Thin-wall butterfly valve casting system
By adding insulation risers and trapezoidal slopes on the flange surface under the thin-walled butterfly valve casting, the problem of thermal stress concentration and uneven retraction in the thin-walled butterfly valve casting system is solved, and the crack resistance and processing quality of the casting are improved.
Patent Information
- Application Number
- CN202422646782.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-10-31
AI Technical Summary
The existing thin-walled butterfly valve casting system is concentrated in heat at the inner gate, resulting in concentrated thermal stress, easy to produce cracks, and unevenly shrinkage of the upper flange surface, easily forming thermal cracks and shrinkage holes.
Six insulation risers are added to the flange surface under the thin-walled butterfly valve casting, the number of inner gates is increased to four, and a trapezoidal slope is set up on the upper flange surface, and the insulation risers are reasonably arranged to dissipate heat, reduce thermal stress concentration, and enhance the shrinkage effect.
It effectively avoids cracks caused by thermal stress concentration on the lower flange surface of the casting, reduces residue residue on the upper flange surface, and improves the overall quality and crack resistance of the casting.
Smart Images
Figure CN223300850U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a thin-wall butterfly valve casting system, belonging to the technical field of thin-wall butterfly valve production. Background Art
[0002] Thin-walled butterfly valves are mainly used in the chemical, pharmaceutical, papermaking and other industries. They belong to the field of mechanical control equipment and require high precision. Its material is CF8M, with an outline size of approximately 1300*1000*280mm; the part weight is 220Kg, and the main body wall thickness is 18mm. This thin-walled butterfly valve has the following difficulties: 1. The structure is complex, the outline size is very large, reaching 1300mm, and it is easy to deform. 2. The wall thickness difference is relatively large, and the wall thickness of the left and right flanges and the main body flange at the shaft hole is uneven. The solidification shrinkage stress is large, and it is very easy to produce crack defects. 3. The wall thickness is thin, the main body wall thickness is 18mm, and the shrinkage feeding distance is short. Multiple risers need to be arranged for shrinkage feeding. Improper riser arrangement can easily cause cracks at the risers.
[0003] Reference Figure 4 Current technology is incomplete and suffers from the following drawbacks: 1. Because there are only two ingates, heat concentrates at the molten steel inlet, causing cracks near the ingates. 2. The lower flange is quenched with chill iron, without any shrinkage fluid, resulting in shrinkage cavities. 3. The riser on the upper flange is too large, resulting in low casting strength at the riser and the formation of thermal cracks.
[0004] In order to solve one of the above problems, a thin-wall butterfly valve casting system is urgently needed. Utility Model Content
[0005] In view of the above deficiencies in the prior art, the technical problem to be solved by the present invention is: how to add six insulating risers A to the lower flange surface of the casting to compensate for the shrinkage of the lower flange surface, and the four ingates enter from four insulating risers A in symmetrical positions, which can disperse the heat at the ingates and avoid cracks caused by thermal stress concentration. For this purpose, a thin-walled butterfly valve casting system is provided.
[0006] The thin-walled butterfly valve casting system described in the present invention includes a thin-walled butterfly valve casting and a pouring cup for receiving the pouring liquid. The thin-walled butterfly valve casting has a symmetrically arranged valve neck A and a valve neck B, and is characterized in that six groups of insulation risers A are arranged at intervals on the inner wall of the lower flange of the thin-walled butterfly valve casting, two groups of insulation risers A adjacent to the valve neck A are connected through an ingrowth channel A, and two groups of insulation risers A adjacent to the valve neck B are connected through an ingrowth channel B. The ingrowth channels A and ingrowth channels B are connected through a cross runner, a straight runner is connected to the cross runner, and a pouring cup is arranged at the other end of the straight runner.
[0007] The number of ingates is increased to four, and six insulating risers A are added to the lower flange surface of the casting to compensate for shrinkage. The risers are evenly distributed and avoid the outer tie bars (hot spot position) of the casting, but are close to the tie bar position (hot spot position). The four ingates enter from four symmetrically positioned insulating risers A, which can disperse the heat at the ingates and avoid cracks caused by thermal stress concentration.
[0008] Preferably, the six groups of thermal insulation risers A are arranged around the center line of the thin-walled butterfly valve casting.
[0009] Preferably, the bottom of the thermal insulation riser A has an inner gate connected to the thermal insulation riser A or the thermal insulation riser B.
[0010] Preferably, a set of insulation risers B is provided on each of the valve necks A and B, and two sets of insulation risers C are provided on the upper flange of the thin-walled butterfly valve casting. The insulation risers B and C are arranged around the centerline of the thin-walled butterfly valve casting, with the angle between adjacent ones being 90 degrees. This keeps the thermal node away from the shaft hole and reduces the tendency of the shaft hole to crack.
[0011] Preferably, four groups of thermal insulation risers D are provided on the upper flange of the thin-walled butterfly valve casting, and each group of thermal insulation risers D is located between adjacent thermal insulation risers B and thermal insulation risers C.
[0012] Preferably, chills are provided on the lower flange and the lower flange surface of the thin-walled butterfly valve casting.
