Sealing liquid replenishing device

Abstract

In order to solve the problem that sealing liquid is difficult to replenish in the prior art, the utility model provides a sealing liquid replenishing device which comprises a sealing tank connected with a supply pipeline and a reactor electrically connected with a motor, a mechanical seal is further arranged between the reactor and the motor, and the sealing tank is connected with a mechanical seal pipeline. And a pressure regulating valve is also arranged between the sealing tank and the supply pipeline. The sealing liquid can be automatically supplemented, long-term special protection of personnel is not needed, manpower resources can be saved, and device faults can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to polymeric reaction equipment technical field especially is related to a sealing liquid supplementing device. BACKGROUND

[0002] In the production of polymerization device, the esterification reactor adopts vertical stirring, and the sealing structure is double-end mechanical seal. The mechanical seal lubrication and cooling system usually adopts an external storage tank to add fresh ethylene glycol for self-circulation to cool and lubricate the mechanical seal. The polymerization production is a continuous production process. In the operation, the esterification mechanical seal fails in many sets of devices. The reasons are mainly the failure of the lower end surface of the mechanical seal (aging of the sealing element, end surface entrainment of solid particles, end surface damage, etc.). When the lower end surface of the mechanical seal fails, the sealing liquid will quickly flow into the reaction kettle, which will bring great safety hazards to the normal production. If not handled in time, the mechanical seal will fail due to the rapid temperature rise of the esterification steam heat transfer, causing the upper end surface of the mechanical seal to fail, the pressurized esterification steam to be sprayed out, and the device to be shut down, resulting in huge economic losses.

[0003] In order to solve the above problems, the utility model discloses a kind of real-time monitoring devices for mechanical seal of stirrer of esterification reactor, including pressure transmitter being located on the sealing liquid tank of esterification reactor, liquid level transmitter being located on the sealing liquid tank of esterification reactor, vibration sensor being located on the mechanical seal bearing part of esterification reactor, temperature transmitter being located in the sealing cavity of mechanical seal of esterification reactor and camera being located outside esterification reactor and capable of observing the running of esterification reactor, pressure transmitter, liquid level transmitter, vibration sensor and temperature transmitter are connected with secondary instrument or control system respectively, camera is connected with display device or control system. But the mechanical seal of the utility model leaks a lot, and it is very difficult to supplement, so personnel need to be long-term special care. UTILITY MODEL CONTENT

[0004] The utility model mainly solves the problem of difficult sealing liquid supplement in the prior art and provides a sealing liquid supplementing device.

[0005] The above technical problems of the utility model are mainly solved by the following technical solutions.

[0006] A sealing liquid supplementing device is characterized by comprising a sealing tank connected with a supply pipeline and a reactor electrically connected with a motor, a mechanical seal is further arranged between the reactor and the motor, the sealing tank is connected with the mechanical seal pipeline, and a pressure regulating valve is further arranged between the sealing tank and the supply pipeline. The sealing liquid can be automatically supplemented, personnel long-term special care is not needed, and human resources can be saved and device failure can be avoided.

[0007] As a preferred solution, the pressure regulating valve is provided with a pressure gauge, which facilitates the real-time monitoring and adjustment of the pressure in the pipeline by the operator.

[0008] As a preferred solution, the ball valve is further arranged between the pressure regulating valve and the supply pipeline, for completely cutting off or restoring the flow of medium in the pipeline, and also for regulating the flow.

[0009] As a preferred solution, the flow meter is further arranged between the pressure regulating valve and the sealed tank, for measuring the flow of medium in the pipeline.

[0010] As a preferred solution, the quick connector is further arranged between the flow meter and the sealed tank, for facilitating the maintenance and replacement of the equipment.

[0011] As a preferred solution, the hose is further arranged between the quick connector and the sealed tank, for improving the flexibility of the system.

[0012] As a preferred solution, the hose is made of PVE material, for ensuring the service life of the hose.

[0013] As a preferred solution, the cone valve is further arranged between the hose and the sealed tank, for effectively cutting off and controlling the flow of fluid.

[0014] As a preferred solution, the pipeline between the sealed tank and the mechanical seal is a double pipeline with opposite directions.

[0015] Therefore, the advantages of the present application are:

[0016] After the sealing liquid supplementing device is adopted, if the reactor container mechanical seal appears internal leakage, the sealing liquid supplementing device can be used in time to provide sufficient cooling and lubrication for the mechanical seal, ensure the normal operation of the mechanical seal, and thus ensure the normal operation of the esterification reactor, arrange a reasonable maintenance plan for replacement or normal production, and avoid huge losses caused by emergency shutdown. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the device structure diagram of the present application.

