JP3197498U - Gas blowing circuit - Google Patents

Abstract

A gas blowing circuit that blows gas into a ladle plug containing molten metal to prevent the plug from being clogged and that can be used stably for a long time. A gas blowing circuit includes a first pipe 11 for connecting a gas inlet 1 for introducing gas and a gas outlet 2 for blowing gas to a plug of a ladle containing molten metal, and a gas inlet 1. And the second piping 12 for connecting the pressure accumulating cylinder 3 and the third piping 13 for connecting the pressure accumulating cylinder 3 and the gas outlet 2, and the first piping 11 and the second piping 12 are check valves 21, 22. It has. The check valves 21 and 22 have a valve opening and a valve seat at one end, and close the valve opening by coming into contact with the valve main body having a passage through which gas flows to the valve opening and the valve seat, and are separated from the valve seat. This is a swing type check valve having a valve body that opens the valve port. [Selection] Figure 1

Description

  The present invention relates to a gas blowing circuit for supplying gas to a plug attached to a ladle in which molten metal is accommodated.

  In the field of metal refining, secondary refining is performed after primary refining using a melting furnace such as an electric furnace or converter, in order to remove impurities from the molten metal or to add component elements. As this secondary refining, so-called ladle refining, in which a molten metal is taken out from a ladle, is widely practiced.

  The ladle is configured as a container for containing molten metal and transporting it in the plant. The bottom of the ladle is filled with an inert gas such as argon or nitrogen, oxygen, etc. (depending on the application) Different) plugs are provided for injecting gas. In ladle refining, a plug pipe is connected to a gas source installed in a plant, and the molten metal is agitated by blowing gas from the plug into the molten metal accommodated in the molten metal accommodating portion.

  When transferring a ladle containing molten metal in the plant, it is necessary to disconnect the ladle plug from the gas source. However, if the plug is disconnected from the gas source, the gas in the ladle is removed from the gas source. There is a problem that the molten metal in the ladle cannot be supplied to the molten metal, and enters the passage of the plug and solidifies to cause clogging.

  And this problem is the gas introduction provided between the gas inlet and the gas outlet by connecting the gas inlet and the gas outlet to blow out the gas into the ladle plug containing the molten metal. A non-return check that allows only the flow from the gas inlet to the pressure accumulation cylinder by connecting the first pipe having a check valve that allows only the flow from the port to the gas outlet and the gas inlet and the pressure accumulation cylinder. It is known that the problem can be solved by blowing gas into the plug using a gas blowing circuit having a second pipe having a valve and a third pipe connecting the pressure accumulation cylinder and the gas outlet.

JP 2003-239010 A JP 2009-18321 A

  However, when the conventional gas blowing circuit as described above is used for a long time, the plug may occasionally be clogged.

  Therefore, the inventor made extensive efforts and found that the conventional gas blowing circuit has a problem with the check valve.

  That is, the conventional gas blowing circuit uses a lift type check valve as a check valve. This lift type check valve includes a valve body and a shaft coupled to the upper portion of the valve body. The shaft slides in the vertical direction with respect to the upper through hole, and at the same time, the position of the valve body also moves in the vertical direction. This is a check valve that opens and closes the valve. However, the sliding surface of the shaft is exposed to the gas passage and is exposed to the gas containing fine particles. As a result, very rarely, fine particles adhere to the surface of the shaft, preventing the shaft from sliding, causing gas leakage between the valve seat of the check valve and the valve body, and appropriately supplying gas to the plug. It became difficult to supply the gas to the plug, which would cause plug clogging.

  Therefore, a check valve that does not cause gas leakage of the check valve that occurs extremely rarely was obtained. And it confirmed that clogging of a plug decreased by using a swing type check valve instead of a lift type check valve, and completed this invention.

The present invention connects a gas inlet for introducing gas and a gas outlet for blowing gas to a plug of a ladle in which molten metal is accommodated, and from a gas inlet provided between the gas inlet and the gas outlet. A first pipe having a first check valve that allows only a flow to the gas outlet, and a gas inlet and a pressure accumulation cylinder are connected to each other to allow only a flow from the gas inlet to the pressure accumulation cylinder. A gas blowing circuit having a second pipe having a stop valve, and a third pipe connecting the pressure accumulation cylinder and the gas blowing outlet;
The first check valve and the second check valve have a valve opening at one end and a valve seat positioned around the valve opening, and have a valve main body having a passage for flowing gas to the valve opening, and the valve main body is swingable. It is a swing type check valve having a valve body that is held in contact with the valve seat, closes the valve port and opens the valve port by detaching from the valve seat.