[0013] Preferably, the upper flange of the thin-walled butterfly valve casting has six sets of trapezoidal slopes. Six trapezoidal slopes are added to the upper flange surface and placed below the six top risers to make the molten steel flow in a trend, so that slag is gathered at the slope positions, reducing slag on the processing surface.
[0014] Preferably, the diameters of the insulating riser A, insulating riser B, insulating riser C and insulating riser D are different and can be set as needed.
[0015] Preferably, the center of the thin-wall butterfly valve casting is filled with a weight-reducing block. When making the core, a φ300 weight-reducing block is placed in the middle of the main core to increase the yield of the sand core.
[0016] Compared with the prior art, the present invention has the following beneficial effects:
[0017] In the thin-wall butterfly valve casting system described in the present invention, the number of ingates is increased to four, and six insulation risers A are added to the lower flange surface of the casting to compensate for the shrinkage of the lower flange surface. The four ingates enter from four insulation risers A at symmetrical positions, which can disperse the heat at the ingates and avoid cracks caused by thermal stress concentration.
[0018] The thin-wall butterfly valve casting system of the utility model has six trapezoidal slopes added to the upper flange surface and placed below six top risers, so that the molten steel has a flow tendency and the slag is gathered at the slope positions, thereby reducing the slag on the processing surface.
[0019] In the thin-walled butterfly valve casting system described in the present invention, a group of insulation risers B are respectively provided on the valve neck A and the valve neck B, and two groups of insulation risers C are provided on the upper flange of the thin-walled butterfly valve casting. The insulation risers B and the insulation risers C are arranged around the center line of the thin-walled butterfly valve casting, and the angle between the two adjacent ones is 90 degrees, so that the hot node is away from the shaft hole and the tendency of the shaft hole to crack is reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.
[0021] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 ;
[0022] Figure 2 This is a schematic diagram of the structure of the utility model Figure 2 ;
[0023] Figure 3 This is a schematic diagram of the structure of the utility model Figure 3 ;
[0024] Figure 4 Schematic diagram of the simulation results of the original casting defects (from the Huazhu simulation analysis software, it can be seen that after the original process completed pouring and cooling, a large number of shrinkage cavities existed inside the casting).
[0025] In the figure: 1. Thin-walled butterfly valve casting 2. Gate cup 3. Sprue 4. Runner 5. Ingate A 6. Ingate 7. Insulation riser A 8. Insulation riser B 9. Insulation riser C 10. Insulation riser D 11. Chill 12. Trapezoidal slope 13. Weight reduction block. DETAILED DESCRIPTION
[0026] The present invention will be further described below in conjunction with the accompanying drawings: The present invention will be further illustrated below through specific embodiments, but it is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
[0027] Example 1, as Figure 1-2As shown, a thin-walled butterfly valve casting system includes a thin-walled butterfly valve casting 1 and a pouring cup 2 for receiving the pouring liquid, the thin-walled butterfly valve casting 1 has a symmetrically arranged valve neck A and valve neck B, six groups of insulation risers A7 are arranged at intervals on the inner wall of the lower flange of the thin-walled butterfly valve casting 1, the two groups of insulation risers A7 adjacent to the valve neck A are connected through an ingrowth channel A5, and the two groups of insulation risers A7 adjacent to the valve neck B are connected through an ingrowth channel B, the ingrowth channel A5 and the ingrowth channel B are connected through a cross runner 4, the cross runner 4 is connected to a straight runner 3, and a pouring cup 2 is arranged at the other end of the straight runner 3.
[0028] The number of ingates is increased to four, and six insulating risers A7 are added to the lower flange surface of the casting to compensate for shrinkage. The six risers are evenly distributed and avoid the outer tie bars (hot spots) of the casting, but are close to the tie bars (hot spots). The four ingates enter from four symmetrically located insulating risers A7, which can disperse the heat at the ingates and avoid cracks caused by thermal stress concentration.
[0029] Example 2, as Figure 1-3 As shown, a thin-walled butterfly valve casting system includes a thin-walled butterfly valve casting 1 and a pouring cup 2 for receiving the pouring liquid, the thin-walled butterfly valve casting 1 has a symmetrically arranged valve neck A and valve neck B, six groups of insulation risers A7 are arranged at intervals on the inner wall of the lower flange of the thin-walled butterfly valve casting 1, the two groups of insulation risers A7 adjacent to the valve neck A are connected through an ingrowth channel A5, and the two groups of insulation risers A7 adjacent to the valve neck B are connected through an ingrowth channel B, the ingrowth channel A5 and the ingrowth channel B are connected through a cross runner 4, the cross runner 4 is connected to a straight runner 3, and a pouring cup 2 is arranged at the other end of the straight runner 3.
[0030] Furthermore, the six groups of thermal insulation risers A7 are arranged around the center line of the thin-walled butterfly valve casting 1.
[0031] Furthermore, the bottom of the insulation riser A7 has an inner gate 6 connected to the insulation riser A7 or the insulation riser B.
