Gas recovery device of low-pressure holding furnace
By designing a gas recovery device for low-pressure insulation furnace including a low-pressure insulation furnace body, air intake pipe, pressure vessel, supply pipeline and recycling pipeline, the problem of nitrogen in traditional low-pressure insulation furnace cannot be recovered and utilized is solved, and the nitrogen recovery and recycling is realized, and production costs are reduced.
Patent Information
- Application Number
- CN202421328423.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-06-12
AI Technical Summary
The lack of gas recovery devices in use in traditional low-pressure insulation furnaces, resulting in the inability to recycle the nitrogen used to replace compressed air, increasing production costs.
A low-pressure insulation furnace gas recovery device is designed, including a low-pressure insulation furnace body, air intake pipe, pressure vessel, supply pipeline and recovery pipeline. The nitrogen in the low-pressure insulation furnace is pumped into a pressure vessel for recycling through a pipeline pump, and the recovered nitrogen is sent back to the low-pressure insulation furnace for recycling when needed.
It realizes the recycling and utilization of nitrogen, reduces production costs, and the device is simple in structure, convenient in use and strong practicality.
Smart Images
Figure CN222651936U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas recovery devices, in particular to a gas recovery device for a low-pressure insulation furnace. Background Art
[0002] At present, low-pressure holding furnaces are often required in the low-pressure casting production process of aluminum alloy wheels. During the use of the low-pressure holding furnace, since the aluminum alloy liquid contains aluminum, magnesium, titanium, strontium and other active metals, in order to prevent the aluminum alloy liquid in the holding furnace from absorbing oxygen in the compressed air over time, thereby producing oxides such as aluminum oxide and magnesium oxide as well as titanium oxide and strontium oxide, which in turn leads to more and more hydrogen and oxide inclusions in the produced castings, our company uses dry inert gas, namely nitrogen, as a pressurizing medium instead of compressed air in the low-pressure casting process to avoid the generation of oxides and slag inclusions. However, the traditional low-pressure holding furnace lacks a gas recovery device during use, which results in the inability to recycle the nitrogen used by our company to replace compressed air in the production process, which leads to an increase in production costs. In order to ensure production quality and further save production costs, this application specifically proposes a gas recovery device for a low-pressure holding furnace. Utility Model Content
[0003] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a low-pressure insulation furnace gas recovery device, the technical solution to the problem is, including a low-pressure insulation furnace body, an air inlet pipe is installed in the low-pressure insulation furnace body, the outlet end of the air inlet pipe is fixedly connected to the inlet end of the dispersion pipe, characterized in that a pressure vessel is arranged outside the insulation furnace body, the internal pressure of the pressure vessel is 0.4-0.6MPa, an inert gas replenishment port is arranged at the upper end of the pressure vessel, a safety valve is installed at the upper end of the pressure vessel, the calibrated pressure of the safety valve is 0.8MPa, the pressure vessel The outlet end of the device is fixedly connected with the inlet end of the supply pipeline, the outlet end of the supply pipeline passes through the body of the low-temperature pressure holding furnace and is connected with the inlet end of the intake pipe, the inlet end of the supply pipeline is sequentially installed with a first manual gate valve and a first air pressure detector, the supply pipeline is also sequentially installed with a gas source pressure switch, an air intake valve and an insulation furnace air intake control valve island, a recovery pipeline is installed in the insulation furnace body, the outlet end of the recovery pipeline passes through the body of the low-pressure insulation furnace and is connected with the inlet end of the pressure vessel, and the recovery pipeline is sequentially installed with a second air pressure detector, a one-way valve, a pipeline pump and a second manual gate valve.
[0004] Preferably, an air intake hood is installed at the inlet end of the recovery pipeline.
[0005] The beneficial effects of the utility model are:
[0006] When the present application is in use, the pipeline pump provided can pump the nitrogen in the low-pressure insulation furnace body into the pressure vessel for recovery. When necessary, the nitrogen recovered in the pressure vessel can also be sent into the low-pressure insulation furnace body for recycling, thereby solving the problem that nitrogen cannot be recycled during the use of the traditional low-pressure insulation furnace body and saving production costs. The present application has a simple structure, is easy to use and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 It is a schematic diagram of the structure of the utility model.
[0008] Reference numerals
[0009] 1. Low-pressure holding furnace body, 2. Air inlet pipe, 3. Dispersion pipe, 4. Pressure vessel, 5. Inert gas replenishment port, 6. Safety valve, 7. Supply pipeline, 8. First manual gate valve, 9. First air pressure detector, 10. Air source pressure switch, 11. Air inlet valve, 12. Holding furnace air inlet control valve island, 13. Recovery pipeline, 14. Second air pressure detector, 15. Check valve, 16. Pipeline pump, 17. Second manual gate valve, 18. Air inlet hood. DETAILED DESCRIPTION
[0010] The following is combined with Figure 1 The specific implementation methods of the utility model are further described in detail.
[0011] Embodiment 1, the technical solution is that when the present application is in use, the pipeline pump 16 provided can pump the nitrogen in the low-pressure insulation furnace body 1 into the pressure vessel 4 for recovery, and when necessary, the nitrogen recovered in the pressure vessel 4 can also be sent to the low-pressure insulation furnace body 1 for recycling, thereby solving the problem that the nitrogen cannot be recycled during the use of the traditional low-pressure insulation furnace body 1, saving production costs. The present application has a simple structure, is easy to use, and is highly practical.
