JP2019059217A - Gas feeding device - Google Patents

Abstract

To provide a gas feeding device capable of feeding an inert gas into a conveyance pipe while restraining particulate matter from being caught up.SOLUTION: The gas feeding device 30 is provided with a purge nozzle 512 for discharging an inert gas into a conveyance pipe 21. The purge nozzle 512 extends toward a screw 22 from the outside of the conveyance pipe 21. A discharge port 63 provided at the tip of the purge nozzle 512 positions in the conveyance pipe 21. A gap G equal to or larger than one particle of particulate matter interposes between the discharge port 63 and the periphery of the screw 22. Therefore, while particulate matter is being restrained to be caught up between the discharge port 63 of the purge nozzle 512 and the screw, the inert gas can be efficiently fed into the conveyance pipe 21.SELECTED DRAWING: Figure 2

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a gas supply device for supplying an inert gas to a device for transporting particulate material by rotating a screw disposed in the delivery tube while heating the particulate material in the delivery tube.

  Conventionally, an injection molding machine heats and heats resin pellets (particulates and particles) supplied from the pellet supply device at the front stage while rotating the screw while conveying the resin pellets (particulate matter). Then, the resin pellet melted by heating is injected from the transfer pipe into the mold. A conventional injection molding machine is described, for example, in Patent Document 1.

JP-A-8-66938

  The delivery pipe of the injection molding machine is at a high temperature. Therefore, when oxygen is present in the transfer pipe, the resin pellet may be oxidized. Oxidation of the resin pellet is a factor causing defects such as discoloration in the resin product after molding.

  As a method for preventing such oxidation of resin pellets, it is conceivable to supply an inert gas into the transfer pipe to reduce the oxygen concentration in the transfer pipe. For example, it is conceivable to insert a purge nozzle into the transfer pipe and discharge nitrogen gas from the purge nozzle. At that time, in order to efficiently replace the air around the resin pellet in the transfer pipe with nitrogen gas, it is preferable to dispose the discharge port of the purge nozzle close to the resin pellet in the transfer pipe. However, if the discharge port of the purge nozzle is too close to the screw, resin pellets may be caught between the discharge port of the purge nozzle and the screw. Also, there is a possibility that the resin pellet may intrude into the discharge port of the purge nozzle and be clogged.

  The present invention has been made in view of such circumstances, and efficiently supplies inert gas into the transfer pipe while suppressing the powder particles from being caught between the discharge port of the purge nozzle and the screw. It is an object of the present invention to provide a gas supply device capable of

  In order to solve the above-mentioned problems, according to a first aspect of the present invention, an inert gas is used to transport the particulate material by rotating the screw disposed in the delivery tube while heating the particulate material in the delivery tube. A gas supply device for supplying a gas, the purge nozzle discharging an inert gas into the transfer pipe, the purge nozzle extending from the outside of the transfer pipe toward the screw, and a discharge port provided at the tip thereof A gap of one or more pieces of the powder particles is interposed between the discharge port and the outer peripheral portion of the screw, which is located in the transfer pipe.

  According to a second aspect of the present invention, in the gas supply device according to the first aspect, the purge nozzle includes a first pipe portion positioned outside the transfer pipe, and the first pipe portion refracts from the first pipe portion toward the screw. And an extending second pipe portion, and the discharge port is provided at a tip end of the second pipe portion.

  A third invention of the present application is the gas supply device according to the first invention or the second invention, wherein the discharge port has a size in which the granular material can not enter.

  A fourth invention of the present application is the gas supply device according to the third invention, wherein the discharge port has a flat cylindrical shape, and the minor diameter of the inner peripheral portion of the discharge port is smaller than the external dimension of the powder .

  A fifth invention of the present application is the gas supply device according to any one of the first invention to the fourth invention, comprising: a nozzle member having a cylindrical portion and the purge nozzle extending from an inner peripheral surface of the cylindrical portion A holding member having a circular hole into which the cylindrical portion is fitted, and a pair of annular plates sandwiching the cylindrical portion and fixed to the holding member.

  A sixth invention of the present application is the gas supply device of the fifth invention, wherein the nozzle member further has an outlet through which the gas in the transfer pipe flows out.

