Nitrogen-filling and oxygen-expelling device for metal powder transfer

Abstract

The utility model relates to metal powder transfer technical field discloses a kind of nitrogen filling oxygen removal devices for metal powder transfer, comprising: first gas holder and compressor, the first gas holder gas outlet one end is connected with pressure sensor and flow sensor, the flow sensor gas outlet one end is connected with compressor, the compressor gas outlet one end is equipped with supercharging cylinder, the supercharging cylinder gas outlet one end is connected with second gas holder, the utility model is passed through two-stage gas holder, the combination design of second gas holder, third gas holder and supercharging cylinder, eliminate interference factors such as gas source fluctuation, compressor pulse;The flow sensor of third gas holder outlet is linked with valve, according to powder characteristic accurate control nitrogen flow rate, ensure that powder gap adsorbed oxygen is replaced fully.

Description

Technical Field

[0001] This utility model relates to the field of metal powder transfer technology, specifically a metal powder transfer device using nitrogen filling and oxygen removal. Background Technology

[0002] Metal powders are groups of metal particles smaller than 1 mm in size, such as iron powder, copper powder, and alloy powders. Reactive metal powders, such as titanium, aluminum, and magnesium, readily react with oxygen in the air, leading to a decrease in performance. Inert gas is introduced during transport to form a protective layer, isolating the powder from oxygen.

[0003] A Chinese patent (CN212682434U) discloses a nitrogen protection device for the casting process of water-atomized metal powder. The device includes a U-shaped tundish with an open top and a sealing cap. A cavity is located inside the sealing cap, with a feed pipe connected to the center of the top of the cavity. A feed valve is installed on the feed pipe. The bottom of the cavity extends to the bottom surface of the sealing cap and is open. A vacuum tube is connected to one side of the cavity, with a vacuum pump connected to its tail end. A nitrogen delivery pipe is connected to the other side of the cavity, with a nitrogen tank connected to its tail end. Several vertically arranged baffles are distributed on the inner wall of the tundish. A guide pipe is connected to the bottom of the tundish, with a leak nozzle fixedly connected to its bottom end. This patent effectively reduces gold erosion, extends the service life of the tundish, and allows for vacuuming and filling the tundish with nitrogen, ensuring a pure nitrogen environment during gold molten metal casting, preventing oxidation and guaranteeing product quality.

[0004] Existing nitrogen-filling and oxygen-removing devices for metal powder transfer often involve filling the metal powder transfer container with nitrogen from a gas storage tank. This filling method is prone to pressure instability, making it difficult to completely replace the oxygen adsorbed on the powder surface. Once the nitrogen filling is completed, nitrogen backflow is also likely to occur. Utility Model Content

[0005] The purpose of this invention is to provide a nitrogen-filling and oxygen-removing device for metal powder transfer, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a nitrogen-filling and oxygen-removing device for metal powder transfer, comprising: a first gas storage tank and a compressor, a pressure sensor and a flow sensor connected to one end of the outlet of the first gas storage tank, a compressor connected to one end of the outlet of the flow sensor, a booster cylinder provided at one end of the outlet of the compressor, a second gas storage tank connected to one end of the outlet of the booster cylinder, a third gas storage tank connected to one end of the outlet of the second gas storage tank, and a valve provided at one end of the outlet of the third gas storage tank.

[0007] Furthermore, one end of the air inlet of the first gas storage tank is used to connect to the nitrogen source on the outer wall, and a valve is provided between the external nitrogen source and the air inlet pipe of the first gas storage tank.

[0008] Furthermore, the pressure sensor is used to monitor the nitrogen pressure output from the first gas storage tank, and the flow sensor is used to monitor the nitrogen flow rate.

[0009] Furthermore, the compressor inlet is connected to one end of the flow sensor via a pipe, and check valves for guiding nitrogen flow are installed on both the compressor inlet and outlet pipes.

[0010] Furthermore, a pressure sensor is also installed on the connecting pipe between the booster cylinder and the second air tank.

[0011] Furthermore, the second gas storage tank is used for storing pressurized nitrogen, and a valve is provided between the second and third gas storage tanks.

[0012] Furthermore, the outlet pipe of the third gas tank is used to connect to the storage container for the metal powder, and a pressure sensor and a flow sensor are also installed on the outlet pipe of the third gas tank.

