JP5100352B2 - Screw feeder for ash conveyance - Google Patents

Description

  The present invention relates to a cyclone ash conveying screw feeder for conveying ash and the like separated from combustion gas by a cyclone.

In this type of screw feeder, a shaft having spiral blades is rotated in the housing to transport ash supplied from the ash supply port into the housing to the end of the housing. It is discharged from the ash outlet provided at the end. In such a screw feeder, various sealing techniques are provided so that ash or the like in the housing does not leak to the outside from the bearing portion of the shaft.
As such a technique, for example, there is a “shaft seal device” disclosed in Patent Document 1.
In this technique, a cylindrical space portion is provided between the casing of the bearing portion and the peripheral surface of the end of the shaft, and a plurality of gland packings are press-fitted into the space portion, and a plurality of gland packings are pressed by a gland packing presser. This is a technique for preventing leakage of liquid or the like by gland packing by being pushed into the space.

Japanese Patent Application Laid-Open No. 08-200285

However, the conventional techniques described above have the following problems.
First, the ash supplied to the screw feeder from the cyclone of the furnace is a powder at high temperature and high pressure, and when such ash touches the gland packing of the bearing, Unbearable to use.
Next, the gland packing is inferior in pressure resistance against high pressure ash and is easily damaged by high pressure ash.
Furthermore, due to its high pressure, a large amount of ash enters between the gland packing and the shaft, and creates a passage-like gap communicating between the gland packing and the shaft.
That is, in the above-described conventional technology, there is a high possibility that the gland packing is thermally deteriorated or damaged, or that a gap is generated between the gland packing and the shaft, which is not useful for preventing leakage of high-temperature and high-pressure ash or the like.
Patent Document 1 discloses a device in which a liquid reservoir is provided between a gland packing presser and a shaft, and liquid or the like that has passed through the gland packing is stored in the liquid reservoir. However, such a device is effective in the case of liquids such as seawater, but is hardly useful for high-temperature and high-pressure ash.
In particular, the high-temperature and high-pressure ash leakage phenomenon is remarkable in the bearing portion close to the ash supply port of the housing, and countermeasures have been desired.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a cyclone ash conveying screw feeder that can almost completely prevent leakage of high-temperature and high-pressure ash supplied from a cyclone. And

In order to achieve the above object, a screw feeder for cyclone ash conveyance according to the present invention has a cylindrical opening with both ends having an ash supply port on the peripheral surface of one end and an ash discharge port on the peripheral surface of the other end. A housing, a shaft that is rotatably inserted into the housing and has a blade formed in a spiral shape along the length direction, and a shaft that is connected to both ends of the housing and rotatably supports the shaft end. And a pair of bearing parts
Of these pair of bearing portions, at least the bearing portion closer to the ash supply port is provided with a casing, and the casing communicates with the opening of the housing and has a small diameter hole through which the shaft end portion is inserted. And a plurality of first sealing members in a cylindrical space portion having a large-diameter hole communicating with the small-diameter hole and defined by the inner peripheral surface of the large-diameter hole and the outer peripheral surface of the shaft end portion. It has a press-fit configuration,
Furthermore, in this cylindrical space part, the cylindrical pressing member is press-fitted from the opening of the said cylindrical space part of the said casing,
Further, at least one annular groove along the inner peripheral surface is formed on the inner peripheral surface of the pressing member, and an annular second sealing member is fitted into each groove, so that the shaft It is characterized by being brought into pressure contact with the end surface.

  With this configuration, when ash or the like is supplied into the housing from the ash supply port while the shaft is rotated in the housing, the spiral blades of the shaft on which the ash or the like rotates causes the housing to move from one end side to the other end side. And discharged to the outside from the ash discharge port side. On the other hand, of the ash supplied to the housing, the ash directed toward the bearing portion tends to escape to the outside from between the casing of the bearing portion and the shaft end portion, but the inner peripheral surface of the large-diameter hole And a plurality of first sealing members press-fitted into a cylindrical space defined by the outer peripheral surface of the shaft end. However, when ash or the like is in a high temperature and high pressure state, the first sealing member of the bearing portion near the ash supply port is thermally deteriorated or damaged by such ash or the like. There may be a gap between the shaft and it may become unusable. However, in the present invention, one or more annular grooves are formed on the inner peripheral surface of the presser member press-fitted into the cylindrical space portion of the casing, and the annular second sealing member is fitted into each groove. Thus, since the structure in pressure contact with the end surface of the shaft is employed, ash and the like that could not be blocked by the first sealing member can be blocked by the second sealing member of the pressing member.

