Internal mixing type slit high-speed spray cooling device and application

Abstract

The invention discloses an internal mixing type slit high-speed spray cooling device and application, and relates to the technical field of heat treatment equipment. An internal mixing type slit high-speed spray cooling device comprises a spray pipe, at least one end of the spray pipe is provided with a breather pipe, the breather pipe is connected with an air pump, the breather pipe is provided with a water pipe, the water pipe is connected with a water pump, the water pipe is provided with a check valve, and the air pump and the water pump are both electrically connected with a controller; a spraying flow channel with the two ends large in aperture and the middle small in aperture is arranged in the spraying pipe, and a plurality of slit type nozzles are arranged on the side wall of the spraying pipe and communicated with the spraying flow channel. By the adoption of the internal mixing type slit high-speed spray cooling device and the application, the problem that an existing spray cooling device is poor in quenching quality of slender cavity structure parts can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment equipment, and in particular to an internal mixing type narrow slit high-speed spray cooling device and application thereof. Background Art

[0002] Heat treatment is a process that changes the properties of materials through heating and cooling. For example, metal materials such as steel can be improved in hardness, toughness, strength and other properties through heat treatment. Common heat treatment methods include annealing, quenching, tempering, normalizing, etc. In the heat treatment process, especially in processes such as quenching, the cooling rate and method directly affect the microstructure and performance of the parts.

[0003] At present, oil quenching is often used in the heat treatment cooling process, that is, the heated workpiece is immersed in quenching oil for rapid cooling, but it faces problems such as harsh working environment, excessive residual stress, uneven distribution, and difficulty in regulating microstructure performance. Existing patents CN202410201009, CN117448526A, and CN117448538A disclose highly integrated high-speed spray cooling methods and devices, using high-speed water mist jets as jet impact cooling media to control large metal components, especially complex cross-section aviation components. Rapid cooling is achieved to achieve efficient and clean heat treatment. However, in the face of slender deep cavity structures with poor openness, affected by the cavity cross-section, the existing spray cooling device cannot enter the interior of the slender cavity, and the high-speed cooling spray is difficult to reach the inner surface of the cavity, resulting in deterioration of heat transfer and difficulty in achieving uniform and rapid cooling of the inner wall surface. Therefore, it is necessary to develop a spray cooling device that can achieve uniform cooling of the inner wall of the slender cavity. Summary of the invention

[0004] The purpose of the present invention is to provide an internal mixing type narrow slot high-speed spray cooling device and application thereof, so as to solve the problem that the existing spray cooling device has poor quenching quality for slender cavity structure parts.

[0005] To achieve the above-mentioned purpose, the present invention provides an internal mixing slit high-speed spray cooling device, comprising a spray pipe, at least one end of the spray pipe is provided with a ventilation pipe, the ventilation pipe is connected to an air pump, a water pipe is provided on the ventilation pipe, the water pipe is connected to a water pump, a check valve is provided on the water pipe, and the air pump and the water pump are both electrically connected to a controller; a spray flow channel with large apertures at both ends and a small aperture in the middle is provided inside the spray pipe, a plurality of slit nozzles are provided on the side wall of the spray pipe, and the slit nozzles are connected to the spray flow channel.

[0006] Preferably, the slit nozzles are evenly distributed on the side wall of the spray pipe, the outer ends of the slit nozzles are located on the same circumference, and the sum of the areas of the longitudinal sections of the spray pipe is smaller than the sum of the areas at the inlets of the ventilation pipe.

[0007] Preferably, the length of the slit nozzle is 200 mm-600 mm, the inner diameter of the end of the spray pipe is 30 mm-40 mm, and the curvature radius of the spray pipe is 500 mm-5000 mm.

[0008] Preferably, the length of the spray flow channel is 200 mm-600 mm, the radius of curvature of the spray flow channel is 500 mm-5000 mm, and the width of the spray flow channel is 1 mm-5 mm.

[0009] Preferably, a guide plate is provided at the mist outlet end of the slit nozzle, the guide plate is fixed on the spray pipe, and guide holes for spraying water mist are provided on the guide plate.

[0010] Preferably, the mist inlet end of the guide hole is a conical structure with a large end opening width and a small middle opening, and the mist outlet end of the guide hole is a bell-mouth structure with an angle of 90°-150°, and the narrowest width of the guide hole is 0.2mm-5mm.

