CN219472899U - Buffering pressure relief device for descaling pump - Google Patents

Abstract

The utility model belongs to the technical field of high-pressure water descaling systems in metallurgical industry, and discloses a buffering pressure relief device for a descaling pump, which aims to solve the problems of short service cycle, production interruption caused by water leakage and the like of a back pressure relief loop of a primary descaling system.

Description

Buffering pressure relief device for descaling pump

Technical Field

The utility model relates to the technical field of high-pressure water descaling systems in the metallurgical industry, in particular to a buffering and pressure releasing device for a descaling pump.

Background

The CSP continuous casting and rolling production line is an advanced production line in the field of modern hot rolled strip steel production, and has the characteristic of compact one-step forming and connection, wherein hot continuous rolling is an important process in the whole production line, and the CSP continuous casting and rolling production line integrates the process steps of heating, descaling, rolling, layer cooling, coiling and the like and a production unit. The high-pressure water descaling system is a serious problem in the production unit for ensuring the quality of products. The hot-rolled strip steel hot rolling mill has the functions that after DC2 cooling water is pressurized by adopting 9 high-pressure pumps, the hot-rolled strip steel hot rolling mill is sprayed onto the surface of hot-rolled strip steel discharged from a heating furnace by utilizing a header nozzle of a descaling machine, and oxidized iron scales on the surface of the hot-rolled strip steel hot rolling mill are totally removed and then enter a continuous rolling mill set for rolling. In the production process, once a primary descaling system fails, descaling pressure is insufficient, iron scales on the surface of the hot rolled strip steel cannot be completely removed, and finally quality defects of slag inclusion are generated in the rolled hot rolled strip steel, so that the quality and brand image of the hot rolled strip steel are seriously influenced. Sometimes, production can only be interrupted for the purpose of stopping damage.

The inlet header of the high-pressure water descaling system is subjected to pressure adjustment by a combination of 3 constant delivery pumps and 1 variable frequency pump, the outlet header is subjected to pressure adjustment by a combination of 4 constant delivery pumps and 1 variable frequency pump, and when the steel is normally treated, the system is in a low-pressure pre-flushing state by pressure relief of each pump through a high-pressure water relief valve A of a back pressure relief loop F1 in the figure 1, at the moment, the pressure of the inlet header is 23bar, and the pressure of the outlet header is 31bar. When the hot rolled strip steel passes through the descaling machine, the high-pressure water relief valve A of the back pressure relief loop F1 is closed to start descaling, and when the descaling is finished, the high-pressure water relief valve A of the back pressure relief loop F1 on each pump is instantaneously relieved to enable the system to recover a low-pressure pre-flushing state.

Because the pressure is very high during high-pressure water descaling, the inlet header 240bar, the outlet header 380bar and the descaling frequency are very high, and each working day is about 500 times, namely, the descaling pump needs to instantly relieve pressure about 500 times each day, the pressure relief loop pipeline behind the high-pressure water relief valve A of the back pressure relief loop F1 is provided with extremely frequent and extremely large impact force, and the main problem caused by the working condition is that the pipeline of the back pressure relief loop F1 leaks water and is mainly embodied in the joint D of the outlet of the high-pressure water relief valve A of each pump back pressure relief loop F1, the joint E part of the three-way pipe, the pipeline of the back pressure relief loop F1 and the plug H. The back pressure relief loop F1 is typically maintained for a service period of about 25 days after replacement of a new spare part, and sometimes serious water leakage may occur in less than 25 days. In the production process, the pipeline of the back pressure relief loop F1 in a certain pump of the primary descaling system leaks water, the descaling pressure is unstable, the scale on the surface of the hot rolled strip steel is not thoroughly cleaned to form the quality defect of slag inclusion, and especially when the production of the steel with compact production rhythm is carried out, the production can only be interrupted by breaking, the production of a large number of unqualified products is prevented, the production efficiency is seriously influenced, and the technical problems cannot be solved in the prior art.

