CN210848203U

CN210848203U - Balancing piece wax matrix

Info

Publication number: CN210848203U
Application number: CN201921618649.4U
Authority: CN
Inventors: 贾平凡; 郝朝阳; 王光禹; 严林
Original assignee: Zhaoqing Pisitong Machinery Co ltd
Current assignee: Zhaoqing Pisitong Machinery Co ltd
Priority date: 2019-09-26
Filing date: 2019-09-26
Publication date: 2020-06-26
Anticipated expiration: 2029-09-26

Abstract

The utility model belongs to the technical field of metal casting, a balancing piece wax matrix is disclosed, including annular wax matrix body, be equipped with first rivet hole and second rivet hole on the wax matrix body, the length of first rivet hole is longer than the length of second rivet hole, be equipped with the boss on the wax matrix body, first rivet hole runs through in boss and the wax matrix body; and a sand core is filled in the first rivet hole. The sand core is additionally arranged in the long rivet hole before the shell is manufactured, so that the problems of slurry hanging and sand hanging in the ultra-long rivet hole in the traditional scheme can be solved.

Description

Balancing piece wax matrix

Technical Field

The utility model belongs to the technical field of the metal casting technique and specifically relates to a balancing piece wax matrix.

Background

The compressor is the heart of the refrigeration system, and the balance block is a key part for keeping dynamic balance when the rotor of the motor of the compressor rotates at high speed. When the refrigeration compressor works, the rotor drives the eccentric crankshaft to rotate, and the rotating crankshaft drives the piston sleeved on the eccentric part of the eccentric crankshaft to compress low-temperature and low-pressure refrigerant gas, so that the high-temperature and high-pressure refrigerant gas is discharged to the exhaust pipe, and the refrigeration cycle of compression → condensation → expansion → evaporation (heat absorption) is realized. In the process of the refrigeration cycle, the eccentric rotation of the piston causes unbalanced stress on the whole system, and vibration and noise are easy to generate. In order to balance the stress condition of the compressor, a mode of adding a balance block at the rotor end is adopted, so that the whole system keeps stress balance. The function and purpose of the balance block are to offset the unbalanced stress generated by the eccentric rotation movement to a certain extent, so that the system is kept balanced, and the purposes of reducing noise, vibration and energy consumption are achieved.

Important product characteristics of the weight are non-magnetism and high quality tightness. With the continuous research, development and application of compressors with new technical characteristics of silence, frequency conversion, dual cores and the like, parts are more and more diversified as balance blocks of core parts of the compressors. At present, the structure of the overlong rivet hole appears in the appearance form, the size of a product is bad and high in the product manufacturing process due to product shrinkage, and meanwhile, the difficulty in the manufacturing process is caused by the fact that iron clamping and bulging easily appear in the overlong rivet hole. Therefore, the manufacturing of the overlong rivet hole balance block is broken through in the process, and the problem to be solved at present is solved.

Tracing back from the product process (product → cleaning → shelling → pouring → shell mold baking → dewaxing → making shell → assembling tree → shooting wax → mold making → mold design), through the analysis of the whole process, the problem is exposed to the shelling stage. Further research shows that the physical properties of the membrane shell, such as pressure, do not have large fluctuation, which indicates that the membrane shell has no problems in the components. And through further investigation, slurry hanging and sand hanging conditions at the position of the overlong rivet hole are found to cause difficulty in slurry hanging and sand hanging due to the deep position of the hole. Through the investigation and analysis based on the product manufacturing process, the manufacturing process bottleneck of the overlong rivet hole balance block product is determined to be the problems of slurry hanging and sand hanging at the deep hole position.

Therefore, the technical problem to be solved by the present application is: how to reform the wax mould generated between the wax injection step and the shell making step so as to improve the product percent of pass and solve the problems of iron inclusion and slurry coating.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a balancing piece wax matrix, this wax matrix add in the long rivet is downthehole before making the shell and establish the psammitolite, can solve the problem of hanging thick liquid, hanging sand in the overlength rivet hole among the traditional scheme.

The technical scheme of the application is as follows:

a balance block wax mould comprises an annular wax mould body, wherein a first rivet hole and a second rivet hole are formed in the wax mould body, the length of the first rivet hole is longer than that of the second rivet hole, a boss is arranged on the wax mould body, and the first rivet hole penetrates through the boss and the wax mould body; and a sand core is filled in the first rivet hole.

In the balance weight wax mould, the sand core is a ceramic sand core.

In the balance weight wax mould, the depth of the second rivet hole is 2.5 mm; the diameter of the second rivet hole is 4.41-4.64 mm.

