Pitot tube all-silica sol precision casting system
The Pitot tube precision casting system addresses surface roughness and metallurgical issues by employing reinforced type cores and mixed pouring modes, enhancing production efficiency and quality for diverse specifications.
Patent Information
- Application Number
- CN202421857156.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-08-02
AI Technical Summary
The prior art is difficult to meet the surface roughness and internal metallurgical quality requirements of the internal special-shaped runner of Pito tubes, resulting in the equipment performance not meeting the standards, and the demand for multi-standard production has increased, and the preparation of Pito tube fittings has become a bottleneck.
The fully silicon sol precision casting system is adopted, including gate cups, horizontal runners, straight runners, inner gates and cores. The core strength is strengthened using a polymagnesium core, and the mixed casting mode of top and side betting is combined with the exhaust rod design to ensure that the alloy liquid enters the cavity stably and avoids impact.
It improves the pass rate and production efficiency of Pito tubes, solves problems such as insufficient strength in the runner, fire running, and fracture, and is suitable for efficient production of multi-spec Pito tube fittings.
Smart Images
Figure CN223097957U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of precision casting, in particular to a full silica sol precision casting system for pitot tube parts. Background Technique
[0002] The jet pump is a small-flow and high-lift centrifugal pump. The pitot tube is a key part that converts the potential energy and velocity energy of the conveyed liquid into pressure energy. The surface roughness and internal metallurgical quality in its flow channel directly affect the performance of the equipment. Its characteristic is that there is a special-shaped cavity flow channel inside the pitot tube. The difference between the water inlet (about Ø5mm) and the water outlet (about Ø25mm) is large, and the width of the internal special-shaped surface is about 30mm, and the thickness is about 5mm. During shell making, the sand cannot enter the flow channel, resulting in a low strength of the mold shell, which brings great difficulty to the production of full silica sol precision casting; in the previous production process, the use of sand cores can prepare castings, but the surface roughness of its flow channel cannot meet the technical requirements, resulting in the overall equipment performance not meeting the working conditions requirements; with the gradual improvement of customer technical requirements and the diversification of equipment specifications, the demand for pitot tube parts in multiple specifications has gradually increased; the preparation of pitot tube castings has become a bottleneck problem; therefore, in order to solve the above problems, it is imperative to develop the full silica sol precision casting technology for pitot tube parts. Summary of the Invention
[0003] The purpose of the utility model is to solve the above technical problems and provide a full silica sol precision casting system for pitot tube parts.
[0004] In order to achieve the above technical purpose and meet the above technical requirements, the technical solution adopted by the utility model is: a full silica sol precision casting system for pitot tube parts, including a pouring cup and a cross runner. The pouring cup is connected to the cross runner. A sprue is vertically arranged in the middle of the cross runner, and first inner gates are symmetrically arranged on both sides. The first inner gates are connected to the pitot tube. The lower part of the pitot tube is connected to the sprue through a second inner gate. The pitot tube includes a pitot tube outer shape, and a core is arranged inside the pitot tube outer shape. First core heads and second core heads for fixing are respectively arranged at both ends of the core.
[0005] Preferably: welding wire A is built into the first core head and the second core head to enhance the strength of the core. Before shell making, welding wire B is inserted into the wax part of the pitot tube outer shape to ensure the position of the core.
[0006] Preferably: a runner core is adopted. The core and the pitot tube outer shape become an integral body when pressing the wax mold and are placed in the same mold to produce an integral wax pattern.
[0007] Preferably: the core is set as a magnesium-based core.
[0008] Preferably, exhaust rods are symmetrically arranged on both sides of the runner, and the exhaust rods are connected to the pouring cup.
[0009] Preferably, the pouring cup is arranged in a conical shape.
