The O-ring accommodating portion (6) has a stationary side sealing ring (4).
An O-ring (61) is arranged to prevent fluid from leaking from the outer peripheral side.
上記静止側摺動環(4)には、軸方向に貫通するセンサ挿
通孔(44)が形成されており、このセンサ挿通孔(44)に摩
耗センサ(7)が内嵌されている。当該摩耗センサ(7)は、
その先端部(7a)が静止側摺動環(4)の密封環部(41)と面
一になるように配設されている。この先端部(7a)は、密
封端部(41)の摩耗と共に摩耗する。A sensor insertion hole (44) penetrating in the axial direction is formed in the stationary side slide ring (4), and a wear sensor (7) is fitted in the sensor insertion hole (44). The wear sensor (7) is
The tip portion (7a) is arranged so as to be flush with the sealing ring portion (41) of the stationary slide ring (4). The tip portion (7a) is worn along with the wear of the sealed end portion (41).
上記回転側密封環(5)は、軸方向の移動自在なリテーナ
(8)の凹部(81)に嵌合された状態で、当該リテーナ(8)に
よって保持されている。このリテーナ(8)の背部(82)
は、スプリングテーナ(10)に保持されたスプリング(9)
によって静止側密封環(4)方向へ弾性付勢されており、
これにより、上記回転側密封環(5)の密封端部(51)は、
静止側密封環(4)の密封端部(41)に密接されている。The rotating side sealing ring (5) is a retainer that is movable in the axial direction.
It is retained by the retainer (8) while being fitted in the recess (81) of (8). The back (82) of this retainer (8)
Is a spring (9) held by a spring retainer (10)
Is elastically urged toward the stationary seal ring (4) by
Thereby, the sealing end portion (51) of the rotating side sealing ring (5) is
It is in close contact with the sealing end (41) of the stationary sealing ring (4).
上記静止側密封環(4)及び回転側密封環(5)の材質として
は、カーボンとセラミックス、カーボンと超硬合金、等
の組み合わせを例示することができる。Examples of the material of the stationary side seal ring (4) and the rotating side seal ring (5) include combinations of carbon and ceramics, carbon and cemented carbide, and the like.
第２図は、上記摩耗センサ(7)の内部構造を示してお
り、同図において、摩耗センサ(7)は、センサ本体(70)
及びケーブル(71)からなる。上記センサ本体(70)は、円
柱形の保護体(72)の中心部に、セラミックス製の基板(7
3)、該基板(73)に蒸着形成された薄膜状の抵抗体(74)、
この抵抗体(74)に接続した金の薄膜からなる一対の導体
(75)、及び薄膜の温度補償抵抗(76)を内装している。上
記保護体(72)としては、静止側密封環(4)と同材質のも
のを用いることが、当該保護体(72)及び静止側密封環
(4)を等しく摩耗させるために好ましい。この保護体(7
2)によって、抵抗体(74)等を保護することにより、この
摩耗センサ(7)を、例えば温度３００℃、圧力２００kg
／cm2の苛酷な使用環境にも耐えられるようにしてい
る。FIG. 2 shows the internal structure of the wear sensor (7). In the figure, the wear sensor (7) is the sensor body (70).
And a cable (71). In the sensor body (70), a ceramic substrate (7
3), a thin film resistor (74) formed by vapor deposition on the substrate (73),
A pair of conductors consisting of a thin film of gold connected to this resistor (74)
(75), and a thin film temperature compensation resistor (76). As the protective body (72), it is preferable to use the same material as the stationary side sealing ring (4).
Preferred for equal wear of (4). This protector (7
By protecting the resistor (74) etc. with 2), this wear sensor (7) can be used, for example, at a temperature of 300 ° C and a pressure of 200 kg.
It is designed to withstand a harsh usage environment of / cm 2 .
上記ケーブル(72)には、上記一対の導体(75)に接続した
一対のリード線(76)、及び上記温度補償抵抗(76)に接続
したリード線(77)が内装されている。これらのリード線
(76)(77)は、抵抗値を検出する検出器（図示せず）に接
続されている。The cable (72) has a pair of lead wires (76) connected to the pair of conductors (75) and a lead wire (77) connected to the temperature compensation resistor (76). These leads
(76) and (77) are connected to a detector (not shown) that detects a resistance value.
