Pumping system capable of achieving mechanical seal leakage monitoring

Abstract

The utility model discloses a pumping system capable of realizing mechanical seal leakage monitoring, which comprises a motor (1), a vertical pump body (2) and a pump head (3), the outlet end of the pump head (3) is connected with a liquid outlet pipeline (4), and the pumping system is characterized in that the outlet end of the liquid outlet pipeline (4) is connected with the inlet end of a check valve (5), a first mechanical seal (6) is arranged at the joint of the vertical pump body (2) and the pump head (3), and a second mechanical seal (7) is arranged at the outlet end of the check valve (5). An impeller is arranged in the pump head (3), a second mechanical seal (7) is arranged on the upper portion of a hub of the impeller, a monitoring pipeline (23) is arranged in the vertical pump body (2), the height of a bottom opening of the monitoring pipeline (23) is between the height of the first mechanical seal (6) and the height of the second mechanical seal (7), and the height of a top opening of the monitoring pipeline (23) is larger than that of the first mechanical seal (6).

Description

Technical Field

[0001] The utility model relates to the field of leakage control and treatment of mechanical seals for pumps, in particular to a pumping system capable of realizing mechanical seal leakage monitoring. Background Art

[0002] A pump is a machine used to transport or pressurize fluids. It transfers the mechanical energy of a prime mover or other external energy to the liquid, increasing the fluid's energy. It primarily transports fluids such as water, oil, acids and alkalis, emulsions, suspensions, and liquid metals. A wide variety of pumps are used in a variety of fields, including urban water supply, sewage systems, power generation, chemical systems, mining and metallurgy, shipbuilding, and aerospace.

[0003] The sealing structure or sealing component is an important part of the pump, especially when conveying toxic and harmful media, high-temperature and explosive media, media that react violently with air, etc., it is particularly important to maintain the sealing of the pump body during operation.

[0004] After a pump with a sealed structure has been operating for a period of time, the risk of seal leakage gradually increases. This is especially true when the pump is pumping a medium with a high content of solid particles, which can cause excessive wear and tear on the pump's mechanical seal, leading to leakage. When pumping toxic, volatile, flammable, or explosive fluids, seal leakage can pose a safety hazard. If not discovered in time, a leak can lead to a safety accident.

[0005] Traditional pump leakage control systems require modifications to the original pump seal assembly structure or can only be installed between the prime mover and the pump body, making it impossible to promptly control leaks. Traditional electronically controlled valves cannot operate normally after a power outage, requiring personnel to manually close the valve at the leak site. Alternatively, the valve motor must be equipped with an explosion-proof battery as a backup power source to ensure normal operation and drive the valve to close in the event of a power outage. However, explosion-proof batteries are expensive and require regular maintenance. Furthermore, if the valve motor is activated during a seal leak, it can easily ignite and explode the conveying medium.

[0006] Therefore, a method or device that can solve the above problems is needed. Summary of the Invention

[0007] The utility model aims to solve the above-mentioned deficiencies in the prior art and proposes a pumping system which has a simple structure, ingenious design, reasonable layout and wide applicability, can be installed and used without changing the original pump sealing structure, and can detect and deal with seal leakage in a timely manner to achieve the purposes of reducing leakage losses and improving the safety of pump use, etc., which can realize mechanical seal leakage monitoring.

[0008] The technical solution of the utility model is: a pumping system capable of realizing mechanical seal leakage monitoring, comprising a motor 1, a vertical pump body 2 and a pump head 3, the outlet end of the pump head 3 is connected to a liquid outlet pipeline 4, characterized in that the outlet end of the liquid outlet pipeline 4 is connected to the inlet end of a check valve 5,

[0009] A first mechanical seal 6 is provided at the connection between the vertical pump body 2 and the pump head 3. An impeller is provided in the pump head 3. A second mechanical seal 7 is provided on the upper part of the impeller hub. A monitoring pipeline 23 is provided in the vertical pump body 2. The bottom opening of the monitoring pipeline 23 is located between the first mechanical seal 6 and the second mechanical seal 7, and the top opening of the monitoring pipeline 23 is higher than the first mechanical seal 6.

[0010] A light source 8 and a photoresistor 9 are provided in the vertical pump body 2. The top of the monitoring pipe 23 is a transparent section, which is located between the light source 8 and the photoresistor 9. A float 10 is provided in the transparent section. An AC contactor 11 is provided in the circuit where the photoresistor 9 is located. The light source 8 and the photoresistor 9 are both controlled by a PLC module 12.