[0018] In the figure: 1, supply pipeline; 2, ball valve; 3, pressure regulating valve; 4, flow meter; 5, quick connector; 6, hose; 7, cone valve; 8, sealed tank; 9, mechanical seal; 10, reactor. DETAILED DESCRIPTION

[0019] The technical solutions of the present application will be further specifically described below by examples in combination with the drawings.

[0020] Example 1:

[0021] The polymerization production is uninterrupted continuous production, the esterification reaction is an important process of the polymerization production, a large amount of esterification steam and heat are generated in the esterification reaction process, when the machine seal normally operates, the closed machine seal circulation system can bring lubrication and cooling to the sealing ring surface, when the lower end surface of the esterification machine seal fails, the esterification steam will flow into the machine seal cavity due to the pressure effect, causing the sealing liquid to leak into the reactor at high temperature, lacking the lubrication and cooling of the sealing liquid can cause the high temperature of the sealing machine, causing the equipment to run failure, causing a large amount of esterification steam to be sprayed out, which can easily cause a fire or environmental accident, since the sealing machine cannot be repaired and replaced online, the device will be shut down without planning, causing a large amount of material to be wasted and huge economic losses, estimated at about 1 million.

[0022] In order to solve the above problems, the utility model provides a sealing liquid supplementing device, including sealing tank 8 connected with supply pipeline 1 and motor electric connection reactor 10, still be equipped with machine seal 9 between reactor 10 and motor, sealing tank 8 is connected with machine seal 9, still be equipped with pressure regulating valve 3 between sealing tank 8 and supply pipeline 1, pressure regulating valve 3 adopts high-precision, high-reliability control system to ensure that pressure regulating valve 3 can accurately adjust the pressure of sealing liquid.

[0023] Sealing tank 8 is connected with supply pipeline 1, is responsible for storing and supplying sealing liquid. It is made of high-strength, corrosion-resistant material to ensure the stability and safety of the sealing liquid. At the same time, the sealing tank 8 is equipped with pressure sensor and temperature sensor, which can monitor the pressure and temperature of the sealing liquid in real time and send alarm in time.

[0024] Reactor 10 is electrically connected with motor, responsible for delivering sealing liquid to reactor 10, made of high-temperature and corrosion-resistant material to ensure that reactor 10 can withstand high temperature and pressure. At the same time, reactor 10 is also equipped with pressure sensor and temperature sensor, which can monitor the pressure and temperature of reactor 10 in real time and send alarm in time.

[0025] Sealing liquid leakage during esterification reaction is an important cause of equipment failure and safety hazard. The sealing liquid supplementing device provided by the utility model can effectively solve the above problems and improve the safety, reliability and production efficiency of the esterification reaction device. The device can effectively prevent sealing liquid leakage, avoid fire and environmental pollution, and reduce equipment maintenance cost, thereby improving production efficiency.

[0026] Pressure gauge is provided on pressure regulating valve 3, which is convenient for operators to monitor and adjust the pressure in the pipeline in real time, to ensure that the pressure is kept within a reasonable range. Too high pressure may cause damage to the pipeline or equipment, and too low pressure may affect the normal operation of the subsequent process. The selection and installation position of the pressure gauge need to be carefully designed and calculated to ensure the measurement accuracy and reliability. The reading of the pressure gauge also needs to be checked regularly to eliminate measurement deviation.

[0027] A ball valve 2 is also installed between the pressure regulating valve 3 and the supply pipeline 1. Ball valve 2 is a common type of valve, characterized by its compact structure, good sealing performance, and flexible operation. It can be used to completely cut off or restore the flow of the medium in the pipeline, or to regulate the flow rate. By installing ball valve 2, operators can easily maintain or replace the pressure regulating valve 3 without affecting the operation of the entire pipeline system. The material and dimensions of ball valve 2 must be compatible with the pipeline and the medium to ensure safety and reliability.

[0028] A flow meter 4 is also installed between the pressure regulating valve 3 and the sealed tank 8. The flow meter 4 is an instrument for measuring the flow rate of the medium in the pipeline. It can provide key process parameters for monitoring and controlling the production process. Depending on the measurement principle, the flow meter 4 can be divided into various types, such as differential pressure type, vortex type, electromagnetic type, and thermal type. Selecting the appropriate type and specification of the flow meter 4 requires consideration of factors such as the physicochemical properties of the medium, the measurement range, and accuracy requirements. The installation location of the flow meter 4 is also crucial, requiring avoidance of flow disturbances and measurement blind spots.