  Here, it is preferable to apply an O-ring (O-ring) having heat resistance and pressure resistance to the second sealing member. This makes it possible to more reliably prevent leakage of ash and the like supplied with high heat and high pressure.

Further, in the presser member, a lubricating oil supply path having one end opened on the surface of the presser member to form a supply port and the other end communicating with the groove is formed. It is preferable that the lubricating oil is filled from the supply port.
With this configuration, the lubricating oil filled in the groove reduces the wear of the second sealing member fitted in the groove. Further, the lubricating oil is interposed between the pressing member and the shaft end portion, between the second sealing member and the shaft end portion, and adsorbs ash and the like that have entered between them.

  As described above in detail, according to the screw feeder for transporting cyclone ash according to the present invention, not only the ash in a high temperature and high pressure state toward the bearing portion is blocked by the first sealing member of the casing, but also the first sealing. Since the ash that could not be blocked by the member is blocked by the second sealing member, there is an excellent effect that leakage of the supplied high-temperature and high-pressure ash or the like can be blocked almost completely.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a cross-sectional view showing a cyclone ash conveying screw feeder according to one embodiment of the present invention, FIG. 2 is an external view of a cyclone ash conveying screw feeder, and FIG. 3 is a cyclone ash conveying screw. It is the elements on larger scale which show the principal part of a feeder.
The cyclone ash conveying screw feeder 1 of this embodiment is a device for collecting high temperature and high pressure ash from a cyclone of a thermal power plant. As shown in FIG. 1, a housing 2, a shaft 3, and a pair of bearings The parts 4 and 5 and the drive motor 6 are provided.

The housing 2 is a cylindrical tube having both ends opened, and has flanges 21 and 22 outside the openings 2a and 2b at both ends. And the tubular ash supply port 23 and the ash discharge port 24 are formed in the vicinity of the flanges 21 and 22, respectively.
The ash supply port 23 is a port for supplying ash or the like from a cyclone (not shown) into the housing 2, and is disposed in the vicinity of the flange 21 that is one end of the housing 2. Specifically, the ash supply port 23 is inclined to the left side and protrudes from the upper peripheral surface of the right end portion of the housing 2, and the ash or the like is passed through the ash supply port 23 above the housing 2. It can be supplied from the inside.
On the other hand, the ash discharge port 24 is a port for discharging ash and the like in the housing 2 to the outside of the housing 2, and is disposed in the vicinity of the flange 22 that is the other end of the housing 2. Specifically, the ash discharge port 24 is inclined to the right and protrudes from the lower peripheral surface of the left end portion of the housing 2, and the ash and the like inside the housing 2 are externally passed through the ash discharge port 24. Can be discharged.

The shaft 3 is rotatably inserted into such a housing 2.
The shaft 3 is a solid shaft body and has a blade 30 at a central portion excluding both end portions 31 and 32.
The blade 30 is a spiral plate formed so as to be wound around the circumferential surface along the length direction of the shaft 3, whereby the entire shaft 3 forms a screw shape.
Such a shaft 3 is set longer than the housing 2, and is inserted into the housing 2 with both end portions 31 and 32 protruding from both ends of the housing 2.
And a pair of bearing parts 4 and 5 are supporting the both ends 31 and 32 of this shaft 3, respectively.

  The bearing portions 4 and 5 are portions that rotatably support both end portions 31 and 32 of the shaft 3, and are respectively connected to flanges 21 and 22 that are both end portions of the housing 2.

As shown in FIG. 3, the bearing portion 4 closer to the ash supply port 23 of the housing 2 is formed using a casing 41 and a gland packing pressing member 46 as a pressing member.
FIG. 4 is a perspective view showing the casing 41 and the gland packing 45, and FIG. 5 is a perspective view showing the gland packing pressing member 46 and the O-ring 48.
As shown in FIG. 4, the casing 41 is a cylindrical body having a small diameter hole 42 having substantially the same diameter as the end portion 31 of the shaft 3 and a large diameter hole 43 communicating with the small diameter hole 42. As shown in FIG. 3, the end portion 31 is inserted into the small diameter hole 42 of the casing 41. A flange 41 a is formed outside the small diameter hole 42, and the flange 41 a is fixed to the flange 21 of the housing 2 with a bolt 71. Thus, the casing 41 and the housing 2 are connected, the small diameter hole 42 is communicated with the opening 2 a of the housing 2, and the end 31 is inserted into the small diameter hole 42 and the large diameter hole 43.

