CN218817221U

CN218817221U - High-efficient feeding structure of pump case

Info

Publication number: CN218817221U
Application number: CN202223256025.7U
Authority: CN
Inventors: 吕崇伟; 王凯
Original assignee: Dongying Yicheng Precision Metal Co ltd
Current assignee: Dongying Yicheng Precision Metal Co ltd
Priority date: 2022-12-02
Filing date: 2022-12-02
Publication date: 2023-04-07
Anticipated expiration: 2032-12-02

Abstract

The utility model is suitable for an investment casting technical field, a high-efficient feeding structure of pump case lies in improving the structure of pump case structure wall, provides and improves the position and is in the round platform structure of inner chamber thermal junction one side of pump case, round platform structural department improves for optimizing the structure wall, optimize the structure wall with pump case integrated into one piece. Therefore, the utility model designs an external feeding structure, an inner cavity sprue is not needed, the quality hidden danger of each process is avoided fundamentally, the sprue can be directly polished and eliminated, the mechanical processing is not needed, and the material waste is avoided; the production efficiency is improved, and the production period is shortened.

Description

High-efficient feeding structure of pump case

Technical Field

The utility model relates to an investment casting technical field especially relates to a high-efficient feeding structure of pump case.

Background

A pump is a machine that delivers or pressurizes a fluid. It transfers the mechanical energy of the prime mover or other external energy to the liquid, causing the liquid energy to increase. The pump is mainly used for conveying liquid such as water, oil, acid-base liquid, emulsion, suspension emulsion and liquid metal, and can also be used for conveying liquid, gas mixture and liquid containing suspended solid. Pumps can be generally classified by their operating principle into three types, positive displacement pumps, dynamic pumps and other types of pumps.

The pump shell is used for collecting the liquid thrown out by the inner impeller and converting part of kinetic energy of the high-speed liquid into static pressure energy. The reason is that the shell is volute, the cross section of the flow passage is gradually increased, the speed is reduced, and the pressure is increased.

The high-precision pump shell is usually manufactured by adopting an investment casting process, wherein the investment casting process is also called lost wax casting and comprises the working procedures of wax pressing, wax trimming, tree assembling, shell manufacturing, dewaxing, roasting, pouring, post-treatment and the like. The lost wax casting is to use wax material to make the wax mould and pouring channel of the part to be cast, the wax mould and pouring channel are welded into the wax mould set of the whole casting system, the wax mould set is coated with refractory material layer by layer, each layer is naturally dried and solidified to finally make the shell with qualified strength, the made shell is melted and recovered by a steam dewaxing axe, the dewaxed shell is fully roasted at high temperature and then directly poured with the smelted qualified molten steel from a pouring cup, and the required part is made after the casting mould is solidified and cooled. Shrinkage of the casting occurs during the process of converting the liquid into the solid, and if the liquid is not replenished in time, shrinkage cavities are generated in the casting, so that the casting is scrapped. Therefore, the liquid is supplied to the casting to prevent shrinkage cavities before the casting is solidified, and such a portion for supplying the liquid to the casting is called a feeding system. It is generally used in the casting production of castings, and after the casting is solidified, it is cut off.

A hot junction structure exists in the inner cavity of the pump shell, and when the pump shell is cast by an investment mold, an inner sprue cannot be arranged on the outer structure of the pump shell for feeding. The existing investment casting pouring system scheme is that an inner sprue is arranged at the plane of an inner cavity hot spot position to feed the inner cavity hot spot.

The prior casting system scheme has the following defects:

the tree assembling process (the bonding and assembling of the wax mold pouring system) needs to bond the inner cavity sprue, a welding line is easy to exist at the bonding position of the sprue and limited by the space of the inner cavity, the welding line is not easy to check and is good in sealing, the gap defect of the wax mold can cause the permeation of shell making slurry, a sheet core is formed after the shell is made by the permeated slurry, the strength of the sheet core is lower, one part of the sheet core is discharged along with the wax or remains to be bonded on the inner wall of a cavity in the dewaxing process, and the other part of the sheet core still remains unchanged, in the pouring and filling process, the sheet core is broken and dissociated in molten steel under the impact of the molten steel, and the part which cannot float upwards is remained in a casting body to form the casting defect of 'sand inclusion', and the strength of the casting is reduced.

The shell making process is influenced by the inner cavity sprue, the coating and air drying performance is reduced, on one hand, the shell making air drying time is prolonged, and the production efficiency is reduced; on the other hand, the strength of the inner cavity shell is reduced, and the casting defect of 'fire running (molten steel leakage)' is easy to occur in the pouring and filling process, so that the casting is scrapped.

The pouring process, the runner solidifies fast in the atmosphere, and the cavity runner is subjected to the shell heat radiation effect and is solidified slowly, and the runner needs to adopt the mode of parcel rock wool to delay the cooling, makes the runner continuously supply the cavity runner, prevents that the cavity runner root from appearing "shrinkage porosity" defect.

The residual removal cost of the inner pouring gate is high, the efficiency is low, and the material waste is serious: after pouring is finished, the inner cavity sprue cannot be cut and removed through shell vibration, shot blasting and cutting (sprue and pouring gate are separated). The residual inner pouring gate needs to be machined and removed by a milling machine, the machining cost is high, the efficiency is low, the production period is long, the part of the inner pouring gate which is machined and removed is changed into steel scraps which cannot be melted for use, the steel scraps can only be treated according to waste materials, and the material waste is serious.

In conclusion, the prior art has low production efficiency of tree assembling, shell manufacturing and sprue removing; in the prior art, serious hidden quality troubles exist in tree assembling, shell manufacturing and pouring procedures; in the prior art, a pouring gate needs to be machined, the manufacturing cost is high, and the material waste is serious.