[0029] A quick-connect fitting 5 is also provided between the flow meter 4 and the sealed tank 8. The quick-connect fitting 5 is a convenient pipe connection method, allowing for quick disassembly and reassembly, facilitating equipment maintenance and replacement. The quick-connect fitting 5 is typically made of metal or plastic and contains an internal sealing gasket or O-ring to ensure a tight seal at the connection. The size and material of the quick-connect fitting 5 must be compatible with the pipe and the medium to prevent leakage and corrosion. The use of the quick-connect fitting 5 must also comply with relevant operating procedures to ensure safety and reliability.

[0030] A flexible hose 6, made of PVE material, is also provided between the quick-connect fitting 5 and the sealed container 8. This hose not only improves the system's flexibility but also effectively buffers the impact of external vibrations on the sealed container 8, ensuring the stability and sealing performance of the entire sealing system. The hose 6 is made of PVE material, which has excellent corrosion resistance and good mechanical strength, while also possessing certain high-temperature resistance and wear resistance, enabling it to adapt to various complex working conditions. The selection of PVE material is based on the harsh conditions that may occur during system operation, such as high temperature, high pressure, and chemical corrosion. It ensures the performance stability of the hose 6 during long-term use and extends its service life.

[0031] The introduction of hose 6 is not merely for mechanical connection; its primary purpose is to address potential minor positional misalignments between the sealed tank 8 and the quick-connect fitting 5. During operation, vibrations, thermal expansion and contraction, or other external forces inevitably occur, causing slight movements in the connecting components. Without hose 6 as a buffer, these minor movements might be directly transmitted to the sealed tank 8 or the quick-connect fitting 5, affecting the stability of the entire sealing system. The flexibility of hose 6 effectively absorbs these minor displacements and vibrations, providing shock absorption and cushioning, thereby significantly improving system reliability.

[0032] A pagoda ball valve 7 is also installed between the hose 6 and the sealed tank 8. This design further enhances the system's ease of operation and sealing performance. The pagoda ball valve 7 is a simple and flexible valve with excellent fluid control performance. By installing the pagoda ball valve 7 between the hose 6 and the sealed tank 8, effective fluid cutoff and control can be achieved. During system maintenance and repair, operators can close the pagoda ball valve 7 to cut off the fluid passage between the hose 6 and the sealed tank 8, thereby avoiding potential risks caused by fluid leakage. Furthermore, the pagoda ball valve 7 also facilitates system venting and drainage; operators can easily perform system drainage operations by opening or closing the valve, further improving system operating efficiency.

[0033] The piping between the sealed tank 8 and the mechanical seal 9 consists of two pipes running in opposite directions. This dual-pipe design effectively prevents system failures caused by blockage in a single pipe or poor fluid flow. The opposite-direction dual-pipe design further optimizes the fluid distribution within the system, ensuring a uniform fluid distribution between the sealed tank 8 and the mechanical seal 9, thereby improving the overall system stability. Specifically, when fluid enters the sealed tank 8 through the first pipe, it merges and exchanges with fluid from the other pipe inside the sealed tank 8. This relative flow design effectively prevents dead zones within the sealed tank 8, while simultaneously improving fluid circulation efficiency and heat exchange.

[0034] This dual-pipe design, with its opposing flow directions, also provides a degree of protection for the system's safety. Under certain special operating conditions, such as abnormal pressure increases or fluid backflow during system operation, the dual-pipe structure can balance the internal pressure of the system through its opposing flow characteristics, preventing pipe damage or leakage caused by excessive pressure in a single pipe. Furthermore, the dual-pipe design facilitates routine system maintenance and troubleshooting. Operators can separately monitor the fluid flow in both pipes, quickly determining if there are blockages or other abnormalities in the system, reducing the time and cost of troubleshooting.

[0035] In summary, the synergistic effect of various components and designs, including the quick-connect fitting 5, hose 6, pagoda ball valve 72, sealing tank 8, and the opposing dual-pipeline structure, constitutes a highly efficient, stable, and safe sealing system. This system design not only optimizes sealing performance but also fully considers ease of operation and maintainability. The introduction of hose 6 improves the system's flexibility and vibration resistance, the pagoda ball valve 7 enhances fluid control and operational convenience, while the opposing dual-pipeline structure demonstrates significant advantages in fluid distribution, system safety, and ease of maintenance. These optimized design details reflect the attention to detail and the pursuit of overall system performance in engineering design. Through these carefully designed component and structural arrangements, the reliability and durability of the sealing system in practical applications can be significantly improved, thereby meeting the application requirements under various complex working conditions.

