Adjustable chilling chill
By setting heat exchange pipes and inlet/outlet air ducts on the chill, the Bernoulli effect is used to achieve medium flow, which solves the problem that the chill cannot be continuously chilled, increases the amount of graphite and refines the matrix structure of the casting, improves the performance of the casting and avoids defects.
Patent Information
- Application Number
- CN202422576050.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-24
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2034-10-24
AI Technical Summary
Existing chills cannot continuously and rapidly cool castings during the solidification process, leading to graphite distortion and a decline in casting performance. Furthermore, traditional cooling methods are prone to causing casting defects or safety accidents.
Design an adjustable chiller, combined with cooling components including heat exchange tubes, air outlet ducts and air inlet ducts, to create a suction effect through the Bernoulli effect, achieving efficient flow of the cooling medium, carrying away the heat absorbed by the chiller, and forming continuous chilling.
This method achieves uniform cooling of the casting, increases the amount of graphite and refines the matrix structure, improves the performance of the casting, and avoids casting defects and safety hazards.
Smart Images
Figure CN223733810U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of casting technology, specifically to an adjustable chiller. Background Technology
[0002] Composition and cooling rate during solidification are two aspects that affect the properties and microstructure of castings. Given a fixed composition, the cooling rate during solidification is a crucial control factor, determining the quality of the as-cast microstructure. In machine tool castings and ultra-thick, large-section ductile iron castings, prolonged solidification can lead to graphite distortion and growth, severely deteriorating mechanical properties. Therefore, it is necessary to actively explore appropriate rapid cooling during solidification to address the aforementioned graphite distortion problem.
[0003] Although cooling methods include chills, air cooling, and water cooling, chills are still the primary means of cooling special castings during solidification. However, chills can only rapidly cool a localized or partial area of the cast iron and cannot continuously cool the casting for an extended period. This can easily lead to inconsistencies, resulting in problems such as abnormal graphite and color variations in the casting. Air cooling and water cooling control technologies are more difficult to implement, and improper handling can easily cause casting defects or even safety accidents. Summary of the Invention
[0004] The purpose of this invention is to address the problems existing in the prior art by providing an adjustable chiller.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0006] An adjustable chiller includes a chill body and a cooling assembly used in conjunction with the chill body. The cooling assembly includes a heat exchange tube and an air outlet duct connected to one end of the heat exchange tube. The air outlet duct has an air inlet duct at one end near the end where it intersects with the heat exchange tube. The inner diameter of the air inlet duct and the inner diameter of the heat exchange tube are both smaller than the inner diameter of the air outlet duct. At least one side of the chill body has a groove, and the heat exchange tube is arranged along the groove.
[0007] The groove is conveniently and effectively connected to the heat exchange tube. As a cooling groove, it can exchange heat with the cooling medium flowing through the heat exchange tube, allowing the cooling medium to carry away the heat and thus reduce the temperature of the chill, which is called rapid cooling. This accelerates the cooling of the casting, especially the molten iron at thick sections and hot spots, so that the cooling and solidification rate can be balanced with other parts.
[0008] The cooling assembly, through the arrangement of heat exchange pipes, air inlet pipes, and air outlet pipes with different inner diameters, can form a suction effect with Bernoulli effect, realize and enhance the flow of cooling media such as air, water, and oil in the heat exchange pipes, remove the heat absorbed by the chilled iron (or casting), and enable the chilled iron body to be continuously cooled.
[0009] Furthermore, the chill body has a cooling working surface, which is arranged facing the mold during use to exchange heat with the casting or molten iron; the groove is provided on the surface opposite to the cooling working surface and / or on both sides.
[0010] Furthermore, the chill body is a rectangular block, the groove is a rectangular groove, an arc groove, a triangular groove or a polygonal groove, and the outer contour of the heat exchange tube is adapted to the inner contour of the groove.
[0011] Furthermore, the central axis of the air outlet duct is perpendicular to the central axis of the heat exchange tube, or the air outlet duct is arranged obliquely on the heat exchange tube; the air inlet duct and the air outlet duct are arranged coaxially.
[0012] In some embodiments, the heat exchange tube is a telescopic cooling tube, which facilitates adjustment of the tube length and can be adapted to castings of various lengths.
