Seal ring with online monitoring of wear

Abstract

The application provides a sealing ring with online monitoring function of abrasion amount, which comprises a graphite ring, an insulating base layer, a sensitive grid on the outer surface of the insulating base layer, a protective layer on the outer surface of the sensitive grid, the sensitive grid comprises a circumferential sensitive grid arranged along the circumference of the sealing ring and a longitudinal sensitive grid arranged longitudinally, the annular at the bottom of the sensitive grid is a sensitive grid connecting layer, the annular at the bottom of the sensitive grid connecting layer is a PCB substrate, the sensitive grid is a conductive layer, the sensitive grid connecting layer is a metal layer, and the intersection of the circumferential sensitive grid and the longitudinal sensitive grid is a logic node. In the running process of the graphite ring, the end face is abraded, when the abrasion causes the fracture of a certain contact point of the sensitive grid, a logic gate signal is generated, various binary codes are obtained by connecting a circuit outside the PCB substrate, and online monitoring of the abrasion of the mechanical sealing ring is realized. By using information technology, the compensation ring itself becomes a sensing sensitive element, so that the mechanical seal has the ability of online abrasion amount monitoring.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mechanical seal, in particular to a sealing ring with online monitoring function of wear amount. BACKGROUND

[0002] Mechanical seal is usually used to seal high-temperature, toxic and high-pressure process medium. It serves as a barrier between process medium and environment, protecting the environment and people from being threatened. Therefore, the reliability of mechanical seal and its own health degree are self-evident. It is very important to monitor the state of mechanical seal and predict its service life.

[0003] At present, all mechanical seal products in the world do not have the ability of state monitoring by themselves. They are all through the opening or setting of the attached structure on the product, and through the addition of sensors to collect the performance of mechanical seal. There is no method to achieve online monitoring of the wear of the end face of mechanical seal. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to solve the problem and provide a sealing ring with online monitoring function of wear amount.

[0005] In order to achieve the above-mentioned purpose of the application, the technical scheme of the present application is as follows:

[0006] A sealing ring with online monitoring function of wear amount, comprising a graphite ring 1, an insulating base layer 2 on the outer surface of the graphite ring 1, a sensitive grid 3 on the outer surface of the insulating base layer 2, and a protective layer 4 on the outer surface of the sensitive grid 3, the sensitive grid 3 comprising a circumferential sensitive grid 5 arranged along the circumference of the sealing ring and a longitudinal sensitive grid 6 arranged longitudinally, the annular portion at the bottom of the sensitive grid 3 being a sensitive grid connecting layer 7, the annular portion at the bottom of the sensitive grid connecting layer 7 being a PCB substrate 8, the sensitive grid 3 being a conductive layer, the sensitive grid connecting layer 7 being a metal layer, and the intersection of the circumferential sensitive grid 5 and the longitudinal sensitive grid 6 being a logic node 9.

[0007] As a preferred mode, there is wear on the end face of the graphite ring during operation. When the wear causes a certain contact of the sensitive grid 3 to break, the logic state signal is changed, and various binary codes are obtained by connecting the circuit outside the PCB substrate 8 to realize online monitoring of the wear of the mechanical sealing ring.

[0008] As a preferred mode, the preparation method of the sealing ring is as follows: spraying the insulating base layer 2 on the outer layer of the graphite ring 1, spraying the conductive layer as the sensitive grid 3 along the circumference and longitudinally of the sealing ring on the outer layer of the insulating base layer 2, spraying the protective layer 4 on the outer conductive layer, and connecting between the graphite ring and the PCB substrate 8 by welding a metal ring.

[0009] As a preferred mode, the material of the protective layer 4 is polyether ether ketone PEEK or polytetrafluoroethylene PTFE.

[0010] As a preferred mode, the sensitive grid 3 material is selected from copper, gold, silver metal.

[0011] As a preferred mode, the circumferential sensitive grid 5 has a spacing of 0.1 microns to 1 millimeter in the circumferential direction. Preferably, the spacing is 1 micron.

[0012] As a preferred mode, 4-360 longitudinal sensitive grids 6 are evenly distributed in the circumferential direction.

[0013] As a preferred mode, the total thickness of the insulating base layer 2, the sensitive grid 3, and the protective layer 4 is not more than 0.5 mm.

[0014] As a preferred mode, the insulating base layer 2 is a material that is not conductive and can be connected to a conductive metal.

[0015] As a preferred mode, the insulating base layer 2 is quartz.

[0016] The beneficial effects of the present application are: the present application changes the function of the mechanical seal compensation ring. In addition to maintaining the original function of the mechanical seal compensation ring, the compensation ring itself becomes a sensing sensitive element by using information technology, so that the mechanical seal has the ability of online wear monitoring. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present application;

[0018] 1 is a graphite ring, 2 is an insulating base layer, 3 is a sensitive grid, 4 is a protective layer, 5 is a circumferential sensitive grid, 6 is a longitudinal sensitive grid, 7 is a sensitive grid connecting layer, 8 is a PCB substrate, and 9 is a logic node. DETAILED DESCRIPTION

[0019] The embodiments of the present application are described below through specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. The present application can also be implemented or applied in different specific embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application.

