Hot rolled steel strip cooling system based on vortex tube effect

Abstract

The utility model discloses a hot rolled steel strip cooling system based on a vortex tube effect, which comprises an air compressor, a vortex tube, a water inlet pipe, a cold air pipe, a hot air pipe, a spray pipe and a compressed air pipe, and a cold air outlet is connected with the spray pipe through the cold air pipe. The hot air outlet is connected to an inlet of the air compressor through a hot air pipe, an outlet of the air compressor is communicated with the compressed air inlet through a compressed air pipe, and the water inlet pipe is connected into the cold air pipe. According to the hot rolled steel strip cooling system based on the vortex tube effect, the vortex tube is arranged in the cooling system, normal-temperature air entering the vortex tube can be cooled and then injected into the water inlet pipe, water flow in the water inlet pipe is rapidly cooled, so that the temperature of the water flow in the spraying pipe is reduced, and the low-temperature water flow is sprayed on a steel strip; the purpose of rapidly reducing the temperature of the steel belt is achieved, the water supply amount is reduced, the return water treatment amount is also reduced, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of steel production, in particular to a hot-rolled steel strip cooling system based on vortex tube effect. Background Art

[0002] The hot-rolled steel strip needs to be cooled evenly and quickly, and the temperature of the steel strip needs to be reduced to the phase transformation point within a controllable time, retaining the refinement effect of dynamic recrystallization and sub-dynamic recrystallization on the austenite structure during high-temperature rolling.

[0003] In the prior art, high-pressure water with a large flow rate is used to rapidly cool the upper and lower surfaces of the rolled steel strip. The existing cooling water system operates at room temperature, and the output room-temperature cooling water cannot be cooled quickly. The cooling time is long, resulting in a large water supply system and a large amount of return water treatment, high cost of use, and low efficiency.

[0004] In view of this, it is necessary to propose a hot-rolled steel strip cooling system based on the vortex tube effect to solve the above-mentioned defects. Utility Model Content

[0005] The main purpose of the utility model is to provide a hot-rolled steel strip cooling system based on the vortex tube effect, aiming to solve the problem that the high temperature of the existing room temperature water leads to slow cooling speed and long cooling time, which in turn leads to large processing volume of the water supply system and the return water system.

[0006] To achieve the above-mentioned purpose, the utility model provides a hot-rolled steel strip cooling system based on the vortex tube effect, comprising an air compressor, a vortex tube, a water inlet pipe, a cold air pipe, a hot air pipe, a spray pipe and a compressed air pipe, the vortex tube having a hot air outlet, a cold air outlet and a compressed air inlet, the cold air outlet being connected to the spray pipe through the cold air pipe, the hot air outlet being connected to the inlet of the air compressor through the hot air pipe, the outlet of the air compressor being connected to the compressed air inlet through the compressed air pipe, and the water inlet pipe being connected to the cold air pipe.

[0007] Preferably, the vortex tube comprises a tube body having an internal channel, a diverter and an outlet valve, the two ends of the tube body are respectively a cold air end and a hot air end, the diverter is installed at the cold air end of the tube body and is connected to the compressed air inlet to divert the air entering the tube body from the compressed air inlet, the outlet valve is axially installed at the hot air end and can move axially along the tube body, and the hot air outlet is formed at the hot air end.

[0008] Preferably, a guide groove is provided on the diverter, and the guide groove connects the compressed air inlet and the internal channel.

[0009] Preferably, the guide groove is spiral and there are multiple guide grooves, which are distributed in a circle with the center line of the diverter as the center.

[0010] Preferably, a control valve is provided in the pipeline connecting the air compressor and the compressed air pipe.

[0011] Preferably, the flow divider and the outlet valve are connected to the pipe body via threads.

[0012] Preferably, one end of the outlet valve is conical, a guide surface having the same inclination angle as the conical surface of the outlet valve is formed inside the hot gas end, and the outlet valve controls the gap between the conical surface and the guide surface by axial movement.

[0013] Preferably, the spray pipe comprises a main pipe connected to the cold air pipe and a plurality of branch pipes connected to the main pipe, and each of the branch pipes is distributed on the upper and lower surfaces of the steel strip.

