CN104696266A - Liquid metal pool type driving device sealing assembly - Google Patents

Abstract

The invention discloses a sealing assembly of a liquid metal pool driving device, in particular to a sealing assembly of a pump box of a liquid metal pool driving device which transports high temperature and has high sealing requirements. An ordinary vertical mechanical pump is fixed on the pump through a flange. On the box, all parts at the upper end of the pump flange are sealed in a sealed cover, the impeller and support part of the pump body are submerged in the liquid metal being transported, a certain free liquid surface is left in the pump box, and the upper part of the free liquid surface is filled with a slight positive pressure Inert protective gas, so that the sealed liquid heavy metal can be transformed into a sealed protective gas, and then the dynamic sealed protective gas at the shaft seal can be transformed into a static seal between the pump connection flanges. The end cover of the seal cover is equipped with power and signal lead wires Connecting terminals, connecting terminals adopt spark plugs, and a circulating cooling water jacket is arranged in the circumferential direction of the sealing cover, which is used to cool the heat generated by the motor and bearings in the sealing cover, so as to ensure the safe and stable operation of the vertical mechanical pump for a long time.

Description

A sealing component of a liquid metal pool driving device

technical field

The invention relates to a novel sealing assembly of a liquid metal pool driving device, in particular to a sealing assembly of a pump box of a liquid metal pool driving device which transports high temperature and has high sealing requirements.

Background technique

At present, the power components used for liquid metal drive mainly include mechanical pumps, electromagnetic pumps and gas lift pumps. The electromagnetic pump has no dynamic seal and has high sealing performance. Gas lift pumps use gas injection to avoid wear and corrosion of mechanical wetted parts. However, the efficiency of electromagnetic pumps and air lift pumps is low, and the flow and pressure head they can provide are relatively limited. Therefore, they are generally used in occasions that have high requirements for leakage, wear and corrosion, and low requirements for flow and pressure head. The cost is relatively high. Mechanical pumps can provide higher flow and pressure head, but mechanical pumps are prone to leakage due to the use of dynamic seals. If they are used in occasions that require high leakage, a set of sealing devices must be specially designed. The design of the sealing device, Manufacturing and operation and maintenance costs are high.

Contents of the invention

The sealing assembly of the liquid metal pool driving device involved in the present invention is a sealing assembly of the pool driving device, the ordinary vertical mechanical pump is fixed on the pump box through the flange, the upper part of the pump flange is sealed in a sealing cover, and the pump The body impeller and supporting part are submerged in the liquid metal being transported, and there is a certain free liquid surface in the pump box, and the upper part of the free liquid surface is filled with a micro positive pressure inert protective gas, so that the sealed liquid heavy metal can be transformed into a sealed micro positive pressure protective gas , and then change the dynamic sealing micro-positive pressure protective gas into a static sealing.

The technical solution adopted by the present invention to solve the technical problem is: a liquid metal pool type driving device sealing assembly, including a liquid metal injection system, a stop valve, a pump box sealing assembly, an emptying valve and a storage tank; the pump box sealing assembly includes Pump box, vertical mechanical pump, sealing cover, sealing cover end cover, circulating cooling water jacket, cooling water inlet, cooling water outlet, sealing cover connecting flange, pump box flange, liquid metal inlet, emptying pipe, baffle Plate, pump box inert gas inlet pipe, sealing cover inert gas inlet pipe, terminal block. The vertical mechanical pump includes a shaft seal assembly, a pump body, a pump inlet, a pump outlet, and a pump connection flange. There is a pump connecting flange on the pump box. The vertical mechanical pump and the sealing cover are installed on the pump connecting flange. The vertical mechanical pump is located in the sealing cover. The parts of the shaft seal assembly are sealed in the seal cover, which changes the shaft seal assembly of the vertical mechanical pump from a dynamic seal to a static seal between the flange on the seal cover and the pump connection flange, and realizes the complete zero leakage of the vertical mechanical pump . The upper end of the sealing cover is the end cover of the sealing cover, and the two are connected and sealed by threads and gaskets. The end cover of the sealing cover is provided with terminals, mainly the terminals for the power supply and signal lead wire of the vertical mechanical pump. The terminals use spark plugs and are sealed. A circulating cooling water jacket is arranged in the circumferential direction of the cover to cool the heat generated by the motor and bearings in the sealed cover to ensure the safe and long-term stable operation of the vertical mechanical pump.

Wherein, the sealing cover in the pump box sealing assembly is a cylindrical structure, the upper end of the sealing cover is sealed by the end cover of the sealing cover, and a circulating cooling water jacket is arranged in the circumferential direction of the sealing cover.

Wherein, signal lead-out terminals are arranged on the end cover of the seal cover in the pump box seal assembly, and the signal lead-out terminals are spark plugs.

