A double-end-face mechanical seal sealing system of a petrochemical pipeline process pump

Abstract

The application discloses a double-end-face mechanical seal sealing system of a convenient disassembly type petroleum chemical pipeline process pump, which comprises a pump, a first liquid outlet is arranged in a high-pressure area of the pump, and a first liquid inlet is further arranged on the pump; a liquid storage tank assembly is provided with a cooling liquid inlet and a cooling liquid outlet at a lower end, the cooling liquid inlet is communicated with the first liquid outlet through a pipeline, the cooling liquid outlet is communicated with the first liquid inlet through a pipeline, and valves controllable by switches are arranged on the cooling liquid inlet and the cooling liquid outlet. The double-end-face mechanical seal sealing system of the convenient disassembly type petroleum chemical pipeline process pump is communicated with the cooling liquid inlet through the first liquid outlet and communicated with the cooling liquid outlet through the first liquid inlet, the first liquid outlet is arranged in the high-pressure area of the pump, and cooling and flushing can be realized through the conveying medium, so that a refrigerant conveying pipeline does not need to be additionally arranged, and thus the equipment structure can be simplified, and the setting and maintenance costs of the equipment are reduced.

Description

Technical Field

[0001] This invention relates to the field of petrochemical equipment technology, and more specifically, to a disassembly-friendly double-end mechanical seal system for petrochemical pipeline process pumps. Background Technology

[0002] The petrochemical pipeline process pump is a vertical, single-stage, single-suction pipeline centrifugal pump. Its vertical structure, with inlet and outlet flanges on the same centerline, results in a compact design, small footprint, and easy installation. For petrochemical pipeline processes, a corresponding cooling system is required. However, current market cooling systems require dedicated refrigerant pipelines and external refrigerant connections, which increases equipment complexity and significantly raises installation and maintenance costs.

[0003] In conclusion, how to simplify the equipment structure and reduce the equipment cost is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a disassembleable double-end mechanical seal system for petrochemical pipeline process pumps. The system uses the pump's own pressure difference as power, and the medium transported by the pump can be used to cool the double-end seal system without the need for additional cooling equipment and coolant, thereby simplifying the equipment and reducing costs.

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

[0006] A disassembly-friendly double-end mechanical seal system for petrochemical pipeline process pumps includes:

[0007] The pump has a first outlet in its high-pressure zone and a first inlet.

[0008] The liquid storage tank assembly has a coolant inlet and a coolant outlet at its lower end. The coolant inlet is connected to the first outlet through a pipe, and the coolant outlet is connected to the first inlet through a pipe. Both the coolant inlet and the coolant outlet are equipped with switchable valves.

[0009] Preferably, the pump is further provided with a second outlet and a second inlet, the liquid storage tank assembly is provided with a flushing liquid inlet and a flushing liquid outlet, the second outlet and the flushing liquid inlet are connected by a pipe, the second inlet and the flushing liquid outlet are connected by a pipe, the flushing liquid inlet is located above the flushing liquid outlet, and the second outlet is also located in the high-pressure zone of the pump.

[0010] Preferably, the liquid storage tank assembly includes a sealed tank and a column assembly. The sealed tank is equipped with a high-pressure alarm device and a low-liquid-level alarm device. The lower end face of the column assembly and the lower end face of the pump are located in the same horizontal plane.

[0011] Preferably, the sealed container is provided with a liquid level window for observing the liquid level inside, and the liquid level window is located above the flushing liquid inlet.

[0012] Preferably, the top of the sealed container is provided with a removable flange, which is used to connect the user collection system in the detached state and to seal the sealed container in the installed state.

[0013] Preferably, a pressure transmitter is provided between the removable flange and the sealed tank.

[0014] Preferably, the sealed container is provided with a sealing liquid filling port.

[0015] Preferably, the sealed container is also equipped with an LSL level switch and an LSH level switch.

[0016] Preferably, the first liquid inlet is provided with a three-way connector, and the other two ends of the three-way connector are respectively connected to the coolant outlet and the return port through pipes. The second liquid outlet, the second liquid inlet and the return port are located in the same plane, and the plane is also provided with an openable and closable vent hole.

[0017] Preferably, the pump is equipped with a double-end mechanical seal.