[0010] Compared with the traditional structure, the beneficial effects of the present utility model are as follows:
[0011] 1. Compared with the traditional pouring system, by using a new material core in the present utility model, the problem of the pitot tube being scrapped due to the breakout caused by insufficient strength during the shell making of the pitot tube is solved, the strength inside the runner is satisfied, and the difficulty of the post-treatment sand cleaning process is reduced, making it easier to operate during the post-treatment mold shell cleaning and improving the production efficiency. In terms of the design of the pouring system, a mixed pouring mode of top pouring + side pouring is used, which can not only enable the alloy liquid to stably enter the cavity and not easily cause direct impact on the core, but also ensure sufficient feeding of each hot spot of the pitot tube, solving the phenomenon that the pitot tube was broken due to porosity defects in the past.
[0012] 2. During the preparation, a Ø1.5mm welding wire B was inserted into the wax part before shell making, ensuring the position of the core and ensuring that defects such as off-core, broken core, and core leakage do not occur, resulting in the scrapping of the casting.
[0013] 3. The exhaust rods on both sides are arranged on both sides of the runner, reasonably discharging the gas, avoiding the difficulty of gas escaping in the plane position, and improving the qualification rate of the pitot tube.
[0014] 4. The present utility model can be applied to the full silica sol precision casting production process of most pitot tube parts of various specifications, can ensure its surface and internal quality, and has a high qualification rate of the pitot tube. Description of the Drawings
[0015] Figure 1 It is a schematic diagram of the pouring system of the present utility model;
[0016] Figure 2 is Figure 1 the side view of;
[0017] Figure 3 is Figure 2 the A-A view in;
[0018] Figure 4 It is a schematic diagram of the cooperation between the outer shape of the pitot tube and the core of the present utility model;
[0019] Figure 5 is Figure 4 the side view of;
[0020] Figure 6 is Figure 5 the A-A view in;
[0021] In the figure: 1. Sprue cup, 2. Runner, 3. First ingate, 4. Pitot tube, 41. Outer shape of pitot tube, 42. Core, 421. First core head, 422. Second core head, 5. Wire B, 6. Second ingate, 7. Exhaust rod, 8. Downsprue. Detailed implementation mode
[0022] The present utility model will be further described below.
[0023] Refer to the appendix Figures 1-6 , a full silica sol precision casting system for a pitot tube part, comprising a sprue cup 1 and a runner 2, the sprue cup 1 is connected to the runner 2, a downsprue 8 is vertically arranged in the middle of the runner 2, and first ingates 3 are symmetrically arranged on both sides, the first ingates 3 are connected to the pitot tube 4, the lower part of the pitot tube 4 is connected to the downsprue 8 through a second ingate 6, the pitot tube 4 includes an outer shape 41 of the pitot tube, and a core 42 is arranged inside the outer shape 41 of the pitot tube, and first core heads 421 and second core heads 422 for fixing are respectively arranged at both ends of the core 42.
[0024] In this preferred embodiment, the first core head 421 and the second core head 422 are internally provided with wire A to enhance the strength of the core. Before shell making, a wire B 5 with a diameter of Ø1.5mm is inserted into the wax part of the outer shape 41 of the pitot tube to ensure the position of the core.
[0025] In this preferred embodiment, a runner core is adopted, and the core 42 and the outer shape 41 of the pitot tube become an integral body when pressing the wax mold.
[0026] In this preferred embodiment, the core 42 is set as a polymagnesium core, so that the full silica sol precision casting production of the pitot tube part is simple and efficient.
[0027] In this preferred embodiment, exhaust rods 7 are symmetrically arranged on both sides of the runner 2, and the exhaust rods 7 are connected to the sprue cup 1.
[0028] In this preferred embodiment, the sprue cup 1 is set as a cone.