Principle of the present invention is:

A sealing assembly of a liquid metal pool driving device, comprising a liquid metal injection system, a pump box, a sealing cover, a vertical mechanical pump, and a storage tank. The liquid metal injection system is connected to the inlet of the pump box. The pump box is an open pump box with a flange interface on the upper end. The ordinary vertical mechanical pump is connected to the pump box flange through the flange. A high temperature resistant O The pump body at the lower end of the pump is completely immersed in the transported liquid metal, including the impeller, pump casing, guide vane, lower end sliding bearing and part of the pump shaft. The sliding bearing immersed in the liquid metal uses the The transported liquid metal is cooled and lubricated. The liquid metal in the pump box does not completely fill the entire pump box. It is necessary to reserve a part of the space between the pump box flange and the pump box liquid level. This space is filled with a slightly positive pressure inert protective gas, generally For argon gas, the pump shaft seal is set on the upper part of the pump flange, using ordinary easy-to-replace packing seals, using the static pressure of the liquid itself to seal the liquid metal that leaks upward through the back of the impeller, and the pump shaft seal changes from sealing liquid metal to sealing Slight positive pressure inert protective gas, the upper part of the pump connecting flange is completely sealed in a sealing cover, the sealing cover is connected to the pump flange through the flange, and the O-ring or metal gasket is used to seal the two flanges. The cover is filled with the same inert protective gas as that in the pump box, and its gas pressure is slightly higher than the gas pressure in the pump box, which can ensure that the protective gas in the pump box will not leak to the upper end of the flange through the shaft seal, and at the same time change the dynamic seal of the pump For the static sealing of the sealing cover to ensure that the sealing reaches zero leakage, an annular cooling water jacket is arranged in the circumferential direction of the sealing cover, and the circulating cooling water is connected outside to take away the heat generated by the motor and bearing parts in the sealing cover in time to ensure the stable and reliable operation of the liquid metal pump .

The advantages of the present invention are:

(1) The present invention fixes the mechanical pump on the pump box through the flange, the mechanical pump pump body and the impeller parts are immersed in the liquid metal of the main container, the mechanical pump shaft seal is installed on the upper end of the main container, and there is no need to install sealing parts in the pump body, At the same time, the cavitation phenomenon of the impeller is avoided.

(2) In the present invention, a portion of the space reserved from the liquid metal in the pump box to the top cover of the main container is filled with a slightly positive pressure inert protective gas, and the shaft seal seal liquid heavy metal is converted into a sealed micro positive pressure inert protective gas.

(3) The flange upper part of the mechanical pump of the present invention is sealed in a sealing cover, and the dynamic sealing of sealing the micro-positive pressure inert protective gas is changed into a static sealing relying on the sealing cover.

(4) The outlet height of the emptying pipe in the pump box of the present invention is higher than the highest liquid level of the storage tank, and the liquid metal can be emptied into the storage tank by gravity. An electric stop valve is arranged at the lower end of the emptying pipe of the main container assembly. The valve can be opened automatically in case of a situation, and the liquid metal can be safely evacuated.

Description of drawings

Fig. 1 is a flow chart of a sealing assembly of a liquid metal pool driving device according to the present invention.

Fig. 2 is a structure diagram of a sealing assembly of a liquid metal pool driving device according to the present invention.

In Figure 1-2: 1. Liquid metal injection system, 2. Globe valve, 3. Pump box seal assembly, 4. Pump box, 5. Vertical mechanical pump, 6. Seal cover, 7. Empty valve, 8. Storage tank, 9. Sealing cover end cover, 10. Circulating cooling water jacket, 11. Cooling water inlet, 12. Cooling water outlet, 13. Shaft seal assembly, 14. Sealing cover connecting flange, 15. Pump body, 16. Pump inlet, 17. Pump outlet, 18. Pump box flange, 19. Liquid metal inlet, 20. Evacuation pipe, 21. Baffle, 22 Pump box inert gas inlet pipe, 23. Seal cover inert gas inlet pipe, 24. Liquid metal liquid level, 25. Pump connection flange, 26. Wiring terminal.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1-2, the liquid metal injection system 1 is connected to the pump box seal assembly 3 through the main pipeline, and the liquid metal flows into the pump box seal assembly 3 through the injection system 1, and the vertical mechanical pump in the pump box seal assembly 3 The pump body 15 of 5 is partly submerged in the liquid metal in the pump box 4, and the liquid metal flows into the pipeline or container to be transported through the pump outlet 16 under the drive of the vertical mechanical pump 5. The lower end of the pump box is connected to the storage tank 8 through an emptying pipe. An emptying valve 7 is provided between the pump box sealing assembly 3 and the storage tank. The emptying valve 7 is generally an electric stop valve. The outlet of the emptying pipe at the lower end of the pump box sealing assembly 3 The height is higher than the maximum liquid level of the storage tank. When shutting down or in an emergency state, the electric stop valve 7 is opened, and the liquid metal can be naturally emptied into the storage tank 8 by gravity to complete the safe emptying of the liquid metal.

