JP3073958B2 - Monitoring device and method for mechanical seal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical device suitable for detecting abnormalities for detecting the amount of movement of components mounted on a mechanical seal provided in a pump or a stirrer, a shaft runout, abrasion of components, and the like. The present invention relates to a sealing monitoring device and method.

[0002]

2. Description of the Related Art In a conventional mechanical seal, when an abrasion state of a sliding member or the like in a sealed box is detected during operation, an actual open seal is used.
Direct insertion of a fiberscope or a sensor into a sealed box, such as a shaft sealing device described in 3-117163
Was installed. In addition, Japanese Patent Application Laid-Open No.
JP-A-06-241325 discloses that a permanent magnet is
Installed on the outer peripheral surface, the amount of wear in the axial direction is measured by a magnetic sensor
Which detects the above is disclosed.

[0003]

The object of the invention is to be Solved by the real No. 03-1
In the case of Japanese Patent No. 17163 , when a fiberscope or a sensor is directly inserted into a shaft sealing box to detect a wear state of a sliding material, a lubricating liquid is usually sealed in the shaft sealing box. In order to detect the transmission mark provided on the outer circumference of the rotating ring etc. according to the transparency of the liquid, it is necessary to bring the tip of the fiber scope or the sensor close to the transmission mark, and during operation, the transparency changes due to the contamination of the lubricating liquid etc. It is necessary to adjust the position of the tip of the fiberscope or the sensor, and depending on the adjustment, there is a problem in that the tip is too close to come into contact with a rotating ring or the like, thereby damaging the fiberscope or the sensor and leaking the mechanical seal. Also,
Japanese Patent Application Laid-Open No. 06-241325,
Only the field strength is detected, and the life of the sliding member is monitored.
It wasn't something to tally.

An object of the present invention is to provide a monitoring apparatus and method for a mechanical seal which can easily detect the wear of a sliding member of the mechanical seal.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mechanical seal monitoring apparatus and method capable of easily detecting wear of a sliding member of a mechanical seal and estimating the life of the sliding member. It is in.

Another object of the present invention is to prevent the rotating ring or the like from coming into contact with the sensor, not to be affected by the transparency of the lubricating liquid in the shaft sealing box, and to wear the sliding material even during operation without disassembling the shaft sealing device. A mechanical seal monitoring device that can predict the life of a mechanical seal sliding material by grasping the condition etc., measuring shaft runout at the same time, and grasping the wear state of the sliding material etc. To provide.

[0007]

According to the present invention, in order to achieve the above object, a sliding shaft having a rotating shaft and a sliding surface which wears due to surface contact with other members due to rotation of the rotating shaft due to surface contact. For a mechanical seal including a moving member and a magnetic field generating portion that generates a position displacement corresponding to wear of the sliding member, a magnetic field sensor for detecting a magnitude of a magnetic field from the magnetic field generating portion accumulates a rotation time of the rotating shaft. time and obtain a measurement data of at least two points represents the relationship between the detection value of the magnetic field sensor corresponds to the magnitude of the magnetic field detected in the displacement position corresponding to the degree of wear of the tolerance limits of the sliding element acceptable from the limit data and the measurement data, it consists to predict the life of the sliding member.

According to the present invention, in order to achieve the above-mentioned object, magnetism having such a strength that a magnetic force can be detected by a sensor in a non-contact manner with components such as a rotating shaft, a rotating ring, and a fixed ring constituting a mechanical seal is provided. A sensor installed in a shaft box or the like detects a change in magnetic force transmitted from its magnetic field according to a change in the state of the mounted material or permanent magnet, etc., and converts the magnetic force into a digital signal by a converter. It is equipped with a converter and a processing device (PC) to convert, to quantitatively grasp the change in the state of the magnetic field, and to predict the life of the component. On the other hand, a change in magnetic force detected by a sensor due to a change in the state of a component is obtained and processed in advance, and a position adjustment device is provided on the shaft seal box to estimate the life of the component.

