Intelligent changing method for mechanical seal balance diameter

Abstract

The application discloses an intelligent changing method for the balance diameter of a mechanical seal, which comprises the following steps: S1, installing the mechanical seal at the opening of a pump body, and making the pump body enter a working state; S2, collecting the data of a rotating speed sensor, a temperature sensor and a pressure sensor when the pump body is working, and determining the optimal balance diameter according to the data; and S3, according to the optimal balance diameter determined in step S2, controlling the shutoff of the connecting pipes corresponding to the communication cavities and the discharge pipeline, making the sealing ring at the optimal balance diameter of the static compensation ring enter a working state, and completing the change of the optimal balance diameter. The application can complete the intelligent change of the balance diameter of the mechanical seal, improve the maximum use pressure range of the mechanical seal, and actively realize the minimization of the torque of the mechanical seal, the minimization of the consumed power and the maximization of the sealing life under the premise of meeting the sealing leakage requirement.

Description

Technical Field

[0001] This invention relates to the field of mechanical seals, specifically a method for intelligently changing the balance diameter of a mechanical seal. Background Technology

[0002] A mechanical seal is a device that prevents fluid leakage by consisting of at least one pair of end faces perpendicular to the axis of rotation, which are kept in contact and slide relative to each other under the action of fluid pressure, the elastic or magnetic force of the compensation mechanism, and the cooperation of auxiliary seals. As the heart of moving equipment, the reliable operation of mechanical seals is of great importance. The friction pair of the sealing surface is the key part of mechanical seals and is the core of research.

[0003] Changing the balance diameter of a mechanical seal will cause changes in the load on the seal's end face. However, the operating conditions of a mechanical seal are not fixed. When the medium in the sealing cavity is at low pressure, it is often desirable to appropriately increase the end face load to reduce leakage, requiring the mechanical seal to be at a slightly smaller balance diameter. When the medium in the sealing cavity is at high pressure, it is often desirable to appropriately decrease the end face load to reduce heat generation on the sealing surface, improve the lubrication and cooling effect of the sealing surface, and increase the liquid film thickness, requiring the mechanical seal to be at a slightly larger balance diameter. When the seal is at a normal linear velocity, it is often desirable to appropriately increase the end face load to reduce leakage, requiring the mechanical seal to be at a slightly smaller balance diameter. At higher linear velocities, to reduce heat generation on the sealing surface, improve lubrication and cooling, and increase liquid film thickness, it is often desirable to appropriately reduce the end face load, requiring the mechanical seal to be at a slightly larger equilibrium diameter. When the sealing medium of the mechanical seal is at room temperature, to reduce leakage, it is often desirable to appropriately increase the end face load, requiring the mechanical seal to be at a slightly smaller equilibrium diameter. When the sealing medium of the mechanical seal is at a higher temperature, to prevent vaporization of the medium on the sealing surface, it is necessary to reduce heat generation on the sealing surface, improve lubrication and cooling, and increase liquid film thickness, often requiring an appropriate reduction in the end face load, requiring the mechanical seal to be at a slightly larger equilibrium diameter. However, current mechanical seals cannot adapt to these changing operating conditions and conflicting requirements, resulting in a narrow range of applications, thus necessitating a solution. Summary of the Invention

[0004] To avoid and overcome the technical problems existing in the prior art, this invention provides an intelligent method for changing the balance diameter of a mechanical seal. This invention allows for changing the balance diameter of the mechanical seal for different operating conditions, thus improving the application range of the mechanical seal.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for intelligently changing the balance diameter of a mechanical seal includes the following steps:

[0007] S1. Install the mechanical seal at the opening of the pump body to put the pump body into working condition;

[0008] The mechanical seal closes the opening of the medium cavity. The drive shaft of the pump body extends into the medium cavity of the pump body and rotates with the stationary compensating ring. The mechanical seal includes a compensating ring seat and a stationary compensating ring fixed coaxially with the compensating ring seat. The gap between the stationary compensating ring and the compensating ring seat is filled and sealed by a sealing ring. At least two sets of sealing rings are provided. Each sealing ring is arranged at intervals along the axial direction of the stationary compensating ring. The balance diameter of the stationary compensating ring at the corresponding sealing ring is not equal. The gap between two adjacent sets of sealing rings forms an independent connecting cavity. Each connecting cavity is connected to a pressure source or standard atmospheric pressure. The pressure source is the medium cavity or a simulated medium cavity with the same parameters as the medium cavity.