[0014] Preferably, it also includes a compressed air supply pipe for starting the system, and the compressed air supply pipe is connected to the vortex chamber of the vortex tube through the compressed air pipe.

[0015] Compared with the prior art, the hot-rolled steel strip cooling system based on the vortex tube effect provided by the utility model has the following beneficial effects:

[0016] The hot-rolled steel strip cooling system based on the vortex tube effect provided by the utility model arranges the vortex tube in the cooling system. Based on the vortex tube effect, the room-temperature air entering the vortex tube can be cooled and then injected into the water inlet pipe to achieve extremely rapid cooling of the water flow in the water inlet pipe, thereby reducing the temperature of the water flow in the spray pipe, and spraying the low-temperature water on the steel strip to achieve the purpose of quickly reducing the temperature of the steel strip, thereby improving work efficiency and reducing the water supply, thereby reducing the demand for the supply system. In this way, the return water treatment volume is also reduced, thereby reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a hot-rolled steel strip cooling system based on the vortex tube effect provided by the utility model;

[0019] Figure 2 for Figure 1 The structural schematic diagram of the vortex tube shown;

[0020] Figure 3 for Figure 2 A cross-sectional view of a vortex tube is shown;

[0021] Figure 4 for Figure 3 The structural schematic diagram of the diverter shown;

[0022] Figure 5 for Figure 3 Schematic diagram of the structure of the outlet valve shown.

[0023] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0028] Please refer to Figure 1-Figure 3The utility model provides a hot-rolled steel strip cooling system based on the vortex tube effect. The hot-rolled steel strip cooling system based on the vortex tube effect is used to quickly cool the hot-rolled steel strip 100. The hot-rolled steel strip cooling system based on the vortex tube effect comprises an air compressor 1, a vortex tube 2, a water inlet pipe 3, a cold air pipe 4, a hot air pipe 5, a spray pipe 6 and a compressed air pipe 8. The vortex tube 2 has a hot air outlet 21, a cold air outlet 23 and a compressed air inlet 24. The cold air outlet 23 is connected to the spray pipe 6 through the cold air pipe 4, the hot air outlet 21 is connected to the inlet of the air compressor 1 through the hot air pipe 5, the outlet of the air compressor 1 is connected to the compressed air inlet 24 through the compressed air pipe 8, and the water inlet pipe 3 is connected to the cold air pipe 4. The compressed air of the air compressor 1 enters the vortex tube 2 through the compressed air pipe 8, and the cold air discharged from the vortex tube 2 is discharged into the spray pipe 6 through the cold air pipe 4 to reduce the temperature of the normal temperature water flow in the spray pipe 6, and the hot air discharged from the vortex tube 2 is discharged into the air compressor 1 through the hot air pipe 5. The vortex tube 2 based on the vortex tube effect is arranged in the cooling system, and can cool the normal temperature air entering therein and inject it into the water inlet pipe 3 to achieve the extremely fast cooling of the water flow in the water inlet pipe 3, so that the water flow temperature in the spray pipe 6 is low, and the low-temperature water flow is sprayed on the steel belt, so as to achieve the purpose of quickly reducing the temperature of the steel belt, improve the work efficiency, and at the same time, reduce the water supply, thereby reducing the demand for the supply system, so that the return water treatment volume is also reduced, thereby reducing the cost.

