JP4040250B2 - Pull-out type blower - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to combustion chambers such as boilers and heat exchangers (in this specification, “combustion chamber” is not limited to a portion where combustion is performed, but includes a chamber where combustion gas exchanges heat in the periphery, downstream, etc.) The present invention relates to a plug-type soot blowing device that removes deposits in the combustion chamber by inserting a lance tube into the combustion chamber and injecting high-pressure fluid from the tip of the lance tube.
[0002]
[Prior art]
FIG. 7 is a side cross-sectional view showing an example of a conventional plug-type soot blowing apparatus, and an example of a conventional plug-type soot blowing apparatus will be described based on FIG. The draw-out type soot blowing device inserts the lance pipe 1 into a combustion chamber such as a boiler or a heat exchanger, and sprays an injection medium b such as high-pressure steam or air onto the deposit a on the wall surface 19 of the combustion chamber. It is an apparatus for removing the kimono a and cleaning the surface.
[0003]
As shown in FIG. 7, the plug-type soot blowing device is installed in accordance with the opening 20 provided in the combustion chamber wall 19 in the soot blowing operation, and the lance pipe 1 is inserted from the opening 20. It is as follows.
[0004]
The rotation of the motor 5 provided on the casing 40 of the draw-out type soot blower is decelerated by the speed reducer 6, and the ball screw 3 is rotated via the gears 7, 8, 9. When the threaded screw box 4 is moved in the axial direction by the rotation of the ball screw 3, the gear 11 and the lance tube 1 rotatably connected to the screw box 4 are moved in the axial direction together with the screw box 4. Then, the lance pipe 1 is advanced into the combustion chamber through an opening 20 provided in the combustion chamber wall 19 such as a boiler or a heat exchanger. Further, the motor 5 is reversely rotated by rotating it backward. In the figure, reference numeral 21 denotes a heat transfer tube in the combustion chamber wall 19 such as a boiler or a heat exchanger.
On the other hand, it is connected to the screw box 4 so as to be rotatable and fixed to the ball screw 3 in the axial direction, and is concentrically fitted on the ball screw 3 so as to be axially slidable and over the entire axial length of the ball screw 3. The gear 10 that engages with the provided key groove through the key rotates together with the ball screw 3 while moving in the same manner as the screw box 4, the gear 11, and the lance pipe 1 move in the axial direction. The rotating gear 11 is rotated, and the lance pipe 1 connected to the gear 11 is rotated.
[0005]
The ejection medium b is supplied from the supply pipe 2 connected to the head valve 16 and having the tip side inserted through the screw box 4 and inserted into the lance pipe 1 through a seal (not shown). When the dog 17 that moves in the axial direction and is attached to the screw box 4 activates the valve opening / closing cam 12, the head valve 16 is opened via the connecting rod 13 and the levers 14, 15.
[0006]
At this time, the tip of the lance tube 1 reaches point B in the combustion chamber wall 19 shown in FIG. 7 and the injection medium b is injected from the nozzle 18. Subsequently, when the lance pipe 1 is rotated and moved forward while being jetted to reach a point C shown in FIG. 7, the reversing switch is operated to start the backward movement.
[0007]
When the tip of the lance tube 1 is retracted to the point B, the valve opening / closing cam 12 is operated in the opposite direction to the forward movement to close the head valve 16, stop the injection of the injection medium b from the nozzle 18, and continue to move backward. When returning to point A, one cycle of operation is completed.
[0008]
[Problems to be solved by the invention]
In the conventional draw-out type blower as described above, the relationship between the speed of the lance tube 1 entering and retracting and the rotational speed of the lance tube 1 is always constant by the ball screw 3. When the rotational speed is constant, that is, when the rotational speed of the lance pipe 1 is constant, the tip of the lance pipe 1 is moved at a constant moving speed both when entering the combustion chamber and during injection. For this reason, if the movement of the lance pipe 1 is increased in order to reduce the thermal influence when entering the combustion chamber, there is a problem that the moving speed at the time of injection is also increased and the effect of removing the wrinkles is lowered.
[0009]
In addition, if the moving speed at the time of injection is slowed down to increase the effect of removal, the moving speed at the time of entering the combustion chamber also slows down, and there is a problem that the nozzle 18 at the tip of the lance pipe is easily affected by heat.
[0010]
In the present invention, the lance pipe 1 moves at a high speed when entering the combustion chamber, and moves at a low speed at the time of injection, and it is an object of the present invention to provide a draw-out type soot blower that has a low heat influence on the nozzle and has a high degutting effect. It is said.