[0013] In some embodiments, the end of the heat exchange tube away from the air outlet tube may also be detachably connected to a splicing extension tube, which can be adapted to longer large casting cavities.
[0014] Furthermore, the ends of the heat exchange pipe and the splicing pipe are provided with mutually matching flange structures or tongue and groove structures to connect the two pipes.
[0015] Furthermore, the air inlet pipe is connected to the air compressor via a hose and is equipped with a control valve, and one end of the heat exchange pipe is exposed to the air or connected to a cold source via a pipeline.
[0016] In some embodiments, the heat exchange tube is provided with a plurality of heat exchange branches at intervals.
[0017] Furthermore, the depth and width of the groove are both 20-50 mm, and the length extends through the chill. For example, the dimensions (depth × width) of the groove are 20*20 mm, 25*25 mm, 30*30 mm, 35*35 mm, 40*40 mm, and 50*50 mm, etc.
[0018] Compared with the prior art, the beneficial effects of this utility model are: 1. A cooling component is connected to the chill, which can greatly exert the cooling and heat conduction function of the chill during the casting and solidification process, allowing the chill to conduct away the heat it absorbs, and forming a deeper level of chilling. This strengthens the control of the matrix structure during the casting process, increases the amount of graphite, refines the matrix structure, and refines the lamellar spacing, thereby improving the performance of the casting; 2. The groove is opened on the surface of the chill, which is convenient and can also connect the heat exchange tube well. The groove acts as a cooling tank, which can exchange heat with the cooling medium flowing in the heat exchange tube, allowing the cooling medium to carry away the heat, thereby reducing the temperature of the chill and accelerating the casting process. 3. The cooling pipe assembly, through the arrangement of heat exchange pipes, air inlet pipes and air outlet pipes with different inner diameters, can form a suction effect with Bernoulli effect, realize and enhance the flow of cooling media such as air, water and oil in the heat exchange pipes, remove the heat absorbed by the chill, and enable the chill to be continuously cooled; 4. Heat is removed by suction, which realizes heat dissipation without causing adverse effects on the casting or producing related defects. Even if there are gaps at the connection, due to the negative pressure suction, the air will not enter the sand core, sand mold and mold cavity; 5. After using this chill for casting production, the pearlite content in the microstructure of ultra-thick and slow-cooling casting test blocks is significantly increased, by at least 5% to 20%. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the structure of the chill body of this utility model;
[0020] Figure 2 This is a schematic diagram of another structure of the chill body of this utility model;
[0021] Figure 3 This is a schematic diagram of the cooling component of this utility model;
[0022] Figure 4 This is a partial schematic diagram of the use of the chill body and cooling components of this utility model (viewed from the bottom of the chill body upwards);
[0023] Figure 5 This is a partial schematic diagram (top view) of another arrangement of the chilled iron body and cooling components used in conjunction with this utility model;
[0024] Figure 6 This is a schematic diagram of the connection between the heat exchange tube and the splicing tube of this utility model;
[0025] Figure 7 This is a schematic diagram of another structure for connecting the heat exchange tube and the splicing tube of this utility model;
[0026] Figure 8 This is a schematic diagram of another structure of the cooling component of this utility model;
[0027] In the diagram: 1. Chill body; 101. Groove; 102. Cooling working surface; 2. Heat exchange pipe; 3. Air outlet pipe; 4. Air inlet pipe; 5. Flexible hose; 6. Connecting pipe; 7. Flange edge; 8. Sealing gasket; 9. Tongue and groove structure; 10. Heat exchange branch pipe. Detailed Implementation
[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0029] In the description of this utility model, it should be noted that the terms "middle," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0030] like Figures 1-5 As shown, an adjustable chiller includes a chiller body 1 and a cooling assembly used in conjunction with the chiller body 1. The cooling assembly includes a heat exchange tube 2 and an air outlet duct 3 connected to one end of the heat exchange tube 2. The air outlet duct 3 has an air inlet duct 4 at one end near the end where it intersects with the heat exchange tube 2. The inner diameters of both the air inlet duct 4 and the heat exchange tube 2 are smaller than the inner diameter of the air outlet duct 3. At least one side of the chiller body 1 has a groove 101, and the heat exchange tube 2 is arranged along the groove 101.