A sensor installed in a shaft seal box or the like detects a change in magnetic force generated from a magnetic field attached to components such as a rotating shaft, a rotating ring, and a fixed ring that constitute the mechanical seal. Regardless of the contamination of the lubricating fluid in the shaft sealing box, it is possible to grasp a change in the state of the rotating component.

The life of the mechanical seal can be predicted by disassembling the mechanical seal by data processing of the state change.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
This will be described with reference to FIG.

In FIG. 1, 1 is a sealed container, 2 is a rotating shaft, 3 is a shaft seal, 4 is a fixed seat fixed to a shaft seal box 6, and 5 is a substance or permanent material having a magnet on its outer peripheral surface. A rotating ring on which a magnetic field 7 such as a magnet is mounted, and a magnetic sensor 8 is inserted into a position adjusting device 9 fitted to the outer diameter of the sensor 8 which can be set at a fixed position with respect to the magnetic field 7 provided on the rotating ring 5. And is supported by a shaft seal box 6. The change of the magnetic force generated from the magnetic field 7 detected by the sensor 8 according to the state change of the rotating ring 5 is converted into a digital signal by the converter 10 by the position adjusting device 9 in advance, and the change of the magnetic field is quantitatively grasped. When the contact sliding surface between the fixed seat 3 and the rotating ring 5 is worn by the processing by the data processing device 11, the rotating ring 5 equipped with the magnetic field 7 moves in the axial direction, and the magnetic force detected by the sensor 8 changes. Then, by comparing the value with a value obtained in advance, the rotating ring 5 is obtained.
State change and life expectancy can be predicted.

In the embodiment of the mechanical seal monitoring apparatus shown in FIG. 2, since the fixed seat 3 is displaced upward by the spring 12 due to the wear of the rotating ring 5, the magnetic field 7 is mounted on the outer surface of the fixed seat 3. It is configured to grasp the state change of the sliding surface.

FIG. 3 shows a state in which a magnetic field 7 is mounted at a position where the rotating ring 5 contacts the outer surface of the rotating shaft 2, and the magnetic force detected by the sensor 8 when the rotating ring 5 moves due to wear of the sliding surface. An embodiment of a mechanical seal monitoring device for grasping a change and grasping a change in a state of a sliding surface will be described.

FIG. 4 shows a position adjusting device 9 in which the sensor 8 is inserted and fitted to the outside of the shaft sealing box 6 and the sensor 8 mounting position hole is eccentric with respect to the outer diameter of the fitting portion, and a scale is provided on the shaft sealing box 6. By rotating the position adjusting device 9 according to the scale, the sensor mounting position changes slightly, the position of the sensor and the magnetic field changes, and the position of the member to be measured detected by the sensor can be set in advance. 1 shows an embodiment of a seal monitoring device. This scale indicates that the amount of displacement in the height direction of the sensor 8 that moves with the rotation of the position adjustment device 9 is:
It is attached to the position of the rotation angle that gives this displacement amount.

FIG. 5 shows a position adjusting device 9 in which the sensor 8 is inserted and fitted to the outside of the shaft sealing box 6 and the sensor 8 mounting position hole is formed in a long hole in the direction in which the rotary ring 5 and the like move. An embodiment of a monitoring apparatus for a mechanical seal in which a sensor 8 is moved along, a change in magnetic force detected by the sensor 8 is grasped, and a position of a member to be measured can be set in advance.

FIG. 6 is a graph showing an example of the life expectancy obtained by processing the change in the magnetic force sensed by the sensor with the data taken in by the converter. 7 is a measurement example of the wear amount of the rotating ring 5 that can be determined from the axial movement amount of the rotating ring 5. By plotting the wear amount a at the measurement time of a, the wear amount b at the measurement time of b, or the wear amount c at the measurement time of c, the time of e to reach the set wear limit point d is predicted. You can do it. Note that the limit value of the amount of wear is predetermined.

In the mechanical seal monitoring device as in the above embodiment, a change in the state of a component can be easily grasped without affecting the transparency due to contamination of the lubricating liquid in the shaft sealing box, and the life of the component is predicted. Things are possible.