  A seventh invention of the present application is the gas supply device of the sixth invention, further comprising an oximeter that measures the oxygen concentration in the gas flowing out from the outlet.

  An eighth invention of the present application is the gas supply device according to any one of the first invention to the sixth invention, further comprising a supply piping unit for supplying an inert gas to the purge nozzle.

  A ninth invention of the present application is the gas supply device according to the eighth invention, wherein the supply piping portion has a heating portion for heating an inert gas supplied to the purge nozzle.

  A tenth invention of the present application is the gas supply apparatus according to the eighth invention or the ninth invention, wherein the supply piping section has an oximeter for measuring the oxygen concentration in the inert gas supplied to the purge nozzle.

  An eleventh invention of the present application is the gas supply apparatus according to any one of the eighth invention to the tenth invention, wherein the supply piping unit measures a flow rate of the inert gas supplied to the purge nozzle. Further comprising

  The twelfth invention of the present application is the gas supply apparatus according to any one of the eighth invention to the eleventh invention, wherein the supply piping unit generates nitrogen gas as the inert gas and supplies it to the piping. An inert gas generator is further provided.

  According to the first to twelfth inventions of the present application, the inert gas can be efficiently supplied into the transport pipe while suppressing the powder particles from being caught between the discharge port of the purge nozzle and the screw.

  In particular, according to the third invention of the present application, it is possible to prevent the granular material from invading the discharge port of the purge nozzle.

  In particular, according to the fourth aspect of the present invention, the opening area of the discharge port can be maintained at a certain level or more while preventing the intrusion of powder and granular material into the discharge port, and the inert gas can be discharged while suppressing the occurrence of turbulent flow. .

  In particular, according to the fifth invention of the present application, the nozzle member can be easily replaced by removing the annular plate from the holding member.

  In particular, according to the sixth invention of the present application, the gas in the transfer pipe can be collected by the sampling nozzle provided in the nozzle member.

  In particular, according to the ninth invention of the present application, it is possible to suppress a decrease in the temperature of the granular material before being introduced into the transport pipe.

FIG. 1 is a schematic view of an injection molding system. FIG. 1 is a partial cross-sectional view of an injection molding system. FIG. 2 is a cross-sectional view of a nozzle assembly. FIG. 5 is an exploded cross-sectional view of a nozzle assembly. It is the figure which looked at a purge nozzle and a screw from the drive mechanism side. It is the figure which looked the purge nozzle and screw which concern on a modification from the drive mechanism side. It is sectional drawing of the nozzle assembly which concerns on a modification. It is a fragmentary sectional view of the injection molding system concerning a modification.

<1. About injection molding system>
FIG. 1 is a schematic view of an injection molding system 1 including a gas supply device 30 according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional view of the injection molding system 1. The injection molding system 1 transports resin pellets, which are powdery particles, sequentially, melts the resin pellets, injects them into the mold 40, and hardens the resin in the mold 40, thereby making the resin product possible. It is a system to manufacture. As shown in FIGS. 1 and 2, the injection molding system 1 has a pellet supply device 10, an injection device 20, and a gas supply device 30.

  The pellet supply device 10 is a device for supplying resin pellets to the injection device 20. The pellet feeder 10 is disposed on the top of the injection unit 20. The pellet supply device 10 has a hopper 11 and a supply pipe 12. The resin pellets before being supplied are stored in the hopper 11. The supply pipe 12 extends downward from the lower end of the hopper 11. The supply pipe 12 is provided with an on-off valve 121. When the on-off valve 121 is opened, resin pellets stored inside the hopper 11 are supplied to the injection device 20 through the supply pipe 12.

  The pellet supply device 10 may have a mechanism for heating and drying the resin pellets in the hopper 11 and a mechanism for stirring the resin pellets in the hopper 11.

  The injection device 20 is a device that melts the resin pellet supplied from the pellet supply device 10 while transporting it, and injects it into the mold 40. The injection device 20 has a transport pipe 21, a screw 22, a drive mechanism 23, and a heater 24. The transfer pipe 21 is a cylindrical container extending in the horizontal direction. A supply port 210 for receiving the resin pellet supplied from the pellet supply device 10 is provided on the rear upper surface of the transport pipe 21. The lower end portion of the supply pipe 12 described above is connected to the supply port 210 via a nozzle assembly 31 described later.