[0011] The check valve 5 is provided with a valve core 13, and the top of the valve core 13 is connected to the valve core shaft 14. The top of the valve core shaft 14 is connected to the bottom end of the damping piston 15. The damping piston 15 is movably connected in the control housing 16. The control housing 16 is located at the top of the check valve 5. A spring guide groove 17 is provided at the top of the control housing 16. An electromagnet 18 is provided inside the spring guide groove 17. A spring tray 19 movably connected to the control housing 16 is provided below the spring guide groove 17. When the electromagnet 18 is energized and exhibits magnetism, the spring tray 19 will engage with the spring guide groove 17 under the action of the magnetic force. A spring 20 is provided in the interlayer opened in the side walls of the spring guide groove 17 and the spring tray 19.

[0012] The spring tray 19 is located above the damping piston 15. An upper buffer pad 21 is provided on the top surface of the damping piston 15. A lower buffer pad 22 is provided on the bottom of the control housing 16 and is located below the damping piston 15.

[0013] The electromagnet 18 is also controlled by the PLC module 12 .

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] This pumping system for monitoring mechanical seal leakage features a simple structure, ingenious design, and rational layout. Addressing the various issues inherent in conventional pump seal leakage control systems, this unique design replaces the existing leak detection device, which requires modification of the seal structure or is located between the prime mover and the pump body, with a universal detection pipeline applicable to all pumps with sealed cavities. This improves applicability and the speed of seal leakage detection. Furthermore, since it only requires connection to the sealed cavity, requiring no modification of the existing seal structure or system configuration, it has a wide range of applications and does not affect the performance and characteristics of the existing pump seal system. Furthermore, this detection pipeline is simple to install, utilizing the flushing and detection holes of the existing seal housing. Furthermore, the longer detection pipeline reduces the impact of leaking liquid on other pump components in the event of a seal leak. Furthermore, the system circuit operates normally when powered on, and can also maintain safety control actions such as power-off and closing the discharge pipeline in the event of circuit failures such as voltage fluctuations or power outages. Furthermore, the key detection mechanism is mechanical, simple, safe, and reliable, and the electronic control unit is completely isolated from the pumped medium, ensuring stable operation and unaffected by the medium. Therefore, it can be said that it has many advantages, is particularly suitable for promotion and application in this field, and has a very broad market prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the present utility model.

[0017] Figure 2 It is a cross-sectional view of the check valve portion in an embodiment of the present utility model.

[0018] Figure 3 It is a cross-sectional view of the control housing portion in an embodiment of the present utility model. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention will be described below with reference to the accompanying drawings. Figures 1 to 3 As shown: A pumping system capable of realizing mechanical seal leakage monitoring includes a motor 1, a vertical pump body 2 and a pump head 3. The outlet end of the pump head 3 is connected to a liquid outlet pipeline 4, and the outlet end of the liquid outlet pipeline 4 is connected to the inlet end of a check valve 5.

[0020] A first mechanical seal 6 is provided at the connection between the vertical pump body 2 and the pump head 3. An impeller is provided in the pump head 3. A second mechanical seal 7 is provided on the upper part of the impeller hub. A monitoring pipeline 23 is provided in the vertical pump body 2. The bottom opening of the monitoring pipeline 23 is located between the first mechanical seal 6 and the second mechanical seal 7, and the top opening of the monitoring pipeline 23 is higher than the first mechanical seal 6.

[0021] A light source 8 and a photoresistor 9 are provided in the vertical pump body 2. The top of the monitoring pipe 23 is a transparent section, which is located between the light source 8 and the photoresistor 9. A float 10 is provided in the transparent section. An AC contactor 11 is provided in the circuit where the photoresistor 9 is located. The light source 8 and the photoresistor 9 are both controlled by a PLC module 12.

[0022] The check valve 5 is provided with a valve core 13, and the top of the valve core 13 is connected to the valve core shaft 14. The top of the valve core shaft 14 is connected to the bottom end of the damping piston 15. The damping piston 15 is movably connected in the control housing 16. The control housing 16 is located at the top of the check valve 5. A spring guide groove 17 is provided at the top of the control housing 16. An electromagnet 18 is provided inside the spring guide groove 17. A spring tray 19 movably connected to the control housing 16 is provided below the spring guide groove 17. When the electromagnet 18 is energized and exhibits magnetism, the spring tray 19 will engage with the spring guide groove 17 under the action of the magnetic force. A spring 20 is provided in the interlayer opened in the side walls of the spring guide groove 17 and the spring tray 19.

[0023] The spring tray 19 is located above the damping piston 15. An upper buffer pad 21 is provided on the top surface of the damping piston 15. A lower buffer pad 22 is provided on the bottom of the control housing 16 and is located below the damping piston 15.

[0024] The electromagnet 18 is also controlled by the PLC module 12 .