[0009] The compensation ring seat is provided with a liquid inlet and a vent, which are respectively connected to each of the connecting chambers. The liquid inlet is connected to the medium chamber through a connecting pipe, and the vent is connected to the outside air through a discharge pipe. Each of the connecting pipes and discharge pipes is equipped with a solenoid valve to control the opening and closing of the pipes.

[0010] A speed sensor is installed on the drive shaft; a temperature sensor is installed in the medium cavity of the pump body; a pressure sensor is installed in the connecting pipe and / or the medium cavity.

[0011] S2. When the pump is working, it collects data from the speed sensor, temperature sensor and pressure sensor, and determines the optimal balance diameter based on the data.

[0012] S3. Based on the optimal balance diameter determined in step S2, control the shut-off of the connecting pipes and discharge pipes corresponding to each connecting cavity, so that the sealing ring at the optimal balance diameter of the static compensation ring is in working condition, and the change of the optimal balance diameter is completed.

[0013] As a further aspect of the present invention: the mechanical seal is provided with three sets of sealing rings, and along the direction away from the pump body, the balance diameter of the stationary compensation ring at the corresponding sealing ring gradually decreases, with balance diameters of X+b, X+a, and X respectively; when changing the balance diameter in step S3:

[0014] S31. The solenoid valves on the connecting pipe and discharge pipe near the pump body are opened, and the solenoid valves on the connecting pipe and discharge pipe away from the pump body are closed after venting and filled with medium. At this time, all connecting chambers are filled with medium, and the balance diameter X is effective.

[0015] S32. The solenoid valve on the connecting pipe near the pump body is open, and the solenoid valve on the discharge pipe near the pump body is closed after venting and filled with medium. The solenoid valve on the connecting pipe away from the pump body is closed, and the solenoid valve on the discharge pipe away from the pump body is open. At this time, the pressure of the connecting chamber near the pump body is effectively connected to the medium chamber, and the connecting chamber away from the pump body is effectively connected to the atmosphere. The balance diameter X+a is effective.

[0016] S33. The solenoid valves on the connecting pipe and discharge pipe near the pump body are closed, while the solenoid valves on the connecting chamber and discharge pipe away from the pump body are opened. At this time, both sets of connecting chambers are effectively connected to the atmosphere, and the balance diameter X+b is effective.

[0017] As a further embodiment of the present invention: the solenoid valves on the connecting pipe and the discharge pipe on the side away from the pump body are closed and filled with medium after a delay of 0.1 to 0.2 seconds to vent air; in step S32, the solenoid valves on the discharge pipe on the side close to the pump body are closed and filled with medium after a delay of 0.1 to 0.2 seconds to vent air.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The static compensation ring of the present invention has different balance diameters at each sealing ring, and there is a gap between adjacent sealing rings. Adjusting this gap to connect with the medium cavity or the outside air, when it is necessary to change the balance diameter, the connecting cavity on one side of the sealing ring corresponding to the balance diameter is connected with the medium cavity, and the connecting cavity on the other side is connected with the outside air. This can complete the intelligent change of the optimal balance diameter of the static compensation ring, improve the maximum operating pressure range of the mechanical seal, and under the premise of meeting the sealing leakage requirements, can actively achieve the minimization of mechanical seal torque, the minimization of power consumption, and the maximization of seal life.

[0020] 2. The inlet of this invention is connected to the medium chamber through a connecting pipe, and the outlet is connected to the outside air through a discharge pipe. Solenoid valves are installed on both the connecting pipe and the discharge pipe to facilitate the opening and closing of the pipes and the discharge of the medium in the discharge pipe. The setting of speed sensor, temperature sensor and pressure sensor facilitates the real-time acquisition of various working parameters, so as to confirm the most suitable balance diameter under the working condition in real time. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] In the picture:

[0023] 1. Pump body; 11. Medium chamber; 111. Temperature sensor;

[0024] 12. Drive shaft; 121. Speed ​​sensor;

[0025] 13. Connecting pipe; 131. Pressure sensor; 132. Solenoid valve; 133. Discharge pipe;

[0026] 2. Mechanical seal; 21. Static compensating ring; 22. Compensating ring seat;

[0027] 23. Sealing ring; 24. Communicating cavity; 25. Liquid inlet; 26. Exhaust port. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figure 1 In this embodiment of the invention, a method for intelligently changing the balance diameter of a mechanical seal includes the following steps:

[0030] S1. Install the mechanical seal 2 at the opening of the pump body 1 to put the pump body 1 into working condition;

[0031] The mechanical seal 2 is installed on equipment such as centrifugal pumps, centrifuges, reactors or compressors. Taking the installation on a centrifugal pump as an example, there is a medium cavity 11 inside the pump body 1, and the opening of the medium cavity 11 is sealed by the mechanical seal 2.

