Online monitoring device and method for abrasion loss of floating static ring type mechanical seal

Abstract

The invention relates to the field of mechanical maintenance, in particular to a floating static ring type mechanical seal abrasion loss online monitoring device and method. The device is characterized in that an axial displacement measurement positioning plate is mounted on a stationary ring seat of the floating stationary ring type mechanical seal; a probe fixing bracket is arranged on the mechanical sealing end cover; an axial displacement monitoring probe is mounted on the probe fixing bracket; the head of the axial displacement monitoring probe is in contact with the displacement measurement positioning plate; the axial displacement monitoring probe is connected to the pre-amplifier and the display through a cable, a control power supply is switched on, and the axial displacement real-time monitoring function is achieved. The method comprises the following steps: measuring the thickness of the moving ring and the static ring, assembling the mechanical seal, and increasing the shrinkage of the mechanical seal; the assembled floating static ring type mechanical seal abrasion loss online monitoring device is installed on a test bed, and initial data of the axial displacement probe are recorded; and starting the running test platform, and monitoring the running temperature and pressure of the mechanical seal and the real-time data of the axial displacement of the static ring. The method is convenient to implement, timely in monitoring and low in cost.

Description

Technical Field

[0001] The present invention relates to the field of mechanical maintenance, and in particular to an online monitoring device and method for the wear of a floating static ring type mechanical seal. Background Art

[0002] Mechanical seals are the core components of pumping equipment. Their friction pairs generally include soft rings and hard rings. Soft rings are prone to wear during operation. If the wear exceeds the design margin, it will directly lead to seal failure. Currently, the industry mainly monitors the operation of mechanical seals indirectly through parameters such as mechanical seal cooling water temperature, pressure, mechanical seal leakage, and filter pressure difference, but cannot directly monitor the wear of the sealing rings. Due to the small design space and precise matching dimensions of mechanical seals, it is difficult to directly install a sealing ring wear measurement device using conventional methods. If technical improvements can be made to achieve direct monitoring of the wear of the mechanical seal sealing surface, the effectiveness of mechanical seal performance monitoring and the reliability of pump equipment can be greatly improved. It can also effectively promote the transition of mechanical seal maintenance mode from regular replacement to predictive maintenance, significantly reducing the operating and maintenance costs of pump equipment. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an online monitoring device and method for the wear of a floating static ring type mechanical seal, which is convenient to implement, timely to monitor and low in cost.

[0004] The present invention provides an online monitoring device for the wear of a floating stationary ring mechanical seal, comprising:

[0005] An axial displacement measurement positioning plate is installed on the stationary ring seat of the floating stationary ring mechanical seal;

[0006] A probe fixing bracket is provided on the mechanical seal end cover;

[0007] An axial displacement monitoring probe is installed on the probe fixing bracket, and the head of the axial displacement monitoring probe is in contact with the displacement measurement positioning plate;

[0008] The axial displacement monitoring probe cable is connected to the preamplifier and the display, and the control power is turned on to realize the real-time monitoring function of the axial displacement.

[0009] In a specific embodiment of the present invention, an axial displacement measurement positioning plate is installed on the back side of the stationary ring seat of the floating stationary ring type mechanical seal.

[0010] In a specific embodiment of the present invention, the probe fixing bracket is installed by utilizing the bolt holes of the mechanical seal end cover in combination with the on-site space.

[0011] In a specific embodiment of the present invention, the axial displacement monitoring probe is a miniature probe suitable for a narrow space.

[0012] In one embodiment of the present invention, the display has monitoring and alarm functions.

[0013] The real-time monitoring data collected by the axial displacement monitoring probe is uploaded to the display, stored and formed into a wear trend curve.

[0014] In a specific embodiment of the present invention, the axial displacement monitoring probe is connected to a transmitter, a preamplifier and a display in sequence.

[0015] The present invention provides an online monitoring method for the wear of a floating stationary ring type mechanical seal, comprising the following steps:

[0016] Step 1: Measure the thickness of the dynamic ring and the static ring, assemble the mechanical seal, and increase the mechanical seal shrinkage;

[0017] Step 2: Install the assembled floating static ring mechanical seal wear online monitoring device on the test bench and record the initial data of the axial displacement probe;

[0018] Step 3: Start the operating test platform and monitor the real-time data of the mechanical seal operating temperature, pressure and static ring axial displacement.