  The gas blowing circuit of the present invention includes a first pipe, a second pipe, and a third pipe.

  The first pipe is a pipe that connects the gas inlet and the gas outlet. A gas inlet is disposed upstream of the first pipe, and gas is supplied from an external gas source to the gas inlet. A gas outlet is disposed on the downstream side of the first pipe, and the gas outlet discharges gas to a ladle plug containing a molten metal. Gas supplied from an external gas source flows through the first pipe from the gas inlet to the gas outlet. The first pipe has a first check valve that allows only the flow from the gas inlet to the gas outlet and prevents the backflow of gas. The first check valve is a swing type check valve in which when the gas flows in, the valve body swings with respect to the valve body and is separated from or comes into contact with the valve seat. Therefore, the oscillating surface of the valve element shaft does not appear in the gas passage, and the gas does not contact the oscillating surface of the valve element shaft. Accordingly, the swing of the valve body is not hindered by the gas containing fine particles, and the occurrence of gas leakage in the check valve can be prevented.

  The second pipe is a pipe connecting the gas inlet and the pressure accumulation cylinder. The gas supplied from the external gas source flows through the second pipe from the gas inlet toward the pressure accumulation cylinder. The pressure accumulation cylinder stores a part of the gas flowing from the gas inlet. The accumulator cylinder may have a pipe in the cylinder itself. That is, the second pipe may be configured to connect the gas inlet and the pipe of the pressure accumulation cylinder. In this case, gas is stored in the pressure accumulation cylinder through the piping of the pressure accumulation cylinder itself.

  When the gas inlet is removed from the external gas source and no gas is supplied to the pressure accumulation cylinder, the pressure accumulation cylinder discharges the stored gas. In this case, the gas stored in the pressure accumulation cylinder is supplied to the plug. Naturally, the size, shape, material, etc. of the pressure accumulation cylinder can be changed in consideration of the gas pressure and gas amount blown into the plug, the blowing time, gas components, and the like.

  The second pipe has a second check valve that allows only the flow from the gas inlet to the pressure accumulation cylinder and prevents the backflow of the gas. The second check valve is a swing type check valve having the same configuration as the first check valve and has the same function.

  A 3rd piping is piping which connects a pressure accumulation cylinder and a gas blower outlet. Gas supplied from the gas inlet through the second pipe or gas discharged from the pressure accumulation cylinder flows through the third pipe toward the gas outlet on the downstream side. A pressure adjusting valve that adjusts the gas pressure and a flow rate adjusting valve that adjusts the flow rate of the gas flowing through the pressure adjusting valve may be provided in the third pipe. In this case, the pressure and flow rate of the gas blown out to the plug can be controlled as necessary. Moreover, you may provide the gas filter which removes the microparticles | fine-particles contained in gas, and the safety valve which releases the gas which has a pressure more than a predetermined value to the exterior of a gas blowing circuit.

  In the gas blowing circuit of the present invention, the gas containing fine particles does not contact the rocking surface of the valve body shaft of the check valve. Therefore, the valve body is not hindered by the gas containing fine particles. As a result, the check valve can be prevented from leaking gas and the gas can be stably supplied to the plug, and the plug can be further prevented from being clogged.

It is the schematic of the gas blowing circuit of Embodiment 1. FIG. It is sectional drawing of the non-return valve with which the gas blowing circuit of this invention is provided. It is the schematic of the gas blowing circuit of Embodiment 2. It is sectional drawing of the non-return valve with which the conventional gas blowing circuit is provided.

(Embodiment 1)
As shown in FIG. 1, the gas blowing circuit of the present invention has a first pipe 11, a second pipe 12, and a third pipe 13. The 1st piping 11 and the 2nd piping 12 are joined, and it has the gas inlet 1 connected with an external gas source (not shown) upstream from this junction. The 1st piping 11 and the 3rd piping 13 are joined, and it has the gas blower outlet 2 connected with the plug (not shown) of the ladle in which the molten metal was accommodated downstream from this joining point.

  The first pipe 11 is a pipe that connects the gas inlet 1 and the gas outlet 2. The first pipe 11 includes a first check valve 21 that allows only a gas flow from the gas inlet 1 to the gas outlet 2 between the gas inlet 1 and the gas outlet 2. The second pipe 12 is a pipe connecting the gas inlet 1 and the pressure accumulation cylinder 3. The second pipe includes a second check valve 22 that allows only the gas flow from the gas inlet 1 to the pressure accumulation cylinder 3 between the gas inlet 1 and the pressure accumulation cylinder 3. The third pipe 13 is a pipe connecting the pressure accumulation cylinder 3 and the gas outlet 2. The third pipe 13 includes, in order from the upstream side, a gas filter 61 that removes particulates contained in the gas, a safety valve 23 that allows excess gas to escape outside the gas blowing circuit, and a pressure adjustment valve that adjusts the gas pressure. 71 and a flow rate adjustment valve 72 for adjusting the flow rate of gas.

