Intelligent sealing and purging system for high-temperature molten salt pump

Abstract

The utility model relates to an intelligent sealing purging system of high temperature molten salt pump, include: the seat of spitting, packing seal part, motor support, molten salt pump motor, fan terminal box, linkage circuit, solenoid valve pressure transmitter, nitrogen purging pipeline, packing seal part fixed mounting is on the seat of spitting, and the lower extreme of motor support is connected with the seat of spitting, and the upper extreme of motor support is connected with molten salt pump motor, and the pipeline between nitrogen purging pipeline entrance and packing part is equipped with pressure transmitter and solenoid valve, and simultaneously the coil terminal of solenoid valve is connected through linkage circuit and is accessed on the AC 220V power line of fan terminal box of molten salt pump motor, and pressure transmitter is connected with monitor and alarm, the automatic purging system of the utility model model is linked with the state of molten salt pump motor, has realized the accurate start -stop control of purging nitrogen, and has promoted security and energy efficiency.

Description

Technical Field

[0001] This utility model relates to a purging system, specifically an intelligent sealed purging system for high-temperature molten salt pumps that enables precise start-stop control of purging nitrogen, improves safety and energy efficiency, and reduces frequent manual operation and the risk of misoperation. Background Technology

[0002] A high-temperature molten salt pump is a submersible pump that is immersed in a high-temperature molten salt medium. It is widely used in solar thermal molten salt energy storage systems and other high-temperature operating conditions.

[0003] Due to the special operating conditions involving high-temperature media, shaft seals typically employ packing gas combined with nitrogen purging to achieve sealing of the high-temperature media, blocking heat transfer and ensuring the safe and stable operation of the pump. Therefore, the start-stop control of nitrogen purging plays a crucial role in the safe and stable operation of the pump. This utility model relates to the field of molten salt pump sealing technology, and particularly to a molten salt pump sealing purging system based on solenoid valve linkage and its automated control method, applicable to high-temperature molten salt systems, solar thermal power generation, chemical reaction equipment, and other scenarios.

[0004] Figure 1 This is a schematic diagram of a commonly used seal purging system. From... Figure 1 As can be seen, the original high-temperature molten salt pump sealing purging system mainly includes: a discharge seat 1', a packing seal component 2', a motor bracket 3', a molten salt pump motor 4', a manual valve 5', and a nitrogen purging pipeline 6'. The packing seal component 2' is fixedly installed on the discharge seat 1', the lower end of the motor bracket 3' is connected to the discharge seat, and the upper end of the motor bracket 3' is connected to the molten salt pump motor 4'. A manual valve 5' is installed on the pipeline between the nitrogen inlet and the packing seal component 2', and the purging volume of nitrogen is controlled by adjusting the manual valve 5'.

[0005] In traditional sealing purging systems, a manual valve 5' is installed on the pipeline between the nitrogen inlet and the packing seal component 2'. The amount of nitrogen purging is controlled by manually starting and stopping the purging process. This purging method has the following drawbacks:

[0006] 1. Delayed manual operation can easily lead to nitrogen waste after shutdown;

[0007] 2. During operation, molten salt splashes into the gap between the packing labyrinth groove and the shaft sleeve. After the pump is stopped, the nitrogen purging valve is not closed in time, which causes crystallization in the gap and causes the pump to jam.

[0008] 3. Frequent pump start-ups and shutdowns are cumbersome and increase the risk of misoperation;

[0009] 4. Lack of real-time linkage with pump operating status, resulting in insufficient safety. Utility Model Content

[0010] To address the aforementioned problems, the main objective of this invention is to provide an intelligent sealed purging system for high-temperature molten salt pumps that enables precise start-stop control of purging nitrogen, improves safety and energy efficiency, and reduces frequent manual operation and the risk of misoperation.

[0011] This utility model solves the above-mentioned technical problems through the following technical solution: an intelligent sealing and purging system for a high-temperature molten salt pump, comprising: a discharge seat, a packing seal component, a motor bracket, a molten salt pump motor, a fan junction box, a linkage circuit, a solenoid valve pressure transmitter, and a nitrogen purging pipeline; the packing seal component is fixedly installed on the discharge seat, the lower end of the motor bracket is connected to the discharge seat, and the upper end of the motor bracket is connected to the molten salt pump motor; a pressure transmitter and a solenoid valve are installed on the pipeline between the inlet of the nitrogen purging pipeline and the packing component, and the coil terminal of the solenoid valve is connected to the AC 220V power supply line of the fan junction box of the molten salt pump motor through the linkage circuit; the pressure transmitter is connected to a monitor and an alarm.

[0012] In a specific embodiment of this utility model, the solenoid valve is linked to the power supply of the molten salt pump motor, and the power on / off signal directly drives the solenoid valve to open and close, thereby realizing the automatic start and stop control of the purging nitrogen.

[0013] In a specific embodiment of this utility model, the monitor is a detector internally controlled by a PLC.

[0014] In a specific embodiment of this utility model, when the purging pressure is detected to be lower than 0.2 MPa or higher than 0.5 MPa, the PLC forcibly closes the solenoid valve and triggers an alarm.