[0011] Preferably, a gas temperature sensor and a gas pressure sensor are provided on the ventilation pipe, the ventilation pipe is sleeved on the outside of the spray pipe, the ventilation pipe is threadedly connected to the spray pipe, and the gas temperature sensor and the gas pressure sensor are both electrically connected to the controller.

[0012] Preferably, the ventilation pipe is provided with a water nozzle, which is connected to the water pipe through a check valve. The water pipe is provided with mounting holes for mounting a water temperature sensor and a water pressure sensor. The water temperature sensor and the water pressure sensor are both electrically connected to the controller.

[0013] Preferably, the check valve includes a valve body, one end of the valve body is connected to the water nozzle, the other end of the valve body is provided with a flange plate, the flange plate is provided with a connecting hole, the valve body is connected to the water pipe through the connecting hole, a sealing gasket is provided between the flange plate and the water pipe, a valve disc is provided inside the water inlet end of the valve body, a valve stem arranged along the axial direction of the valve body is provided on the valve disc, a mounting seat is fixedly provided inside the valve body, a through hole for the valve stem to pass through is provided on the mounting seat, the valve stem is slidably connected to the mounting seat, a spring is provided between the valve disc and the mounting seat, the valve disc contacts the inner wall of the valve body under the action of the spring, a valve cover is provided at the water outlet end of the valve body, a water through hole is provided in the center of the valve cover, the area of ​​the water through hole is smaller than the water inlet area of ​​the valve body, and the inner diameter of the water through hole is smaller than the inner diameter of the water nozzle.

[0014] The above-mentioned internal mixing narrow slit high-speed spray cooling device is used in the quenching of parts with slender cavity structures, and the spray speed of the nozzle is 30m / s-200m / s.

[0015] The internal mixing type narrow slit high-speed spray cooling device and its application advantages and positive effects described in the present invention are: 1. The present invention is provided with a spray pipe, and slit nozzles are evenly arranged on the side wall of the spray pipe. The inner cavity of the workpiece is cooled by the slit nozzles, which can meet the quenching needs of the workpiece with a slender inner cavity.

[0016] 2. The internal spray channel of the spray tube of the present invention is a dumbbell-shaped structure with a large aperture at the end and a small aperture in the middle, so that the gas and cooling water are accelerated and mixed evenly in the spray channel, thereby improving the spray speed and uniformity.

[0017] 3. The present invention provides ventilation pipes at both ends of the spray pipe, and a water pipe is provided on the ventilation pipe, the water pipe is vertically arranged to the ventilation pipe, the gas and cooling water are mixed in the ventilation pipe near the end of the spray pipe, and are counter-acted in the spray pipe, thereby improving the atomization effect.

[0018] 4. The present invention arranges a guide plate on the slit nozzle, and the guide holes in the guide plate further accelerate the spray and diffuse the spray, so that the spray is evenly sprayed in the inner cavity of the workpiece, thereby improving the uniformity and cooling rate of the workpiece.

[0019] 5. The spray tube of the present invention is provided with multiple lengths, which can meet the quenching needs of workpieces with slender cavities of different lengths. The spray tube is made of high temperature resistant material, which meets the quenching needs of workpieces in high temperature environments.

[0020] 6. The spray cooling device of the present invention has a simple structure and is easy to use. The various connecting parts are connected by threads, which makes installation and disassembly easy.

[0021] 7. The present invention adjusts the temperature and pressure of water and gas according to the needs through the data fed back by the temperature sensor and the pressure sensor, thereby realizing the intelligent control of the spray cooling device. There is no oil smoke and waste liquid discharge during the operation process, which is conducive to improving the quenching process environment and realizing clean heat treatment.

[0022] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the spray cooling device according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of a spray cooling device according to an embodiment of the present invention; Figure 3 It is a schematic diagram of the top view of the structure of the spray cooling device according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of a spray pipe according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the longitudinal cross-section structure of a spray pipe according to an embodiment of the present invention; Figure 6A schematic diagram of the cross-sectional structure of a spray pipe according to an embodiment of the present invention; Figure 7 A schematic diagram of the three-dimensional structure of a ventilation pipe according to an embodiment of the present invention; Figure 8 A schematic diagram of the three-dimensional structure of a water pipe according to an embodiment of the present invention; Fig. 9 A schematic diagram of the three-dimensional structure of a check valve according to an embodiment of the present invention; Fig.10 A schematic diagram of a cross-sectional structure of a check valve according to an embodiment of the present invention; Fig.11 A schematic diagram of the internal structure of a check valve according to an embodiment of the present invention; Fig.12 This is a schematic diagram of the use status of the spray cooling device according to an embodiment of the present invention.