  As shown in FIG. 2, the first check valve 21 and the second check valve 22 are swing type check valves. This swing type check valve has a valve body 31 at one end and a valve seat 32 positioned around the valve opening 31, and has a valve body 30 having a passage through which gas flows to the valve opening 31 and the valve body 30. The check valve has a valve body 33 that is held movably and closes the valve port 31 by coming into contact with the valve seat 32 and opens the valve port 31 by detaching from the valve seat 32.

  When gas is supplied from an external gas source to the gas inlet 1, one gas flows toward the gas outlet 2 via the first pipe 11. The other gas flows toward the gas outlet 2 through the second pipe 12 and the third pipe 13. At this time, the pressure accumulation cylinder 3 stores a part of the other gas flowing from the gas inlet 1.

  When the ladle containing the molten metal is transferred, the gas inlet 1 is removed from the external gas source. At this time, no gas is supplied to the gas blowing circuit from an external gas source. Instead, the gas stored in the pressure accumulation cylinder 3 is discharged, so that the gas discharged from the pressure accumulation cylinder 3 flows through the third pipe 13 and is supplied to the gas outlet 2.

  The gas discharged from the pressure accumulation cylinder 3 does not flow backward from the gas outlet 2 to the gas inlet 1 through the first pipe 11 by the first check valve 21 provided in the first pipe 11. Further, the gas discharged from the pressure accumulation cylinder 3 does not flow backward from the pressure accumulation cylinder 3 to the gas inlet 1 through the second pipe 12 by the second check valve provided in the second pipe 12.

  The first check valve 21 provided in the first pipe 11 is configured so that the valve body 33 swings from the valve seat 32 when the gas supplied from an external gas source flows from the gas inlet 1 toward the gas outlet 2. The gas passes through the first check valve 21 for separation. However, when the gas discharged from the pressure accumulation cylinder 3 to the first check valve 21 is about to flow from the gas outlet 2 toward the gas inlet 1, the valve body 33 swings and comes into contact with the valve seat 32, so that the gas flows. Does not pass through the first check valve. When the valve body 33 is swung, the rocking surface of the shaft of the valve body 33 is not exposed to the gas containing fine particles.

  In the second check valve 22 provided in the second pipe, the valve body 33 swings and separates from the valve seat 32 when the gas supplied from the external gas source flows from the gas inlet 1 toward the pressure accumulation cylinder 3. Therefore, the gas passes through the second check valve 22. However, when the gas discharged from the pressure accumulation cylinder 3 to the second check valve 22 flows from the pressure accumulation cylinder 3 toward the gas introduction port 1, the valve body 33 swings and comes into contact with the valve seat 32, so that the gas is first 2 Do not pass through the check valve. When the valve body 33 is swung, the rocking surface of the shaft of the valve body 33 is not exposed to the gas containing fine particles.

  The gas discharged from the pressure accumulation cylinder 3 is cleaned by the gas filter 61 in the third pipe 13, and then the gas pressure and the flow rate are controlled by the downstream pressure regulating valve 71 and the flow regulating valve 72.

  In the gas blowing circuit of the present invention, the rocking surface of the shaft of the valve body 33 in the first check valve 21 and the second check valve 22 is not exposed to the gas containing fine particles. The swinging of the valve body 33 is not hindered, and no gas leakage occurs in the check valve. As a result, the gas necessary for preventing plug clogging can be appropriately supplied for a long time.

(Embodiment 2)
As shown in FIG. 3, the gas blowing circuit according to the second embodiment includes a first pipe 11, a second pipe 12, and a third pipe 43. The 1st piping 11 and the 2nd piping 12 are joined, and have the gas inlet 1 upstream from this junction. The 1st piping 11 and the 3rd piping 43 are joined, and have the gas blower outlet 2 in the downstream rather than this junction.

  The first pipe 11 is a pipe that connects the gas inlet 1 and the gas outlet 2. The first pipe 11 includes a first check valve 21 between the gas inlet 1 and the gas outlet 2.

  The second pipe 12 is a pipe connecting the gas inlet 1 and the pressure accumulation cylinder 3. The second pipe 12 includes a second check valve 22 between the gas inlet 1 and the pressure accumulation cylinder 3.