[0018] This invention provides a disassembleable double-end mechanical seal system for a petrochemical pipeline process pump. The pump has a first outlet in its high-pressure zone and a first inlet in its low-pressure zone. A storage tank assembly is located near the pump. The lower end of the storage tank assembly has a coolant inlet connected to the first outlet, and the lower end also has a coolant outlet connected to the first inlet. Both the coolant inlet and outlet are equipped with controllable valves. Coolant, under pressure in the high-pressure zone of the pump, flows from the first outlet and through a pipeline into the storage tank assembly. At this time, the valve at the coolant inlet opens, and the valve at the coolant outlet closes. After the coolant cools, the valve at the coolant outlet opens, and the coolant is discharged from the coolant outlet and flows back to the low-pressure zone of the pump. This eliminates the need for an additional refrigerant delivery pipeline, thereby simplifying the equipment structure and reducing installation and maintenance costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the easy-to-disassemble double-end mechanical seal system for petrochemical pipeline process pumps provided by the present invention.

[0021] Figure 2 for Figure 1 Cross-sectional view at point AA.

[0022] Figure label:

[0023] 1-Pump; 2-First outlet; 3-First inlet; 4-Storage tank assembly; 5-Coolant inlet; 6-Coolant outlet; 7-Second outlet; 8-Second inlet; 9-Flush fluid inlet; 10-Flush fluid outlet; 11-Sealed tank; 12-Level window; 13-Removable flange; 14-Pressure transmitter; 15-Sealing fluid filling port; 16-LSL level switch; 17-LSH level switch; 18-T-connector; 19-Return port; 20-Vent hole; 21-Column assembly. Detailed Implementation

[0024] 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.

[0025] The core of this invention is to provide a disassembleable double-end mechanical seal system for petrochemical pipeline process pumps. This system eliminates the need for additional refrigerant delivery pipelines, simplifying the equipment and reducing costs.

[0026] It should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", and "rear" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the purpose of facilitating the description of this application and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0027] This application provides a disassembly-friendly double-end mechanical seal system for a petrochemical pipeline process pump, comprising: a pump 1 and a liquid storage tank assembly 4;

[0028] Among them, the high-pressure zone of pump 1 is provided with a first liquid outlet 2, and pump 1 is also provided with a first liquid inlet 3;

[0029] The lower end of the liquid storage tank assembly 4 is provided with a coolant inlet 5 and a coolant outlet 6. The coolant inlet 5 is connected to the first outlet 2 through a pipe, and the coolant outlet 6 is connected to the first inlet 3 through a pipe. Both the coolant inlet 5 and the coolant outlet 6 are provided with a switchable valve.

[0030] For details, please refer to the appendix. Figure 1 Pump 1 and storage tank assembly 4 are independently set up. The first outlet 2 is connected to the coolant inlet 5 of the storage tank assembly 4, and the coolant outlet 6 is connected to the first inlet 3. Since both pump 1 and storage tank assembly 4 are equipped with cavities, a closed-loop liquid passage can be formed. The high-pressure zone of pump 1 can pump coolant from the first outlet 2 into the storage tank assembly 4. At this time, the valve at the coolant inlet 5 is open and the valve at the coolant outlet 6 is closed. After the coolant is cooled in the storage tank assembly 4, the valve at the coolant outlet 6 is opened and the valve at the coolant inlet 5 is closed. The coolant flows back from the storage tank assembly 4 to the low-pressure zone in pump 1. Therefore, there is no need to set up additional cooling pipes, which simplifies the equipment structure and reduces equipment and maintenance costs. In addition, the above design will not contaminate materials and is close to zero discharge. It does not require an additional pressure source and is suitable for situations where there is no separate cooling water source.

[0031] Based on the above embodiments, the pump 1 is also provided with a second outlet 7 and a second inlet 8, and the storage tank assembly 4 is provided with a flushing liquid inlet 9 and a flushing liquid outlet 10. The second outlet 7 and the flushing liquid inlet 9 are connected by a pipe, and the second inlet 8 and the flushing liquid outlet 10 are connected by a pipe. The flushing liquid inlet 9 is located above the flushing liquid outlet 10, and the second outlet 7 is also located in the high-pressure zone of the pump 1.

[0032] For details, please refer to the appendix. Figure 1 With appendix Figure 2 The high-pressure zone of pump 1 is also equipped with a second liquid outlet 7, and the second liquid inlet 8 is located in the low-pressure zone of pump 1. Generally, the first liquid outlet 2, the first liquid inlet 3, and the second liquid outlet 7 are all selected with compression fittings and straight-through pipe joints. The liquid conveying pipeline is made of precision bright stainless steel pipe. The upper end of the liquid storage tank assembly 4 is equipped with a flushing liquid inlet 9, and the lower end is equipped with a flushing liquid outlet 10. The second liquid outlet 7, the flushing liquid inlet 9, the flushing liquid outlet 10 and the second liquid inlet 8 can form a flushing pipeline. The flushing liquid and the coolant in the flushing pipeline are the same liquid medium, which can also reduce costs.