[0013] Furthermore, valves and pressure sensors are also installed on the inlet and outlet pipes of the booster cylinder.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This device employs a multi-stage pressure buffer system, connecting the first gas storage tank to the compressor, then to the booster cylinder, finally to the second and third gas storage tanks. The combined design of the two-stage gas storage tanks and the booster cylinder eliminates interference from gas source fluctuations and compressor pulses. A flow sensor and valve at the outlet of the third gas storage tank precisely control the nitrogen flow rate based on powder characteristics, ensuring sufficient replacement of oxygen adsorbed in the powder gaps. Check valves / valve combinations at the compressor inlet and outlet, and the booster cylinder inlet and outlet, form multiple backflow prevention barriers, completely blocking the nitrogen backflow path and preventing air or impurities from causing oxygen concentration rebound.

[0016] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0017] Figure 1 This is a perspective view of a nitrogen-filling and oxygen-removing device for metal powder transfer according to this utility model;

[0018] Figure 2 This is a perspective view of a nitrogen-filling and oxygen-removing device for metal powder transfer according to this utility model.

[0019] Figure 3This is a front view of a nitrogen-filling and oxygen-removing device for metal powder transfer according to this utility model;

[0020] Figure 4 This is a top view of a nitrogen-filling and oxygen-removing device for metal powder transfer according to this utility model.

[0021] In the diagram: 1. First gas storage tank; 2. Second gas storage tank; 3. Third gas storage tank; 4. Pressure sensor; 5. Flow sensor; 6. Compressor; 7. Booster cylinder. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please see Figures 1-4 This utility model provides a technical solution: a nitrogen filling and oxygen removal device for metal powder conversion, comprising: a first gas storage tank 1 and a compressor 6. One end of the gas outlet of the first gas storage tank 1 is connected to a pressure sensor 4 and a flow sensor 5. The pressure sensor 4 monitors the nitrogen pressure output by the first gas storage tank 1 in real time, and the flow sensor 5 monitors the nitrogen flow rate simultaneously. The data from both provide a basis for the dynamic adjustment of the compressor 6, ensuring that the nitrogen parameters entering the compressor 6 are stable, avoiding abnormal output of the compressor 6 due to initial pressure / flow fluctuations, and reducing the risk of pressure instability from the source.

[0024] One end of the flow sensor's outlet is connected to compressor 6, and the inlet of compressor 6 is connected to one end of flow sensor 5 via a pipe. Check valves for preventing nitrogen flow are installed on both the inlet and outlet pipes of compressor 6. The check valves at the inlet and outlet of compressor 6 form a one-way flow path. When compressor 6 stops or the pressure in the subsequent pipeline is higher than the output pressure of compressor 6, the reverse flow of nitrogen to compressor 6 or the first gas storage tank 1 can be completely blocked, preventing the return gas from mixing with air or impurities and solving the oxygen concentration rebound problem caused by backflow in traditional devices.

[0025] A booster cylinder 7 is installed at one end of the compressor 6's outlet. The outlet of the booster cylinder 7 is connected to a second gas storage tank 2. The booster cylinder 7 provides secondary pressurization to the nitrogen output from the compressor 6. Combined with the buffer storage function of the second gas storage tank 2, this ensures a stable output of high-pressure nitrogen, meeting the charging pressure requirements of highly reactive metal powders. Simultaneously, the volume adjustment of the gas storage tank 2 eliminates pressure pulses, further reducing pressure fluctuations. A third gas storage tank 3 is connected to one end of the outlet of the second gas storage tank 2, and a valve is installed at one end of the outlet of the third gas storage tank 3.

[0026] One end of the inlet of the first gas storage tank 1 is used to connect to the nitrogen source on the external wall. A valve is installed between the external nitrogen source and the inlet pipe of the first gas storage tank 1. By controlling the on / off of the external nitrogen source through an independent valve, pressure fluctuations caused by continuous connection between the gas storage tank 1 and the gas source during non-filling stages can be avoided. This provides a basis for subsequent pressure stability control and prevents subsequent system pressure instability caused by gas source pressure fluctuations being directly transmitted to the gas storage tank 1.

[0027] Pressure sensor 4 is used to monitor the nitrogen pressure output from the first gas storage tank 1, and flow sensor 5 is used to monitor the nitrogen flow rate.

[0028] A pressure sensor 4 is also installed on the connecting pipe between the booster cylinder 7 and the second air tank 2.

[0029] The second storage tank 2 is used for storing pressurized nitrogen. A valve is installed between the second storage tank 2 and the third storage tank 3. The second storage tank 2 and the third storage tank 3 are isolated by the valve, forming a two-stage pressure buffer system: when the third storage tank 3 is filling the metal powder container, the second storage tank 2 can continuously supply gas, avoiding interruption of filling or pressure fluctuation due to pressure drop in the third storage tank 3; the valve can be manually / automatically controlled to control the connection time between the two tanks, optimizing nitrogen utilization efficiency.

