Multi-nozzle array in cooperation with high-speed spray cooling device

Abstract

A kind of multi-nozzle array cooperates high-speed spray cooling device, belong to mechanical part heat treatment auxiliary device technical field.The nozzle of the device is installed on sprayer, is placed on bottom support, overall is located below support frame, the hole is opened in the middle of support frame, and the disc part to be processed is placed on it, nozzle is located directly below disc part.Sprayer is hollow disc structure, and internal cavity is divided into two layers of chambers, upper chamber is gas storage cavity connected with air pump, lower chamber is water storage cavity connected with water pump, and multiple concentric thread holes are arranged on the upper wall of gas storage cavity for installing nozzle.Water in water storage cavity reaches the top outlet of nozzle, and gas in gas storage cavity reaches the top outlet of nozzle simultaneously, adjust air pump and water pump, and spray is generated in nozzle cap after gas-liquid mixing, and reaches disc surface.The present application can realize the purpose that gas flow and water flow of each nozzle are uniform, and uniform and effective spray is generated by the method that gas outlet surrounds water outlet, so that each part of the part can be fully cooled.

Description

Technical Field

[0001] This invention belongs to the technical field of auxiliary devices for heat treatment of mechanical parts, and specifically relates to a multi-nozzle array coordinated high-speed spray cooling device. Background Technology

[0002] Heat treatment of mechanical parts refers to the processing method of heating, holding, and cooling parts in a solid state in an appropriate manner. Heat treatment is an important means to improve the internal structural defects of parts, enhance their machinability, improve their mechanical properties, and extend their service life. Therefore, most parts in critical areas must undergo heat treatment. Commonly used heat treatment methods include quenching, tempering, annealing, and normalizing. Quenching refers to heating metal to a specified temperature and then rapidly cooling it. Quenching is a crucial step in the heat treatment process; almost all components requiring specific mechanical properties require quenching cooling treatment.

[0003] Traditional spray systems often exhibit the "Leidenfrost effect" during quenching operations. This effect occurs when a liquid droplet, upon contact with a solid surface with a boiling point much higher than its own, rapidly forms a vapor film, causing the droplet to remain suspended above the vapor layer without contacting the solid surface. Traditional spray systems typically produce large droplets, usually on the millimeter scale. This significantly prolongs the evaporation time of the droplets during the "Leidenfrost effect," resulting in excessively long residence time on the part's surface. Consequently, the droplets fail to quickly remove heat from the surface, drastically reducing cooling efficiency. While air cooling is effective, the specific heat of the cooling gas is lower than that of water, leading to poor thermal conductivity and making it difficult to meet the required cooling speed under specific conditions.

[0004] To address the aforementioned issues, there is an urgent need for innovative designs based on existing spray-type and air-blowing-type coolers. Summary of the Invention

[0005] To address the above problems, this invention provides a multi-nozzle array coordinated high-speed spray cooling device, which can not only rapidly cool mechanical parts during heat treatment and ensure quenching speed, but also avoid the "Leidenfrost effect" and effectively guarantee cooling efficiency. Furthermore, this device has a large number of nozzles and can be applied to the cooling of large disc-shaped parts, thus having certain application value.

[0006] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0007] A multi-nozzle array coordinated high-speed spray cooling device includes a sprayer 1, a support frame 9, a bottom bracket 10, and nozzles 7. The nozzles 7 are installed on the sprayer 1 and placed on the bottom bracket 10, with the entire device located below the support frame 9. The support frame 9 has an opening in the middle with a diameter smaller than that of a disc 8. The disc 8 to be processed is placed on the upper surface of the support frame 9, and the nozzles 7 are located directly below the disc 8.

[0008] The sprayer 1 has a hollow disc-shaped structure. Its internal cavity is divided into upper and lower chambers by a partition plate 2. The upper chamber is an air storage chamber 3, and the lower chamber is a water storage chamber 4. The water storage chamber 4 has circumferentially distributed threaded holes 4 for water inlet, which are connected to quick-connect fittings and connected to a water pump 5 via a water pipe. The air storage chamber 3 has circumferentially distributed threaded holes for air inlet for quick-connect fittings and is connected to an air pump 6 via an air pipe. The upper wall of the air storage chamber 3 has multiple concentric conical threaded holes for installing nozzles 7.

[0009] Furthermore, the separator 2 is a disc structure with multiple concentric stepped holes, the center of which corresponds to the center of the disc 8; all the stepped holes on the separator correspond to and are concentric with all the conical pipe thread holes on the upper wall of the gas storage chamber.

[0010] Furthermore, a sealing ring 12 is installed on each stepped hole of the separator 2.