[0032] Furthermore, a set of insulation risers B8 is provided on each of the valve necks A and B, and two sets of insulation risers C9 are provided on the upper flange of the thin-walled butterfly valve casting 1. The insulation risers B8 and C9 are arranged around the centerline of the thin-walled butterfly valve casting 1, with the angle between adjacent ones being 90 degrees. This keeps the thermal node away from the shaft hole and reduces the tendency of the shaft hole to crack.
[0033] Furthermore, four groups of thermal insulation risers D10 are provided on the upper flange of the thin-walled butterfly valve casting 1 , and each group of the thermal insulation risers D10 is respectively located between adjacent thermal insulation risers B8 and thermal insulation risers C9 .
[0034] Furthermore, chills 11 are provided on the lower flange and the lower flange surface of the thin-walled butterfly valve casting 1 .
[0035] Furthermore, the upper flange of the thin-walled butterfly valve casting 1 has six sets of trapezoidal slopes 12. Six trapezoidal slopes are added to the upper flange surface and placed below the six top risers to make the molten steel flow and gather slag at the slope position, reducing slag on the processing surface.
[0036] Furthermore, the diameters of the thermal insulation riser A7, the thermal insulation riser B8, the thermal insulation riser C9 and the thermal insulation riser D10 are different and are set as needed.
[0037] Furthermore, the center of the thin-wall butterfly valve casting 1 is filled with a weight-reducing block 13. When making the core, a φ300 weight-reducing block is placed in the middle of the main core to increase the yield of the sand core.
[0038] In the thin-wall butterfly valve casting system described in the present invention, the number of ingates is increased to four, and six insulation risers A are added to the lower flange surface of the casting to compensate for the shrinkage of the lower flange surface. The four ingates enter from four insulation risers A at symmetrical positions, which can disperse the heat at the ingates and avoid cracks caused by thermal stress concentration.
[0039] The thin-wall butterfly valve casting system of the utility model has six trapezoidal slopes added to the upper flange surface and placed below six top risers, so that the molten steel has a flow tendency and the slag is gathered at the slope positions, thereby reducing the slag on the processing surface.
[0040] In the thin-walled butterfly valve casting system described in the present invention, a group of insulation risers B are respectively provided on the valve neck A and the valve neck B, and two groups of insulation risers C are provided on the upper flange of the thin-walled butterfly valve casting. The insulation risers B and the insulation risers C are arranged around the center line of the thin-walled butterfly valve casting, and the angle between the two adjacent ones is 90 degrees, so that the hot node is away from the shaft hole and the tendency of the shaft hole to crack is reduced.
[0041] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.
[0042] Any matters not described in detail in the present invention are well-known technologies to those skilled in the art.
Claims
1. A thin-wall butterfly valve casting system, comprising a thin-wall butterfly valve casting (1) and a pouring cup (2) for receiving pouring liquid, wherein the thin-wall butterfly valve casting (1) has a valve neck A and a valve neck B that are symmetrically arranged, and is characterized in that: Six groups of thermal insulation risers A (7) are arranged at intervals on the inner wall of the lower flange of the thin-walled butterfly valve casting (1), two groups of thermal insulation risers A (7) adjacent to the valve neck A are connected through an ingrowth channel A (5), and two groups of thermal insulation risers A (7) adjacent to the valve neck B are connected through an ingrowth channel B, and the ingrowth channels A (5) and the ingrowth channels B are connected through a cross runner (4), and a straight runner (3) is connected to the cross runner (4), and a pouring cup (2) is provided at the other end of the straight runner (3).
2. The thin-wall butterfly valve casting system according to claim 1, characterized in that: The six groups of heat-insulating risers A (7) are arranged around the center line of the thin-walled butterfly valve casting (1).
3. The thin-wall butterfly valve casting system according to claim 2, characterized in that: The bottom of the thermal insulation riser A (7) has an inner gate (6) connected to the thermal insulation riser A (7) or the thermal insulation riser B.
4. The thin-wall butterfly valve casting system according to claim 3, characterized in that: A set of thermal insulation risers B (8) is respectively provided on the valve neck A and the valve neck B, and two sets of thermal insulation risers C (9) are provided on the upper flange of the thin-walled butterfly valve casting (1). The thermal insulation risers B (8) and the thermal insulation risers C (9) are arranged around the center line of the thin-walled butterfly valve casting (1), and the angle between the two adjacent ones is 90 degrees.
5. The thin-wall butterfly valve casting system according to claim 4, characterized in that: Four groups of thermal insulation risers D (10) are provided on the upper flange of the thin-walled butterfly valve casting (1), and each group of the thermal insulation risers D (10) is located between adjacent thermal insulation risers B (8) and thermal insulation risers C (9).
6. The thin-wall butterfly valve casting system according to claim 5, characterized in that: The lower flange and the lower flange surface of the thin-walled butterfly valve casting (1) are both provided with chills (11).
7. The thin-wall butterfly valve casting system according to claim 6, characterized in that: The upper flange of the thin-wall butterfly valve casting (1) is provided with six groups of trapezoidal slopes (12).