[0011]
[Means for Solving the Problems]
  (1) The present invention has been made to solve the above problems, and as a first means thereof, a lance pipe is inserted into the combustion chamber and a high-pressure injection medium is injected from the tip of the lance pipe. In the plug-type soot blower that removes deposits in the combustion chamber by means of a spiral portion formed on the outer peripheral surface,In lineA drum screw that is rotatably mounted in the same plug-and-insert type soot blower so as to be axially moved to the lance tube; An engagement member that engages with the spiral portion;The drum screw is concentrically moved axially outside a rotating shaft arranged in parallel with the lance tube, and the rotation is fixed and attached to each other, and the drum screw and the lance tube are both rotatable and axially mounted. A support member mounted with fixed movement, and the drum screw and the rotation interlocking means of the lance tube;The spiral portion is formed in two stages in which the spiral pitch is coarse and the fine portion are continuously formed in the axial direction, and the drum screw is moved in the axial direction by the engagement of the spiral portion and the engagement member with rotation. Provided is a pluggable soot blower characterized by being configured as described above.
[0012]
  According to the first means, the spiral portion of the drum screw is formed in two stages in which the spiral pitch coarse portion and the fine portion are continuously formed in the axial direction, so that the axial direction of the lance tube depends on the position of the lance tube. The moving speed can be set in two stages, and it becomes possible to change the moving speed in the axial direction of the lance tube, which is suitable for reducing the thermal effect on the nozzle in the combustion chamber and for removing the dust during injection.In addition, it is preferable to construct a draw-type soot blowing device in which it is preferable to dispose the drum screw and the lance pipe separately.
[0013]
(2) As a second means, in the draw-out type soot blower of the first means, the spiral portion has a portion close to the base portion of the lance tube as a portion having a fine helical pitch, and is close to the tip of the lance tube. Provided is a plug-and-shoot type blower characterized in that the side is a portion having a rough helical pitch.
[0014]
According to the second means, in the operation of the first means, particularly, when entering the combustion chamber, it moves at a high speed in a portion where the helical pitch of the screw thread is coarse, and at the time of injection, it moves at a low speed at a portion where the helical pitch is fine. The influence of heat on the nozzle when entering or retreating into the combustion chamber is reduced, so that the durability of the lance tube can be improved, and the effect of removing the dust during injection can be enhanced.
[0015]
(3) As a third means, in the pull-out type blow blowing device of the first means or the second means, the spiral portion is a convex thread formed in a spiral shape, and the engagement member is Provided is a plug-and-shoot type blower characterized by comprising a pair of rollers arranged so as to sandwich the screw thread and a roller support that rotatably supports the rollers.
[0016]
According to the third means, the action of the first means or the second means can be achieved by the drum screw in which the spiral portion is formed by the thread.
[0017]
(4) As a fourth means, in the draw-out type blow blowing device of the first means or the second means, the spiral portion is a concave thread groove formed in a spiral shape, and the engagement member is the same There is provided a draw-out type blower characterized by comprising a roller disposed so as to fit in a screw groove and a roller support for rotatably supporting the roller.
[0018]
According to the third means, the action of the first means or the second means can be achieved by the drum screw in which the spiral portion is formed by the thread groove.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
  The present invention based on FIG. 1 and FIG.Of the first study example studied by the present inventorA plug-and-shoot type blower will be described. Figure 1 shows the bookExamination exampleFIG. 2 is an enlarged explanatory view of a portion D in FIG. 1. In addition, the same code | symbol is attached | subjected to the same member as FIG. 7 demonstrated by the prior art, and the overlapping description is abbreviate | omitted. This is also the otherStudy examples andThe same applies to the drawings showing the embodiments.
[0024]
  BookFirst study exampleThen, a screw thread that is a spiral portion provided on the outer peripheral surface of a drum screw 23 to be described later that moves the lance tube 1 is formed at a two-stage pitch of a portion having a coarse helical pitch and a portion having a fine helical pitch. By rotating the screw 23, the moving speed of the lance tube 1 to the injection start position B point is increased, and the moving speed after starting the injection is decreased.
[0025]
As shown in FIG. 1 and FIG. 2, reference numeral 22 denotes a square shaft that is disposed in parallel with the lance pipe 1 in the casing 40 of the draw-out type soot blower and has a quadrangular rotating shaft, and both ends thereof are the casing 40. Is rotatably supported by the shaft.