[0019] In a specific embodiment of the present invention, step 3 includes:

[0020] Step 3-1: Start the test platform, simulate actual working conditions in the test bench, and record the wear rate under different loads;

[0021] Step 3-2: Monitor the real-time data of mechanical seal operating temperature, pressure and static ring axial displacement;

[0022] Step 3-3: Calculate the wear volume using the implementation data.

[0023] In a specific embodiment of the present invention, step 4 is further included, and step 4 is specifically:

[0024] Sudden displacement changes or excessive total displacement trigger a level 1 alarm.

[0025] In a specific embodiment of the present invention, the sudden displacement change refers to >50 μm / s, and the excessive total displacement refers to >1000 μm.

[0026] Compared with the existing technology, the online monitoring device and method for the wear of a floating stationary ring mechanical seal of the present invention improves the mechanical seal cover and the stationary ring seat, adds an axial displacement positioning plate, an axial displacement probe and a bracket, and realizes the real-time monitoring function of the stationary ring movement. It can measure the wear of the mechanical seal sealing pair in real time and effectively predict the service life of the mechanical seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1A schematic diagram showing the structure of an online monitoring device for wear of a floating static ring type mechanical seal;

[0028] In the figure, 1-mechanical seal sleeve, 2-dynamic ring seat, 3-dynamic ring, 4-static ring, 5-static ring, 6-mechanical seal end cover, 7-axial displacement measurement positioning plate, 8-axial displacement monitoring probe, 9-probe fixing bracket, 10-transmitter, 11-preamplifier, 12-display. DETAILED DESCRIPTION

[0029] In order to further understand the present invention, embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than for limiting the present invention.

[0030] The embodiment of the present invention discloses an online monitoring device for the wear of a floating stationary ring mechanical seal. Figure 1 As shown, including:

[0031] An axial displacement measurement positioning plate 7 is installed on the stationary ring seat 5 of the floating stationary ring mechanical seal;

[0032] Specifically, an axial displacement measurement positioning plate 7 is designed and installed on the back of the mechanical seal static ring seat 5, the measurement position is transferred to the outside, and the mechanical seal end cover 6 is processed to ensure that there is sufficient clearance between the dynamic and static parts;

[0033] A probe fixing bracket 9 is provided on the mechanical seal end cover 6;

[0034] Utilize the bolt holes of the mechanical seal end cover 6 and the on-site space to install the probe fixing bracket 9;

[0035] An axial displacement monitoring probe 8 is mounted on the probe fixing bracket 9, and the head of the axial displacement monitoring probe 8 is in contact with the displacement measurement positioning plate 7;

[0036] The axial displacement monitoring probe 8 is connected to the preamplifier 11 and the display 12 by a cable, and the control power is turned on to realize the real-time monitoring function of the axial displacement.

[0037] The axial displacement monitoring probe 8 is a miniature probe suitable for use in a narrow space.

[0038] The display 12 has monitoring and alarm functions.

[0039] The real-time monitoring data collected by the axial displacement monitoring probe 8 is uploaded to the display 12 for storage and forms a wear trend curve.

[0040] The axial displacement monitoring probe 8 is connected to a transmitter 10 for signal conversion. The transmitter 10 is connected to a preamplifier 11 and a display 12.

[0041] In the present invention, the installation of the axial displacement measurement positioning plate 7, the axial displacement monitoring probe 8, the probe fixing bracket 9, the transmitter 10, the preamplifier 11 and the display 12 does not affect the normal operation of the mechanical seal.

[0042] An embodiment of the present invention further discloses an online monitoring method for wear of a floating stationary ring mechanical seal, comprising the following steps:

[0043] Step 1: Measure the thickness of the dynamic ring and the static ring, assemble the mechanical seal, and increase the mechanical seal shrinkage;

[0044] Step 2: Install the assembled floating static ring mechanical seal wear online monitoring device on the test bench and record the initial data of the axial displacement probe;

[0045] Step 3: Start the operating test platform and monitor the real-time data of the mechanical seal operating temperature, pressure and static ring axial displacement.

[0046] The step 3 includes:

[0047] Step 3-1: Start the test platform, simulate actual working conditions in the test bench, and record the wear rate under different loads;

[0048] Step 3-2: Monitor the real-time data of mechanical seal operating temperature, pressure and static ring axial displacement;

[0049] Step 3-3: Calculate the wear amount Δh=h using the actual data 初始 -h 当前 ;

[0050] Step 4: Sudden displacement change or excessive total displacement triggers a level 1 alarm.