Such a large-diameter hole 43 of the casing 41 forms a cylindrical space portion 40 between the end portion 31 of the shaft 3. Specifically, the inner peripheral surface of the large-diameter hole 43 and the outer peripheral surface of the end portion 31 define a space 40 that is closed on the inner side (left side in FIG. 3) and opened on the outer side (right side in FIG. 3). ing.
Then, six gland packings 45 as first sealing members sandwiching the lantern ring 44 are press-fitted into the space 40. Since the lantern ring 44 and the gland packing 45 are well-known members, description thereof is omitted. In the figure, reference numeral 44 a is a supply path for supplying grease to the lantern ring 44.

On the other hand, the gland packing pressing member 46 is a cylindrical body having substantially the same diameter as the space portion 40 as shown in FIG. Specifically, as shown in FIG. 3, the outer diameter of the gland packing pressing member 46 is set to be substantially the same as the diameter of the large-diameter hole 43, and the inner diameter is substantially the same as the outer diameter of the end portion 31 of the shaft 3. The gland packing pressing member 46 is press-fitted into the space 40 from the opening 40a. The O-ring 81 and the omni seal 82 are attached to the outer peripheral surface 46c and the inner peripheral surface 46d of the gland packing pressing member 46, respectively, so that the space 40 is sealed.
Moreover, as shown in FIG. 5, six notches 46b are provided in the flange 46a provided on the outer side of the gland packing pressing member 46. As shown in FIG. 3, the flange 46 a faces the flange 41 b of the casing 41. The bolt 72 is screwed into the notch 46b of the flange 46a and the screw hole 41c (see FIG. 4) of the flange 41b, and the gland packing pressing member 46 is fixed to the casing 41.

The gland packing pressing member 46 is devised to completely prevent leakage of ash and the like.
That is, as shown in FIGS. 3 and 5, the ring-shaped groove 47 is engraved along the inner peripheral surface 46 d of the gland packing pressing member 46. An O-ring 48 as a second sealing member is fitted into the groove 47 and is pressed against the surface of the end portion 31 of the shaft 3.
The O-ring 48 is an O-ring having high heat resistance and high pressure resistance. In this embodiment, a silicon rubber one is used. The formation position of the groove 47 is set at substantially the center of the inner peripheral surface 46d.
The groove 47 in which the O-ring 48 is fitted is filled with grease G as lubricating oil for reducing wear of the O-ring 48. Specifically, the grease G supply port 49a is formed on the surface of the flange 46a of the gland packing pressing member 46, and the lubricating oil supply path 49 communicating with the groove 47 through the flange 46a from the supply port 49a is formed in the flange 46a. Formed. Then, the grease G was filled into the groove 47 by supplying the grease G from the supply port 49 a to the lubricating oil supply passage 49.

On the other hand, in FIG. 1, the bearing portion 5 closer to the ash discharge port 24 is also formed by using the casing 51 and the gland packing holding member 56 having substantially the same structure as the casing 41 and the gland packing holding member 46 of the bearing portion 4. Yes.
That is, the end portion 32 of the shaft 3 is inserted into the small diameter hole 52 and the large diameter hole 53 of the casing 51, and the cylindrical space portion 50 is formed between the end portion 32. Six gland packings 55 sandwiching the lantern ring 54 are press-fitted into the space part 50, and the gland packing pressing member 56 is press-fitted into the space part 50. Further, the O-ring 81 and the omni seal 82 (not shown) are attached to the gland packing pressing member 56 so that the space 50 is sealed.
In this embodiment, the gland packing pressing member 56 of the bearing portion 5 is not provided with the lubricating oil supply passage 49 filled with the groove 47, the O-ring 48 and the grease G.

  As described above, the shaft 3 supported by the pair of bearing portions 4 and 5 is rotated by the drive motor 6. Specifically, the sprockets 61 and 62 are attached to the end 31 of the shaft 3 and the rotating shaft 6 a of the drive motor 6, the belt 60 is wound around the sprockets 61 and 62, and the rotational force of the drive motor 6 is transmitted to the shaft 3. It has a structure to do.

Next, the operation and effects of the cyclone ash conveying screw feeder of this embodiment will be described.
FIG. 6 is a schematic view showing an attached state of the cyclone ash carrying screw feeder, and FIG. 7 is a cross-sectional view showing the ash carrying action.
When the cyclone ash conveying screw feeder 1 (hereinafter simply referred to as “screw feeder 1”) is used in a thermal power plant or the like, the ash supply port 23 of the screw feeder 1 is connected to a furnace as shown in FIG. The ash discharge port 24 is connected to the supply port 121 of the hopper 120 while being connected to the ash discharge port 112 of the cyclone 110 to which the 100 discharge pipes 101 are connected.