[0025] The working process of the pumping system capable of realizing mechanical seal leakage monitoring of the embodiment of the present utility model is as follows: Under normal working conditions, the first mechanical seal 6 and the second mechanical seal 7 are both in normal working conditions, the medium pumped by the system is sucked in from the inlet of the pump head 3, and after being pressurized, enters the liquid outlet pipeline 4 from the outlet end, the check valve 5 at the end of the liquid outlet pipeline 4 is in a normally open state, and the medium is discharged through the outlet of the check valve 5;

[0026] In this state, the light emitted by the light source 8 will pass through the transparent section and illuminate the photoresistor 9, and the PLC module 12 will thereby determine that there is no leakage problem in the pumping system.

[0027] If leakage occurs, since the second mechanical seal 7 is closer to the pressure gauge than the first mechanical seal 6, the second mechanical seal 7 will definitely leak earlier than the first mechanical seal 6. At this time, the chamber between the first mechanical seal 6 and the second mechanical seal 7 is filled with a medium with a certain pressure. This part of the medium will enter the monitoring pipeline 23 from the opening at the bottom of the monitoring pipeline 23 and push the float 10 to rise. When the float 10 rises to the transparent section at the top of the monitoring pipeline 23, it will block the light emitted by the light source 8. After being affected, the resistance value of the photoresistor 9 changes. After receiving the signal, the PLC module 12 determines that a leakage problem has occurred in the pumping system and controls the pump to stop working.

[0028] After the pump stops working, the electromagnet 18 loses power, and the spring 20, which was originally in a compressed state, releases its elastic force, pushing the spring tray 19 downward. The spring tray 19 pushes the damping piston 15, the valve core shaft 14, and the valve core 13 downward together. Under the action of the damping spring 15, the above movement is relatively slow, which can prevent the backflow of liquid in the liquid outlet pipe from causing the impeller to reverse and fall off, protect the pump body structure, and prevent the pipeline from being damaged by impact. It will not cause any impact on the various mechanisms inside the check valve 5. When the valve core 13 blocks the opening at the bottom of the check valve 5, the check valve 5 is closed;

[0029] After the leakage fault is eliminated, the water in the monitoring pipeline 23 is drained and the float 10 returns to the low position; at the same time, the electromagnet 18 is energized again and exhibits magnetism. Under the action of the magnetic force, the spring tray 19 moves upward and the spring 20 also returns to the compressed state; after the pressure of the spring 20 is lost, when the pump body is started next time, the pressurized medium will push the valve core 13 and the valve core shaft 14 to move upward, and the check valve 5 will open to realize normal pumping of the medium.

Claims

1. A pumping system capable of monitoring mechanical seal leakage, comprising a motor (1), a vertical pump body (2) and a pump head (3), wherein the outlet end of the pump head (3) is connected to a liquid outlet pipeline (4), and is characterized in that: The outlet end of the liquid outlet pipeline (4) is connected to the inlet end of the check valve (5). A first mechanical seal (6) is provided at the connection between the vertical pump body (2) and the pump head (3), an impeller is provided in the pump head (3), a second mechanical seal (7) is provided on the upper part of the impeller hub, and a monitoring pipeline (23) is provided in the vertical pump body (2). The height of the bottom opening of the monitoring pipeline (23) is located between the first mechanical seal (6) and the second mechanical seal (7), and the height of the top opening of the monitoring pipeline (23) is higher than the first mechanical seal (6). A light source (8) and a photoresistor (9) are provided in the vertical pump body (2). The top of the monitoring pipeline (23) is a transparent section, which is located between the light source (8) and the photoresistor (9). A float (10) is provided in the transparent section. An AC contactor (11) is provided in the circuit where the photoresistor (9) is located. The light source (8) and the photoresistor (9) are both controlled by a PLC module (12). The check valve (5) is provided with a valve core (13), the top of the valve core (13) is connected to a valve core shaft (14), the top of the valve core shaft (14) is connected to the bottom of the damping piston (15), and the damping piston (15) is movably connected in the control housing (16). The control housing (16) is located at the top of the check valve (5). A spring guide groove (17) is provided at the top of the control housing (16), an electromagnet (18) is provided inside the spring guide groove (17), and a spring tray (19) movably connected in the control housing (16) is provided below the spring guide groove (17). When the electromagnet (18) is energized and exhibits magnetism, the spring tray (19) will be engaged with the spring guide groove (17) under the action of the magnetic force, and a spring (20) is provided in the interlayer opened in the side walls of the spring guide groove (17) and the spring tray (19). The spring tray (19) is located above the damping piston (15), and an upper buffer pad (21) is provided on the top surface of the damping piston (15). The bottom of the control housing (16) is also provided with a lower buffer pad (22) located below the damping piston (15). The electromagnet (18) is also controlled by the PLC module (12).

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