Negative pressure exhaust pipe for casting

Abstract

The utility model discloses a negative pressure exhaust pipe for casting in the technical field of casting. The negative pressure exhaust pipe comprises an air outlet pipe. A sealing end cover is hermetically fixed at one end of the air outlet pipe. An air inlet pipe and an air exhaust pipe which are arranged side by side penetrate through the sealing end cover, and the tail ends of the air inlet pipe and the air exhaust pipe extend into the air outlet pipe. The length of the air inlet pipe inserted into the air outlet pipe is larger than that of the exhaust pipe inserted into the air outlet pipe. The air inlet pipe and the exhaust pipe are identical in outer diameter, and the inner diameter of the air outlet pipe is 2-2.5 times of the outer diameter of the exhaust pipe. Negative pressure can be formed at one end of the exhaust pipe, and sand core gas is helped to be exhausted more quickly; the air outlet pipe is not easy to block, and the manual dredging frequency is greatly reduced, so that the workload of personnel is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of casting technology, and in particular to a negative pressure exhaust pipe for casting. Background Technology

[0002] In low-pressure casting molds, negative pressure needs to be applied to the sand core to ensure that gases generated during casting can be smoothly expelled. However, existing casting negative pressure extraction pipes have an unreasonable structure and are prone to blockage during extraction, requiring frequent manual unblocking. This not only increases workload but may also lead to a decrease in production efficiency. Therefore, there is an urgent need to design a casting negative pressure extraction pipe to solve these problems to some extent. Utility Model Content

[0003] The main objective of this invention is to provide a negative pressure extraction pipe for casting, which solves the problems mentioned in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A negative pressure exhaust pipe for casting includes an exhaust pipe. A sealing end cap is fixedly attached to one end of the exhaust pipe. An inlet pipe and an exhaust pipe are arranged side-by-side through the sealing end cap, and the ends of both the inlet pipe and the exhaust pipe extend into the exhaust pipe. The length of the inlet pipe inserted into the exhaust pipe is greater than the length of the exhaust pipe inserted into the exhaust pipe.

[0006] Furthermore, the outer diameter of the air inlet pipe is the same as that of the air extraction pipe, and the inner diameter of the air outlet pipe is 2 to 2.5 times the outer diameter of the air extraction pipe.

[0007] Furthermore, the sealing end cap and the exhaust pipe are sealed together by welding, and the intake pipe and the extraction pipe are fixedly connected to the sealing end cap by welding to form an airtight seal.

[0008] Furthermore, the exhaust pipe, intake pipe, extraction pipe, and sealing end cap are all made of high-temperature resistant steel.

[0009] This invention also includes other components that enable the negative pressure extraction pipe for casting to function properly, and these devices or components all employ conventional techniques in the art. Furthermore, any devices and components not specified in this invention employ conventional techniques in the art. In specific implementation, appropriate equipment or component models can be selected according to the specific working scenario.

[0010] The working principle of this invention is as follows: the suction pipe is inserted into the sand core of the mold, the air inlet pipe is connected to an air source for ventilation, and the gas is discharged from the exhaust pipe. A negative pressure is formed at one end of the suction pipe, which helps the gas in the sand core to be discharged smoothly during the casting process. In addition, the inner diameter of the exhaust pipe is 2 to 2.5 times the outer diameter of the suction pipe. The thickened exhaust pipe is less prone to clogging during operation, greatly reducing the frequency of manual unclogging, thereby reducing the workload of personnel and improving production efficiency.

[0011] Compared with the prior art, the present invention has the following advantages: a negative pressure is formed at one end of the suction pipe, which helps the gas in the sand core to be discharged more quickly; the exhaust pipe is not easy to be blocked, which greatly reduces the frequency of manual unblocking, thereby reducing the workload of personnel and improving production efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This is a cross-sectional view of the present invention.

[0014] In the diagram: 1. Air outlet pipe; 2. Sealing end cap; 3. Air inlet pipe; 4. Air extraction pipe. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Example:

[0017] like Figures 1-2 As shown, a negative pressure exhaust pipe for casting includes an exhaust pipe 1. A sealing end cap 2 is fixedly sealed at one end of the exhaust pipe 1. An inlet pipe 3 and an exhaust pipe 4 are arranged side-by-side through the sealing end cap 2, and the ends of both the inlet pipe 3 and the exhaust pipe 4 extend into the exhaust pipe 1. The length of the inlet pipe 3 inserted into the exhaust pipe 1 is greater than the length of the exhaust pipe 4 inserted into the exhaust pipe 1.

[0018] Specifically, the outer diameters of the inlet pipe 3 and the extraction pipe 4 are the same, and the inner diameter of the outlet pipe 1 is 2.3 times the outer diameter of the extraction pipe 4. The outlet pipe 1, inlet pipe 3, extraction pipe 4, and sealing end cap 2 are all made of high-temperature resistant steel, with the grade ZG35Cr24Ni7SiN. The sealing end cap 2 is sealed to the outlet pipe 1 by welding, and the inlet pipe 3 and extraction pipe 4 are fixedly and airtightly connected to the sealing end cap 2 by welding.

[0019] The working principle of this invention, a negative pressure exhaust pipe for casting, is as follows: the exhaust pipe 4 is inserted into the sand core of the mold, the air inlet pipe 3 is connected to an air source for ventilation, and the gas is discharged from the exhaust pipe 1. A negative pressure is formed at one end of the exhaust pipe 4, which helps the gas in the sand core to be discharged smoothly during the casting process. In addition, the inner diameter of the exhaust pipe 1 is 2.3 times the outer diameter of the exhaust pipe 4. The thickened exhaust pipe 1 is less prone to blockage during operation, greatly reducing the frequency of manual unblocking, thereby reducing the workload of personnel and improving production efficiency.

[0020] The above embodiments are merely descriptions of preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope of the present utility model.

Claims

1. A negative pressure exhaust pipe for casting, comprising an exhaust pipe (1), characterized in that: One end of the air outlet pipe (1) is sealed with a sealing end cap (2); an air inlet pipe (3) and an air extraction pipe (4) are arranged side by side on the sealing end cap (2), and the ends of the air inlet pipe (3) and the air extraction pipe (4) extend into the air outlet pipe (1); the length of the air inlet pipe (3) inserted into the air outlet pipe (1) is greater than the length of the air extraction pipe (4) inserted into the air outlet pipe (1).

2. The negative pressure extraction pipe for casting according to claim 1, characterized in that: The outer diameter of the air inlet pipe (3) is the same as that of the air extraction pipe (4), and the inner diameter of the air outlet pipe (1) is 2 to 2.5 times the outer diameter of the air extraction pipe (4).

3. The negative pressure extraction pipe for casting according to claim 1 or 2, characterized in that: The sealing end cap (2) is sealed to the air outlet pipe (1) by welding, and the air inlet pipe (3) and the air extraction pipe (4) are fixedly connected to the sealing end cap (2) by welding to form an airtight connection.

4. The negative pressure extraction pipe for casting according to claim 3, characterized in that: The exhaust pipe (1), intake pipe (3), extraction pipe (4) and sealing end cap (2) are all made of high-temperature resistant steel.

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