In such a connected state, the drive motor 6 of the screw feeder 1 is driven to rotate the shaft 3.
The ash-containing combustion gas A generated in the furnace 100 is carried into the cyclone 110 through the discharge pipe 101 and separated into gas B and ash C in the cyclone 110. Gas B is sent out to the gas discharge pipe 111 and ash C is sent out to the ash discharge port 112 side. Then, the ash C is carried into the housing 2 through the ash supply port 23 of the screw feeder 1 and is sent to the ash discharge port 24 side by the action of the blade 30 of the rotating shaft 3 as shown in FIG. Then, the ash C is discharged from the ash discharge port 24 and is discharged into the hopper 120 through the supply port 121 as shown in FIG. After the ash C is discharged from the discharge port 122, it is conveyed to an ash treatment device (not shown).

  By the way, as shown in FIG. 7, the ash C directed toward the ash discharge port 24 enters the bearing portion 5 and tries to escape outside before being discharged from the ash discharge port 24. However, since the ash C is cooled while being transported in the housing 2 and is in a low temperature and low pressure state, the gland packing 55 (see FIG. 1) or the gland packing press-fitted into the casing 51 of the bearing portion 5 is used. It is reliably prevented by the O-ring 81 and the omni seal 82 of the holding member 56. In addition, since the ash C is in a low temperature and low pressure state, the gland packing 55 and the like are not thermally deteriorated or damaged even when used for a long time.

On the other hand, when the ash C is fed into the housing 2 from the ash supply port 23, the ash C is in a high temperature and high pressure state of, for example, 10 KPa (kilopascal) at 150 ° C. or higher. For this reason, when the ash C enters the bearing portion 4 side, the gland packing 45 of the casing 41 is directly affected by the ash C.
FIG. 8 is a partial enlarged cross-sectional view showing a state where the ash C has entered the bearing portion 4 side.
That is, as shown in FIG. 8, when the high-temperature and high-pressure ash C comes into contact with the lantern ring 44 and the gland packing 45, the lantern ring 44 and the gland packing 45 are thermally deteriorated in a short period of time due to thermal and pressure effects. Or get damaged. Therefore, there is a risk that the ash C may leak from the bearing portion 4 to the outside due to short-term use.

However, in the screw feeder 1 of this embodiment, as described above, the O-ring 48 is fitted into the groove 47 formed in the inner peripheral surface 46d of the gland packing pressing member 46, and the end portion 31 of the shaft 3 is inserted. Since the groove 47 is filled with the grease G while being pressed against the surface, leakage of the ash C from the bearing portion 4 can be almost completely prevented.
FIG. 9 is a partial enlarged cross-sectional view showing the ash C leakage preventing action by the O-ring 48.
That is, as shown in FIG. 9, the ash C that has passed through the gland packing 45 that cannot prevent the invasion of the ash C due to thermal deterioration or damage hits the O-ring 48 that is in pressure contact with the end portion 31 of the shaft 3, Subsequent intrusions are blocked. Even when the ash C is contacted with the O-ring 48 for a long time, the O-ring 48 is formed of silicon rubber having high heat resistance and pressure resistance, so that it is not subject to thermal deterioration or damage.
Moreover, since the grease G is filled in the groove 47 and wear of the O-ring 48 is reduced, the O-ring 48 can be used for a long period of time.

Such grease G also has a leakage preventing effect on the ash C.
FIG. 10 is a partially enlarged cross-sectional view showing the effect of preventing leakage of ash C by grease G.
The grease G is not contained only in the groove 47 but oozes out to the surface of the end portion 31 and adheres around the O-ring 48 as shown in FIG. For this reason, the ash C not only strikes the O-ring 48 but is also adsorbed by the grease G that has oozed out of the groove 47, so that the ash C passes between the gland packing pressing member 46 and the end portion 31 to the outside. It is almost impossible to leak.

  Thus, according to the screw feeder 1 of this embodiment, the ash C in a high temperature and high pressure state toward the bearing portion 4 is not only blocked by the gland packing 45 but also heat resistance provided in the gland packing pressing member 46. In addition, since the O-ring 48 with high pressure resistance is also prevented, leakage of the high-temperature and high-pressure ash C can be almost completely prevented. Further, since the grease G filled in the groove 47 can reduce the wear of the O-ring 48 and adsorb the ash C, it is possible to extend the life of the O-ring 48 and prevent complete leakage of the ash C. it can.