[0011] Furthermore, the nozzle 7 body is a stepped columnar structure, divided into front and rear sections, with the outer diameter of the rear section being smaller than that of the front section. The rear section is a hollow, slender column 31, which passes through the stepped hole on the partition plate and connects to the water storage chamber 4. The slender column 31 is provided with a frustum 32 for pressing the sealing ring 12. The lower part of the front column is machined with a tapered pipe thread to fit into the tapered pipe thread hole on the sprayer 1. Two opposing planes are machined in the middle for easy clamping. The upper part is machined with a straight thread for installing the nozzle cap 11. There is a raised frustum at the center of the top of the front column, which is used to draw out water flow. Several vertically penetrating satellite holes 33 are opened around it, which are directly connected to the air storage chamber 3. The front and rear sections are through-hole 34 structures along the axial direction of the slender column 31. Water in the water storage chamber 4 reaches the top outlet of the nozzle 7 through the through hole of the slender column 31. At the same time, gas in the gas storage chamber 3 reaches the top outlet of the nozzle 7 through the satellite hole 33. After adjusting the air pump 6 and water pump 5, the gas and liquid are mixed and a spray is generated in the nozzle cap 11. The spray is ejected from the small hole of the nozzle cap 11 and reaches the surface of the disc 8.

[0012] Furthermore, the nozzle cap 11 has a frustum structure with an internal cavity and a small straight hole machined on the top for spraying.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] (1) This invention proposes a device for improving the cooling rate of workpieces by using spray. By designing the upper and lower arrangement of the gas storage chamber and the water storage chamber, and designing the flow ratio of water flow to air flow, the gas flow and water flow of each nozzle are made uniform. Finally, the method of gas outlet surrounding water outlet is used to generate uniform and effective spray, which can avoid the low air cooling efficiency and the "Leidenfrost effect" phenomenon in spray cooling, and consume less water.

[0015] (2) Furthermore, the present invention integrates the gas path and the water path. The slender column of the nozzle passes through the collective hole on the partition plate and is connected to the water storage chamber. The satellite hole of the nozzle is directly connected to the gas storage chamber. After the water rises to the outlet of the nozzle frustum, it mixes with the gas ejected from the satellite hole and generates a spray in the nozzle cap.

[0016] (2) The present invention has a faster cooling speed than traditional cooling pool cooling or spray cooling. The present invention only needs to connect the device to a water pump and a compressor (air pump) to generate a spray. The cooling speed is fast. Experiments have shown that the fastest speed can reach 600℃ / min. Furthermore, nozzles of different lengths can be designed according to the outline of the parts so that all parts of the parts can be fully cooled. Attached Figure Description

[0017] Figure 1 This is a schematic diagram illustrating the working principle of the spray device.

[0018] Figure 2 This is a top view of the sprayer.

[0019] Figure 3 This is a schematic cross-sectional view of the nozzle structure.

[0020] Figure 4 This is a schematic diagram of the nozzle cap.

[0021] In the diagram: 1. Sprayer; 2. Divider plate; 3. Air storage chamber; 4. Water storage chamber; 5. Water pump; 6. Air pump; 7. Nozzle; 8. Disc; 9. Support frame; 10. Bottom bracket; 11. Nozzle cap; 12. Sealing ring;

[0022] 31 Slender column; 32 Frustum; 33 Satellite hole; 34 Through hole.

[0023] Specific implementation form

[0024] The following is in conjunction with the appendix Figure 1-4 The present invention will be described in further detail below.

[0025] A multi-nozzle array coordinated high-speed spray cooling device includes a sprayer 1, a support frame 9, a bottom bracket 10, and nozzles 7. The nozzles 7 are installed on the sprayer 1 and placed on the bottom bracket 10, with the entire device located below the support frame 9. The support frame 9 has an opening in the middle with a diameter smaller than that of a disc 8. The disc 8 to be processed is placed on the upper surface of the support frame 9, and the nozzles 7 are located directly below the disc 8. The sprayer 1 is disc-shaped with an outer diameter of 245mm, an inner diameter of 225mm, and a thickness of 54mm. The interior is hollow and divided into upper and lower chambers by a partition plate. The upper chamber is an air storage chamber, and the lower chamber is a water storage chamber. The water storage chamber has evenly distributed circumferentially distributed water inlet threaded holes on its outer periphery, which are connected to quick-connect fittings and connected to a water pump via a water pipe. The upper wall of the water storage chamber is the partition plate. On the partition plate, there are three concentric circles with radii of 90mm, 55mm, and 25mm, respectively, 19, 13, and 5 stepped holes for installing sealing rings. The outer circumference of each stepped hole is 12mm, the inner circumference is 4mm, the outer circumference is 2mm deep, and the inner circumference is 8mm deep. The upper cavity of the partition plate is the air storage chamber. The outer circumference of the air storage chamber has evenly distributed circular inlet threaded holes for installing quick-connect fittings, and is connected to the compressor via an air pipe. On the upper wall of the air storage chamber, with the center of the disc as the center, three concentric circles with radii of 90mm, 55mm, and 25mm respectively have 19, 13, and 5 NPT 1 / 4 tapered pipe threaded holes for installing nozzles. All the tapered pipe threaded holes on the upper wall of the air storage chamber are concentric with all the stepped holes on the partition plate.