[0024] Reference numerals 1. Spray pipe; 2. Ventilation pipe; 3. Water pipe; 4. Check valve; 5. Slit nozzle; 6. Guide plate; 7. Spray channel; 8. Water nozzle; 9. Guide hole; 10. Mounting hole; 11. Valve body; 12. Valve cover; 13. Water hole; 14. Flange plate; 15. Connection hole; 16. Valve disc; 17. Valve stem; 18. Mounting seat; 19. Spring. DETAILED DESCRIPTION

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] Example 1 like Figure 1 , Figure 2 , Figure 3As shown. An internal mixing slit high-speed spray cooling device includes a spray pipe 1, which is made of high-temperature resistant material to adapt to high-temperature working environment and ensure the stability and durability of the device. A ventilation pipe 2 is provided at at least one end of the spray pipe 1. In this embodiment, ventilation pipes 2 are provided at both ends of the spray pipe 1. Ventilation is carried out from both ends of the spray pipe 1, and the gas drives the liquid to collide and collide in the spray channel 7, thereby improving the liquid atomization effect. The ventilation pipe 2 is connected to the air pump for introducing gas into the ventilation pipe 2. The ventilation pipe 2 is sleeved on the outside of the spray pipe 1, and the bottom end of the ventilation pipe 2 is threadedly connected to the spray pipe 1. A gas temperature sensor and a gas pressure sensor are provided on the ventilation pipe 2, and the gas temperature sensor and the gas pressure sensor are electrically connected to the controller. The gas temperature sensor and the gas pressure sensor respectively monitor the temperature and pressure of the gas entering the ventilation pipe 2, and feed back the monitoring results to the controller in real time, so as to facilitate the adjustment of the temperature and pressure of the gas as needed.

[0028] In this embodiment, the vent pipe 2 has an outer diameter of 44 mm, an inner diameter of 40 mm, a wall thickness of 2 mm, and a length of 120 mm. The gas temperature sensor and the gas pressure sensor are arranged on the inner wall of the vent hole 30 mm away from the air inlet end of the vent hole.

[0029] like Figure 7 , Figure 8 As shown. A water nozzle 8 is provided on the ventilation pipe 2, and the water nozzle 8 is connected to the water pipe 3 through a check valve 4. Two water nozzles 8 are symmetrically arranged on the side wall of the ventilation pipe 2. The water nozzle 8 is 60 mm away from the air inlet end of the ventilation pipe 2, and the water nozzle 8 has an outer diameter of 24 mm, an inner diameter of 20 mm, and a wall thickness of 2 mm. The water pipe 3 is connected to a water pump, which is used to deliver cooling water into the water pipe 3. The water pipe 3 is provided with mounting holes 10 for installing a water temperature sensor and a water pressure sensor, and the water temperature sensor and the water pressure sensor are installed inside the water pipe 3. The water temperature sensor and the water pressure sensor are both electrically connected to the controller. The water temperature sensor and the water pressure sensor are used to monitor the temperature and pressure of the water, respectively, and feed back the monitoring results to the controller in real time, so as to facilitate the adjustment of the water temperature and pressure as needed.

[0030] The air pump and water pump are both electrically connected to the controller. According to the monitoring results of the gas temperature pressure sensor and the water pressure sensor, the controller adjusts the power of the air pump and the water pump as needed to control the pressure of the gas and cooling water.

[0031] like Figure 4 , Figure 5 , Figure 6As shown. Both ends of the spray pipe 1 are provided with cylindrical connecting pipes for connecting with the ventilation pipe 2. The middle part of the spray pipe 1 is a dumbbell-shaped structure with large diameters at both ends and a small diameter in the middle. A conformal spray flow channel 7 is provided inside the spray pipe 1. After the gas and cooling water enter the spray flow channel 7 through the water pipe 3 and the ventilation pipe 2 respectively, the cross-sectional area of ​​the spray flow channel 7 is gradually reduced, and the gas and cooling water are compressed, which increases the speed of the gas and cooling water, and the gas and cooling water are fully mixed, which improves the flow characteristics of the fluid, reduces the flow resistance, improves the mixing efficiency, and improves the uniformity of the spray.