In addition, this invention is not limited to the said Example, A various deformation | transformation and change are possible within the range of the summary of invention.
For example, in the above-described embodiment, one O-ring 48 is arranged at the center of the inner peripheral surface 46d of the gland packing pressing member 46. However, the present invention is not limited to this, and a plurality of grooves 47 are formed on the inner peripheral surface 46d. The plurality of O-rings 48 may be fitted in these grooves 47.
In the above embodiment, the silicon rubber O-ring 48 is used as the O-ring 48, but an O-ring formed of other materials is also included in the scope of the present invention.
In the above embodiment, the grease G is used as the lubricating oil. However, it is needless to say that lubricating oil other than grease can be used, and lubricating oil such as grease G is used in the groove 47. It is not intended to exclude screw feeders that are not filled from the scope of the present invention.
In the above embodiment, the screw feeder in which the omni seal 82 is mounted on the inner peripheral surface 46d of the gland packing presser member 46 has been illustrated. It is not intended to be excluded from the scope of the invention.
Further, in the above embodiment, the gland packing pressing member 56 of the bearing portion 5 on the ash discharge port 24 side is not provided with the lubricating oil supply passage 49 filled with the groove 47, the O-ring 48 and the grease G. When the screw feeder is used in an environment in which the ash C enters the bearing portion 5, the groove 47, the O-ring 48 and the gland packing pressing member 56 of the bearing portion 5 on the ash discharge port 24 side are also provided. It is preferable to provide a lubricating oil supply passage 49 filled with grease G.

It is sectional drawing which shows the screw feeder for cyclone ash conveyance which concerns on one Example of this invention. It is an external view of the screw feeder for cyclone ash conveyance. It is the elements on larger scale which show the principal part of the screw feeder for cyclone ash conveyance. It is a perspective view which shows a casing and a gland packing. It is a perspective view which shows a gland packing pressing member and an O-ring. It is the schematic which shows the attachment state of the screw feeder for cyclone ash conveyance. It is sectional drawing which shows the conveyance effect | action of ash. It is a partial expanded sectional view which shows the state which the ash penetrate | invaded to the bearing part side. It is a partial expanded sectional view which shows the leak prevention effect of the ash by O-ring. It is a partial expanded sectional view which shows the leak prevention effect of the ash by grease.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1: Screw feeder for cyclone ash conveyance, 2: Housing, 2a, 2b: Opening, 3: Shaft, 4, 5: Bearing part, 6: Drive motor, 23: Ash supply port, 24: Ash discharge port, 30: Blade | wing 31, 32: end, 40, 50: space, 40a: opening, 41, 51: casing, 42, 52: small diameter hole, 43, 53: large diameter hole, 45, 55: gland packing, 46, 56 : Gland packing pressing member, 46d: Inner peripheral surface, 47: Groove, 48: O-ring, 49: Lubricating oil supply path, 49a: Supply port, C: Ash, G: Grease.

Claims (2)

A cylindrical housing having both ends opened with an ash supply port on the peripheral surface at one end and an ash discharge port on the peripheral surface at the other end, and is rotatably inserted into the housing and along the length direction A shaft having a spirally formed blade, and a pair of bearing portions connected to both ends of the housing and rotatably supporting the shaft end,
Of these pair of bearing portions, at least the bearing portion closer to the ash supply port is provided with a casing, and the casing communicates with the opening of the housing and has a small diameter hole through which the shaft end portion is inserted. And a plurality of first sealing members in a cylindrical space portion having a large-diameter hole communicating with the small-diameter hole and defined by the inner peripheral surface of the large-diameter hole and the outer peripheral surface of the shaft end portion. It has a press-fit configuration,
Furthermore, in this cylindrical space part, the cylindrical pressing member is press-fitted from the opening of the said cylindrical space part of the said casing,
Further, at least one annular groove along the inner peripheral surface is formed on the inner peripheral surface of the pressing member, and an annular second sealing member is fitted into each groove, so that the shaft Press against the end surface ,
Furthermore, a lubricating oil supply path is formed in the presser member so that one end opens on the surface of the presser member to form a supply port and the other end communicates with the groove. Inside, is filled with lubricating oil from the supply port,
The screw feeder for ash conveyance characterized by the above-mentioned. In the screw feeder for ash conveyance according to claim 1,
The second sealing member is an O-ring having heat resistance and pressure resistance.
The screw feeder for ash conveyance characterized by the above-mentioned.

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