  The screw 22 is disposed inside the transport pipe 21. As shown in FIG. 2, the screw 22 has a screw shaft 221 and a blade 222. The screw shaft 221 is disposed horizontally along the center of the transport pipe 21. The blades 222 project outward from the outer peripheral surface of the screw shaft 221. Further, the blades 222 spirally spread around the screw shaft 221.

  The end of the screw shaft 221 is connected to the drive mechanism 23. When the drive mechanism 23 is operated, the screw 22 rotates around the screw shaft 221. Thereby, the resin pellet in the conveyance pipe 21 is pushed by the blade 222 and conveyed to the mold 40 side.

  Further, the resin pellet in the transport pipe 21 is heated by the heater 24 while being transported by the screw 22. Thereby, the resin pellet is gradually melted. Thereafter, the melted resin is injected into the inside of the mold 40 from an injection port 211 provided at the tip of the transfer pipe 21.

  The gas supply device 30 is a device that supplies nitrogen gas, which is an inert gas, to the inside of the transfer pipe 21. As shown in FIGS. 1 and 2, the gas supply device 30 includes a nozzle assembly 31 and a supply piping unit 32 that supplies nitrogen gas to the nozzle assembly 31.

  FIG. 3 is a cross-sectional view of the nozzle assembly 31. FIG. 4 is an exploded cross-sectional view of the nozzle assembly 31. As shown in FIGS. 2 to 4, the nozzle assembly 31 has a nozzle member 51, a holding member 52, and a pair of annular plates 53 and 54.

  The nozzle member 51 has a cylindrical portion 511 and a purge nozzle 512. The cylindrical portion 511 is a cylindrical portion that supports the purge nozzle 512. The cylindrical portion 511 has a gas introduction hole 513 which is a through hole for introducing nitrogen gas. The purge nozzle 512 is a small cylindrical nozzle. The cylindrical portion 511 and the purge nozzle 512 are integrated into one member.

  The purge nozzle 512 of the present embodiment is a substantially L-shaped nozzle having a first pipe portion 61 and a second pipe portion 62. The first tube portion 61 extends horizontally from the portion of the inner peripheral surface of the cylindrical portion 511 where the gas introduction hole 513 is provided toward the inside of the cylindrical portion 511. The second pipe portion 62 is bent from the tip of the first pipe portion 61 and extends downward. A discharge port 63 for discharging nitrogen gas is provided at the tip (lower end) of the second pipe portion 62.

  As shown in FIG. 2, in the state where the gas supply device 30 is incorporated in the injection molding system 1, the cylindrical portion 511 and the first pipe portion 61 are located outside the transfer pipe 21. The second pipe portion 62 extends from the tip of the first pipe portion 61 toward the screw 22 in the transport pipe 21. At least the discharge port 63 of the second pipe portion 62 is located in the transport pipe 21.

  The holding member 52 is a plate-like member that holds the nozzle member 51. The holding member 52 has a circular hole 520 which is a through hole at the center. As shown in FIG. 2, the holding member 52 is disposed between the upper surface around the supply port 210 of the transport pipe 21 and the lower end of the supply pipe 12. And the conveyance pipe 21, the holding member 52, and the supply pipe 12 are mutually fixed by fixing tools (illustration omitted), such as a screw. Further, the holding member 52 is provided with a vent hole 521. The vent hole 521 extends in the horizontal direction between the outer end surface of the holding member 52 and the inner peripheral surface. The cylindrical portion 511 of the nozzle member 51 is fitted in the circular hole 520 of the holding member 52 so that the vent hole 521 and the gas introduction hole 513 overlap.

  The annular plates 53 and 54 are members for fixing the nozzle member 51 to the holding member 52. The annular plates 53 and 54 are respectively annular and plate-like thinner than the holding member 52. One annular plate 53 is disposed below the cylindrical portion 511 of the nozzle member 51 fitted into the holding member 52. The other annular plate 54 is disposed on the top of the cylindrical portion 511 of the nozzle member 51 fitted in the holding member 52. That is, the cylindrical portion 511 is vertically sandwiched by the pair of annular plates 53 and 54. Further, the pair of annular plates 53 and 54 is fixed to the holding member 52 by a fixing tool (not shown) such as a screw. Thereby, the nozzle member 51, the holding member 52, and the pair of annular plates 53 and 54 are fixed to each other.