[0029] During specific implementation, when pressing the wax mold, the first core head 421 and the second core head 422 are placed in the corresponding positions of the mold of the pitot tube for the core 42, and the overall wax mold of the outer shape 41 of the pitot tube is pressed. A polymagnesium core is adopted, and its refractoriness ≥ 2350 °C, bulk density 2.2 - 2.5 g / cm 3 , the minimum forming wall thickness is 0.50 mm, the linear shrinkage rate is 0.8%, the dimensional accuracy is ±0.05 mm / ±0.1%, and the surface roughness can be better than Ra1.6 μm. Its technical parameters fully meet the production requirements of the full silica sol precision casting process for the pitot tube part, and due to the particularity of its material, this kind of polymagnesium core can be detached only by vibration during cleaning, which is simple and easy to operate, and improves the qualification rate of the pitot tube.
[0030] In terms of the gating system design, as Figures 1-3 shown, it mainly consists of a sprue cup 1, a runner 2, an ingate 3, a pitot tube 4, an ingate 6, an exhaust rod 7, and a downsprue 8; the sprue cup 1 is directly connected to the runner 2, and the pitot tube 4 is connected to the runner 2 and the downsprue 8 through the ingate 3 and the ingate 6 respectively, and there are exhaust rods 7 on both sides of the runner 2. A mixed gating system of top gating + side gating is adopted to fully feed the key hot spots of the pitot tube; the two exhaust rods 7 are located on both sides of the runner 2 and connected to the sprue cup 1, which is beneficial to the discharge of gas, avoiding the problem that the gas in the cavity is difficult to discharge due to too fast pouring speed, and avoiding metallurgical defects such as porosity and blowholes in the casting, greatly improving the production efficiency and the quality of the pitot tube; the utility model is applicable to the production of pitot tubes of different specifications, and has high economic benefits and long-term application prospects.
[0031] Compared with the traditional gating system, the utility model can well slow down the direct scouring of the alloy liquid on the pitot tube core, making it fill the mold smoothly, avoiding the surface layer peeling, the dimensional deformation of the pitot tube, and the leakage of molten metal at the narrow part of the pitot tube caused by direct scouring of the core; reducing the possibility of eccentric core, core leakage, and core breakage; greatly improving the surface appearance quality of the pitot tube, solving the problem of the previous pitot tube breakage, and greatly improving the qualified rate of the pitot tube.
[0032] The above embodiments of the utility model are only examples clearly illustrating the utility model, but do not limit the protection scope of the utility model. All equivalent technical solutions also belong to the scope of the utility model. The patent protection scope of the utility model shall be defined by each claim.
Claims
1. A precision investment casting system for a pitot tube part entirely made of silica sol, comprising a pouring cup (1) and a cross runner (2), characterized in that: The sprue cup (1) is connected to the runner (2). A sprue (8) is vertically arranged in the middle of the runner (2), and first ingates (3) are symmetrically arranged on both sides. The first ingates (3) are connected to the pitot tube (4). The lower part of the pitot tube (4) is connected to the sprue (8) through a second ingate (6). The pitot tube (4) includes a pitot tube outer shape (41), and a core (42) is arranged inside the pitot tube outer shape (41). First core heads (421) and second core heads (422) for fixation are respectively arranged at both ends of the core (42).
2. The total silica sol precision casting system for pitot tube parts according to claim 1, characterized in that: Welding wire A is arranged inside the first core head (421) and the second core head (422) to enhance the strength of the core.
3. The total silica sol precision casting system for a pitot tube according to claim 1, wherein: A runner core is adopted, and the core (42) and the pitot tube outer shape (41) become an integral body when pressing the wax mold.
4. The total silica sol precision casting system for a pitot tube component according to claim 1 or 3, characterized in that: The core (42) is arranged as a polymagnesium core.
5. The total silica sol precision casting system for pitot tube parts according to claim 1, characterized in that: Exhaust rods (7) are symmetrically arranged on both sides of the runner (2), and the exhaust rods (7) are connected to the sprue cup (1).
6. The total silica sol precision casting system for a Pitot tube component according to claim 1 or 5, characterized in that: The sprue cup (1) is arranged as a cone.