上記抵抗体(74)の摩耗量Ｘは、 Ｌ：抵抗体(74)の初期長さ Ｒ１：抵抗体(74)の初期抵抗値 Ｒ：抵抗体(74)の摩耗後の抵抗値 として、 Ｘ＝Ｌ−Ｌ・Ｒ１／Ｒ で表される。The wear amount X of the resistor (74) is L: initial length of the resistor (74) R 1 : initial resistance value of the resistor (74) R: resistance value of the resistor (74) after wear, It is represented by X = L−L · R 1 / R.
上記検出器には、温度補償抵抗(76)をリード線(77)を介
して接続した温度補償回路、及びリード線(76)(77)の抵
抗値を校正するための回路が内装されている。上記温度
補償回路は、抵抗体(74)の抵抗値の温度変化による変動
分を温度補償するためのものである。The detector has a temperature compensation circuit in which a temperature compensation resistor (76) is connected via a lead wire (77), and a circuit for calibrating the resistance value of the lead wires (76) (77). . The temperature compensating circuit is for compensating the variation of the resistance value of the resistor (74) due to the temperature change.
この実施例の構成によれば、静止側密封環(4)の密封端
部(41)が摩耗すると、当該密封端部(41)と共に摩耗セン
サ(7)の抵抗体(74)が摩耗し、抵抗体(74)の抵抗値が変
化（増大）する。この抵抗体(74)の抵抗値の変化に基づ
き、摩耗センサ(7)によって、密封端部(41)の摩耗状態
を検知することができる。したがって、上記検知に際
し、メカニカルシール(A)を分解する必要がなく、しか
も摩耗センサ(7)自体が摩耗して直接的に摩耗状態を検
知するので、容易に且つ確実に摩耗状態を検知すること
ができる。しかも、密封流体が漏れ出す前の正常状態か
ら、上記摩耗状態を検知することができ、また、上記摩
耗状態を継続的に監視することもできる。そして、予め
使用限界に対応する抵抗値を求めておくことにより、静
止側密封環(4)の使用限界を把握することができる。According to the configuration of this embodiment, when the seal end (41) of the stationary side seal ring (4) is worn, the resistor (74) of the wear sensor (7) is worn together with the seal end (41), The resistance value of the resistor (74) changes (increases). The wear state of the sealed end portion (41) can be detected by the wear sensor (7) based on the change in the resistance value of the resistor (74). Therefore, in the above detection, it is not necessary to disassemble the mechanical seal (A), and since the wear sensor (7) itself wears and the wear state is directly detected, it is possible to easily and surely detect the wear state. You can Moreover, the wear state can be detected from the normal state before the leak of the sealed fluid, and the wear state can be continuously monitored. Then, by obtaining the resistance value corresponding to the use limit in advance, the use limit of the stationary side seal ring (4) can be grasped.
また、この摩耗センサ(7)が、温度補償抵抗(76)を有す
るので、この温度補償抵抗(76)の温度変化による抵抗値
変化に基づいて、温度変化による抵抗値の変動分を補正
した状態で、上記抵抗体(74)の摩耗による抵抗値変化を
検知することができ、一層正確に摩耗状態の検知が行え
る。Further, since this wear sensor (7) has the temperature compensation resistance (76), the resistance value variation due to temperature change is corrected based on the resistance variation due to temperature change of the temperature compensation resistance (76). Thus, a change in resistance value due to wear of the resistor (74) can be detected, and the wear state can be detected more accurately.
なお、摩耗センサ(7)は、第３図に示すように、静止側
摺動環(4)の内周部(42)に設けたセンサ配設溝(45)に、
接着剤により貼着しておいても良い。As shown in FIG. 3, the wear sensor (7) has a sensor mounting groove (45) provided in the inner peripheral portion (42) of the stationary side sliding ring (4),
It may be pasted with an adhesive.
第４図は他の実施例を示している。同図において、静止
側密封環(4)にセンサとしてのループ状の導線(7′)が埋
設されている。この導線(7′)は、静止側密封環(4)の密
封端部(41)が使用限界または使用限界近くまで摩耗する
と、露出して摩耗し、断線するようになっている。そし
て、上記導線(7′)には、電気的導通の有無に基づいて
上記断線を検知する導線検知手段(11)が接続されてい
る。FIG. 4 shows another embodiment. In the figure, a loop-shaped conducting wire (7 ') as a sensor is embedded in the stationary side seal ring (4). This conductor wire (7 ') is exposed and abraded when the sealing end portion (41) of the stationary side seal ring (4) is worn to the limit of use or close to the limit of use, and is broken. The conductor wire (7 ') is connected to a conductor wire detection means (11) for detecting the wire breakage based on the presence or absence of electrical conduction.