  For the material of the nozzle member 51, the holding member 52, and the pair of annular plates 53, 54, for example, a metal such as stainless steel is used. However, some or all of these members may be made of a material other than metal.

  The supply piping unit 32 is a piping system for supplying nitrogen gas to the purge nozzle 512. As shown in FIG. 2, the supply piping unit 32 of the present embodiment includes a nitrogen gas generation unit 321, a flow rate adjustment unit 322, a flow meter 323, an oximeter 324, and a heating unit 325. The flow rate adjustment unit 322, the flow meter 323, the oximeter 324, and the heating unit 325 are provided in this order from the upstream side on the path of the pipe 320 connecting the nitrogen gas generation unit 321 and the vent hole 521 of the holding member 52. Be

  The nitrogen gas generation unit 321 separates and generates nitrogen gas from air using a nitrogen separation membrane. The flow rate adjustment unit 322 adjusts the flow rate of nitrogen gas flowing through the pipe 320. The flow meter 323 measures the flow rate of nitrogen gas flowing through the pipe 320. The oximeter 324 measures the oxygen concentration in the nitrogen gas flowing through the pipe 320. The heating unit 325 has a heater for heating the nitrogen gas flowing through the pipe 320 and a temperature sensor for measuring the temperature of the nitrogen gas. The nitrogen gas generator 321 may not necessarily use a nitrogen separation membrane. For example, a cryogenic nitrogen gas generator or a PSA type nitrogen gas generator may be used, or a nitrogen cylinder may be used.

  The nitrogen gas supplied from the nitrogen gas generation unit 321 to the piping 320 is introduced into the vent hole 521 and the gas introduction hole 513 through the flow rate adjustment unit 322, the flow meter 323, the oxygen concentration meter 324, and the heating unit 325 described above. Be done. Then, the introduced nitrogen gas is discharged from the discharge port 63 into the inside of the transfer pipe 21 through the purge nozzle 512. Thus, the air inside the transfer pipe 21 is replaced with nitrogen gas. As a result, the oxygen concentration in the internal space of the transfer pipe 21 is reduced, and the oxidation of the resin pellet is suppressed.

  FIG. 5 is a view of the purge nozzle 512 and the screw 222 as viewed from the drive mechanism 23 side. As shown in FIGS. 2 and 5, the discharge port 63 of the purge nozzle 512 is disposed in the vicinity of the screw 22 inside the transfer pipe 21. Therefore, the nitrogen gas discharged from the discharge port 63 is agitated by the screw 22 and spreads efficiently in the transfer pipe 21. Therefore, the air in the transfer pipe 21 is more efficiently replaced with nitrogen gas.

  However, as shown in the enlarged view in FIG. 2 and in FIG. 5, a gap G is provided between the discharge port 63 of the purge nozzle 512 and the outer peripheral portion of the screw 22 (the outer end of the blade 222). Therefore, the purge nozzle 512 can discharge the nitrogen gas into the transfer pipe 21 without contacting the screw 22. Further, the gap G has a dimension equal to or larger than one resin pellet to be treated (average value of outer diameters of the resin pellets). In this way, the resin pellet can be prevented from being caught between the discharge port 63 of the purge nozzle 512 and the outer end of the blade 222. In addition, if said clearance gap G is two or more pieces of a resin pellet, it is more preferable. Specifically, the dimension of the gap G may be, for example, 5 mm or more.

  Further, as shown in FIG. 3, in the present embodiment, the discharge port 63 of the purge nozzle 512 has a flat cylindrical shape. Specifically, the inner peripheral portion of the discharge port 63 is elliptical in a bottom view. As described above, when the discharge port 63 has a flat cylindrical shape, the opening area of the discharge port 63 can be maintained at a certain level or more while preventing the granular material from entering the discharge port 63. Therefore, the inert gas can be discharged while suppressing the occurrence of turbulent flow. Preferably, at least the short diameter of the inner peripheral portion of the discharge port 63 is smaller than the external dimension of the resin pellet to be treated.

