A mold steel cryogenic treatment liquid nitrogen uniform spraying device

Abstract

This utility model discloses a liquid nitrogen uniform spraying device for cryogenic treatment of mold steel, belonging to the mold manufacturing field. It includes a cryogenic chamber, a liquid nitrogen tank supplying liquid nitrogen to the cryogenic chamber, and a control console for controlling the internal cooling components of the cryogenic chamber. The advantages of this utility model compared to existing technologies are: a rake-shaped distribution pipe is welded to the inner wall of the cryogenic chamber, and a liquid nitrogen electromagnetic stop valve is installed at the spray port of the rake-shaped distribution pipe to control the opening and closing of the spiral diffusion liquid nitrogen atomizing nozzle. The opening and closing of the liquid nitrogen electromagnetic stop valve is controlled by a liquid nitrogen pressure sensor connected to the top surface of the five-port distribution plate of the liquid nitrogen tank. When the pressure of the five-port distribution plate is stable, the rake-shaped distribution pipe is filled with nitrogen, and the spray force of each spray port is the same, thus ensuring the uniformity of the spiral diffusion liquid nitrogen atomizing nozzle spray. Furthermore, since no other motor equipment is involved in the entire spraying process, the cooling effect of the nitrogen is entirely utilized on the mold, thereby ensuring the mold's precision.

Description

Technical Field

[0001] This utility model relates to the field of mold manufacturing, specifically to a liquid nitrogen uniform spraying device for cryogenic treatment of mold steel. Background Technology

[0002] In modern industrial manufacturing, optimizing the performance of metallic materials is a key step in improving product quality. Cryogenic treatment, as an important material modification technology, significantly improves the mechanical properties of materials by altering their microstructure in an extremely low-temperature environment. Liquid nitrogen tanks, due to their high efficiency and stability, have become an indispensable core piece of equipment in cryogenic treatment processes. In the cryogenic treatment of mold steel, liquid nitrogen is mostly sprayed through pipes, and to ensure uniform spraying, the cryogenic chamber contains cooling components capable of evenly distributing the liquid nitrogen.

[0003] The existing cooling system is indirectly controlled via a console. The cooling process of the cryogenic chamber is as follows: preparation (first, the vent valve of the liquid nitrogen tank is closed, then the pressure boosting valve is opened. Due to partial vaporization of liquid nitrogen, the internal pressure of the liquid nitrogen tank increases), liquid nitrogen flow (after the internal pressure of the liquid nitrogen tank increases, the liquid nitrogen outlet valve is opened, and liquid nitrogen is forced out of the tank and enters the cryogenic chamber through a pneumatic diaphragm regulating valve), liquid nitrogen vaporization (after entering the cryogenic chamber, the liquid nitrogen is sprayed out through a nozzle. Because the temperature of the chamber is higher than that of the liquid nitrogen, the liquid nitrogen rapidly vaporizes, expands in volume, and its temperature drops), and workpiece cooling (an axial flow fan blows cryogenic nitrogen into the working chamber to cool the workpiece).

[0004] While this cooling process can cool the mold, the atomization of liquid nitrogen gas is achieved by blowing it in with a fan. When the fan blows in the nitrogen, it generates a certain amount of heat. In order to eliminate this heat, a certain amount of nitrogen is used to cool the mold, which affects the accuracy of the mold cooling. Utility Model Content

[0005] The technical problem this invention aims to solve is that the blower inside the existing liquid nitrogen uniform spraying device for cryogenic treatment of mold steel can affect the amount of liquid nitrogen used for mold cooling. Once the liquid nitrogen supply is insufficient, it will affect the quality of the mold.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: a liquid nitrogen uniform injection device for cryogenic treatment of mold steel, including a cryogenic chamber, a liquid nitrogen tank for supplying liquid nitrogen to the cryogenic chamber, and a control console for controlling the cooling components inside the cryogenic chamber, wherein the cryogenic chamber is a rectangular box.

[0007] The cooling assembly includes a five-port distribution plate connected to the output end of the liquid nitrogen tank via a liquid nitrogen pipeline, a rake-shaped distribution pipe welded to the four distribution ports on the side of the five-port distribution plate, and several spray nozzles located on the rake teeth of the rake-shaped distribution pipe. The spray nozzles pass through the inner wall of the cryogenic chamber, and a liquid nitrogen electromagnetic stop valve and a spiral diffusion liquid nitrogen atomizing nozzle are connected in sequence above the spray nozzles.

[0008] The top surface of the five-port diversion plate is equipped with a liquid nitrogen pressure sensor that passes through the five-port diversion plate, and the opening and closing of the liquid nitrogen electromagnetic stop valve is controlled by the liquid nitrogen pressure sensor.

[0009] As an improvement, the inner wall of the cryogenic chamber is welded with an atomizing mesh partition, and the outer wall of the cryogenic chamber is provided with a heat insulation layer.