[0036] Example 2:

[0037] Working principle:

[0038] The sealing fluid of the mechanical seal 9 in the esterification reactor 10 is fresh ethylene glycol. Its main function is to lubricate and cool the annular surface of the mechanical seal 9 through the circulation of approximately 5 liters of liquid stored in the mechanical seal 9 and the sealed tank 8 under normal operating conditions. Due to the relatively tight design of the mechanical seal 9, the loss of sealing fluid is very small and negligible under normal circumstances. However, in some special situations, such as when a leak occurs at the lower end face of the mechanical seal 9, the situation becomes complicated and critical. When a leak occurs at the lower end face of the mechanical seal 9, pressurized esterification vapor (pressure approximately 0.1 MPa) inside the esterification reactor 10 will seep into the mechanical seal 9 through the leak, causing a drastic change in the physical state of the fresh ethylene glycol originally stored in the sealed tank 8. Due to the high temperature characteristics of the esterification vapor, the fresh ethylene glycol in the sealed tank 8 will rapidly heat up, with measured temperatures reaching approximately 120°C, while ethylene glycol will also rapidly leak out. Under such circumstances, the lubrication and cooling functions of the sealing fluid will be difficult to maintain, potentially posing a serious threat to the normal operation of the mechanical seal 9 and the overall safety of the reactor 10.

[0039] To address the problem caused by leakage in mechanical seal 9, a novel sealing fluid replenishment and regulation device can be implemented to effectively alleviate operational issues arising from this leakage. In this new design, the primary source of the sealing fluid is fresh ethylene glycol, supplied via a main fresh ethylene glycol pipe. The sealing fluid within this pipe is maintained at ambient temperature (approximately 25°C) and pressure at 0.6 MPa. To accommodate the actual operating pressure of the esterification reactor 10, a pressure-reducing valve is installed at the branch point connecting to the mechanical seal 9 system. This valve regulates the sealing fluid pressure to between 0.12 and 0.15 MPa. This pressure range is slightly higher than the internal operating pressure of the esterification reactor 10, ensuring smooth injection of the sealing fluid into the end face of mechanical seal 9. This design not only restores the necessary lubrication and cooling to the annular surface of mechanical seal 9 but also creates a pressure barrier to prevent further leakage of esterification vapors.

[0040] When fresh ethylene glycol is injected into the end face of mechanical seal 9 through the aforementioned device, the leaking mechanical seal 9 will carry the sealing fluid directly into the reactor 10. It should be noted that fresh ethylene glycol is one of the main raw materials for the esterification reaction; therefore, the replenishment of this sealing fluid will not adversely affect the reaction process. By adjusting the flow rate of the sealing fluid, it can even be considered as part of the reaction raw material and utilized, achieving production balance and full utilization of resources.

[0041] To more precisely control the amount of sealant replenished, a flow meter 4 can be installed on the sealant pipeline to monitor the injection volume in real time. Actual test data shows that when leakage at the lower end face of the mechanical seal 9 is severe, approximately 50 liters of fresh ethylene glycol are needed per hour to maintain the normal temperature and lubrication of the mechanical seal 9. This design not only effectively controls the temperature of the mechanical seal 9, ensuring its operating temperature remains between 35-40℃ (actual data), but also allows for precise calculation of the amount of ethylene glycol to be replenished via the flow meter 4 reading, thereby adjusting the overall ethylene glycol feed rate and preventing raw material imbalances caused by sealant leakage.

[0042] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A sealing fluid replenishment device, characterized in that, It includes a sealed tank connected to a supply pipeline and a reactor electrically connected to a motor. A mechanical seal is also provided between the reactor and the motor. The sealed tank is connected to the mechanical seal pipeline. A pressure regulating valve is also provided between the sealed tank and the supply pipeline.

2. The sealing fluid replenishment device according to claim 1, characterized in that, The pressure regulating valve is equipped with a pressure gauge.

3. The sealing fluid replenishment device according to claim 1, characterized in that, A ball valve is also provided between the pressure regulating valve and the supply pipeline.

4. A sealing fluid replenishment device according to claim 1, 2, or 3, characterized in that, A flow meter is also installed between the pressure regulating valve and the sealed tank.

5. A sealing fluid replenishment device according to claim 4, characterized in that, A quick-connect fitting is also provided between the flow meter and the sealed tank.

6. A sealing fluid replenishment device according to claim 5, characterized in that, A flexible hose is also provided between the quick-connect fitting and the sealed container.

7. A sealing fluid replenishment device according to claim 6, characterized in that, The hose is made of PVE material.

8. A sealing fluid replenishment device according to claim 6, characterized in that, A pagoda ball valve is also provided between the hose and the sealed container.

9. A sealing fluid replenishment device according to claim 1, characterized in that, The pipeline between the sealed container and the mechanical seal is a double pipeline with opposite directions.

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