Disclosure of Invention

The utility model aims to solve the problems of production interruption and the like caused by short service cycle and water leakage of a back pressure relief loop of a primary descaling system in the prior art, and provides a buffering pressure relief device for a descaling pump.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a descaling pump is with buffering pressure relief device, includes the relief valve, is connected with the tee bend coupling on the relief valve, and the one end of tee bend coupling is connected with low pressure return line, and the other end of tee bend coupling is connected with buffering pressure release return circuit, buffering pressure release return circuit includes first overcoat, and the one end and the tee bend pipe of first overcoat connect to be connected, and the other end of first overcoat is connected with the second overcoat, and first overcoat, second overcoat junction inner chamber are equipped with buffering case, and the radial of buffering case is equipped with the shutoff hole, and the axial of buffering case is equipped with the case runner, and the inner chamber of first overcoat, case runner and the inner chamber of second overcoat all communicate, and the end connection of second overcoat has the bypass line, and the bypass line is connected with low pressure return line.

Further, one end of the buffer valve core is provided with a valve core large end which is matched with a large end installation cavity arranged on the inner side of the first outer sleeve; one end of the buffer valve core is provided with a bushing, the bushing is matched with a small end installation cavity arranged on the inner side of the second outer sleeve, and a reset spring is arranged between the large end of the valve core and the end face of the second outer sleeve.

Further, one end of the second outer sleeve far away from the bushing is in threaded connection with a plug, and a plug channel is formed in the plug.

Further, the screwed plug is provided with a screwed plug interface, and the screwed plug interface is connected with the bypass pipeline.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model mainly aims at a buffering pressure relief loop designed for a return water pipeline of a descaling pump in a hot-rolling high-pressure water descaling system, and can prolong the maintenance period of the pressure relief loop of the descaling pump and improve the reliability of the pressure relief loop. The back pressure relief loop of the original pressure relief loop is designed and modified into a buffer pressure relief loop, the original maintenance period of 25 days is prolonged to 8-10 months, the equipment maintenance frequency is reduced, the pressure of the descaling system is always in a normal and stable state, and then the efficient production rhythm and the quality of high-quality products of the hot rolled strip steel are ensured.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is a schematic diagram of an assembly structure of a buffer decompression loop according to the present utility model.

Fig. 3 is a schematic structural view of the first jacket of the present utility model.

Fig. 4 is a schematic structural view of a second jacket according to the present utility model.

Fig. 5 is a schematic structural view of a damper core according to the present utility model.

FIG. 6 is a schematic view of the bushing of the present utility model.

Fig. 7 is a schematic structural view of the plug of the present utility model.

The reference numerals have the following meanings: 1. a first jacket; 2. a second jacket; 3. a buffer valve core; 4. a bushing; 5. plugging; 6. a return spring; 7. a cutoff hole; 8. a valve core flow passage; 9. plugging the channel; 10. a plug interface; 11. a large end mounting cavity; 12. a small end mounting cavity; 13. the large end of the valve core.

Detailed Description

The utility model is further described below with reference to the drawings and the detailed description.

As shown in fig. 1-7, a buffering pressure relief device for a descaling pump comprises a pressure relief valve a, wherein a three-way pipe joint E is connected to the pressure relief valve a through a joint D, one end of the three-way pipe joint E is connected with a low-pressure return pipe line B, the other end of the three-way pipe joint E is connected with a buffering pressure relief loop F, the buffering pressure relief loop F comprises a first outer sleeve 1, one end of the first outer sleeve 1 is connected with the three-way pipe joint E through threads, the other end of the first outer sleeve 1 is connected with a second outer sleeve 2 through threads, a buffering valve core 3 is arranged in an inner cavity at the joint of the first outer sleeve 1 and the second outer sleeve 2, a cutoff hole 7 is radially arranged on the buffering valve core 3, a valve core runner 8 is axially arranged on the buffering valve core 3, the inner cavity of the first outer sleeve 1, the valve core runner 8 and the inner cavity of the second outer sleeve C are all communicated, one end of the buffering valve core 3 is provided with a valve core big end 13, the valve core big end 13 is matched with a big end installation cavity 11 arranged on the inner side of the first outer sleeve 1, one end of the buffering valve core 3 is provided with a bushing 4, the bushing 4 is matched with a small end installation cavity 12 arranged on the inner side of the second outer sleeve 2, and a reset spring 6 is arranged between the big end 13 and the outer end 2 is provided with the valve core 6.