[0033] Based on the above embodiments, the liquid storage tank assembly 4 includes a sealed tank 11 and a column assembly 21. The sealed tank 11 is equipped with a high pressure alarm device and a low liquid level alarm device. The lower end face of the column assembly 21 and the lower end face of the pump 1 are located in the same horizontal plane.

[0034] Specifically, the length of the column assembly 21 is set according to the pressure of the pump 1. The column assembly 21 can support the sealed tank 11 and lift it off the ground, creating a certain height difference between it and the pump 1. The pump 1 can introduce coolant or flushing fluid into the sealed tank 11. The liquid in the sealed tank 11 is refluxed due to gravity. In addition, a high-pressure alarm device and a low-liquid-level alarm device should be matched and installed on the outside of the sealed tank 11. Furthermore, the high-pressure alarm device and the low-liquid-level alarm device should be matched and equipped with a detection device. The detection device should be installed inside the sealed tank 11 to detect the liquid level and pressure. The pressure and liquid level data inside the sealed tank 11 can be measured through the detection component, thereby enabling early detection of leakage in the medium-side seal.

[0035] Based on the above embodiment, the sealed tank 11 is provided with a liquid level window 12 for observing the liquid level inside, and the liquid level window 12 is located above the flushing liquid inlet 9.

[0036] Specifically, a transparent liquid level window 12 is provided at the upper end of the sealed container 11. The liquid level height inside the sealed container 11 can be directly observed through the liquid level window 12. Generally, the liquid level height is divided into three types: high, normal, and low. Correspondingly, a scale can be set on the liquid level window to make it easier to confirm the liquid level. The change in the liquid level inside the sealed container 11 can be directly detected: if the liquid level drops too much, it indicates that the outer seal is leaking; if the liquid level increases, it indicates that the inner seal is leaking.

[0037] Based on the above embodiment, a removable flange 13 is provided at the top of the sealed tank 11. The removable flange 13 is used to connect the user collection system in the disassembled state and to seal the sealed tank 11 in the installed state.

[0038] Specifically, an outwardly extending pipe is provided at the top of the sealed tank 11, and a removable flange 13 is provided on the pipe. The removable flange 13 and the flange on the pipe are detachably connected. When the two are connected, the top of the sealed tank 11 can be sealed. After the two are disassembled, the flange at the top can be connected to the user collection system. Gas that leaks into the sealed tank 11 and flashes will be discharged into the user collection system, improving safety.

[0039] Based on the above embodiment, the pressure transmitter 14 between the flange 13 and the sealed tank 11 can be removed.

[0040] Specifically, the top pipe of the sealed tank 11 is a three-way pipe, and the three ends of the three-way pipe are respectively connected to the sealed tank 11, the removable flange 13 and the pressure transmitter 14. The pressure transmitter 14 can convert the pressure signal in the sealed tank 11 into a standard electrical signal, and can also amplify the small original pressure signal, which is suitable for subsequent measurement and control, and facilitates long-distance transmission and digital system processing.

[0041] Based on the above embodiment, the sealed container 11 is provided with a sealing liquid filling port 15.

[0042] Specifically, the sealing fluid filling port 15 is located on the top side of the sealed tank 11. The sealing fluid filling port 15 can maintain the pressure or liquid level stability inside the sealed tank 11, prevent harmful media from entering the sealed tank 11, and protect the internal safety of the sealed tank 11. In addition, in the double-end mechanical seal, by selecting a suitable sealing fluid, the sealing fluid filling port 15 can improve the working environment of the mechanical seal, reduce the leakage of process media, and remove the heat of the sealing cavity, thereby improving the safety and reliability of the equipment.

[0043] Based on the above embodiments, the sealed tank 11 is also equipped with an LSL level switch 16 and an LSH level switch 17.

[0044] Specifically, the LSL level switch 16 can be used to control the water level. The LSL level switch 16 has a built-in microswitch. When the liquid level rises to a certain height and the float is submerged in the liquid, the microswitch is triggered to send a control signal. The LSH level switch 17 can automatically detect the liquid level in machines and equipment that require the liquid to be full before they can start or operate, ensuring that the machine or equipment will not start when the liquid level is insufficient, thereby protecting the equipment from damage. In some cases, an excessively high liquid level can also affect the normal operation of the machine or equipment. The LSH level switch 17 can monitor the liquid level to prevent damage caused by excessively high liquid levels.