この実施例によれば、導通検知手段(11)による断線検知
によって、静止側密封環(4)が使用限界または使用限界
近くに達したことを容易に且つ確実に検知することがで
き、これにより、静止側密封環(4)の使用限界を把握す
ることができる。特に、センサが導線(7′)からなる非
常に単純な構成なので、温度の影響も無視でき、動作が
一層確実である。According to this embodiment, the disconnection detection by the continuity detection means (11) makes it possible to easily and reliably detect that the stationary side seal ring (4) has reached or near the usage limit. It is possible to grasp the usage limit of the stationary side seal ring (4). In particular, since the sensor has a very simple structure consisting of the conductive wire (7 '), the influence of temperature can be ignored and the operation is more reliable.
なお、この考案のメカニカルシールは、上記各実施例に
限定されるものでなく、例えば、摩耗センサとして、段
階的に長さの異なる抵抗箔と複数本保護体内に埋設した
ものを用い、摩耗と共に段階的に変化する抵抗値に基づ
いて、摩耗状態を検知するようにすること等、この発明
の要旨を変更しない範囲で種々の設計変更を施すことが
できる。The mechanical seal of the present invention is not limited to the above-mentioned embodiments.For example, as a wear sensor, a resistance foil having a stepwise different length and a plurality of resistance foils embedded in a protective body are used. Various design changes can be made within a range that does not change the gist of the present invention, such as detecting the wear state based on the resistance value that changes stepwise.
＜発明の効果＞ 以上のように、この発明のメカニカルシールによれば、
静止側密封環の密封端部の摩耗と共に摩耗するセンサに
よって、摩耗に伴う電気的特性の変化により密封端部の
摩耗を検知するので、メカニカルシールを分解すること
なく、密封端部の摩耗状態を容易に且つ確実に検知する
ことができる。特に密封流体が漏れ出す前に密封端部の
摩耗状態を検知することができ、また、運転初期からの
摩耗状態を継続的に監視することも可能となる。<Effects of the Invention> As described above, according to the mechanical seal of the present invention,
A sensor that wears with the wear of the seal end of the stationary side seal ring detects wear of the seal end due to changes in electrical characteristics due to wear, so the wear state of the seal end can be determined without disassembling the mechanical seal. It can be detected easily and surely. In particular, the wear state of the sealed end can be detected before the sealing fluid leaks out, and the wear state from the initial stage of operation can be continuously monitored.
また、上記センサが、抵抗体を用いた摩耗センサである
場合、この摩耗センサにより、密封端部と共に摩耗した
抵抗体の抵抗値変化に基づいて、摩耗状態を検知するこ
とができる。When the sensor is a wear sensor using a resistor, the wear sensor can detect the wear state based on a change in the resistance value of the resistor worn along with the sealed end.
さらに、上記センサが、密封端部と共に摩耗して断線す
る導線である場合、当該センサである導線の断線を、例
えば導線の電気的導通の有無に基づいて検知することに
より、静止側密封環の摩耗状態を検知することができ、
しかも、センサを単純な構成としているので、検知を一
層確実に行わせることができる。Further, when the sensor is a conductor wire that is worn and breaks together with the sealed end, the sensor wire breakage is detected, for example, based on the presence or absence of electrical continuity of the conductor wire, and Wear state can be detected,
Moreover, since the sensor has a simple structure, the detection can be performed more reliably.
第１図はこの発明のメカニカルシールを包含した軸封部
分の断面図、 第２図はその摩耗センサの内部構造を示す断面図、 第３図は摩耗センサを静止側密封環の内周部に配置した
例を示す断面図、 第４図は他の実施例の静止側密封環を示す断面図であ
る。 (A)……メカニカルシール、(4)……静止側密封環、(5)
……回転側密封環、(7)……摩耗センサ、 (7′)……センサとしての導線、 (41)(51)……密封端部、(74)……抵抗体。FIG. 1 is a sectional view of a shaft sealing portion including a mechanical seal of the present invention, FIG. 2 is a sectional view showing an internal structure of the wear sensor, and FIG. 3 is a wear sensor at an inner peripheral portion of a stationary side seal ring. FIG. 4 is a cross-sectional view showing an arranged example, and FIG. 4 is a cross-sectional view showing a stationary side seal ring of another embodiment. (A) …… Mechanical seal, (4) …… Stationary side sealing ring, (5)
...... Rotation side seal ring, (7) ...... Wear sensor, (7 ') ...... Conductor wire as sensor, (41) (51) ...... Seal end, (74) ...... Resistor.