[0032] In this embodiment, the connecting pipe has an outer diameter of 40 mm, an inner diameter of 36 mm, a wall thickness of 2 mm, and a length of 50 mm. The spray pipe 1 has a length of 200 mm and a radius of curvature of 500 mm.

[0033] The inner diameter of the spray channel 7 at the upper and lower ends is 36 mm, the wall thickness is 2 mm, the length is 200 mm, and the curvature radius is 500 mm.

[0034] A plurality of slit nozzles 5 are arranged on the side wall of the spray pipe 1, and the slit nozzles 5 are connected to the spray channel 7. The slit nozzles 5 are evenly distributed on the side wall of the spray pipe 1, the outer ends of the slit nozzles 5 are located on the same circumference, and the inner ends of the slit nozzles 5 are arranged on the outer wall of the spray pipe 1 in a conformal manner. The slit nozzles 5 and the spray pipe 1 are arranged as an integrally formed structure. The sum of the areas of the longitudinal sections of the spray pipe 1 is smaller than the sum of the areas at the inlet of the vent pipe 2, so that the water mist is further accelerated when sprayed from the slit nozzles 5, thereby increasing the spray speed.

[0035] The outer diameter of the upper and lower sides of the slit nozzle 5 is 40 mm, the inner diameter is 36 mm, the thickness is 2 mm, the length is 200 mm, the radius of curvature is 500 mm, and the width is 4 mm.

[0036] The mist outlet end of the slit nozzle 5 is provided with a guide plate 6, which is fixed to the spray pipe 1 through a slot or is an integrally formed structure with the spray pipe 1 and the slit nozzle 5. The guide plate 6 is provided with a guide hole 9 for spraying water mist. The guide plate 6 is a cylindrical structure, and the outer diameter of the guide plate 6 is 6 mm.

[0037] The mist inlet end of the guide hole 9 is a tapered structure with a large opening width at the end and a small opening in the middle, so that the water mist entering the guide hole 9 through the slit nozzle 5 is further accelerated, thereby increasing the spraying speed of the water mist. The mist outlet end of the guide hole 9 is a bell-mouth structure with an angle of 120°. The bell-mouth structure diffuses the sprayed water mist so that the water mist is evenly sprayed on the workpiece, thereby improving the uniformity of cooling the workpiece. The narrowest width of the guide hole 9 is 2 mm.

[0038] like Fig. 9 , Fig.10 , Fig.11 As shown. A check valve 4 is arranged on the water pipe 3. The check valve 4 includes a valve body 11, one end of which is fixedly connected to the water nozzle 8 by bolts or welding seals. The valve body 11 is made of stainless steel and can withstand water pressure. A flange plate 14 is fixedly arranged on the other end of the valve body 11, and a plurality of connecting holes 15 are evenly arranged on the flange plate 14. The valve body 11 is fixedly connected to the water pipe 3 through the connecting holes 15 and bolts. A sealing gasket is arranged between the flange plate 14 and the water pipe 3 to improve the sealing effect between the check valve 4 and the water pipe 3. A valve flap 16 is arranged inside the water inlet end of the valve body 11, and a valve stem 17 arranged along the axial direction of the valve body 11 is fixedly arranged at the center of the valve flap 16. A mounting seat 18 is fixedly arranged inside the valve body 11, and a through hole is arranged on the mounting seat 18 for the valve stem 17 to pass through, and the valve stem 17 is slidably connected to the mounting seat 18. A spring 19 is provided between the valve flap 16 and the mounting seat 18 . The valve flap 16 contacts the inner wall of the valve body 11 under the action of the spring 19 , thereby closing the valve body 11 and blocking the water flow.

[0039] A valve cover 12 is fixedly provided at the water outlet of the valve body 11, and a water hole 13 is provided at the center of the valve cover 12. The water hole 13 is located on the axis of the valve body 11. The diameter of the water hole 13 is 6 mm. The area of ​​the water hole 13 is smaller than the water inlet area of ​​the valve body 11, so that the cooling water is further accelerated when passing through the water hole 13. The inner diameter of the water hole 13 is smaller than the inner diameter of the water nozzle 8, so that the cooling water enters the ventilation pipe 2 in a dispersed manner and is mixed with the gas in the ventilation pipe 2 more evenly.

[0040] The thickness of the flange is 2 mm, the number of mounting holes 10 is 8, and the diameter of the mounting holes 10 is 3 mm. In this embodiment, the check valve 4 can resist a water pressure of 5 kPa. When the water pressure exceeds 5 kPa, the valve flap 16 squeezes the spring 19, and the check valve 4 opens. When the water pressure reaches 10 kPa, the valve flap 16 contacts the mounting seat 18, and the check valve 4 opens to the maximum.