In the balance weight wax mould, the depth of the first rivet hole is 15.65 mm; the diameter of the first rivet hole is 4.62-4.65 mm.

In the balance weight wax mould, 4 second rivet holes which are uniformly arranged are formed in the wax mould body and are positioned outside the boss; the first rivet hole is 2 and arranges on the boss.

In the balance weight wax mould, the boss and the wax mould body are integrally formed by wax injection molding.

In the balance weight wax mould, the projection of the end part of the boss on the horizontal plane is a fillet.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model discloses on the basis of traditional wax matrix, add in the long rivet hole of wax matrix before carrying out the system shell and establish the psammitolite, can solve the problem that the downthehole thick liquid of hanging of overlength rivet, string sand in the traditional scheme.

The wax mould that contains the psammitolite carries out the system shell, can avoid system shell in-process, and the problem that the intussuseption is not good in the overlength rivet hole, and then solves above-mentioned technical problem.

Drawings

Fig. 1 is a plan view of embodiment 1 of the present invention.

Fig. 2 is a sectional view taken along line a-a of embodiment 1 of the present invention;

fig. 3 is a rear view of embodiment 1 of the present invention.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the following detailed description, but the present invention is not limited thereto.

Example 1

As shown in fig. 1-3, a balance weight wax mold comprises an annular wax mold body 1, wherein a first rivet hole 2 and a second rivet hole 3 are arranged on the wax mold body 1, the length of the first rivet hole 2 is longer than that of the second rivet hole 3, a boss 4 is arranged on the wax mold body 1, and the first rivet hole 2 penetrates through the boss 4 and the wax mold body 1; and a sand core 5 is filled in the first rivet hole 2.

The wax pattern of this embodiment is mainly used for the formwork preparation of pouring. In the conventional process, a wax pattern is manufactured according to the shape of a product, but after the conventional sand core is used for manufacturing a shell and pouring molten steel to prepare a balance block, the qualification rate is only 8%. Wherein the occurrence rate of the phenomenon of iron inclusion is 58%; the bulge phenomenon was 31%; the other fail cases were 3%.

However, after a pre-designed sand core matched with the first rivet hole 2 is added into the overlong rivet hole (namely the first rivet hole 2) of the traditional wax mould, the qualified rate of the balance block reaches 96%.

Preferably, the sand core 5 is a ceramic sand core. The ceramic sand core has smooth surface and can resist high temperature, and is a preferred material for the sand core of the embodiment.

In practical application, the depth of the second rivet hole 3 is 2.5 mm; the diameter of the second rivet hole 3 is 4.41-4.64mm, and the depth of the first rivet hole 2 is 15.65 mm; the diameter of the first rivet hole 2 is 4.62-4.65 mm.

The wax mould of the embodiment is similar to the balance block product in specification, so 4 second rivet holes 3 which are uniformly arranged are arranged outside the boss 4 on the wax mould body 1; the number of the first rivet holes 2 is 2, and the first rivet holes 2 and the second rivet holes 3 are arranged on the boss 4, namely, the number and the positions of the first rivet holes 2 and the second rivet holes 3 correspond to those of an actual product; the boss 4 and the wax mould body 1 are formed by integral wax injection molding, and the projection of the end part B of the boss 4 on the horizontal plane is a fillet.

The above description is only for the preferred embodiment of the present invention, and all modifications, equivalents, improvements and the like that are made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A balance block wax mould comprises an annular wax mould body and is characterized in that a first rivet hole and a second rivet hole are formed in the wax mould body, the length of the first rivet hole is longer than that of the second rivet hole, a boss is arranged on the wax mould body, and the first rivet hole penetrates through the boss and the wax mould body; and a sand core is filled in the first rivet hole.

2. The weight block wax pattern of claim 1, wherein the sand core is a ceramic sand core.

3. The weight block wax pattern of claim 1, wherein the second rivet hole has a depth of 2.5 mm; the diameter of the second rivet hole is 4.41-4.64 mm.

4. The weight block wax pattern of claim 1, wherein the first rivet hole has a depth of 15.65 mm; the diameter of the first rivet hole is 4.62-4.65 mm.

5. The balance weight wax mold according to any one of claims 1 to 4, wherein the wax mold body is provided with 4 second rivet holes which are uniformly arranged and are positioned outside the boss; the first rivet hole is 2 and arranges on the boss.

6. The weight wax pattern of claim 5, wherein the boss and the wax pattern body are integrally formed by wax injection molding.

7. The weight block wax pattern of claim 6, wherein a projection of the end of the boss in a horizontal plane is rounded.