Claims (3)
の密封端部どうしを密接させてなるメカニカルシールに
おいて、上記静止側密封環に、その密封端部と共に摩耗
可能であって摩耗に伴う電気的特性の変化により当該密
封端部の摩耗状態を検知するセンサを設けたことを特徴
とするメカニカルシール。1. A mechanical seal in which the respective sealing ends of a stationary side sealing ring and a rotating side sealing ring are in close contact with each other, wherein the stationary side sealing ring can be worn together with the sealing ends, and is accompanied by wear. A mechanical seal provided with a sensor for detecting a wear state of the sealed end portion according to a change in electrical characteristics.
の変化に基づいて摩耗状態を検知する摩耗センサである
上記請求項第１項記載のメカニカルシール。2. The mechanical seal according to claim 1, wherein the sensor is a wear sensor that detects a wear state based on a change in resistance value due to wear of the resistor.
線する導線である上記請求項第１項記載のメカニカルシ
ール。3. The mechanical seal according to claim 1, wherein the sensor is a conductive wire that is worn and broken together with the sealed end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63331550A JPH0627549B2 (en) | 1988-12-28 | 1988-12-28 | mechanical seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63331550A JPH0627549B2 (en) | 1988-12-28 | 1988-12-28 | mechanical seal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02176270A JPH02176270A (en) | 1990-07-09 |
| JPH0627549B2 true JPH0627549B2 (en) | 1994-04-13 |
Family
ID=18244920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63331550A Expired - Lifetime JPH0627549B2 (en) | 1988-12-28 | 1988-12-28 | mechanical seal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0627549B2 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04327069A (en) * | 1991-04-26 | 1992-11-16 | Hitachi Ltd | Wear amount detection device for shaft sealing device |
| KR100417188B1 (en) * | 2001-09-27 | 2004-02-05 | 주식회사 포스코 | Abrastion volume detection apparatus of air seal bar for sinterring machine car |
| CA2940397C (en) * | 2008-05-21 | 2018-11-20 | John Crane Inc. | Seal monitoring and control system |
| DE102009004035B4 (en) * | 2009-01-08 | 2017-05-11 | Man Diesel & Turbo Se | Monitoring a sealing arrangement, in particular a gas compressor or expander |
| IT201900022563A1 (en) * | 2019-11-29 | 2021-05-29 | Italtractor | Component of operating machine |
| DE102021127019A1 (en) | 2021-10-19 | 2023-04-20 | Eagleburgmann Germany Gmbh & Co. Kg | Slide ring with wear measuring device and mechanical seal arrangement with such a slide ring |
| DE102021127005A1 (en) * | 2021-10-19 | 2023-04-20 | Eagleburgmann Germany Gmbh & Co. Kg | Slide ring with wear measuring device and mechanical seal arrangement with such a slide ring |
| DE102021127008A1 (en) * | 2021-10-19 | 2023-04-20 | Eagleburgmann Germany Gmbh & Co. Kg | Slide ring with wear measuring device and mechanical seal arrangement with such a slide ring |
| DE102021132117B3 (en) | 2021-12-07 | 2023-02-02 | Eagleburgmann Germany Gmbh & Co. Kg | Slide ring of a slide ring seal and method for its production |
| CN115372420B (en) * | 2022-08-28 | 2025-08-19 | 浙江工业大学 | Test system for monitoring abrasion of sealing surface based on resistance change of conductive coating |
| US12352355B2 (en) * | 2022-11-15 | 2025-07-08 | Goodrich Corporation | System and method for monitoring gasket sealing health |
| DE102023103419A1 (en) * | 2023-02-13 | 2024-08-14 | Eagleburgmann Germany Gmbh & Co. Kg | Mechanical seal arrangement |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57204374A (en) * | 1981-06-08 | 1982-12-15 | Hitachi Ltd | Mechanical seal |
-
1988
- 1988-12-28 JP JP63331550A patent/JPH0627549B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02176270A (en) | 1990-07-09 |
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