[0010] As an improvement, the base of the cryogenic chamber passes through the bottom surface of the insulation layer, and the injection port of the five-port distribution plate passes through the center of the bottom surface of the insulation layer.

[0011] As an improvement, a three-way pipe is provided between the output pipe of the liquid nitrogen tank and the injection port of the five-port distribution plate, and a drain valve is provided on the bottom surface of the three-way pipe.

[0012] As an improvement, the liquid nitrogen pressure sensor and the liquid nitrogen solenoid valve are connected to the control console via a data cable.

[0013] As an improvement, the injection port is connected to the through hole in the inner wall of the cryogenic chamber by welding, and the top surface of the insulation layer and the top surface of the atomizing mesh partition are both welded to the top surface of the inner wall of the cryogenic chamber through insulation plates.

[0014] The advantages of this invention compared to existing technologies are as follows: A rake-shaped diverter pipe is welded to the inner wall of the cryogenic chamber, and a liquid nitrogen electromagnetic stop valve is installed on the spray port of the rake-shaped diverter pipe to control the opening and closing of the spiral diffusion liquid nitrogen atomizing nozzle. The opening and closing of the liquid nitrogen electromagnetic stop valve is controlled by a liquid nitrogen pressure sensor connected to the top surface of the five-port diverter plate of the liquid nitrogen tank. When the pressure of the five-port diverter plate is stable, the rake-shaped diverter pipe is filled with nitrogen, and the spray force of each spray port is the same, thus ensuring the uniformity of the spray of the spiral diffusion liquid nitrogen atomizing nozzle. Since no other motor equipment is involved in the entire spraying process, the cooling effect of the nitrogen is used entirely on the mold, thus ensuring the accuracy of the mold. Attached Figure Description

[0015] Figure 1 This is a general structural diagram of a liquid nitrogen uniform spraying device for cryogenic treatment of mold steel according to this utility model.

[0016] Figure 2 This is a cross-sectional view of the top surface of the cryogenic chamber of a liquid nitrogen uniform spraying device for cryogenic treatment of mold steel according to this utility model.

[0017] Figure 3 This is a front sectional view of the overall structure of a liquid nitrogen uniform spraying device for cryogenic treatment of mold steel according to this utility model.

[0018] Figure 4 This is a structural diagram of the cooling component of a liquid nitrogen uniform spraying device for cryogenic treatment of mold steel according to this utility model.

[0019] As shown in the figure: 1. Cryogenic chamber; 11. Atomizing mesh partition; 12. Insulation layer; 13. T-shaped pipe; 14. Drain valve; 2. Liquid nitrogen tank; 3. Cooling components; 31. Five-port distribution plate; 32. Rake-shaped distribution pipe; 33. Injection port; 34. Liquid nitrogen electromagnetic check valve; 35. Spiral diffusion liquid nitrogen atomizing nozzle; 36. Liquid nitrogen pressure sensor; 4. Control console. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] As per the instruction manual Figure 1 , 2 As shown in Figures 3 and 4, the existing liquid nitrogen uniform spraying device for cryogenic treatment of mold steel consists of a cryogenic chamber 1, a liquid nitrogen tank 2 that supplies liquid nitrogen to the cryogenic chamber 1, and a control console 4 that controls the internal cooling components 3 of the cryogenic chamber 1. The cryogenic chamber 1 is generally a rectangular box, and the box cover is connected by a snap-fit ​​box body.

[0022] To ensure stable cooling and uniform cooling of the cooling component 3, the cooling component 3 includes a five-port distribution plate 31 connected to the output end of the liquid nitrogen tank 2 via a liquid nitrogen pipeline, a rake-shaped distribution pipe 32 welded to the four distribution ports on the side of the five-port distribution plate 31, and several spray nozzles 33 located on the rake teeth of the rake-shaped distribution pipe 32. The spray nozzles 33 pass through the inner wall of the cryogenic chamber 1, and above the spray nozzles 33 are a liquid nitrogen electromagnetic stop valve 34 and a spiral diffusion liquid nitrogen atomizing nozzle 35 connected in sequence. The spiral diffusion design of the spiral diffusion liquid nitrogen atomizing nozzle 35 enables liquid nitrogen to vaporize at multiple points, resulting in strong atomization ability and better spraying effect.

[0023] The stability of the internal pressure of the injection port 33 is controlled by the liquid nitrogen pressure sensor 36 on the top surface of the five-port distribution plate 31. The liquid nitrogen pressure sensor 36 passes through the top surface of the five-port distribution plate 31. The opening and closing of the liquid nitrogen electromagnetic stop valve 34 is controlled by the liquid nitrogen pressure sensor 36. The liquid nitrogen pressure sensor 36 and the liquid nitrogen electromagnetic stop valve 34 are connected to the control console 4 through a data cable. The control console 4 monitors whether the liquid nitrogen pressure sensor 36 is in a stable state. When the data is stable, it means that the liquid nitrogen gas has filled each injection port 33 of the rake-shaped distribution pipe 32, thereby ensuring the stability of the spiral diffusion liquid nitrogen atomizing nozzle 35 spray.