The pump box sealing assembly 3 has a pump box 4, a vertical mechanical pump 5 and a sealing cover 6. The side of the pump box 4 has a liquid metal inlet 19, a baffle plate 21, and an emptying pipe 20 below. The pump box 4 is an open structure at the upper end. , the upper end has a pump box flange 18, and the pump box flange 18 is connected with a pump box inert gas inlet 22. The vertical mechanical pump 5 is installed on the pump box through the pump connecting flange 14, and is connected with the pump box flange 18. The pump body 15 of the vertical mechanical pump 5 is partially immersed in the liquid metal in the pump box, and the pump box 4 A certain vertical distance is reserved between the inner liquid metal liquid level surface 24 and the pump box flange 18. This space is filled with a slightly positive pressure inert protective gas, which flows into the pump box through the pump box inert gas inlet pipe 22. The vertical mechanical pump 5 The shaft seal assembly adopts packing seal. When the vertical mechanical pump 5 is working, the pump shaft seal assembly 13 only needs to seal the slightly positive pressure inert gas in the pump box, and transform the sealed liquid metal in the vertical mechanical pump 5 into a sealed micro positive pressure. pressure inert protective gas.

The parts above the pump connecting flange 25 in the vertical mechanical pump 5 are all sealed in the sealing cover 6, and the sealing cover 6 is connected with the pump connecting flange 25 with a threaded hole through the sealing cover flange 14, and the sealing cover 6 passes through the sealing cover 6. The inert gas inlet pipe of the cover introduces the same inert gas as that in the pump box, and its pressure is slightly higher than the pressure in the pump box. The inert gas in the pump box is sealed by the inert gas in the sealing cover, and the shaft seal of the vertical mechanical pump 5 is sealed. The assembly 13 changes from a dynamic seal to a static seal between the flange 14 on the sealing cover 6 and the pump connecting flange 25, so as to realize the complete zero leakage of the vertical mechanical pump.

The upper end of the sealing cover 6 is the sealing cover end cap 9, the two are connected and sealed by threads and gaskets, and the sealing cover end cover 9 is provided with terminal 26, mainly the vertical mechanical pump 5 power supply and signal lead wire terminal, wiring The terminal 26 adopts a spark plug, and the sealing cover 6 is arranged with a circulating cooling water jacket 10 in the circumferential direction, which is used to cool the heat generated by the motor and bearings in the sealing cover, so as to ensure the safe and long-term stable operation of the vertical mechanical pump 5 .

Claims (3)

1. a liquid metal pool drive unit black box, is characterized in that: comprise liquid metal injected system (1), stop valve (2), pump box black box (3), exhaust-valve (7) and storage tank (8), pump box black box (3) comprises pump box (4), vertical mechanical pump (5), seal closure (6), seal closure end cap (9), circulating cooling water jacket (10), cooling water inlet (11), coolant outlet (12), seal closure adpting flange (14), pump box flange (18), liquid metal entrance (19), emptying pipe (20), flow-stopping plate (21), pump box inert gas entrance pipe (22), seal closure inert gas entrance pipe (23), tenminal block (26), vertical mechanical pump (5) comprises gland seal assembly (13), the pump housing (15), pump intake (16), pump discharge (17), pump adpting flange (25), pump box (4) has pump adpting flange (25) above, vertical mechanical pump (5) and seal closure (6) are arranged on pump adpting flange (25), vertical mechanical pump (5) is positioned at seal closure (6), by seal closure (6) motor more than the pump adpting flange (25) of vertical mechanical pump (5), gland seal assembly (13) seal parts is in seal closure, the gland seal assembly of vertical mechanical pump (5) (13) is changed into static seal between flange (14) on seal closure (6) and pump adpting flange (25) by motive sealing, realize the complete zero leakage of vertical mechanical pump, seal closure (6) upper end is seal closure end cap (9), both are connected with sealing gasket by screw thread and seal, seal closure end cap (9) is provided with tenminal block (26), for vertical mechanical pump (5) power supply and signal lighting outlet tenminal block, tenminal block (26) adopts spark plug, seal closure (6) circumferential directions has circulating cooling water jacket (10), be used for the heat that coolant seal cover internal cause motor and bearing produce, ensure that vertical mechanical pump (5) safety is steady in a long-term and run.

2. liquid metal pool drive unit black box as claimed in claim 1, it is characterized in that: in pump box black box (3), seal closure (6) is core structure, seal closure (6) upper end is by seal closure end cap (9) sealing, and seal closure circumferential directions has circulating cooling water jacket (10).

3. liquid metal pool drive unit black box as claimed in claim 1, it is characterized in that: in pump box black box (3), seal closure end cap (9) is furnished with signal leading out terminal (26), signal leading out terminal (26) is spark plug.