[0019]

As described above, according to the present invention, a substance having magnetism or a permanent magnet or the like is mounted on components such as a rotating shaft, a rotating ring, and a stationary ring which constitute a mechanical seal, and transmission is performed from a magnetic field. By measuring the change in magnetic force detected by the sensor in advance by a change in the state of the component by means of the position adjusting device, the life of the component can be predicted without disassembling and inspecting the mechanical seal.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a mechanical seal monitoring device according to the present invention.

FIG. 2 is a configuration diagram showing another embodiment of the mechanical seal monitoring device according to the present invention.

FIG. 3 is a configuration diagram showing another embodiment of the mechanical seal monitoring device according to the present invention.

FIG. 4A is a side view illustrating a structural example of a position adjusting device. (B) is a front view of a structural example of the position adjusting device.

FIG. 5A is a side view illustrating a structural example of a position adjusting device. (B) is a front view of a structural example of the position adjusting device.

FIG. 6 is a characteristic diagram showing an example of a graph of data predicting the life of a sliding material.

[Explanation of symbols]

1 ... container, 2 ... rotating shaft, 3 ... fixed ring, 4 ... shaft seal, 5 ...
Rotating ring, 6: shaft box, 7: magnetic field, 8: sensor, 9: position adjusting device, 10: converter, 11: data processing device, 12
... Spring, 13, 14, 15, 16 ... O-ring, 17 ... Spring receiver, 18 ... Rotating ring seat.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshio Ishiyama 794, Higashitoyoi, Katsumatsu-shi, Yamaguchi Prefecture Hitachi Techno Engineering Co., Ltd. well 794 address Hitachi Techno engineering Co., Ltd. Ryutogoto business premises (72) inventor Tadashi Kawamura Yamaguchi Prefecture Kudamatsu Oaza Higashitoyoi address 794 stock company Hitachi Ryuto in the factory (58) investigated the field (Int.Cl. ^7, (DB name) F16J 15/34

Claims (5)

(57) [Claims] 1. A sliding member having a rotating shaft, a sliding surface which is slid by surface contact with another member due to rotation of the rotating shaft and wear is advanced, and a positional displacement corresponding to the wear of the sliding member is generated. A mechanical seal including a magnetic field generating unit, a magnetic field sensor for detecting the magnitude of the magnetic field from the magnetic field generating unit, and a magnitude of the magnetic field detected at a displacement position corresponding to an allowable limit of the degree of wear of the sliding member. and a corresponding allowable limit data and the measurement data of at least two points represents the relationship between the detection value of the cumulative time and the magnetic field sensor of the rotation time of the rotary shaft, and a data processing apparatus for predicting the life of the sliding member A monitoring device for a mechanical seal, comprising: 2. The mechanical seal monitoring device according to claim 1, wherein a change in a magnetic field detected by a sensor due to a change in the state of the sliding member is grasped in advance. A monitoring device for mechanical seals, characterized in that the position adjustment device installed on the machine is provided with scales. 3. The monitoring device for a mechanical seal according to claim 1, further comprising a converter that converts a detection value of the magnetic field sensor into a digital signal and supplies the digital signal to the data processing device. Monitoring device for sealing. 4. A mechanical seal for monitoring device according to claim 1 or 2, wherein in that said data processing apparatus comprising a document creation processing unit for creating the article, such as a graph predicting life date of the sliding member Features a monitoring device for mechanical seals. 5. A sliding member having a rotating shaft, a sliding surface which is slid by surface contact with another member due to rotation of the rotating shaft and wear is advanced, and a positional displacement corresponding to the wear of the sliding member is generated. to mechanical seal including a magnetic field generating unit, at least represents the relationship between the detection value of the cumulative time and the magnetic field sensor of the rotation time of the rotating shaft by a magnetic field sensor for detecting the magnitude of the magnetic field from the magnetic field generator 2 Obtain point measurement data, and from the permissible limit data corresponding to the magnitude of the magnetic field detected at the displacement position corresponding to the permissible limit of wear of the sliding member and the measured data, determine the life of the sliding member. A monitoring method for mechanical seals characterized by predicting.