[0029] like Figure 2 and Figure 3As shown, the vortex tube 2 includes a tube body 25 with an internal channel, a diverter 26 and an outlet valve 27. The two ends of the tube body 25 are respectively a cold air end 251 and a hot air end 253. The diverter 26 is installed at the cold air end 251 of the tube body 25 and is connected to the compressed air inlet 24 to divert the air entering the tube body 25 from the compressed air inlet 24. The outlet valve 27 is axially installed at the hot air end 253 and can move axially along the tube body 25. The hot air outlet 21 is formed at the hot air end 253. The vortex tube 2 is a tool driven by compressed air. After the compressed air is injected into the vortex chamber of the vortex tube 2, the airflow rotates at a speed of up to one million revolutions per minute and flows to the hot air outlet 21 of the vortex tube 2. A part of the airflow flows out through the outlet valve 27, and the remaining gas is blocked and rotates in the opposite direction at the same speed in the inner circle of the original airflow, and flows to the cold air outlet 23 of the vortex tube 2. In this process, the two airflows exchange heat, the inner ring airflow becomes very cold, and flows out from the cold air outlet 23 of the vortex tube 2, and the outer ring airflow becomes very hot and flows out from the hot air outlet 21 of the vortex tube 2. The cold air flowing out of the cold air outlet 23 is injected into the water inlet pipe 3 to reduce the water temperature in the water inlet pipe 3. In this way, when the water temperature sprayed from the tube plate spray pipe 6 is lower, the cooling speed of the steel belt is faster, so as to achieve the purpose of quickly reducing the temperature of the steel belt to speed up the work efficiency, and the supply requirements for the supply system are also reduced, while also reducing the waste of water resources.

[0030] It should be noted that the low-temperature air coming out of the cold air outlet 23 of the vortex tube 2 is at -20 to -40°C, and the hot air flowing out of the hot air outlet 21 is around 100°C. Therefore, the vortex tube 2 is connected to the water inlet pipe 3, and the low-temperature air formed therein can quickly reduce the temperature of the water flow in the water inlet pipe 3.

[0031] like Figure 4 As shown, the diverter 26 is provided with a guide groove 261, and the guide groove 261 connects the compressed air inlet 24 and the internal channel. The guide groove 261 is spiral, and the spiral guide groove 261 guides the compressed air into the tube body 25. When the compressed air enters the guide groove 261, it moves in a spiral line, thereby increasing the movement speed of the airflow entering the tube body 25.

[0032] There are multiple guide grooves 261, and the multiple guide grooves 261 are distributed in a circle with the center line of the diverter 26 as the center. It can be understood that the multiple guide grooves 261 can increase the air intake speed and increase the flow rate.

[0033] The flow divider 26 and the outlet valve 27 are connected to the pipe body 25 by threads. The outer peripheries of the flow divider 26 and the outlet valve 27 are threaded, and the flow divider 26 and the outlet valve 27 are screwed into the pipe body 25 during installation. The threaded connection has high strength and stable structure.

[0034] like Figure 5 As shown, one end of the outlet valve 27 is a conical surface, and a plurality of air outlet slots are provided along the axial direction of the outer periphery, and the hot air flows out from the air outlet slots. A guide surface having the same inclination angle as the conical surface of the outlet valve 27 is formed inside the hot air end 253, and the outlet valve 27 controls the gap between the conical surface and the guide surface by axial movement. The smaller the gap, the smaller the flow rate of the hot air outlet 21, and the larger the gap, the larger the flow rate of the hot air outlet 21. Therefore, the outlet valve 27 is used to control the flow rate of hot air, while the temperature and flow rate of the cold air flow at the cold air end 251 are controlled by the outlet valve 27. The higher the air outlet ratio of the hot air end 253 of the vortex tube 2, the lower the temperature of the air flow at the cold air end 251 of the vortex tube 2, and the flow rate is reduced accordingly.

[0035] The spray pipe 6 includes a main pipe 61 connected to the cold air pipe 4 and a plurality of branch pipes 63 connected to the main pipe 61, each of which is distributed on the upper and lower surfaces of the steel strip. Each of the branch pipes 63 is equipped with a plurality of nozzles, which spray toward the steel strip 100 to reduce the temperature of the steel strip.

[0036] The hot-rolled steel strip cooling system further includes a compressed air supply pipe 7 for system startup, the compressed air supply pipe 7 is connected to the standby air compressor, and the compressed air supply pipe 7 is connected to the vortex tube 2 through the compressed air pipe 8. It can be understood that, since the temperature difference of the vortex tube 2 has not been achieved in the initial state, the air compressor 1 has no heat source and cannot work normally. At this time, by starting the standby air compressor, compressed air is delivered to the vortex tube 2 through the compressed air supply pipe 7. When the hot air outlet 21 delivers hot air to the air compressor 1, the air compressor 1 starts to work.