In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects, the utility model aims at providing a pump case high-efficiency feeding structure, which designs an external feeding structure, does not need an inner cavity sprue, avoids the quality hidden trouble of each process from the top, directly polishes and eliminates the sprue, does not need mechanical processing, and avoids material waste; the production efficiency is improved, and the production period is shortened.

In order to realize the above-mentioned purpose, the utility model provides a high-efficient feeding structure of pump case lies in the structure of improving pump case structure wall, the position at modified pump case structure wall place does the round platform structure of inner chamber thermal junction one side of pump case, round platform structural department improves for optimizing the structure wall, optimize the structure wall with pump case integrated into one piece, the improvement state that optimizes the structure wall than former structure wall lies in the thickening, widens, is convenient for carry out the feeding.

According to the utility model discloses a high-efficient feeding structure of pump case, it is 1.2 times of original structure wall cross-sectional thickness to optimize structure wall cross-sectional thickness.

According to the utility model discloses a high-efficient feeding structure of pump case, optimize structure wall left side with the inner chamber heat festival links to each other.

According to the utility model discloses a high-efficient feeding structure of pump case, at the feeding in-process, it sets up the outer wall runner to optimize structure wall upper end.

According to the utility model discloses a high-efficient feeding structure of pump case, optimize structure wall upper end and connect outer wall pouring device, after the feeding process, the outer wall runner of outer wall runner department remains and can easily realize root excision and correct grinding.

An object of the utility model is to provide a high-efficient feeding structure of pump case, through the structure at improvement pump case structure wall, improve round platform structure department for optimizing the structure wall, design outside feeding structure, need not the inner chamber runner, avoid each process quality hidden danger from the root, the runner directly can be polished and eradicated, need not machining, avoid the material extravagant. The utility model has the advantages that: the production efficiency is improved, the production period is shortened, and the production cost is saved.

Drawings

FIG. 1 is a schematic view of a pump housing assembly;

FIG. 2 is a schematic view of a pump casing original structure cavity gating system;

FIG. 3 is a schematic illustration of a residual sprue in the original pump housing structure;

fig. 4 is a schematic view of a first configuration of the pump housing of the present invention;

fig. 5 is a second structural schematic diagram of the pump casing of the present invention;

FIG. 6 is a schematic view of the outer wall gating system of the present invention;

fig. 7 is a schematic diagram of the outer wall gate residual of the present invention;

FIG. 8 is a schematic cross-sectional view of the pump housing precursor structure wall;

fig. 9 is a schematic cross-sectional view of the optimized structural wall of the present invention;

in the figure: 1-inner cavity thermal section, 2-original structure wall, 3-inner cavity pouring device, 4-inner cavity pouring gate residue, 5-optimized structure wall, 6-outer wall pouring device and 7-outer wall pouring gate residue.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, fig. 4 and fig. 5, the utility model provides a high-efficient feeding structure of pump case lies in improving the structure of pump case structure wall, and the position at modified pump case structure wall place is the round platform structure of 1 one side of the inner chamber heat festival of pump case, and round platform structure department improves for optimizing structure wall 5, optimizes structure wall 5 and pump case integrated into one piece, and the improvement state that optimizes structure wall 5 than original structure wall 2 lies in the thickening, widens, is convenient for carry out the feeding.

Referring to fig. 8 and 9, the optimized structural wall 5 has a cross-sectional thickness 1.2 times the cross-sectional thickness of the original structural wall 2; the left side of the optimized structure wall 5 is connected with the inner cavity thermal joint 1.

Referring to fig. 2 and 3, in the prior art, a feeding system of a pump shell is provided with an inner cavity pouring device 3, pouring liquid is poured from the inner end of the pump shell for feeding, and after the feeding is finished, the cutting and fine grinding of the residual inner cavity sprue 4 are time-consuming and labor-consuming.

Referring to fig. 6 and 7, during feeding, the upper end of the optimized structural wall 5 is provided with an outer wall sprue. The upper end of the optimized structure wall 5 is connected with an outer wall pouring device 6, and after the feeding process is finished, the outer wall pouring gate residue 7 at the outer wall pouring gate can easily realize root cutting and fine grinding.

The following table is the cost and efficiency comparison of the prior art and the utility model.

To sum up, the utility model discloses a structure at improvement pump case structure wall improves the round platform structure department for optimizing the structure wall, designs outside feeding structure, need not the inner chamber runner, avoids each process quality hidden danger from the root, and the runner directly can be polished and eradicated, need not machining, avoids the material extravagant. The utility model has the advantages that: the production efficiency is improved, the production period is shortened, and the production cost is saved.

Naturally, the present invention can be embodied in many other forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be made by one skilled in the art without departing from the spirit or essential attributes thereof, and it is intended that all such changes and modifications be considered as within the scope of the appended claims.

Claims

1. The efficient feeding structure of the pump shell is characterized in that the position of the improved pump shell structure wall is a circular truncated cone structure on one side of an inner cavity hot junction of the pump shell, the circular truncated cone structure is improved into an optimized structure wall, and the optimized structure wall and the pump shell are integrally formed.

2. A pump casing high efficiency feeding structure in accordance with claim 1, wherein said optimized structure wall cross sectional thickness is 1.2 times the original structure wall cross sectional thickness.

3. The pump casing high efficiency feeding structure of claim 2, wherein said optimized structure wall left side is connected to said inner cavity thermal junction.

4. A pump casing high efficiency feeding structure in accordance with claim 1, wherein said optimized structure wall upper end is provided with an outer wall sprue during feeding.

5. The pump casing high efficiency feeding structure according to claim 4, wherein the upper end of the wall of the optimized structure is connected with an outer wall casting device.