A multi-balance diameter intelligent mechanical seal device

Abstract

This invention discloses a multi-balance diameter intelligent mechanical seal device. The mechanical seal seals the opening of a media cavity and includes a compensating ring seat and a stationary compensating ring coaxially fixed to the compensating ring seat. The gap between the stationary compensating ring and the compensating ring seat is filled and sealed by sealing rings. At least two sets of sealing rings are provided, with each sealing ring spaced apart along the axial direction of the stationary compensating ring. The balance diameters of the stationary compensating rings at corresponding sealing ring locations are unequal. The gaps between adjacent sets of sealing rings form independent communicating cavities, each communicating cavity connected to a pressure source or standard atmospheric pressure. The pressure source is the media cavity or a simulated media cavity with parameters equal to those within the media cavity. This invention improves the maximum operating pressure range of the mechanical seal and, while meeting the requirements for sealing leakage, can proactively minimize the mechanical seal torque, power consumption, and seal life.

Description

Technical Field

[0001] This invention relates to the field of mechanical seals, specifically a multi-balance diameter intelligent mechanical seal device. 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 a multi-balance diameter intelligent mechanical seal device. This invention allows for changes in the balance diameter of the mechanical seal to suit different operating conditions, thereby expanding the application range of the mechanical seal.

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

[0006] A multi-balance diameter intelligent mechanical seal device is disclosed. The mechanical seal closes the opening of a medium cavity. The mechanical seal includes a compensation ring seat and a stationary compensation ring fixed coaxially with the compensation ring seat. The gap between the stationary compensation ring and the compensation ring seat is filled and sealed by a sealing ring. At least two sets of sealing rings are provided, and each sealing ring is arranged at intervals along the axial direction of the stationary compensation ring. The balance diameters of the stationary compensation rings at the corresponding sealing rings are not equal. The gaps between two adjacent sets of sealing rings form independent communicating cavities. Each communicating cavity is connected to a pressure source or standard atmospheric pressure. The pressure source is the medium cavity or a simulated medium cavity with parameters equal to those in the medium cavity.

[0007] As a further aspect of the present invention: the compensation ring seat is provided with an inlet and an outlet, which are respectively connected to each communicating cavity. The inlet is connected to the medium cavity through a connecting pipe, and the outlet is connected to the outside air through a discharge pipe. Each connecting pipe and discharge pipe is equipped with a solenoid valve for controlling the opening and closing of the pipeline.

[0008] As a further embodiment of the present invention: the mechanical seal is installed at the opening of the pump body, and the drive shaft of the pump body extends into the medium cavity of the pump body and rotates in cooperation with the stationary compensation ring.

[0009] As a further aspect of the present invention: a speed sensor is installed on the drive shaft.

[0010] As a further aspect of the present invention, a temperature sensor is installed inside the medium cavity of the pump body.

[0011] As a further embodiment of the present invention: a pressure sensor is provided inside the connecting pipe and / or the medium cavity.

[0012] As a further aspect of the present invention: there are three sets of sealing rings, and along the direction away from the pump body, the balance diameter of the static compensation ring at the corresponding sealing ring gradually decreases.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 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, so as to complete the change of the optimal balance diameter of the static compensation ring, which improves the maximum operating pressure range of the mechanical seal. Under the premise of meeting the sealing leakage requirements, it can actively achieve the minimization of mechanical seal torque, the minimization of power consumption, and the maximization of seal life.

[0015] 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

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] In the picture:

[0018] 1. Pump body; 11. Medium chamber; 111. Temperature sensor;

[0019] 12. Drive shaft; 121. Speed ​​sensor;

[0020] 13. Connecting pipe; 131. Pressure sensor; 132. Solenoid valve; 133. Discharge pipe;

[0021] 2. Mechanical seal; 21. Static compensating ring; 22. Compensating ring seat;

[0022] 23. Sealing ring; 24. Communicating cavity; 25. Liquid inlet; 26. Exhaust port. Detailed Implementation

[0023] 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.

[0024] Please see Figure 1 In this embodiment of the invention, a multi-balance diameter intelligent mechanical seal device is provided. The mechanical seal 2 is installed on equipment such as centrifugal pumps, centrifuges, reaction vessels 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] Taking the setting of three sets of sealing rings 23 as an example, along the direction away from the pump body 1, the balance diameter of the stationary compensation ring 21 at the corresponding sealing ring 23 decreases sequentially. When changing the balance diameter of the mechanical seal 2, the following steps need to be performed sequentially:

[0032] S1. Complete the installation of mechanical seal 2, so that pump body 1 enters the working state;

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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 multi-balance diameter intelligent mechanical seal device, characterized in that, The mechanical seal (2) closes the opening of the medium cavity (11). 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 at intervals 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 cavity (11) or a simulated medium cavity with the same parameters as the medium cavity (11). When the balance diameter is changed, the connecting cavity (24) on one side of the sealing ring (23) corresponding to the balance diameter is connected to the medium cavity (11), and the connecting cavity (24) on the other side is connected to the outside air.

2. The multi-balance diameter intelligent mechanical seal device according to claim 1, characterized in that, The compensation ring seat (22) is provided with an inlet (25) and an outlet (26) to communicate with each of the connecting chambers (24). The inlet (25) is connected to the medium chamber (11) through the connecting pipe (13), and the outlet (26) is connected to the outside air through the 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.

3. The multi-balance diameter intelligent mechanical seal device according to claim 2, characterized in that, The mechanical seal (2) is installed at the opening of the pump body (1), and the drive shaft (12) of the pump body (1) extends into the medium cavity (11) of the pump body (1) and rotates in cooperation with the stationary compensation ring (21).

4. The multi-balance diameter intelligent mechanical seal device according to claim 3, characterized in that, A speed sensor (121) is installed on the drive shaft (12).

5. The multi-balance diameter intelligent mechanical seal device according to claim 3, characterized in that, A temperature sensor (111) is installed in the medium chamber (11) of the pump body (1).

6. The multi-balance diameter intelligent mechanical seal device according to claim 3, characterized in that, A pressure sensor (131) is provided in the connecting pipe (13) and / or the medium cavity (11).

7. The multi-balance diameter intelligent mechanical seal device according to claim 3, characterized in that, There are three sets of sealing rings (23). Along the direction away from the pump body (1), the balance diameter of the static compensation ring (21) at the corresponding sealing ring (23) gradually decreases.

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