CN213794083U

CN213794083U - Double-runner turbocharger shell combined sand core exhaust system

Info

Publication number: CN213794083U
Application number: CN202022435433.3U
Authority: CN
Inventors: 田中青; 田政; 田龙; 代浩; 陈敏
Original assignee: Xixia Zhongde Automobile Parts Co ltd
Current assignee: Xixia Zhongde Automobile Parts Co ltd
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2021-07-27
Anticipated expiration: 2030-10-28

Abstract

The invention belongs to the field of casting of automobile turbocharger shells, and particularly relates to a double-flow-passage turbocharger shell combined sand core exhaust system. The invention provides a double-runner turbocharger shell combined sand core exhaust system, which strengthens the exhaust capacity of a sand core wrapped by molten iron in the pouring process by arranging and communicating exhaust channels in the sand core, designs an exhaust channel for an inner runner sand core, directly exhausts gas generated by the inner runner sand core in the pouring process out of a mold through the channel, and can effectively solve the casting defect caused by untimely exhaust of the gas generated by the inner runner sand core.

Description

Double-runner turbocharger shell combined sand core exhaust system

Technical Field

The invention belongs to the field of casting of automobile turbocharger shells, and particularly relates to a double-flow-passage turbocharger shell combined sand core exhaust system.

Background

In the casting and pouring process, the sand core can generate a large amount of gas within a few seconds under the action of high-temperature molten iron, and if the gas cannot be discharged outside a mold in time, the gas can be left on a casting to cause the casting to generate gas hole defects, so that the design of a sand mold exhaust passage is very critical. In the existing exhaust design, gas generated in the casting process of molding sand forming the appearance of a casting is mainly exhausted through a parting surface, an overflow riser and the air permeability of a sand mold, but the gas generated in the casting process of an inner runner sand core forming the internal shape of the casting needs to be firstly exhausted into a cavity through molten iron and then exhausted out of the casting through gas exhaust channels in the cavity such as the parting surface, the overflow riser and the like, if local molten iron is cooled too fast in the casting process, the gas generated in an inner runner is left on the casting to generate a gas hole defect, therefore, an exhaust channel is designed for the inner runner sand core, the gas generated in the casting process of the inner runner sand core is directly exhausted out of the casting through the channel, and the casting defect caused by the fact that the gas generated in the inner runner sand core is not exhausted in time can be effectively solved.

Disclosure of Invention

Aiming at the problems, the invention provides a combined sand core exhaust system of a double-flow-passage turbocharger shell, which strengthens the exhaust capacity of the sand core wrapped by molten iron in the casting process through the design of the sand core.

The invention provides a technical scheme for realizing the aim, which is to design a double-flow-passage turbocharger shell combined sand core exhaust system, comprising: the air chamber sand core, the first runner sand core and the second runner sand core are sequentially combined together; the center of the air chamber sand core is axially provided with a first exhaust channel, the center of the first runner sand core is axially provided with a second exhaust channel, the center of the second runner sand core is axially provided with a third exhaust channel, the first exhaust channel, the second exhaust channel and the third exhaust channel are positioned on an axis and sequentially communicated, and the first exhaust channel and the third exhaust channel are communicated with the atmosphere; a fourth exhaust channel is radially arranged in the first flow channel sand core, is vertical to and communicated with the second exhaust channel, a fifth exhaust channel is radially arranged in the second flow channel sand core, and is vertical to and communicated with the third exhaust channel; a clearance gap is reserved on the contact surface of the first runner sand core and the second runner sand core, and the clearance gap is communicated with the fourth exhaust channel; and the first runner sand core and the second runner sand core form a sealing area at the position where the first runner sand core and the second runner sand core are contacted with molten iron.

Further, the cross section of the clearance gap is annular.

Further, the number of the fourth exhaust passages is 1-3.

Further, the number of the fifth exhaust passages is 1-3.