[0041] Example 2 The difference between this embodiment and embodiment 1 is that the spray pipe 1 has a length of 400 mm and a curvature radius of 2000 mm. The spray channel 7 has a length of 400 mm and a curvature radius of 2000 mm. The slit nozzle 5 has a length of 400 mm, a curvature radius of 2000 mm and a width of 2 mm.

[0042] The outer diameter of the guide plate 6 is 3 mm, and the width of the guide hole 9 at its narrowest point is 1 mm.

[0043] Example 3 The difference between this embodiment and embodiment 1 is that the length of the spray pipe 1 is 600 mm, and the radius of curvature is 5000 mm. The length of the spray channel 7 is 600 mm, and the radius of curvature is 5000 mm. The length of the slit nozzle 5 is 600 mm, and the radius of curvature is 5000 mm, and the width is 1.33 mm.

[0044] The outer diameter of the guide plate 6 is 2 mm, and the width of the guide hole 9 at its narrowest point is 0.66 mm.

[0045] Application example of internal mixing narrow slit high-speed spray cooling device The cavity of the workpiece has a diameter of 80 mm and a depth of 200 mm, and the spray pipe 1 described in Example 1 is used.

[0046] First, the upper air pipe 2 and the upper water pipe 3 are assembled on the spray pipe 1.

[0047] The spray pipe 1 is fixedly connected to the upper ventilation pipe 2 by threads until the guide plate 6 abuts against the ventilation pipe 2, at which time the spray pipe 1 is tightly connected to the ventilation pipe 2. Then the check valve 4 is installed, the check valve 4 is threadedly connected to the water nozzle, and the water pipe 3 is flange-connected to the check valve 4. A water temperature sensor and a water pressure sensor are installed on the upper water pipe 3, and a gas temperature sensor and a gas pressure sensor are installed on the upper ventilation pipe 2. The water temperature sensor, the water pressure sensor, the gas temperature sensor, and the gas pressure sensor are respectively connected to the external controller to monitor the temperature and pressure of the gas and water in real time, and to adjust the spray parameters in real time. Then the external air pump and water pump are respectively threadedly connected to the ventilation pipe 2 and the water pipe 3 until they are tightly connected. Fix the upper connected part at the center of the elongated cavity of the workpiece.

[0048] The ventilation pipe 2 and the water pipe 3 are installed at the lower part of the spray pipe 1.

[0049] Thread the check valve 4 to the lower water nozzle 8 until they are tightly connected. The water pipe 3 is flange-connected to the check valve 4. Thread the spray pipe 1 to the lower ventilation pipe 2 until the guide plate 6 abuts against the ventilation pipe 2. At this time, the spray pipe 1 is tightly connected to the lower ventilation pipe 2. Install a water temperature sensor and a water pressure sensor on the lower water pipe 3, install a gas temperature sensor and a gas pressure sensor on the lower ventilation pipe 2, and connect the water temperature sensor, water pressure sensor, gas temperature sensor, and gas pressure sensor to the external controller respectively. Thread the external air pump and water pump to the lower ventilation pipe 2 and the lower water pipe 3 respectively until they are tightly connected. At this point, the entire device is installed. The schematic diagram of the use status of the spray cooling device is shown as follows Fig.12 shown.

[0050] In the engineering example, the upper and lower water pipes 3, ventilation pipes 2 and check valves 4 can be assembled in advance. When cooling, the upper assembled part and the lower assembled part only need to be screwed together with the spray pipe 1 through the thread until they are tightly connected, and then the controller, air pump and water pump can be connected.

[0051] When cooling, first turn on the upper and lower air pumps at the same time, until the parameters of the gas temperature sensor and gas pressure sensor of the ventilation pipe 2 are stable, then turn on the water pumps connected to the upper and lower water pipes 3 at the same time, and the gas and water form a high-speed spray in the ventilation pipe 2 near the spray pipe 1, and finally spray out from the slit nozzle 5 to form a high-speed and uniform spray to achieve a good cooling effect. The nozzle spray speed can reach 100m / s, and the cooling speed can reach up to 300℃ / min.

[0052] After cooling is completed, the upper assembled part or the lower assembled part is reversely twisted out of the spray pipe 1 to open it, and the spray pipe 1 is taken out of the workpiece cavity.