  Further, as described above, the nozzle member 51 of the present embodiment is fixed to the holding member 52 by the cylindrical portion 511 being held between the pair of annular plates 53 and 54. Therefore, by removing the annular plates 53 and 54 from the holding member 52, the nozzle member 51 can be easily attached and detached. Therefore, maintenance such as cleaning of the nozzle member 51 is easy. In addition, it is also possible to prepare in advance a plurality of nozzle members 51 having different dimensions of the purge nozzle 512, and replace the nozzle members 51 according to the situation.

  In addition, the gas supply device 30 of the present embodiment has a heating unit 325 that heats the inert gas supplied to the purge nozzle 512. Thereby, high temperature nitrogen gas can be discharged from the purge nozzle 512. A part of the discharged high-temperature nitrogen gas also spreads near the supply port 210. For this reason, it can suppress that the temperature of the resin pellet before injecting | throwing-in to the conveyance pipe 21 falls. In particular, in the present embodiment, the heating unit 325 is disposed immediately before the purge nozzle 512 (the most downstream portion of the pipe 320). Therefore, the inert gas supplied to the purge nozzle 512 can be efficiently heated.

  The temperature of the nitrogen gas discharged from the purge nozzle 512 is preferably higher than the normal temperature (the ambient temperature around the injection molding system 1). Further, the temperature of the nitrogen gas discharged from the purge nozzle 512 is preferably lower than the melting point of the resin pellet in order to prevent the resin pellet from being immediately melted by the spraying of the nitrogen gas.

  In addition, the gas supply device 30 of the present embodiment includes a flow meter 323 and a flow rate adjustment unit 322. Therefore, by operating the flow rate adjustment unit 322 based on the measurement result of the flow meter 323, the discharge amount of nitrogen gas from the purge nozzle 512 can be adjusted. If the discharge amount of the nitrogen gas from the purge nozzle 512 is too small, the air in the transfer pipe 21 can not be efficiently replaced with the nitrogen gas. On the other hand, if the discharge amount of nitrogen gas from the purge nozzle 512 is too large, turbulent flow of nitrogen gas may occur in the transfer pipe 21, whereby outside air may be caught from the gap of the transfer pipe 21. Therefore, it is preferable that the discharge amount of the nitrogen gas from the purge nozzle 512 be adjusted to an amount capable of efficiently replacing the air in the transfer pipe 21 with the nitrogen gas and in which the entrainment of the outside air hardly occurs. Moreover, in order to suppress the intrusion of the outside air, it is preferable that the pressure inside the transfer pipe 21 be positive pressure than the outside pressure.

<2. Modified example>
As mentioned above, although one embodiment of the present invention was described, the present invention is not limited to the above-mentioned embodiment.

  FIG. 6 is a view of the purge nozzle 512 and the screw 22 according to a modification viewed from the drive mechanism 23 side. In the example of FIG. 6, the discharge port 63 of the purge nozzle 512 is disposed at a position shifted from directly above the screw shaft 221. Thus, the position of the discharge port 63 may not be right above the screw shaft 221. The minimum dimension of the gap G between the discharge port 63 and the screw 22 may be one or more of the powdery particles. However, in such a case, the discharge port 63 is directly above the screw shaft 221 so that the direction of discharge of the nitrogen gas from the discharge port 63 matches the direction of rotation of the screw 22. It is preferable to arrange | position in the position which shifted | deviated to the rotation direction. Thereby, the stirring effect of the nitrogen gas by the blade | wing 222 of the screw 22 can be acquired favorably.

  FIG. 7 is a cross-sectional view of a nozzle assembly 31 according to another modification. FIG. 8 is a partial cross-sectional view of an injection molding system 1 having the nozzle assembly 31. In the examples of FIGS. 7 and 8, the nozzle member 51 has a purge nozzle 512 and a sampling nozzle 514. The purge nozzle 512 is used to discharge nitrogen gas into the transfer pipe 21 as in the above embodiment. The sampling nozzle 514 is used to collect the gas in the transfer pipe 21. An outlet 515 is provided at the tip of the sampling nozzle 514.