[0030] The outlet pipe of the third gas storage tank 3 is used to connect to the storage container for the metal powder. A pressure sensor 4 and a flow sensor 5 are also installed on the outlet pipe of the third gas storage tank 3. The pressure sensor 4 and flow sensor 5 at the outlet of the third gas storage tank 3 directly monitor the nitrogen parameters entering the metal powder container. Through closed-loop feedback control of the valve opening, the filling flow rate can be dynamically adjusted to ensure that the oxygen adsorbed on the powder surface is completely replaced by laminar nitrogen, solving the problem of incomplete oxygen removal caused by uncontrollable flow rate in traditional devices.

[0031] Valves and pressure sensors 4 are also installed on the inlet and outlet pipes of the booster cylinder 7. The pressure sensor 4 monitors the nitrogen pressure after boosting in real time. If an abnormal pressure is detected, such as below the set value, a system alarm can be triggered or the power of the compressor 6 can be adjusted to ensure that the nitrogen pressure entering the second gas storage tank 2 always meets the process requirements, avoiding unstable subsequent charging pressure due to insufficient boosting. The valves at the inlet and outlet of the booster cylinder 7 can independently control their working states, such as charging, pressure holding, and pressure relief. Together with the pressure sensor 4, they monitor the cylinder pressure in real time. When an abnormal pressure increase is detected, the inlet valve can be quickly closed and the pressure relief valve opened to prevent system pressure loss due to a malfunction of the booster cylinder 7, thus improving overall safety.

[0032] The device employs a multi-stage pressure buffer system, connecting the first gas storage tank 1 to the compressor 6, then to the booster cylinder 7, finally to the second gas storage tank 2, and finally to the third gas storage tank 3. The combined design of the two-stage gas storage tanks (second and third gas storage tanks 2 and booster cylinder 7) eliminates interference factors such as gas source fluctuations and compressor pulses. The flow sensor 5 at the outlet of the third gas storage tank 3, linked to a valve, precisely controls the nitrogen flow rate based on powder characteristics, ensuring sufficient replacement of oxygen adsorbed in the powder gaps. The check valves / valve combinations at the inlet and outlet of the compressor 6 and the booster cylinder 7 form multiple backflow prevention barriers, completely blocking the nitrogen backflow path and preventing air or impurities from entering and causing oxygen concentration rebound.

[0033] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. A nitrogen-filling and oxygen-removing device for transferring metal powder, comprising: The first gas storage tank (1) and the compressor (6) are characterized in that: a pressure sensor (4) and a flow sensor (5) are connected to one end of the outlet of the first gas storage tank (1), a compressor (6) is connected to one end of the outlet of the flow sensor, a booster cylinder (7) is provided at one end of the outlet of the compressor (6), a second gas storage tank (2) is connected to one end of the outlet of the booster cylinder (7), a third gas storage tank (3) is connected to one end of the outlet of the second gas storage tank (2), and a valve is provided at one end of the outlet of the third gas storage tank (3).

2. The metal powder transfer device using nitrogen filling and oxygen removal according to claim 1, characterized in that: One end of the air inlet of the first gas storage tank (1) is used to connect to an external nitrogen source, and a valve is provided between the external nitrogen source and the air inlet pipe of the first gas storage tank (1).

3. The metal powder transfer device using nitrogen filling and oxygen removal according to claim 1, characterized in that: The pressure sensor (4) is used to monitor the nitrogen pressure output by the first gas storage tank (1), and the flow sensor (5) is used to monitor the nitrogen flow rate.

4. The metal powder transfer device with nitrogen filling and oxygen removal according to claim 1, characterized in that: The air inlet of the compressor (6) is connected to one end of the flow sensor (5) through a pipe. The inlet and outlet pipes of the compressor (6) are equipped with check valves for guiding nitrogen flow.

5. The metal powder transfer device using nitrogen filling and oxygen removal according to claim 1, characterized in that: A pressure sensor (4) is also installed on the connecting pipe between the booster cylinder (7) and the second air tank (2).

6. A nitrogen-filling and oxygen-removing device for metal powder transfer according to claim 5, characterized in that: The second gas storage tank (2) is used to store pressurized nitrogen gas, and a valve is provided between the second gas storage tank (2) and the third gas storage tank (3).

7. A nitrogen-filling and oxygen-removing device for metal powder transfer according to claim 1, characterized in that: The outlet pipe of the third gas tank (3) is used to connect to the storage container of metal powder. A pressure sensor (4) and a flow sensor (5) are also installed on the outlet pipe of the third gas tank (3).

8. A nitrogen-filling and oxygen-removing device for metal powder transfer according to claim 1, characterized in that: The inlet and outlet pipes of the booster cylinder (7) are also equipped with valves and pressure sensors (4).

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