When the sand core is used, the first runner sand core is completely wrapped by molten iron and cannot exhaust, and is positioned on the air chamber sand core and the second runner sand core and suspended in the cavity; the air chamber sand core and the second runner sand core are partially contacted with molten iron, the outer parts of the air chamber sand core and the second runner sand core are positioned in a sand mold and can be contacted with the atmosphere, and air can be exhausted through the first exhaust channel and the third exhaust channel; the first exhaust channel, the second exhaust channel and the third exhaust channel are arranged on the same axis and are communicated with each other, wherein the first exhaust channel and the third exhaust channel are in contact with the atmosphere; the fourth exhaust channel and the fifth exhaust channel are respectively arranged on the first runner sand core and the second runner sand core and are vertical to the second exhaust channel and the third exhaust channel; the clearance is used for heating and generating gas in the sand core during the pouring process, and the gas is discharged out of the mold through the clearance and the exhaust channel, so that the first runner sand core has good exhaust capacity, and the defect of casting pores is reduced. In conclusion, the invention provides a double-runner turbocharger shell combined sand core exhaust system, the exhaust capacity of a sand core wrapped by molten iron in the pouring process is enhanced through the arrangement and the penetration of exhaust channels in the sand core, the exhaust channel is designed for the inner runner sand core, gas generated by the inner runner sand core in the pouring process is directly exhausted out of a mold through the channel, and the casting defect caused by the fact that the gas generated by the inner runner sand core is exhausted out of time can be effectively solved.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the invention.

Detailed Description

Referring to fig. 1, a dual-flow passage turbocharger housing combined sand core exhaust system comprises: the air chamber sand core 1, the first runner sand core 2 and the second runner sand core 3 are sequentially combined together; the center of the air chamber sand core 1 is axially provided with a first exhaust channel 4, the center of the first runner sand core 2 is axially provided with a second exhaust channel 5, the center of the second runner sand core 3 is axially provided with a third exhaust channel 6, the first, second and

third exhaust channels

4, 5 and 6 are positioned on an axis and sequentially communicated, and the first exhaust channel 4 and the third exhaust channel 6 are communicated with the atmosphere; a fourth exhaust channel 7 is radially arranged in the first runner sand core 2, the fourth exhaust channel 7 is perpendicular to and communicated with the second exhaust channel 5, a fifth exhaust channel 8 is radially arranged in the second runner sand core 3, and the fifth exhaust channel 8 is perpendicular to and communicated with the third exhaust channel 6; a clearance gap 9 is reserved on the contact surface of the first runner sand core 2 and the second runner sand core 3, and the clearance gap 9 is communicated with the fourth exhaust channel 7; the first and second

runner sand cores

2 and 3 form a sealing region 10 at a position where they contact molten iron. The sealing area 10 is formed by tightly combining the contact surfaces of the first runner sand core 2 and the second runner sand core 3 after combination, the contact surfaces are only provided with 1-2mm gaps after being attached, and molten iron is rapidly solidified at the contact surfaces and cannot continuously enter the clearance gap 9, so that the sealing area 10 is formed; the clearance 9 is formed by the combination of the first runner sand core 2 and the second runner sand core 3 and the mutual approach of the surfaces. The cross section of the clearance gap 9 is annular; the number of the fourth exhaust channels is 1-3, preferably 1; the number of the fifth exhaust passages is 1 to 3, preferably 1.

Claims

1. A dual-flow-passage turbocharger housing combined sand core exhaust system comprises: the air chamber sand core, the first runner sand core and the second runner sand core are sequentially combined together; the method is characterized in that: the center of the air chamber sand core is axially provided with a first exhaust channel, the center of the first runner sand core is axially provided with a second exhaust channel, the center of the second runner sand core is axially provided with a third exhaust channel, the first exhaust channel, the second exhaust channel and the third exhaust channel are positioned on an axis and sequentially communicated, and the first exhaust channel and the third exhaust channel are communicated with the atmosphere; a fourth exhaust channel is radially arranged in the first flow channel sand core, is vertical to and communicated with the second exhaust channel, a fifth exhaust channel is radially arranged in the second flow channel sand core, and is vertical to and communicated with the third exhaust channel; a clearance gap is reserved on the contact surface of the first runner sand core and the second runner sand core, and the clearance gap is communicated with the fourth exhaust channel; and the first runner sand core and the second runner sand core form a sealing area at the position where the first runner sand core and the second runner sand core are contacted with molten iron.

2. The combined sand core exhaust system of the double-channel turbocharger shell as claimed in claim 1, wherein: the cross section of the clearance gap is annular.

3. The combined sand core exhaust system of the double-channel turbocharger shell as claimed in claim 1, wherein: the number of the fourth exhaust passages is 1-3.

4. The combined sand core exhaust system of the double-channel turbocharger shell as claimed in claim 1, wherein: the number of the fifth exhaust passages is 1-3.