[0053] According to the different depths of the elongated cavity of the workpiece, spray pipes 1 of different lengths are selected for cooling.

[0054] Therefore, the internal mixing type narrow slit high-speed spray cooling device and its application described in the present invention can solve the problem of poor quenching quality of slender cavity structure parts caused by existing spray cooling devices.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An internal mixing type narrow slit high-speed spray cooling device, comprising a spray pipe, characterized in that: At least one end of the spray pipe is provided with a ventilation pipe, which is connected to an air pump, and a water pipe is provided on the ventilation pipe, which is connected to a water pump, and a check valve is provided on the water pipe. The air pump and the water pump are both electrically connected to a controller; a spray flow channel with large apertures at both ends and a small aperture in the middle is provided inside the spray pipe, and a plurality of slit nozzles are provided on the side wall of the spray pipe, and the slit nozzles are connected to the spray flow channel.

2. The internal mixing type narrow slit high-speed spray cooling device according to claim 1, characterized in that: The slit nozzles are evenly distributed on the side wall of the spray pipe, the outer ends of the slit nozzles are located on the same circumference, and the sum of the areas of the longitudinal sections of the spray pipe is smaller than the sum of the areas at the inlets of the ventilation pipe.

3. The internal mixing type narrow slit high-speed spray cooling device according to claim 1, characterized in that: The length of the slit nozzle is 200mm-600mm, the inner diameter of the end of the spray pipe is 30mm-40mm, and the curvature radius of the spray pipe is 500mm-5000mm.

4. The internal mixing type narrow slit high-speed spray cooling device according to claim 1, characterized in that: The length of the spray flow channel is 200mm-600mm, the curvature radius of the spray flow channel is 500mm-5000mm, and the width of the spray flow channel is 1mm-5mm.

5. The internal mixing type narrow slit high-speed spray cooling device according to claim 1, characterized in that: The mist outlet end of the slit nozzle is provided with a guide plate, which is fixed on the spray pipe and has guide holes for spraying water mist.

6. The internal mixing type narrow slit high-speed spray cooling device according to claim 5, characterized in that: The mist inlet end of the guide hole is a conical structure with a large end opening width and a small middle opening, and the mist outlet end of the guide hole is a bell-mouth structure with an angle of 90°-150°. The narrowest width of the guide hole is 0.2mm-5mm.

7. The internal mixing type narrow slit high-speed spray cooling device according to claim 1, characterized in that: The ventilation pipe is provided with a gas temperature sensor and a gas pressure sensor, the ventilation pipe is sleeved outside the spray pipe, the ventilation pipe is threadedly connected to the spray pipe, and the gas temperature sensor and the gas pressure sensor are both electrically connected to the controller.

8. The internal mixing type narrow slit high-speed spray cooling device according to claim 1, characterized in that: The ventilation pipe is provided with a water nozzle, which is connected to the water pipe through a check valve. The water pipe is provided with mounting holes for mounting a water temperature sensor and a water pressure sensor. The water temperature sensor and the water pressure sensor are both electrically connected to the controller.

9. The internal mixing type narrow slit high-speed spray cooling device according to claim 8, characterized in that: The check valve comprises a valve body, one end of which is connected to a water nozzle, a flange plate is provided at the other end of the valve body, a connecting hole is provided on the flange plate, the valve body is connected to a water pipe through the connecting hole, a sealing gasket is provided between the flange plate and the water pipe, a valve disc is provided inside the water inlet end of the valve body, a valve stem arranged axially along the valve body is provided on the valve disc, a mounting seat is fixedly provided inside the valve body, a through hole for the valve stem to pass through is provided on the mounting seat, the valve stem is slidably connected to the mounting seat, a spring is provided between the valve disc and the mounting seat, the valve disc contacts the inner wall of the valve body under the action of the spring, a valve cover is provided at the water outlet end of the valve body, a water through hole is provided in the center of the valve cover, the area of ​​the water through hole is smaller than the water inlet area of ​​the valve body, and the inner diameter of the water through hole is smaller than the inner diameter of the water nozzle.

10. An application of an internal mixing type narrow slit high-speed spray cooling device as claimed in any one of claims 1 to 9, characterized in that: The internal mixing narrow slit high-speed spray cooling device is used in the quenching of parts with slender cavity structures, and the spray speed of the nozzle is 30m / s-200m / s.

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