[0024] To ensure that the mold does not damage the injection port 33, an atomizing mesh partition 11 is welded to the inner side of the inner wall of the cryogenic chamber 1, and an insulation layer 12 is provided on the outer wall end of the cryogenic chamber 1. In order to ensure the load-bearing capacity of the cryogenic chamber 1, the base of the cryogenic chamber 1 passes through the bottom surface of the insulation layer 12, and the injection port of the five-port diverter 31 passes through the center of the bottom surface of the insulation layer 12.

[0025] To ensure the airtightness of the cryogenic chamber 1, the injection port 33 is connected to the through hole in the inner wall of the cryogenic chamber 1 by welding, and the top surface of the insulation layer 12 and the top surface of the atomizing mesh partition 11 are both welded to the top surface of the inner wall of the cryogenic chamber 1 through insulation plates.

[0026] To ensure the safety of the rake-shaped diversion pipe 32 after cooling and to discharge the liquid nitrogen gas in the pipe, a three-way pipe 13 is provided between the output pipe of the liquid nitrogen tank 2 and the injection port of the five-port diversion plate 31, and a drain valve 14 is provided on the bottom surface of the three-way pipe 13. The drain valve 14 is generally connected to the liquid nitrogen recovery tank.

[0027] In the specific implementation of this utility model, the mold is placed in the cryogenic chamber 1, and then the liquid nitrogen tank 2 is started, so that liquid nitrogen flows sequentially into the five-port distribution plate 31, the rake-shaped distribution pipe 32 and the spray nozzle 33. When the pressure of the liquid nitrogen pressure sensor 36 above the five-port distribution plate 31 reaches the target value, each liquid nitrogen electromagnetic stop valve 34 is activated, so that the nitrogen gas atomized by the spiral diffusion liquid nitrogen atomizing nozzle 35 floats over the atomizing mesh partition 11 and enters the cooling area of ​​the cryogenic chamber 1, and sprays the mold evenly, thereby ensuring the uniform cooling of the mold.

[0028] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A liquid nitrogen uniform spraying device for cryogenic treatment of mold steel, comprising a cryogenic chamber (1), a liquid nitrogen tank (2) for supplying liquid nitrogen to the cryogenic chamber (1), and a control console (4) for controlling the internal cooling components (3) of the cryogenic chamber (1), wherein the cryogenic chamber (1) is a rectangular box, characterized in that: The cooling assembly (3) includes a five-port distribution plate (31) connected to the output end of the liquid nitrogen tank (2) via a liquid nitrogen pipeline, a rake-shaped distribution pipe (32) welded to the four distribution ports on the side of the five-port distribution plate (31), and a number of spray nozzles (33) located on the rake teeth of the rake-shaped distribution pipe (32). The spray nozzles (33) pass through the inner wall of the cryogenic chamber (1), and a liquid nitrogen electromagnetic stop valve (34) and a spiral diffusion liquid nitrogen atomizing nozzle (35) are connected in sequence above the spray nozzles (33). The top surface of the five-port diversion plate (31) is provided with a liquid nitrogen pressure sensor (36) that passes through the five-port diversion plate (31), and the opening and closing of the liquid nitrogen electromagnetic stop valve (34) is controlled by the liquid nitrogen pressure sensor (36).

2. The liquid nitrogen uniform spraying device for deep treatment of die steel according to claim 1, characterized in that: The inner wall of the cryogenic chamber (1) is welded with an atomizing mesh partition (11), and the outer wall of the cryogenic chamber (1) is provided with a heat insulation layer (12).

3. The liquid nitrogen uniform spraying device for cryogenic treatment of a die steel according to claim 2, characterized in that: The base of the cryogenic chamber (1) passes through the bottom surface of the insulation layer (12), and the injection port of the five-port distribution plate (31) passes through the center of the bottom surface of the insulation layer (12).

4. The liquid nitrogen uniform spraying device for cryogenic treatment of die steel according to claim 1, characterized in that: A three-way pipe (13) is provided between the output pipe of the liquid nitrogen tank (2) and the injection port of the five-port distribution plate (31), and a drain valve (14) is provided on the bottom surface of the three-way pipe (13).

5. The liquid nitrogen uniform spraying device for cryogenic treatment of die steel according to claim 1, characterized in that: The liquid nitrogen pressure sensor (36) and the liquid nitrogen solenoid valve (34) are connected to the control console (4) via a data cable.

6. The liquid nitrogen uniform spraying device for cryogenic treatment of mold steel according to claim 1, characterized in that: The injection port (33) is connected to the through hole of the inner wall of the cryogenic chamber (1) by welding, and the top surface of the insulation layer (12) and the top surface of the atomizing mesh partition (11) are welded to the top surface of the inner wall of the cryogenic chamber (1) through the insulation plate.

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