The end of the second outer sleeve 2 is far away from one end of the lining 4 and is in threaded connection with a plug 5, a plug channel 9 is formed in the plug 5, a plug connector 10 is further arranged at the end of the plug 5, the plug connector 10 is connected with a bypass pipeline C, and the bypass pipeline C is connected with a low-pressure water return pipeline B.

In the production application, after the high-pressure water is instantaneously decompressed by the high-pressure water decompression valve A, according to the flow direction of the water, the water enters the first outer sleeve 1 at the first time and then reaches the position of the buffer valve core 3 through the connector D and the three-way connector E, and under the action of the thrust of the discharged water, the buffer valve core 3 starts to move along the water flow direction under the guidance of the bushing 4.

The buffer valve core 3 is radially provided with a cutoff hole 7 with phi 4, and water outside the buffer valve core 3 flows into the inner side of the buffer valve core 3 under the action of the cutoff hole 7 with phi 4.

At the same time, the buffer valve core 3 moves towards the water flow direction until the limit position of the return spring 6 is approached, and the instant pressure relief process is completed in the first step.

Then, most of the discharged water discharged from the high-pressure water discharge valve A bounces from the top of the buffer valve core 3, returns to the outlet on the other side of the three-way joint E and flows back to the low-pressure water return pipeline B.

And part of water flows back to the low-pressure water return pipeline B through the phi 8 valve core flow channel 8 in the middle of the buffer valve core 3, the cavity of the second outer sleeve 2, the plug channel 9 of phi 6 and the bypass pipeline C of DN6, and the pressure release process is completed in the second step.

Then, the buffer valve core 3 is reset gradually under the action of the reset spring 6 until the next descaling starts to reset completely, and the whole buffer pressure relief process is finished.

The top of the buffering pressure relief loop is provided with a high-pressure water relief valve, and when steel is normally kept, high-pressure water is relieved through the pressure relief valve at the outlet of each pump, so that the system is in a low-pressure pre-flushing state, at the moment, the pressure of an inlet header is 23bar, and the pressure of an outlet header is 31bar.

It should be noted that, the bypass line C added between the bottom of the buffer pressure relief loop F and the low pressure water return line B is low in and high out, i.e. the inside of the buffer pressure relief loop F is always full of water.

Claims (4)

1. The utility model provides a descaling pump is with buffering pressure relief device, includes relief valve (A), is connected with three-way pipe joint (E) on relief valve (A), and three-way pipe joint (E)'s one end is connected with low pressure return line (B), and three-way pipe joint (E's) other end is connected with buffering pressure relief return circuit (F), characterized by: the buffering pressure release return circuit (F) is connected with tee bend pipe joint (E) including first overcoat (1), the other end of first overcoat (1) is connected with second overcoat (2), first overcoat (1), buffering case (3) are equipped with to second overcoat (2) junction inner chamber, the radial orifice (7) that are equipped with of buffering case (3), the axial of buffering case (3) is equipped with case runner (8), and the inner chamber of first overcoat (1), case runner (8) and the inner chamber of second overcoat (2) all communicate, the end connection of second overcoat (2) has bypass line (C), bypass line (C) are connected with low pressure return line (B).

2. The buffer pressure relief device for a descaling pump according to claim 1, wherein: one end of the buffer valve core (3) is provided with a valve core big end (13), and the valve core big end (13) is matched with a big end installation cavity (11) arranged on the inner side of the first outer sleeve (1); one end of the buffer valve core (3) is provided with a bushing (4), the bushing (4) is matched with a small end installation cavity (12) arranged on the inner side of the second outer sleeve (2), and a reset spring (6) is arranged between the large end (13) of the valve core and the end face of the second outer sleeve (2).

3. The buffer pressure relief device for a descaling pump according to claim 2, wherein: one end of the second outer sleeve (2) far away from the bushing (4) is in threaded connection with a plug (5), and a plug channel (9) is formed in the plug (5).

4. A buffer pressure relief device for a descaling pump according to claim 3, wherein: the plug (5) is provided with a plug interface (10), and the plug interface (10) is connected with the bypass pipeline (C).