Pressure reducing device of raw material pressure tank
The pressure reduction device of the raw material pressure tank with nested inner and outer tubes solves the problem of excessive pressure in the mold cavity, realizes the step-by-step pressure reduction and smooth conveying of foam particles, improves the quality of foam model and reduces maintenance costs.
Patent Information
- Application Number
- CN202520470853.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-03-18
AI Technical Summary
In existing technologies, excessive pressure inside the raw material pressure tank leads to excessive pressure inside the mold cavity, resulting in undermolding and bulging, which affects the quality of the foam model.
Design a pressure reducing device for a raw material pressure tank. It adopts a nested structure of inner and outer tubes, forming an annular pressure reducing chamber between the inner and outer tubes. It is equipped with an exhaust port and a material passage port to gradually reduce the pressure of the foam particles. The inner tube is divided into front and rear chambers by a baffle block to ensure smooth conveying of foam particles.
It effectively reduces the under-molding and bulging phenomena of foam models, improves the quality of foam models, reduces maintenance costs, and avoids clogging of complex valves and electronic control components.
Smart Images
Figure CN223924245U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a lost foam technology field, concretely relates to a raw material pressure tank pressure reducing device. BACKGROUND
[0002] Lost foam casting is a new type of casting method that the foam model similar to the size and shape of the casting is bonded and combined into a model cluster, the refractory coating is brushed and dried, and then buried in dry quartz sand for vibration molding, poured under negative pressure, the model is gasified, the liquid metal occupies the model position, and the casting is formed after solidification and cooling.
[0003] The foam particles in the raw material pressure tank are injected into the mold during the production of the foam model, so as to facilitate the molding of the foam model, however, when the pressure in the raw material pressure tank is too high, the pressure in the mold cavity will be too high, resulting in the phenomena of undercooking (the foam particles are not fully foamed) and mold expansion (the mold is deformed due to the high internal pressure), which leads to high waste rate of the foam model and affects the quality of the foam model, therefore, there are still defects and deficiencies in the prior art. CONTENT OF THE UTILITY MODEL
[0004] The utility model provides a raw material pressure tank pressure reducing device to solve the problems in the background art.
[0005] In order to solve the above technical problems, the utility model adopts the technical scheme of a raw material pressure tank pressure reducing device, which comprises an outer pipe, a plurality of exhaust holes with a hole diameter smaller than the outer diameter of the foam particles are uniformly arranged on the outer pipe, closed end covers are arranged at both ends of the outer pipe, an inner pipe is fixedly connected in the outer pipe between the two closed end covers, a feeding port is arranged on the closed end cover at the front end of the outer pipe and communicated with the inner pipe, a discharging port is arranged on the closed end cover at the rear end of the outer pipe and communicated with the inner pipe, and an annular pressure reducing cavity is formed between the inner side wall of the outer pipe and the outer side wall of the inner pipe.
[0006] A blocking piece is fixedly connected to the middle of the inner pipe, the inner part of the inner pipe is divided into a front cavity and a rear cavity by the blocking piece, a plurality of first material passing holes communicated with the annular pressure reducing cavity are uniformly arranged on the side wall of the front cavity, a plurality of second material passing holes communicated with the annular pressure reducing cavity are uniformly arranged on the side wall of the rear cavity, and the hole diameters of the first material passing holes and the second material passing holes are larger than the outer diameter of the foam particles.
[0007] Preferably, the outer pipe and the inner pipe are coaxially arranged.
[0008] Preferably, the closed end cover is conical.
[0009] Preferably, the two ends of the blocking piece are conical.
[0010] Preferably, a hollow cavity is arranged in the blocking piece, and the hollow cavity is filled with sound-absorbing material.
[0011] The utility model discloses a beneficial effect has as follows: (1) the utility model discloses through annular pressure relief cavity and exhaust hole cooperation, realize the multistage release of high pressure gas, to gradually reduce the delivery pressure of foam particle, and the foam particle is injected into the mould cavity again after decompression, make the internal pressure of mould cavity suitable, thereby can reduce the phenomenon of foam model clamping and rising mould, improve the quality of foam model, (2) when the foam particle passes through first pass -through hole and second pass -through hole, first pass -through hole and second pass -through hole can scatter the agglomerate foam particle, thereby can ensure that the foam particle delivery is smooth, (3) the utility model discloses the nested design of inner tube and outer tube, need not complex valve or electronic control element, and maintenance cost is low, and it is difficult to block. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 It is the structural schematic diagram of the utility model;
[0013] Figure 2 It is the structural schematic diagram of the utility model internal foam particle flow.
[0014] Fig. 1, outer tube, 2, exhaust hole, 3, closed end cap, 4, inner tube, 5, feed inlet, 6, discharge port, 7, annular pressure relief cavity, 8, material blocking block, 9, front cavity, 10, rear cavity, 11, first pass -through hole, 12, second pass -through hole, 13, sound -absorbing material. DETAILED DESCRIPTION
[0015] The utility model is further described below in connection with the drawings.