  When the sampling nozzle 514 is used, a part of the gas in the transfer pipe 21 flows out from the outlet 515 into the sampling nozzle 514. Then, the gas flows from the sampling nozzle 514 through the outlet pipe 326 to the oximeter 324 as shown in FIG. In this way, the oxygen concentration of the gas collected from the inside of the transfer pipe 21 can be measured. Therefore, according to the measurement result, the oxygen concentration of the nitrogen gas discharged from the purge nozzle 512 can be adjusted. Note that switching of the pipes 320 and 326 connected to the oximeter 324 may be appropriately performed by a valve (not shown). Moreover, you may measure characteristic values (for example, temperature) other than the oxygen concentration of extract | collected gas.

  Further, the sampling nozzle 514 may be used as a path for discharging the air from inside the transfer pipe 21 to the outside when replacing the air in the transfer pipe 21 with nitrogen gas. Since the air pressure in the transfer pipe 21 becomes a positive pressure by the supply of nitrogen gas, air is naturally discharged from the inside of the transfer pipe 21 to the sampling nozzle 514. However, the air in the transfer pipe 21 may be actively sucked into the sampling nozzle 514 using a vacuum pump or the like. Then, the air can be replaced with nitrogen gas at an increased speed. In addition, the outgas generated from the resin pellet in the transfer pipe 21 may be discharged to the outside through the sampling nozzle 514.

  Further, in the above embodiment, the discharge port 63 of the purge nozzle 512 is elliptical. However, the discharge port 63 of the purge nozzle 512 may have another shape such as a circular shape.

  Moreover, in said embodiment, nitrogen gas was used as inert gas. However, instead of nitrogen gas, another gas having a low oxygen concentration may be used as the inert gas.

  Further, each element appearing in the above embodiment or modification may be combined appropriately as long as no contradiction occurs.

DESCRIPTION OF SYMBOLS 1 injection molding system 10 pellet supply apparatus 11 hopper 12 supply pipe 20 injection apparatus 21 conveyance pipe 22 screw 23 drive mechanism 24 heater 30 gas supply apparatus 31 nozzle assembly 32 supply piping part 40 metal mold 51 nozzle member 52 holding member 53 annular plate 54 Annular plate 61 1st pipe section 62 2nd pipe section 63 discharge port 121 opening and closing valve 210 supply port 211 injection port 221 screw shaft 222 blade 320 piping 321 nitrogen gas generating section 322 flow rate adjusting section 323 flow meter 324 oximeter 325 heating section 511 cylindrical portion 512 purge nozzle 513 gas introduction hole 514 sampling nozzle 520 circular hole 521 air hole G clearance

In order to solve the above-mentioned problems, according to a first aspect of the present invention, an inert gas is used to transport the particulate material by rotating the screw disposed in the delivery tube while heating the particulate material in the delivery tube. A gas supply device for supplying a gas, the purge nozzle discharging an inert gas into the transfer pipe, the purge nozzle extending from the outside of the transfer pipe toward the screw, and a discharge port provided at the tip thereof A gap of one or more pieces of the powder particles is interposed between the discharge port and the outer peripheral portion of the screw, and the discharge port is in a flat cylindrical shape, and the discharge port is located in the transfer pipe. The minor diameter of the inner peripheral portion of the powder is smaller than the external dimension of the powder or granular material .

A third invention of the present application is the gas supply device according to the first invention or the second invention , wherein a nozzle member having a cylindrical portion and the purge nozzle extending from an inner peripheral surface of the cylindrical portion, and the cylindrical portion being fitted A holding member having a circular hole, and a pair of annular plates sandwiching the cylindrical portion and fixed to the holding member.

A fourth invention of the present application is the gas supply device of the third invention, wherein the nozzle member further has an outlet through which the gas in the transfer pipe flows out.

A fifth invention of the present application is the gas supply device of the fourth invention, further comprising an oximeter for measuring the oxygen concentration in the gas flowing out from the outlet.

A sixth invention of the present application is the gas supply device according to any one of the first invention to the fourth invention, further comprising a supply piping unit for supplying an inert gas to the purge nozzle.

A seventh invention of the present application is the gas supply device according to the sixth invention, wherein the supply piping portion has a heating portion for heating an inert gas supplied to the purge nozzle.

An eighth invention of the present application is the gas supply apparatus according to the sixth invention or the seventh invention, wherein the supply piping section has an oximeter for measuring the oxygen concentration in the inert gas supplied to the purge nozzle.