[0045] Based on the above embodiment, a three-way connector 18 is provided on the first liquid inlet 3. The other two ends of the three-way connector 18 are respectively connected to the coolant outlet 6 and the return port 19 through pipes. The second liquid outlet 7, the second liquid inlet 8 and the return port 19 are located in the same plane. An openable and controllable exhaust hole 20 is also provided in the plane.

[0046] Specifically, the first liquid inlet 3 is connected to the tee connector 18 through a stainless steel pipe. The two outer ends of the tee connector 18 are connected to the coolant outlet 6 and the return port 19 through stainless steel pipes, respectively. The function of the return port 19 is to return the coolant or flushing fluid to the inner mechanical seal.

[0047] Based on the above embodiment, pump 1 is provided with a double-end mechanical seal.

[0048] Specifically, a double-end mechanical seal is designed according to the size of pump 1. This double-end mechanical seal can be installed and replaced without changing the overall installation size of the pump or replacing large parts, which can reduce costs for users when replacing the pump or pump parts.

[0049] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0050] The present invention provides a detailed description of a disassembly-friendly double-end mechanical seal system for a petrochemical pipeline process pump. Specific examples have been used to illustrate the principles and implementation methods of the invention. These examples are merely illustrative and are intended to aid in understanding the method and core concepts of the invention. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. A disassembly-friendly double-end mechanical seal system for petrochemical pipeline process pumps, characterized in that, include: The pump (1) has a first outlet (2) in its high-pressure zone and a first inlet (3) on the pump (1). The liquid storage tank assembly (4) has a coolant inlet (5) and a coolant outlet (6) at its lower end. The coolant inlet (5) is connected to the first outlet (2) through a pipe, and the coolant outlet (6) is connected to the first inlet (3) through a pipe. Both the coolant inlet (5) and the coolant outlet (6) are equipped with a switchable valve.

2. The easily disassembled double-end mechanical seal system for petrochemical pipeline process pumps according to claim 1, characterized in that, The pump (1) is also provided with a second outlet (7) and a second inlet (8). The storage tank assembly (4) is provided with a flushing liquid inlet (9) and a flushing liquid outlet (10). The second outlet (7) is connected to the flushing liquid inlet (9) through a pipe. The second inlet (8) is connected to the flushing liquid outlet (10) through a pipe. The flushing liquid inlet (9) is located above the flushing liquid outlet (10). The second outlet (7) is also located in the high-pressure zone of the pump (1).

3. The easily disassembled petrochemical pipeline process pump double-end mechanical seal sealing system according to claim 2, characterized in that, The liquid storage tank assembly (4) includes a sealed tank (11) and a column assembly (21). The sealed tank (11) is equipped with a high pressure alarm device and a low liquid level alarm device. The lower end face of the column assembly (21) and the lower end face of the pump (1) are located in the same horizontal plane.

4. The easily disassembled double-end mechanical seal system for petrochemical pipeline process pumps according to claim 3, characterized in that, The sealed container (11) is provided with a liquid level window (12) for observing the liquid level inside, and the liquid level window (12) is located above the flushing liquid inlet (9).

5. The easily disassembled double-end mechanical seal system for petrochemical pipeline process pumps according to claim 4, characterized in that, The top of the sealed container (11) is provided with a removable flange (13). The removable flange (13) is used to connect the user collection system in the detached state and to seal the sealed container (11) in the installed state.

6. The easily disassembled double-end mechanical seal system for petrochemical pipeline process pumps according to claim 5, characterized in that, A pressure transmitter (14) is provided between the removable flange (13) and the sealed tank (11).

7. The easily disassembled double-end mechanical seal system for petrochemical pipeline process pumps according to claim 6, characterized in that, The sealed container (11) is provided with a sealing liquid filling port (15).

8. The easily disassembled double-end mechanical seal system for petrochemical pipeline process pumps according to claim 7, characterized in that, The sealed tank (11) is also equipped with an LSL level switch (16) and an LSH level switch (17).

9. The easily disassembled double-end mechanical seal system for petrochemical pipeline process pumps according to any one of claims 2 to 8, characterized in that, The first liquid inlet (3) is provided with a three-way connector (18), and the other two ends of the three-way connector (18) are respectively connected to the coolant outlet (6) and the return port (19) through pipes. The second liquid outlet (7), the second liquid inlet (8) and the return port (19) are located in the same plane, and the plane is also provided with an openable and controllable exhaust hole (20).

10. The easily disassembled double-end mechanical seal system for petrochemical pipeline process pumps according to claim 9, characterized in that, The pump (1) is equipped with a double-end mechanical seal.

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