[0032] The mechanical seal 2 includes a coaxially fixed stationary compensating ring 21 and a compensating ring seat 22. The stationary compensating ring 21 is rotatably fitted with the drive shaft 12. The gap between the stationary compensating ring 21 and the compensating ring seat 22 is filled and sealed by sealing rings 23. At least two sets of sealing rings 23 are provided, and the gaps between adjacent sets of sealing rings 23 form independent annular communicating cavities 24. The balance diameter of the stationary compensating ring 21 at each corresponding sealing ring 23 is not equal.

[0033] The compensation ring seat 22 has inlet ports 25 and outlet ports 26 corresponding to the number of each connecting cavity 24, and each inlet port 25 and outlet port 26 is connected to the corresponding connecting cavity 24.

[0034] Each liquid inlet 25 is connected to an independent connecting pipe 13, and each exhaust port 26 is connected to an independent discharge pipe 133. Solenoid valves 132 are installed on the connecting pipes 13 and the discharge pipes 133 to control the opening and closing of the pipes.

[0035] Each liquid inlet 25 is directly connected to the medium cavity 11 via a connecting pipe 13, or connected to an external simulated medium cavity. The parameters of the simulated medium cavity must be equal to the parameters inside the medium cavity 11 in order to simulate the environment of the medium cavity 11.

[0036] Each exhaust port 26 is connected to a standard atmospheric pressure via an exhaust pipe 133. The standard atmospheric pressure here is usually outside air or a simulation chamber that simulates outside air.

[0037] To monitor operating parameters in real time, a speed sensor 121 is installed on the drive shaft 12, a temperature sensor 111 is installed in the medium chamber 11 of the pump body 1, and a pressure sensor 131 is installed in the medium chamber 11.

[0038] S2. When the pump body 1 is working, it collects data from the speed sensor 121, temperature sensor 111 and pressure sensor 131, and determines the optimal balance diameter based on the data.

[0039] Each sensor can be connected to a computer to intelligently determine the optimal balance diameter through analysis, and automatically control and adjust the switch to the optimal balance diameter.

[0040] S3. Based on the optimal balance diameter determined in step S2, control the shut-off of the connecting pipe 13 and the discharge pipe 133 corresponding to each connecting cavity 24, so that the sealing ring 23 at the optimal balance diameter of the static compensation ring 21 is in working condition; along the direction away from the pump body 1, the balance diameter of the static compensation ring 21 at the corresponding sealing ring 23 decreases sequentially, and the balance diameters are X+b, X+a and X respectively.

[0041] The balance diameter is the effective diameter of the medium pressure at the sealing ring 23, and it is in a balanced state. Selecting the optimal balance diameter can be understood as making the sealing ring 23 at the optimal balance diameter of the static compensation ring 21 work.

[0042] S31, the solenoid valve 132 on the connecting pipe 13 and the discharge pipe 133 on the side closer to the pump body 1 is opened, and the solenoid valve 132 on the connecting pipe 13 and the discharge pipe 133 on the side farther from the pump body 1 is closed after venting for 0.1 to 0.2 seconds and filled with medium. At this time, each connecting cavity 24 is filled with medium, and the balance diameter X is effective.

[0043] S32, the solenoid valve 132 on the connecting pipe 13 near the pump body 1 opens, the solenoid valve 132 on the discharge pipe 133 near the pump body 1 closes after a delay of 0.1 to 0.2 seconds and is filled with medium, the solenoid valve 132 on the connecting pipe 13 away from the pump body 1 closes, and the solenoid valve 132 on the discharge pipe 133 away from the pump body 1 opens. At this time, the connecting chamber 24 near the pump body 1 is effectively connected to the medium chamber 11 under pressure, and the connecting chamber 24 away from the pump body 1 is effectively connected to the atmosphere, and the balance diameter X+a is effective.

[0044] S33, the solenoid valve 132 on the connecting pipe 13 and the discharge pipe 133 near the pump body 1 is closed, and the solenoid valve 132 on the connecting chamber 24 and the discharge pipe 133 away from the pump body 1 is opened. At this time, both sets of connecting chambers 24 are effectively connected to the atmosphere, and the balance diameter X+b is effective.