A ninth invention of the present application is the gas supply apparatus according to any one of the sixth invention to the eighth invention, wherein the supply piping unit measures a flow rate of the inert gas supplied to the purge nozzle. Further comprising

A tenth invention of the present application is the gas supply apparatus according to any one of the sixth invention to the ninth invention, wherein the supply piping unit generates nitrogen gas as the inert gas and supplies it to the piping. An inert gas generator is further provided.

According to the first to tenth inventions of the present application, the inert gas can be efficiently supplied into the transfer pipe while suppressing the powder particles from being caught between the discharge port of the purge nozzle and the screw.

Further , according to the first to tenth inventions of the present application, it is possible to prevent the granular material from invading the discharge port of the purge nozzle.

Further , according to the first invention to the tenth invention of the present application, the opening area of the discharge port can be maintained at a certain level or more while preventing the intrusion of the granular material into the discharge port, and the generation of turbulent flow is suppressed while inactive. It can discharge gas.

In particular, according to the third invention of the present application, the nozzle member can be easily replaced by removing the annular plate from the holding member.

In particular, according to the fourth invention of the present application, the gas in the transfer pipe can be collected by the sampling nozzle provided in the nozzle member.

In particular, according to the seventh invention of the present application, it is possible to suppress a decrease in the temperature of the granular material before being introduced into the transport pipe.

Claims (12)

A gas supply apparatus for supplying an inert gas to an apparatus for conveying powdery particles by rotation of a screw disposed in the conveyance pipe while heating powdery particles in the conveyance pipe,
A purge nozzle for discharging an inert gas into the transfer pipe;
The purge nozzle extends from the outside of the transfer pipe toward the screw, and a discharge port provided at the tip of the purge nozzle is located in the transfer pipe.
A gas supply device, wherein a gap of one or more pieces of the powder and granular material intervenes between the discharge port and an outer peripheral portion of the screw. The gas supply apparatus according to claim 1, wherein
The purge nozzle is
A first pipe portion located outside the transfer pipe;
A second pipe portion that is refracted from the first pipe portion and extends toward the screw;
Have
The gas supply apparatus in which the said discharge port is provided in the front-end | tip of a said 2nd pipe part. The gas supply apparatus according to claim 1 or 2, wherein
The said discharge port is a gas supply apparatus which has the magnitude | size which the said granular material can not penetrate | invade. The gas supply device according to claim 3, wherein
The discharge port has a flat cylindrical shape,
The short diameter of the inner peripheral part of the said discharge port is a gas supply apparatus smaller than the external dimension of the said granular material. The gas supply device according to any one of claims 1 to 4, wherein
A nozzle member having a cylindrical portion, and the purge nozzle extending from an inner circumferential surface of the cylindrical portion;
A holding member having a circular hole into which the cylindrical portion is fitted;
A pair of annular plates sandwiching the cylindrical portion and fixed to the holding member;
A gas supply device comprising: The gas supply apparatus according to claim 5, wherein
The nozzle member is
The gas supply device further comprising an outlet from which the gas in the transfer pipe flows out. The gas supply apparatus according to claim 6, wherein
The gas supply device further provided with an oximeter which measures the oxygen concentration in the gas which flowed out from the said outlet. The gas supply device according to any one of claims 1 to 6, wherein
The gas supply device further comprising a supply piping unit that supplies an inert gas to the purge nozzle. The gas supply apparatus according to claim 8, wherein
The supply piping unit is
The gas supply apparatus which has a heating part which heats the inert gas supplied to the said purge nozzle. The gas supply device according to claim 8 or 9, wherein
The supply piping unit is
The gas supply device which has an oximeter which measures the oxygen concentration in the inert gas supplied to the said purge nozzle. A gas supply apparatus according to any one of claims 8 to 10, wherein
The supply piping unit is
The gas supply device further comprising a flow meter that measures the flow rate of the inert gas supplied to the purge nozzle. The gas supply device according to any one of claims 8 to 11, wherein
The supply piping unit is
The gas supply device further comprising an inert gas generation unit that generates nitrogen gas as the inert gas and supplies the nitrogen gas to the pipe.

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