[0031] The groove 101 is opened on the surface of the chill body 1, which is convenient and can also connect the heat exchange tube 2 well. The groove 101 serves as a cooling groove, which can exchange heat with the cooling medium flowing in the heat exchange tube 2, allowing the cooling medium to carry away the heat, thereby reducing the temperature of the chill, which is to form a rapid cooling, allowing the casting to cool down faster. In particular, the molten iron at thick sections and hot spots can be cooled quickly to achieve a balanced cooling and solidification rate with other parts.
[0032] The cooling assembly, through the arrangement of heat exchange pipes 2 with different inner diameters, air inlet pipes 4 and air outlet pipes 3, can form a suction effect with Bernoulli effect, realize and enhance the flow of cooling media such as air, water and oil in the heat exchange pipes, remove the heat absorbed by the chilled iron (or casting), and enable the chilled iron body to be continuously cooled.
[0033] Specifically, the cross-sectional dimension of the air inlet pipe 4 is smaller than that of the air outlet pipe 3, and the cross-sectional dimension of the air inlet pipe 4 is equivalent to or one size larger than that of the heat exchange pipe 2. Since the inner diameter of the air inlet pipe 4 is smaller and the inner diameter of the air outlet pipe 3 is larger, when the air enters the air outlet pipe 3 from the air inlet pipe 4, the air suddenly changes from a high-speed, low-pressure state in the small cavity to a low-speed, high-pressure state in the large cavity (relatively speaking), forming a negative pressure. The negative pressure can draw the cooling medium at the other end of the heat exchange pipe 2, allowing the cooling medium to pass through the heat exchange pipe 2 and enter the air outlet pipe 3, and then be discharged together with the air. In this process, the cooling medium carries away the heat of the chill body, thus cooling the chill.
[0034] The suction method with Bernoulli effect used in this method has significant advantages over other chill cooling methods.
[0035] For example, when using hollow chills, effective connection of the chills cannot be achieved, and the implementation process is extremely complex, increasing workload. Air enters from one side of the chill and exits from the other, leading to adverse effects. If air enters the mold cavity and then the casting, it can cause unnecessary defects such as porosity. When using chills with a central connecting steel pipe, the amount of machining required is large (requiring the creation of through holes), and the sealing of the pipe joints is crucial. If air leaks at the joints, air can blow into the sand core, sand mold, and even the mold cavity, causing additional quality problems in the casting.
[0036] When adopting this method for the chill body and cooling pipe layout, heat is removed by suction and extraction, achieving heat dissipation without adversely affecting the casting or causing related defects. Even if there are gaps at the connection, due to the negative pressure suction, air will not enter the sand core, sand mold, and mold cavity.
[0037] In the casting process, chills are not only placed on thick sections and / or hot spots of the casting, but cooling components are also connected to the chills. During the casting pouring and solidification process, the chills greatly enhance their cooling and heat conduction functions, allowing them to dissipate absorbed heat and achieve deeper chilling. This strengthens the control of the matrix structure during casting, increasing the amount and refining the graphite content and lamellar spacing, thus improving casting performance. The basic structure of cast iron is determined by its chemical composition and cooling rate. When the composition is constant, the cooling rate becomes the decisive factor affecting the matrix structure. Especially for cast iron materials requiring a pearlitic matrix structure, it is necessary to enhance the overall chilling effect and speed, and to adjust and implement rapid chilling. Adjustable and deeper chilling of the chills used in the casting process allows them to play a positive role.
[0038] Furthermore, the chill body 1 has a cooling working surface 102, which faces the mold during use. The groove 101 is provided on the surface opposite to the cooling working surface 102 and / or on both sides. Therefore, one heat exchange tube or multiple heat exchange tubes can be provided.
[0039] The cooling working surface 102 of the chill is also provided with a sand coating layer. The thickness of the sand coating layer should be controlled between 3-6 mm. That is to say, when the chill is embedded, the cooling working surface is also covered with sand. Depending on its placement position, the sand coating layer is flush with the outer surface of the sand core or sand mold, and then refractory coating is applied together to form a refractory coating. The purpose of this setting is to give full play to the chill's cooling effect, while also preventing the molten iron poured into the mold cavity from melting the chill or sticking to the chill, so as not to reduce the cooling effect of the chill, and also to prevent the chill from sticking to the casting after the casting has solidified and being difficult to clean, or even causing surface quality problems of the casting.