[0045] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0046] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0047] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0048] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0049] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A method for intelligently changing the balance diameter of a mechanical seal, characterized in that, Includes the following steps: S1. Install the mechanical seal (2) at the opening of the pump body (1) to put the pump body (1) into working condition; The mechanical seal (2) closes the opening of the medium chamber (11). The drive shaft (12) of the pump body (1) extends into the medium chamber (11) of the pump body (1) and rotates with the stationary compensation ring (21). The mechanical seal (2) includes a compensation ring seat (22) and a stationary compensation ring (21) fixed coaxially with the compensation ring seat (22). The gap between the stationary compensation ring (21) and the compensation ring seat (22) is filled and sealed by a sealing ring (23). The sealing ring (23) is provided in at least two sets. Each sealing ring (23) is arranged axially along the stationary compensation ring (21). The balance diameter of the stationary compensation ring (21) at the corresponding sealing ring (23) is not equal. The gap between two adjacent sets of sealing rings (23) forms an independent connecting cavity (24). Each connecting cavity (24) is connected to a pressure source or standard atmospheric pressure. The pressure source is the medium chamber (11) or a simulated medium chamber with the same parameters as the medium chamber (11). The compensation ring seat (22) is provided with an inlet (25) and an outlet (26) to communicate with each of the communicating chambers (24). The inlet (25) is connected to the medium chamber (11) through a connecting pipe (13), and the outlet (26) is connected to the outside air through a discharge pipe (133). Each of the connecting pipes (13) and the discharge pipes (133) is equipped with a solenoid valve (132) to control the opening and closing of the pipes. A speed sensor (121) is installed on the drive shaft (12); a temperature sensor (111) is installed in the medium chamber (11) of the pump body (1); a pressure sensor (131) is provided in the connecting pipe (13) and / or the medium chamber (11). S2. When the pump body (1) is working, it collects data from the speed sensor (121), temperature sensor (111) and pressure sensor (131) and determines the optimal balance diameter based on the data. S3. Based on the optimal balance diameter determined in step S2, control the shut-off of the connecting pipe (13) and the discharge pipe (133) corresponding to each connecting cavity (24), so that the sealing ring (23) at the optimal balance diameter of the static compensation ring (21) is in working condition, and the change of the optimal balance diameter is completed.

2. The intelligent method for changing the balance diameter of a mechanical seal according to claim 1, characterized in that, The mechanical seal (2) is provided with three sets of sealing rings (23). Along the direction away from the pump body (1), the balance diameter of the stationary compensation ring (21) at the corresponding sealing ring (23) gradually decreases. The balance diameters are X+b, X+a and X, respectively. When changing the balance diameter in step S3: S31, the solenoid valve (132) on the connecting pipe (13) and the discharge pipe (133) on the side close to the pump body (1) is opened, and the solenoid valve (132) on the connecting pipe (13) and the discharge pipe (133) on the side away from the pump body (1) is closed after venting and filled with medium. At this time, each connecting cavity (24) is filled with medium, and the balance diameter X is effective. S32, the solenoid valve (132) on the connecting pipe (13) near the pump body (1) is opened, the solenoid valve (132) on the discharge pipe (133) near the pump body (1) is closed after venting and filled with medium, the solenoid valve (132) on the connecting pipe (13) away from the pump body (1) is closed, the solenoid valve (132) on the discharge pipe (133) away from the pump body (1) is opened, at this time the connecting chamber (24) near the pump body (1) is effectively connected to the medium chamber (11) by pressure, the connecting chamber (24) away from the pump body (1) is effectively connected to the atmosphere, and the balance diameter X+a is effective; S33, the solenoid valve (132) on the connecting pipe (13) near the pump body (1) and the discharge pipe (133) is closed, and the solenoid valve (132) on the connecting cavity (24) away from the pump body (1) and the discharge pipe (133) is opened. At this time, both sets of connecting cavities (24) are effectively connected to the atmosphere, and the balance diameter X+b is effective.

3. The intelligent method for changing the balance diameter of a mechanical seal according to claim 2, characterized in that, The solenoid valve (132) on the connecting pipe (13) away from the pump body (1) and the discharge pipe (133) closes and fills with medium after a delay of 0.1 to 0.2 seconds to exhaust gas; in step S32, the solenoid valve (132) on the discharge pipe (133) near the pump body (1) closes and fills with medium after a delay of 0.1 to 0.2 seconds to exhaust gas.

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