[0037] Preferably, the air compressor 1 is a Stirling compressor. A control valve 9 is provided in the pipeline connecting the air compressor 1 and the compressed air pipe 8. After the air is supplied by the standby air compressor, hot air is generated under the action of the vortex tube, and the hot air is transported to the Stirling air compressor, which converts the heat energy into mechanical energy to do work and output compressed air. When the compressed air pressure reaches the set value, the control valve is automatically opened, and the air compressor transports the compressed air to the vortex tube 2 through the compressed air pipe 8, so as to achieve the purpose of recycling heat energy.

[0038] The hot-rolled steel strip cooling system based on the vortex tube effect provided by the utility model arranges the vortex tube 2 in the cooling system. Based on the vortex tube effect, the room-temperature air entering the vortex tube can be cooled and then injected into the water inlet pipe 3 to achieve extremely rapid cooling of the water flow in the water inlet pipe 3, thereby reducing the temperature of the water flow in the spray pipe 6, and the low-temperature water flow is sprayed on the steel strip, so as to achieve the purpose of quickly reducing the temperature of the steel strip, thereby improving work efficiency and reducing the water supply at the same time, thereby reducing the demand for the supply system. In this way, the return water treatment volume is also reduced, thereby reducing the cost.

[0039] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A hot-rolled steel strip cooling system based on vortex tube effect, characterized in that: It includes an air compressor, a vortex tube, a water inlet pipe, a cold air pipe, a hot air pipe, a spray pipe and a compressed air pipe. The vortex tube has a hot air outlet, a cold air outlet and a compressed air inlet. The cold air outlet is connected to the spray pipe through the cold air pipe, the hot air outlet is connected to the inlet of the air compressor through the hot air pipe, the outlet of the air compressor is connected to the compressed air inlet through the compressed air pipe, and the water inlet pipe is connected to the cold air pipe.

2. The hot-rolled steel strip cooling system based on the vortex tube effect according to claim 1 is characterized in that: The vortex tube includes a tube body with an internal passage, a diverter and an outlet valve, the two ends of the tube body are respectively a cold air end and a hot air end, the diverter is installed at the cold air end of the tube body and is connected to the compressed air inlet to divert the air entering the tube body from the compressed air inlet, the outlet valve is axially installed at the hot air end and can move axially along the tube body, and the hot air outlet is formed at the hot air end.

3. The hot-rolled steel strip cooling system based on the vortex tube effect according to claim 2 is characterized in that: The diverter is provided with a guide groove, and the guide groove is connected with the compressed air inlet and the internal channel.

4. The hot-rolled steel strip cooling system based on the vortex tube effect according to claim 3 is characterized in that: The guide grooves are spiral and there are multiple of them, and the multiple guide grooves are distributed in a circle with the center line of the diverter as the center.

5. The hot-rolled steel strip cooling system based on vortex tube effect according to claim 3, characterized in that: A control valve is arranged in the pipeline connecting the air compressor and the compressed air pipe.

6. The hot-rolled steel strip cooling system based on vortex tube effect according to claim 2, characterized in that: The flow divider and the outlet valve are all connected to the pipe body through threads.

7. The hot-rolled steel strip cooling system based on vortex tube effect according to claim 2, characterized in that: One end of the outlet valve is in the form of a cone, and a guide surface having the same inclination angle as the cone surface of the outlet valve is formed inside the hot gas end. The outlet valve controls the gap between the cone surface and the guide surface by axial movement.

8. The hot-rolled steel strip cooling system based on vortex tube effect according to claim 1, characterized in that: The spray pipe comprises a main pipe connected to the cold air pipe and a plurality of branch pipes connected to the main pipe, and each of the branch pipes is distributed on the upper and lower surfaces of the steel strip.

9. The hot-rolled steel strip cooling system based on vortex tube effect according to claim 1, characterized in that: It also includes a compressed air supply pipe for starting the system, and the compressed air supply pipe is connected to the vortex chamber of the vortex tube through the compressed air pipe.

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