[0020] The present embodiment provides a sealing ring with online wear monitoring function, which includes a graphite ring 1, an insulating base layer 2 on the outer surface of the graphite ring 1, a sensitive grid 3 on the outer surface of the insulating base layer 2, and a protective layer 4 on the outer surface of the sensitive grid 3. The sensitive grid 3 includes circumferential sensitive grids 5 arranged along the circumference of the sealing ring and longitudinal sensitive grids 6 arranged longitudinally. The annular portion at the bottom of the sensitive grid 3 is a sensitive grid connecting layer 7, and the annular portion at the bottom of the sensitive grid connecting layer 7 is a PCB substrate 8. The sensitive grid 3 is a conductive layer, the sensitive grid connecting layer 7 is a metal layer, and the intersection of the circumferential sensitive grid 5 and the longitudinal sensitive grid 6 is a logic node 9.

[0021] The graphite ring has end face wear during operation. When the wear breaks a contact of the sensitive grid 3, thus changing the logic state signal, various binary codes are obtained by connecting the circuit outside the PCB substrate 8 to realize online monitoring of the wear of the mechanical seal ring. For example: each horizontal grid is provided with a number, and each vertical grid is provided with a number, so that each node has a number. The Boolean value code formed by measuring the state of all nodes each time is different. With each wear of a node, the code value changes accordingly. The change of the code reflects the state of all nodes, and thus reflects the state of the ring body wear.

[0022] The preparation method of the seal ring is: spraying an insulating base layer 2 on the outer layer of the graphite ring 1, spraying an electrically conductive layer as a sensitive grid 3 along the circumferential direction and the longitudinal direction of the seal ring on the outer layer of the insulating base layer 2, spraying a protective layer 4 on the outer layer of the electrically conductive layer, and connecting between the graphite ring and the PCB substrate 8 by welding a metal ring.

[0023] The material of the protective layer 4 is polyether ether ketone PEEK or polytetrafluoroethylene PTFE.

[0024] The material of the sensitive grid 3 is selected from copper, gold, and silver metal.

[0025] The circumferential sensitive grid 5 has an upper and lower spacing of 0.1 microns to 1 millimeter in the circumferential direction. Therefore, the maximum resolution of the wear detection of the present application can be 1 um.

[0026] 4-360 longitudinal sensitive grids 6 are uniformly distributed in the circumferential direction.

[0027] The thickness sum of the insulating base layer 2, the sensitive grid 3, and the protective layer 4 does not exceed 0.5 mm.

[0028] The insulating base layer 2 is a material that is not conductive and can be connected with conductive metal. Preferably, the insulating base layer 2 is quartz.

[0029] The above examples are only illustrative of the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above examples without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A seal ring having a wear amount on-line monitoring function, characterized by: The sealing ring comprises a graphite ring (1), an insulating base layer (2) on the outer surface of the graphite ring (1), a sensitive grid (3) on the outer surface of the insulating base layer (2), and a protective layer (4) on the outer surface of the sensitive grid (3). The sensitive grid (3) comprises circumferential sensitive grids (5) arranged along the circumference of the sealing ring and longitudinal sensitive grids (6) arranged longitudinally. The bottom of the sensitive grid (3) is a sensitive grid connecting layer (7), and the bottom of the sensitive grid connecting layer (7) is a PCB substrate (8). The sensitive grid (3) is a conductive layer, and the sensitive grid connecting layer (7) is a metal layer. The intersection of the circumferential sensitive grids (5) and the longitudinal sensitive grids (6) is a logic node (9). During the operation of the graphite ring, the end surface is worn. When the wear causes a certain logic node (9) of the sensitive grid (3) to break, the logic state signal is changed, and binary coding is obtained by connecting an external circuit to the PCB substrate (8) to realize online monitoring of the wear of the sealing ring. Each circumferential sensitive grid (5) is provided with a number, and each longitudinal sensitive grid (6) is provided with a number, so that each logic node (9) has a number. The Boolean value code formed by the state of all logic nodes (9) is different each time, and the code value changes accordingly each time a logic node (9) is worn off. The change in the code reflects the state of all logic nodes (9), and thus the state of the sealing ring wear. The preparation method of the sealing ring comprises the following steps: spraying an insulating base layer (2) on the outer layer of the graphite ring (1), spraying a conductive layer as a sensitive grid (3) along the circumference and longitudinally on the outer layer of the insulating base layer (2), spraying a protective layer (4) on the outer layer of the conductive layer, and connecting the graphite ring and the PCB substrate (8) by welding a metal ring. The material of the sensitive grid (3) is selected from copper, gold, or silver. The circumferential sensitive grids (5) have a spacing of 0.1 microns to 1 millimeter between the upper and lower circumferences. 4-360 longitudinal sensitive grids (6) are uniformly distributed in the circumference. The total thickness of the insulating base layer (2), the sensitive grid (3), and the protective layer (4) is not more than 0.5 mm. The insulating base layer (2) is a material that is not conductive and can be connected with a conductive metal.

2. The seal ring with online monitoring of wear function according to claim 1, characterized in that: The material of the protective layer (4) is polyether ether ketone (PEEK) or polytetrafluoroethylene (PTFE).

3. The seal ring with online monitoring of wear function according to claim 1, characterized in that: The insulating base layer (2) is quartz.

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