[0015] The positive and progressive effects of this utility model are as follows: The intelligent sealing and purging system for high-temperature molten salt pumps provided by this utility model has the following advantages:

[0016] This invention involves installing a solenoid valve on the nitrogen purging pipeline and connecting the solenoid valve coil terminals in parallel to the power supply line of the molten salt pump motor fan junction box to ensure the synchronization of the solenoid valve and the motor's start and stop. Simultaneously, a pressure transmitter is added at the inlet of the nitrogen purging pipeline, and the signal is connected to a PLC to monitor the purging pressure. When the detected purging pressure is below 0.2 MPa or above 0.5 MPa, the PLC forcibly closes the solenoid valve and triggers an alarm.

[0017] The automatic purging system in this invention, which is linked to the status of the molten salt pump motor, enables precise start-stop control of the purging nitrogen, thereby improving safety and energy efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a commonly used sealing purging system.

[0019] Figure 2This is a schematic diagram of the overall structure of this utility model.

[0020] The following are the names corresponding to the reference numerals in this utility model:

[0021] Figure 1 In the middle: Discharge seat 1', packing seal component 2', motor bracket 3', molten salt pump motor 4', manual valve 5', nitrogen purging pipeline 6'.

[0022] Figure 2 In the middle: 1. Discharge seat, 2. Packing seal component, 3. Motor bracket, 4. Molten salt pump motor, 5. Fan junction box, 6. Linkage circuit, 7. Solenoid valve, 8. Pressure transmitter, 9. Nitrogen purging pipeline. Detailed Implementation

[0023] The preferred embodiments of this utility model are given below with reference to the accompanying drawings to illustrate the technical solution of this utility model in detail.

[0024] Figure 2 This is a schematic diagram of the overall structure of the present invention, as shown below. Figure 2 As shown: This utility model provides an intelligent sealing and purging system for a high-temperature molten salt pump. The system includes: a discharge seat 1, a packing seal component 2, a motor bracket 3, a molten salt pump motor 4, a fan junction box 5, a linkage circuit 6, a solenoid valve 7, a pressure transmitter 8, and a nitrogen purging pipeline 9. The packing seal component 2 is fixedly installed on the discharge seat 1. The lower end of the motor bracket 3 is connected to the discharge seat, and the upper end of the motor bracket 3 is connected to the molten salt pump motor 4. A pressure transmitter 8 and a solenoid valve 7 are installed on the pipeline between the inlet of the nitrogen purging pipeline 9 and the packing component 2. The coil terminal of the solenoid valve 7 is connected to the AC 220V power supply line of the fan junction box 5 of the molten salt pump motor 4 via the linkage circuit 6. The pressure transmitter 8 is connected to a monitor and an alarm. The monitor is an internally PLC-controlled detector.

[0025] The solenoid valve 7 is linked to the molten salt pump motor 4 by power supply. The power on / off signal directly drives the solenoid valve 7 to open and close, thereby realizing the automatic start and stop control of the purging nitrogen.

[0026] This invention involves installing a solenoid valve on the nitrogen purging pipeline and connecting the solenoid valve coil terminals in parallel to the power supply line of the molten salt pump motor fan junction box to ensure the synchronization of the solenoid valve and the motor's start and stop. Simultaneously, a pressure transmitter is added at the inlet of the nitrogen purging pipeline, and the signal is connected to a PLC to monitor the purging pressure. When the detected purging pressure is below 0.2 MPa or above 0.5 MPa, the PLC forcibly closes the solenoid valve and triggers an alarm.

[0027] This automatic purging system, which is linked to the status of the molten salt pump motor, enables precise start-stop control of the purging nitrogen, improving safety and energy efficiency.

[0028] This invention effectively avoids the defects exposed by the original system. The system solves the problems of low efficiency and poor safety of manual operation. It is particularly suitable for molten salt pumps that are frequently started and stopped, and has significant energy-saving and safety benefits.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. An intelligent sealing and purging system for a high-temperature molten salt pump, characterized in that: The intelligent sealing and purging system for the high-temperature molten salt pump includes: a discharge seat, a packing seal component, a motor bracket, a molten salt pump motor, a fan junction box, a linkage circuit, a solenoid valve, a pressure transmitter, and a nitrogen purging pipeline. The packing seal component is fixedly installed on the discharge seat. The lower end of the motor bracket is connected to the discharge seat, and the upper end of the motor bracket is connected to the molten salt pump motor. A pressure transmitter and a solenoid valve are installed on the pipeline between the nitrogen purging pipeline inlet and the packing component. The coil terminal of the solenoid valve is connected to the AC 220V power supply line of the fan junction box of the molten salt pump motor through the linkage circuit. The pressure transmitter is connected to a monitor and an alarm.

2. The intelligent sealing and purging system for high-temperature molten salt pumps according to claim 1, characterized in that: The solenoid valve is linked to the molten salt pump motor power supply. The power on / off signal directly drives the solenoid valve to open and close, thereby achieving automatic start and stop control of the purging nitrogen.

3. The intelligent sealing and purging system for high-temperature molten salt pumps according to claim 1, characterized in that: The monitor is a detector internally controlled by a PLC.

4. The intelligent sealing and purging system for high-temperature molten salt pumps according to claim 3, characterized in that: When the purging pressure is detected to be lower than 0.2 MPa or higher than 0.5 MPa, the PLC forcibly closes the solenoid valve and triggers an alarm.

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