[0012] Embodiment 2, based on Embodiment 1, specifically, when the present application is in use, the air intake pipe 2 has two inlets, one of which is connected to the outlet end of the supply pipeline 7 as shown in the present application, so as to reuse the recovered nitrogen, and the other inlet is connected to an external nitrogen storage tank, so as to use nitrogen as a pressurized medium. Its specific structure can adopt the existing technology, and this application will not describe it.
[0013] In order to avoid waste of nitrogen, the present application arranges a recovery pipeline 13 in the low-pressure insulation furnace body 1, and starts the pipeline pump 16 when recovering nitrogen. The pipeline pump 16 should adopt a large-flow and high-temperature pipeline pump. The nitrogen in the low-pressure insulation furnace body 1 is pumped into the pressure vessel 4 through the pipeline pump 16. A one-way valve 15 is arranged on the recovery pipeline 13 to avoid nitrogen reflux. A second air pressure detector 14 is arranged on the recovery pipeline 13 near the low-pressure insulation furnace body 1. The second air pressure detector 14 can monitor the pressure in the low-pressure insulation furnace body 1 to ensure that the furnace pressure is normal.
[0014] The nitrogen recovered into the pressure vessel 4 through the recovery pipeline 13 can also be transported to the low-pressure insulation furnace body 1 again through the supply pipeline 7 for utilization. In order to ensure that the pressure of the reused nitrogen is appropriate, the internal pressure of the pressure vessel 4 should be stable at 0.4-0.6MPa, and the inlet end of the supply pipeline 7, that is, the outlet end of the pressure vessel 4, is successively installed with a first manual gate valve 8 and a first air pressure detector 9. The first air pressure detector 9 can monitor the internal pressure of the pressure vessel 4. When the internal pressure of the pressure vessel 4, that is, the pressure of the nitrogen, is lower than the set value, nitrogen should be supplemented through the inert gas replenishing port 5 to make its pressure reach the set value. When the internal pressure of the pressure vessel 4, that is, the pressure of the nitrogen, is higher than the set value, the safety valve 6 is calibrated to a pressure of 0.8MPa. When the internal pressure of the pressure vessel 4 is too high, the safety valve 6 can relieve the pressure of the pressure vessel 4 to maintain its pressure at the set value. When necessary, the nitrogen in the pressure vessel 4 can be transported to the air inlet pipe 2 through the supply pipeline 7, and then dispersed from the dispersion pipe 3 to the low-pressure insulation furnace body 1 as a pressurized medium. The supply pipeline 7 is also provided with a gas source pressure switch 10, an air inlet valve 11 and an insulation furnace air inlet control valve island 12. The gas source pressure switch 10 can detect the pressure of the nitrogen from the pressure vessel 4 to ensure that the pressure of the nitrogen entering the low-pressure insulation furnace is appropriate. The air inlet valve 11 and the valve island are convenient for controlling the on-off of the supply pipeline 7.
[0015] Embodiment 3, on the basis of embodiment 2, when the pressure vessel 4 needs to be overhauled, the on-off of the gas circuit can be controlled by the first manual gate valve 8 and the second manual gate valve 17, thereby facilitating the overhaul. The air inlet hood 18 is provided to facilitate the nitrogen to enter the recovery pipeline 13 for recovery.
Claims
1. A low-pressure holding furnace gas recovery device, comprising a low-pressure holding furnace body (1), an air inlet pipe (2) installed in the low-pressure holding furnace body (1), the outlet end of the air inlet pipe (2) being fixedly connected to the inlet end of a dispersion pipe (3), characterized in that: A pressure vessel (4) is arranged outside the insulation furnace body, the internal pressure of the pressure vessel (4) is 0.4-0.6 MPa, an inert gas replenishing port (5) is arranged at the upper end of the pressure vessel (4), a safety valve (6) is installed at the upper end of the pressure vessel (4), the rated pressure of the safety valve (6) is 0.8 MPa, the outlet end of the pressure vessel (4) is fixedly connected to the inlet end of a supply pipeline (7), the outlet end of the supply pipeline (7) passes through the low-temperature pressure-maintaining furnace body and is connected to the inlet end of the air inlet pipe (2), and the inlet end of the supply pipeline (7) is connected in sequence to the inlet end of the supply pipeline (7). A first manual gate valve (8) and a first air pressure detector (9) are installed, and an air source pressure switch (10), an air intake valve (11) and an air intake control valve island (12) of the insulation furnace are installed in sequence on the supply pipeline (7). A recovery pipeline (13) is installed in the insulation furnace body, and the outlet end of the recovery pipeline (13) passes through the outside of the low-pressure insulation furnace body (1) and is connected to the inlet end of the pressure container (4). A second air pressure detector (14), a one-way valve (15), a pipeline pump (16) and a second manual gate valve (17) are installed in sequence on the recovery pipeline (13).
2. A low-pressure holding furnace gas recovery device according to claim 1, characterized in that: An air intake hood (18) is installed at the inlet end of the recovery pipeline (13).