[0026] The nozzle 7 body is a stepped columnar structure, divided into front and rear sections. The rear section is a slender column 31 with a frustum 32 for pressing the sealing ring 12. The lower part of the front column is machined with NPT tapered pipe threads to fit the sprayer 1. Two opposing planes are machined in the middle for easy clamping. The upper part is machined with straight threads for installing the nozzle cap 11. There is a raised frustum 2mm high at the center of the top of the front column, with several through-holes 33 around it. A through hole 34 is drilled from the center of the nozzle from the frustum to the bottom of the slender column.

[0027] The nozzle cap 11 has a frustum structure with an internal cavity and a small hole with a diameter of 2mm machined on the top for spraying.

[0028] Example 1

[0029] This embodiment provides a rapid spray cooling device for disc-shaped parts. The device includes a sprayer 1, six water inlet threaded holes, and six air inlet threaded holes. The water inlet threaded holes are M6, and the air inlet threaded holes are M8. The device has an outer diameter of 245mm, an inner diameter of 225mm, a wall thickness of 10mm, an upper and lower cavity partition plate 2 with a thickness of 10mm, and a total height of 54mm. It has a disc-shaped appearance. The nozzle is approximately 60mm long. The rear slender column 31 is 26mm long and 4mm in diameter. A frustum 32 on the slender column is approximately 10mm from the end of the column and is 2mm thick. The front section of the nozzle is 23mm long and 14mm in diameter, with six satellite holes 33, each located on a circle with a diameter of 7.5mm and evenly distributed. The top frustum of the front section of the nozzle has a diameter of 4mm and a height of 2mm. The through hole 34 at the center of the nozzle has a diameter of 2mm. The workpiece is made of 304 stainless steel, and is disc-shaped with a diameter of 242mm and a thickness of 39mm. The selected air pump (6) has a pressure of 0.8MPa, and the selected water pump (5) has a flow rate of 1200L / h. The operating steps are as follows:

[0030] The spray device is supported on bracket 10, and the disc 8 is supported on bracket 9. Sealing rings 12 are installed in the stepped grooves of the spray device partition plate 2. The inner surface of the sealing ring fits tightly with the slender column 31 of the nozzle 7. The nozzle 7 is tightened until the end of the slender column 31 is flush with the upper wall of the water storage chamber 4. During this process, the frustum 32 on the slender column 31 presses against the sealing rings 12. The water inlet threaded holes on the outer periphery of the water storage chamber 4 fit tightly with quick-connect fittings and are connected to the water pump 5. The air inlet threaded holes on the outer periphery of the air storage chamber 3 fit with quick-connect fittings and are connected to the air pump 6. The water pump 5 is turned on until the water flow from each nozzle is uniform. Then the air pump 6 is turned on, and the air pump 6 is adjusted to achieve a liquid-to-air ratio of approximately 1:100. The spray is ejected from the nozzle cap 11 and rapidly cools the disc, with an average cooling rate of up to 500℃ / min.

[0031] Example 2

[0032] This embodiment provides a rapid spray cooling device for turbodisc-shaped parts. The device includes a sprayer 1 with 6 sprayer water inlet threaded holes and 6 air inlet threaded holes respectively. The specification of the water inlet threaded holes is M6, and the specification of the air inlet threaded holes is M6. The outer diameter of the device is 250 mm, the inner diameter is 230 mm, the wall thickness is 10 mm, the upper and lower cavity partition plate 2 is 10 mm thick, the total height is 54 mm, and the appearance is disc-shaped. The total length of the nozzle is about 60 mm. The length of the rear slender column 31 is 26 mm, the diameter is 4 mm. The frustum 32 on the slender column is about 10 mm away from the end of the slender column. The frustum 32 is 2 mm thick. The length of the front section of the nozzle is 23 mm, the diameter is 14 mm, and there are six satellite holes 33. Each hole is located on a circle with a diameter of 7.5 mm and is equally spaced. The diameter of the top frustum of the front section of the nozzle is 4 mm and the height is 2 mm. The diameter of the through hole 34 at the center of the nozzle is 2 mm. The workpiece material is 304 stainless steel, and the appearance profile is "convex" shaped. The maximum diameter of the contour is 242 mm, the thickness is 15 mm, the diameter of the "convex" frustum is 115 mm, and the thickness is 10 mm. The selected air pump 6 has a pressure of 3 Mpa, and the selected water pump 5 has a flow rate of 1500 L / h. The operation steps are as follows:

[0033] Support the spray device on the bracket 10, support the disc part 8 on the bracket 9. Install the sealing rings 12 in the stepped hole grooves of the spray device partition plate 2. The inner ring surface of the sealing ring is closely fitted with the slender column of the nozzle 7, and tighten the nozzle 7 until the end of the slender column 31 is flush with the upper wall of the water storage cavity 4. During this process, the frustum 32 on the slender column 31 will press the sealing ring 12 tightly. Each water inlet threaded hole on the outer periphery of the water storage cavity 4 is closely fitted with a quick connector and connected to the water pump 5. Each air inlet threaded hole on the outer periphery of the air storage cavity 3 is fitted with a quick connector and connected to the air pump 6. Open the water pump 5 until the water flow rate from each nozzle is uniform, and then open the air pump 6. Adjust the air pump 65 to make the liquid-gas ratio reach about 1:100. The spray is ejected from the hole of the nozzle cap 11 and quickly cools the disc part 8. The average cooling rate can reach up to 600 °C / min at the fastest.

[0034] The above embodiments only represent the implementation modes of the present invention, but should not be construed as limiting the scope of the present invention patent. It should be noted that for those skilled in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A multi-nozzle array coordinated high-speed spray cooling device, characterized in that, The high-speed spray cooling device includes a sprayer (1), a support frame (9), a bottom bracket (10), and a nozzle (7); the nozzle (7) is installed on the sprayer (1), placed on the bottom bracket (10), and the whole is located below the support frame (9). The support frame (9) has an opening in the middle with a diameter smaller than that of the disc (8). The disc (8) to be processed is placed on the upper surface of the support frame (9), and the nozzle (7) is located directly below the disc (8). The sprayer (1) has a hollow disc-shaped structure. Its internal cavity is divided into upper and lower chambers by a partition plate (2). The upper chamber is a gas storage chamber (3), and the lower chamber is a water storage chamber (4). The separator (2) is a disc structure with multiple concentric stepped holes on it. The center of the multiple stepped holes corresponds to the center of the disc (8). The upper wall of the gas storage chamber (3) is provided with multiple concentric conical conical pipe thread holes for installing nozzles (7). The stepped holes on the separator are concentric with the conical pipe thread holes on the upper wall of the gas storage chamber. The nozzle (7) body is a stepped columnar structure, divided into front and rear sections. The outer diameter of the rear section is smaller than that of the front section. Specifically: The rear section structure is a hollow slender column (31), which passes through the stepped hole of the partition plate and communicates with the water storage chamber (4); the lower part of the column of the front section structure is fitted with the conical pipe thread hole on the sprayer (1), and the upper part is fitted with the nozzle cap (11). There is a raised truncated cone at the center of the top of the front section column, which is used to draw out the water flow. Several satellite holes (33) are opened around it, which are connected to the air storage chamber (3); the front and rear sections are through holes (34) along the axial direction of the slender column (31).

2. The multi-nozzle array coordinated high-speed spray cooling device according to claim 1, characterized in that, The water storage chamber (4) has a water inlet threaded hole on its outer periphery and is connected to the water pump (5) through a water pipe; the air storage chamber (3) has an air inlet threaded hole on its outer periphery and is connected to the air pump (6) through an air pipe.

3. The multi-nozzle array coordinated high-speed spray cooling device according to claim 1, characterized in that, A sealing ring (12) is installed on each stepped hole of the partition plate (2).

4. The multi-nozzle array coordinated high-speed spray cooling device according to claim 1, characterized in that, The specific structure of the nozzle (7) is as follows: In the rear section structure, a frustum (32) is provided on the slender column (31) for pressing the sealing ring (12); The lower part of the column of the front section is machined with a tapered pipe thread structure to fit into the tapered pipe thread hole on the sprayer (1). Two opposing planes are machined in the middle for clamping. The upper part is machined with a straight thread for installing the nozzle cap (11). Water in the water storage chamber (4) reaches the top outlet of the nozzle (7) through the through hole of the slender column (31), while gas in the gas storage chamber (3) reaches the top outlet of the nozzle (7) through the satellite hole (33). After adjusting the air pump (6) and water pump (5), the gas and liquid are mixed and a spray is generated in the nozzle cap (11), which is sprayed out from the small hole of the nozzle cap (11) to the surface of the disc (8).

5. The multi-nozzle array coordinated high-speed spray cooling device according to claim 1, characterized in that, The nozzle cap (11) has a frustum structure with an internal cavity and a small straight hole at the top for spraying.

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