[0016] As Figures 1-2 The utility model discloses a raw material pressure tank pressure reducing device provides, including outer tube 1, the even several exhaust holes 2 of hole diameter less than foam particle outer diameter are seted up on outer tube 1, and the both ends of outer tube 1 are equipped with closed end cap 3, and the inner tube 4 in outer tube 1 is fixedly connected between two closed end caps 3, and the closed end cap 3 at outer tube 1 front end is equipped with with inner tube 4 intercommunication feed inlet 5, and the closed end cap 3 at outer tube 1 rear end is equipped with with inner tube 4 intercommunication discharge port 6, and the annular pressure relief cavity 7 is formed between the inner side wall of outer tube 1 and the outer side wall of inner tube 4, the middle fixed connection of inner tube 4 has material blocking block 8, and material blocking block 8 divides the inside of inner tube 4 into front cavity 9 and rear cavity 10, and the side wall on front cavity 9 is evenly equipped with several first pass -through holes 11 with annular pressure relief cavity 7 intercommunication, and the side wall on rear cavity 10 is evenly equipped with several second pass -through holes 12 with annular pressure relief cavity 7 intercommunication, and the hole diameter of first pass -through hole 11 and second pass -through hole 12 is greater than the outer diameter of foam particle.
[0017] Specifically, the raw material pressure tank is loaded with the mixture of high pressure gas and foam particle, when using, first, feed inlet 5 is connected with raw material pressure tank, and discharge port 6 is connected with material gun, and the flow path of foam particle in pressure reducing device is as shown inFigure 2 As shown, the foam particles enter the annular pressure reducing cavity 7 in turn through the feeding port 5, the front cavity 9 and the first material passing hole 11, then, when the foam particles are conveyed along the annular pressure reducing cavity 7, part of the high-pressure gas is discharged from the exhaust hole 2, so that the conveying pressure of the foam particles can be gradually reduced, then, the foam particles after pressure reduction enter the material gun in turn through the second material passing hole 12, the rear cavity 10 and the discharging port 6, and finally, the material gun injects the foam particles after pressure reduction into the mold cavity, so that the internal pressure in the mold cavity is appropriate, thereby the phenomena of undercooked and overcooked foam model can be reduced, and the quality of the foam model is improved; in addition, when the foam particles pass through the first material passing hole 11 and the second material passing hole 12, the first material passing hole 11 and the second material passing hole 12 can break up the caked foam particles, so that the smooth conveying of the foam particles can be ensured; the utility model adopts the nested design of the inner tube 4 and the outer tube 1, without complex valves or electronic control elements, the maintenance cost is low, and the utility model is not easy to be blocked.
[0018] In some embodiments, the outer tube 1 is coaxially arranged with the inner tube 4, so as to ensure the uniformity of the annular pressure reducing cavity 7, thereby reducing the local pressure concentration of the annular pressure reducing cavity 7.
[0019] In some embodiments, the closed end cover 3 is conical, and the two ends of the material blocking block 8 are conical, so that the foam particles can be guided, the accumulation of the foam particles is reduced, and the conveying efficiency is improved.
[0020] In some embodiments, the material blocking block 8 is internally provided with a hollow cavity, the hollow cavity can reduce the weight of the device, and the hollow cavity is filled with sound-absorbing material 13, which can be polyurethane sponge, rock wool or the like, so as to reduce the airflow noise.
[0021] The above embodiments can be combined with each other.
[0022] The above embodiments do not limit the shape, material, structure and the like of the utility model in any form, and any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the utility model are within the protection scope of the technical scheme of the utility model.
Claims
1. A pressure reducing device for a raw material pressure tank, characterized in that: The outer tube is uniformly provided with a plurality of exhaust holes with a smaller diameter than the outer diameter of the foam particles, both ends of the outer tube are provided with closed end covers, the inner tube is fixedly connected between the two closed end covers in the outer tube, the closed end cover at the front end of the outer tube is provided with a feeding port communicated with the inner tube, the closed end cover at the rear end of the outer tube is provided with a discharging port communicated with the inner tube, and an annular decompression cavity is formed between the inner side wall of the outer tube and the outer side wall of the inner tube. The inner tube is fixedly connected with a material blocking block in the middle, the inner tube is divided into a front cavity and a rear cavity by the material blocking block, a plurality of first material passing holes communicated with the annular decompression cavity are uniformly arranged on the side wall of the front cavity, a plurality of second material passing holes communicated with the annular decompression cavity are uniformly arranged on the side wall of the rear cavity, and the diameters of the first material passing holes and the second material passing holes are larger than the outer diameter of the foam particles.
2. A raw material pressure tank pressure reducing device according to claim 1, characterized by: The outer tube and the inner tube are coaxially arranged.
3. The raw material pressure tank pressure reducing device according to claim 1, characterized by: The closed end cover is conical.
4. The raw material pressure tank pressure reducing device according to claim 1, characterized by: Both ends of the material blocking block are conical.
5. The raw material pressure tank pressure reducing device according to claim 1, characterized by: The material blocking block is internally provided with a hollow cavity, and the hollow cavity is filled with sound-absorbing material.