  In addition, the 1st piping 11, the 2nd piping 12, the gas inlet 1, the gas blower outlet 2, the pressure accumulation cylinder 3, the 1st check valve 21, and the 2nd check valve 22 in Embodiment 2 are as follows. It is the same structure as the gas blowing circuit in Embodiment 1, and has the same function.

  The third pipe 43 is a pipe that connects the pressure accumulation cylinder 3 and the gas outlet 2. The third pipe 43 is branched, and one branched pipe and the other branched pipe are connected to the gas outlet 2.

  The third pipe 43 includes a safety valve 53 and a gas filter 91 in order from the upstream side between the branch points of the pressure accumulation cylinder 3 and the third pipe 43.

  One pipe branched by the third pipe 43 includes, in order from the branch point on the upstream side, a pressure adjustment valve 71 (a) for adjusting the gas pressure, a flow rate adjustment valve 72 (a) for adjusting the gas flow rate, and a gas The gas filter 91 (a) for removing the fine particles contained in the gas and the on-off valve 73 (a) for opening and closing the gas flow are provided. Moreover, the other piping branched by the 3rd piping 43 is provided with the same structural member as one piping branched, and the pressure regulating valve 71 (b) and the flow regulating valve 72 (b) are sequentially arranged from the upstream branching point. And a gas filter 91 (b) and an on-off valve 73 (b).

  The gas connected to an external gas source and flowing from the gas inlet 1 through the second pipe 12 or the gas discharged from the pressure accumulation cylinder 3 flows through one branched pipe of the third pipe 43 or the other branched pipe.

  The gas flowing through one branched pipe is controlled in gas pressure and flow rate by the pressure regulating valve 71 (a) and the flow rate regulating valve 72 (a), and the gas is cleaned by the gas filter 91 (a). Then, the gas is supplied to the gas outlet 2 by opening the on-off valve 73 (a).

  The gas flowing through the other branched pipe is controlled in gas pressure and flow rate by the pressure regulating valve 71 (b) and the flow rate regulating valve 72 (b), and the gas is cleaned by the gas filter 91 (b). Then, the gas is supplied to the gas outlet 2 by opening the on-off valve 73 (b).

  The gas blowing circuit according to the second embodiment includes a swing type check valve having the same function and function as the first check valve 21 and the second check valve 22 included in the gas blowing circuit according to the first embodiment. . Accordingly, no gas leakage occurs in the check valve, and the gas necessary for preventing plug clogging can be appropriately supplied for a long time.

  Furthermore, by arranging the pressure regulating valve and the flow regulating valve in the third piping 43 in one of the branched piping and the other branched piping, the pressure and flow rate of the gas flowing from the pressure accumulating cylinder 3 can be changed to a plurality of pressure regulating valves and flow rates. It can be highly controlled using a regulating valve.

  The on-off valve 73 (a) and the on-off valve 73 (b) are arranged in one pipe and the other pipe branched from the third pipe 43, and by opening and closing the two on-off valves appropriately, a gas outlet 2 can be prevented from being excessively supplied.

DESCRIPTION OF SYMBOLS 1 Gas inlet 2 Gas outlet 3 Accumulation cylinder 11 1st piping 12 2nd piping 13, 43 3rd piping 21 1st check valve 22 2nd check valve 23, 53 Safety valve 30 Valve body 31 Valve port 32 Valve seat 33 Valve body 61, 91, 91 (a), 91 (b) Gas filter 71, 71 (a), 71 (b) Pressure regulating valve 72, 72 (a), 72 (b) Flow regulating valve 73 (a) 73 (b) On-off valve

Claims (2)

A gas inlet for introducing gas and a gas outlet for blowing gas to a plug of a ladle in which molten metal is accommodated are connected to each other from the gas inlet provided between the gas inlet and the gas outlet. A first pipe having a first check valve that allows only flow to the gas outlet;
A second pipe having a second check valve that connects the gas inlet and the pressure accumulation cylinder and allows only the flow from the gas inlet to the pressure accumulation cylinder;
A gas blowing circuit having a third pipe connecting the pressure accumulation cylinder and the gas blowing outlet;
The first check valve and the second check valve have a valve opening at one end and a valve seat positioned around the valve opening, and have a passage through which gas flows to the valve opening and the valve body. A gas blower characterized in that it is a swing type check valve having a valve body that is held movably and closes the valve opening by contacting the valve seat and opens the valve opening by separating from the valve seat. circuit.   2. The gas blowing circuit according to claim 1, wherein the third pipe includes a pressure regulating valve that regulates a gas pressure and a flow regulating valve that regulates a flow rate of the gas flowing through the pressure regulating valve.

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