[0051] The sudden displacement change refers to >50 μm / s, and the excessive total displacement during operation refers to >1000 μm.

[0052] The present invention monitors the accuracy of online monitoring, specifically comprising the following steps:

[0053] Before the test, measure the thickness of the dynamic and static rings of the mechanical seal, increase the compression of the mechanical seal to accelerate the wear rate of the sealing surface, and assemble the mechanical seal;

[0054] Install the floating static ring mechanical seal wear online monitoring device on the operating test bench and record the initial data of the axial displacement probe;

[0055] Start the operation test platform, during which the real-time data of the mechanical seal operating temperature, pressure and static ring axial displacement are detected;

[0056]

[0057] After running for about 2 hours, stop the operation, record the final axial displacement data, disassemble and check the wear of the dynamic and static rings of the mechanical seal, measure the thickness of the dynamic and static rings, and compare them with the corresponding data before the test;

[0058] Combined with the above-mentioned actual case verification, it is shown that the online monitoring method and device for mechanical seal wear introduced in the present invention can effectively monitor the real-time wear of the sealing ring of the floating static ring mechanical seal, which is of great significance for the operating status monitoring and remaining life evaluation of the floating static ring mechanical seal.

[0059] The above embodiments are only intended to help understand the method and core concept of the present invention. It should be noted that, without departing from the principles of the present invention, a number of improvements and modifications may be made to the present invention by those skilled in the art, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0060] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An online monitoring device for wear of a floating stationary ring mechanical seal, characterized in that: include: An axial displacement measurement positioning plate is installed on the stationary ring seat of the floating stationary ring mechanical seal; A probe fixing bracket is provided on the mechanical seal end cover; An axial displacement monitoring probe is installed on the probe fixing bracket, and the head of the axial displacement monitoring probe is in contact with the displacement measurement positioning plate; The axial displacement monitoring probe cable is connected to the preamplifier and the display, and the control power is turned on to realize the real-time monitoring function of the axial displacement.

2. The online monitoring device for wear of a floating stationary ring mechanical seal according to claim 1 is characterized in that: An axial displacement measurement positioning plate is installed on the back side of the stationary ring seat of the floating stationary ring type mechanical seal.

3. The online monitoring device for wear of a floating stationary ring mechanical seal according to claim 1 is characterized in that: The probe fixing bracket is installed by utilizing the bolt holes of the mechanical seal end cover and the on-site space.

4. The online monitoring device for wear of a floating stationary ring mechanical seal according to claim 1, characterized in that: The axial displacement monitoring probe is a miniature probe suitable for narrow spaces.

5. The online monitoring device for wear of a floating stationary ring mechanical seal according to claim 1 is characterized in that: The display has monitoring and alarm functions. The real-time monitoring data collected by the axial displacement monitoring probe is uploaded to the display, stored and formed into a wear trend curve.

6. The online monitoring device for wear of a floating stationary ring mechanical seal according to claim 1, characterized in that: The axial displacement monitoring probe is connected to the transmitter, the preamplifier and the display in sequence.

7. A method for online monitoring of wear of a floating stationary ring mechanical seal, characterized in that: The following steps are involved: Step 1: Measure the thickness of the dynamic ring and the static ring, assemble the mechanical seal, and increase the mechanical seal shrinkage; Step 2: Install the assembled floating static ring mechanical seal wear online monitoring device on the test bench and record the initial data of the axial displacement probe; Step 3: Start the operating test platform and monitor the real-time data of the mechanical seal operating temperature, pressure and static ring axial displacement.

8. The online monitoring method for wear of a floating stationary ring mechanical seal according to claim 7, characterized in that: The step 3 includes: Step 3-1: Start the test platform, simulate actual working conditions in the test bench, and record the wear rate under different loads; Step 3-2: Monitor the real-time data of mechanical seal operating temperature, pressure and static ring axial displacement; Step 3-3: Calculate the wear volume using the implementation data.

9. The online monitoring method for wear of a floating stationary ring mechanical seal according to claim 7, characterized in that: The method further includes step 4, wherein the step 4 is specifically: Sudden displacement changes or excessive total displacement trigger a level 1 alarm.

10. The online monitoring method for wear of a floating stationary ring mechanical seal according to claim 9, characterized in that: The sudden displacement change refers to >50 μm / s, and the excessive total displacement during operation refers to >1000 μm.

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