[0040] Furthermore, the chill body 1 is a rectangular block, the groove 101 is a rectangular groove, an arc groove, a triangular groove or a polygonal groove, and the outer contour of the heat exchange tube 2 is adapted to the inner contour of the groove 101.
[0041] Furthermore, the central axis of the air outlet duct 3 is perpendicular to the central axis of the heat exchange tube 2, or the air outlet duct 3 is arranged obliquely on the heat exchange tube 2; the air inlet duct 4 is coaxially arranged with the air outlet duct 3. This arrangement ensures that the air outlet duct does not discharge air towards the casting sand box or pit, which helps the extracted hot air to quickly disperse into the external space and not accumulate near the sand box or pit.
[0042] In some embodiments, the heat exchange tube 2 is a telescopic cooling tube, which allows for flexible adjustment of the length of the heat exchange tube to accommodate the production of castings of different lengths.
[0043] In some implementations, such as Figure 6 and Figure 7 As shown, the end of the heat exchange pipe 2 furthest from the air outlet pipe 3 is detachably connected to a splicing pipe 6. For large castings of 5m or more, or even 10m or more, the length of the heat exchange pipe can be extended by splicing pipes to adapt it to longer casting cavities.
[0044] Furthermore, the ends of the heat exchange pipe 2 and the splicing pipe 6 are provided with mutually matching flange structures. After the flange edges 7 are connected, they can be fastened with bolts. A sealing gasket 8 can also be set between the flange edges 7.
[0045] Alternatively, the ends of the heat exchange tube 2 and the splicing tube 6 are provided with tongue and groove structures 9 that cooperate with each other, and are connected by plugging. This connection method is simple and convenient.
[0046] Furthermore, the air inlet pipe 4 is connected to the air compressor via a flexible hose 5 and is equipped with a control valve, and one end of the heat exchange pipe 2 is exposed to the air or connected to a cold source via a pipeline.
[0047] An air compressor provides compressed air to the air inlet pipe. The control valve has a controller that can adjust the air pressure entering the air inlet pipe 4. During the casting cooling process, the air pressure can be stabilized at around 0.6 MPa. The other end of the heat exchange pipe 2, which is the suction end, can directly draw in external cold air for heat exchange, or it can be connected to a cooling medium such as water or oil to achieve a better cooling effect.
[0048] In some implementations, such as Figure 8 As shown, the heat exchange tube 2 is provided with several heat exchange branch pipes 10 at intervals. The heat exchange branch pipes 10 can be used to connect multiple rows of chills in series or in parallel to work together to achieve a cooling effect.
[0049] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An adjustable chill, comprising a chill body, characterized in that, The cooling assembly is used in cooperation with the cold iron body, and comprises a heat exchange pipe and an air outlet pipe connected to one end of the heat exchange pipe.
2. The adjustable chill of claim 1, wherein, The cold iron body has a cooling working surface, and the cooling working surface is arranged towards a mold in use.
3. The adjustable chill of claim 1, wherein, The cold iron body is a rectangular block, and the recess is a rectangular slot, an arcuate slot, a triangular slot or a polygonal slot.
4. The adjustable chill of claim 1, wherein, The air outlet pipe is arranged on the heat exchange pipe in a vertical or inclined manner.
5. The adjustable chill of claim 1, wherein, The heat exchange pipe is a telescopic cooling pipe.
6. The adjustable chill of claim 1, wherein, The heat exchange pipe is detachably connected to a splicing pipe at one end away from the air outlet pipe.
7. The adjustable chill of claim 6, wherein, The heat exchange pipe and the splicing pipe are provided with flange edges or tongue-and-groove structures matched with each other at their ends.
8. The adjustable chill of claim 1, wherein, The air inlet pipe is connected to an air compressor through a hose and provided with a control valve.
9. The adjustable chill of claim 1, wherein, The heat exchange pipe is provided with a plurality of heat exchange branch pipes at intervals.
10. The adjustable chill of claim 1, wherein, The recess has a depth of 20-50 mm and a width of 20-50 mm.