[0026]
A drum screw 23 is attached to the outside of the lance tube 1 concentrically with axial movement and rotation fixed to each other, and moves the lance tube 1 forward and backward into a combustion chamber such as a boiler and a heat exchanger. A screw thread 24 is spirally formed on the surface as a spiral portion. The spiral pitch of the screw thread 24 is as follows. The fine portion of the spiral pitch is 2-4 on the base side (left side in FIG. 1) of the lance tube 1 and the spiral pitch is coarse on the tip side (right side in FIG. 1). 2-4 strips are formed.
[0027]
Reference numeral 25 denotes a pair of rollers arranged so as to sandwich the screw thread 24, which is rotatably supported by a roller support body 26 fixed to the casing 40 and constitutes an engagement member with the screw thread 24. is doing.
[0028]
31 is a sprocket on the motor 5 side, and a sprocket 31 and a sprocket 32 attached to the square shaft 22 are wound around a chain 33.
[0029]
Reference numeral 34 denotes a moving body that is fitted to the angular shaft 22 and rotates together with the angular shaft 22 so as to be movable in the axial direction.
A moving body 36 and a sprocket 37 are attached to the base of the drum screw 23 with rotation and axial movement fixed to each other, and the sprocket 37 and the sprocket 35 are wound around a chain 38.
[0030]
A support member 39 is supported on the movable body 36 while being rotatable and the axial position of the drum screw is fixed. The support member 39 engages with the movable body 34 to pivot the movable body 36 and the movable body 34 together. They are also moved together in the direction.
[0031]
A link mechanism 41 that opens and closes the head valve 16 that supplies the ejection medium b is disposed outside the casing 40, and is actuated by a valve opening and closing lever (not shown) via the connecting rod 42 and the levers 41a and 41b. The head valve 16 is opened and closed. The head valve 16 is connected to a supply pipe 2 through which a moving body 36 is inserted and a seal (not shown) is inserted into the lance pipe 1, and the ejection medium b is fed into the lance pipe 1 from the supply pipe 2. It is.
[0032]
  Book configured as aboveExamination exampleWhen the rotation of the motor 5 is decelerated by the speed reducer 6 and the angular shaft 22 is rotated via the sprocket 31, the chain 33, and the sprocket 32, The sprocket 35 fixed to the moving body 34 that rotates together with the rotation rotates the moving body 36 via the chain 38 and the sprocket 37.
[0033]
When the moving body 36 rotates, the drum screw 23 and the lance tube 1 fixed to the moving body 36 rotate, and the screw thread 24 formed on the outer surface of the drum screw 23 in a spiral shape with a rough helical pitch by this rotation. Are sandwiched and engaged by a pair of rollers 25, the drum screw 23 and the lance tube 1 move forward at a high speed according to the engagement with the screw 24 having a coarse helical pitch while rotating. 1 can be advanced at high speed to the injection start position B in a combustion chamber such as a boiler or a heat exchanger. Further, the motor 5 can be moved backward by rotating in reverse.
[0034]
On the other hand, when the drum screw 23 is moved, the moving body 34 on the square shaft 22 is engaged with the moving body 36 of the drum screw 23 by the support member 39, so that the moving body 34 slides on the square shaft 22. While moving in the axial direction together with the drum screw 23, the sprocket 35 and the sprocket 37 can always be in a position where they can be interlocked by the chain 38, and the rotation from the motor 5 is always from the angular shaft 22 to the drum screw 23. I can tell you.
[0035]
The injection medium b is supplied when the moving bodies 34 and 36 move in the axial direction and the tip of the lance pipe 1 reaches the point B, by operating the valve opening / closing lever (not shown), the connecting rod 42, the lever 41a, The head valve 16 is opened via 41b, and the ejection medium b is ejected from the nozzle 18 provided in the vicinity of the tip of the lance pipe 1 through the supply pipe 2 and the lance pipe 1.
[0036]
After the tip of the lance tube 1 reaches point B, the lance tube 1 rotates and advances while spraying the spray medium b. However, the helical pitch of the thread 24 that engages with the roller 25 becomes fine, and the drum screw 23 Since the forward moving speed of the drum screw 23 is low with respect to the rotation, the moving speed of the lance pipe 1 is also low.
[0037]
When the tip of the lance pipe 1 comes to the point C while ejecting the ejection medium b, the reversing switch is actuated to rotate in the reverse direction, and the reverse operation is started at a low speed. When the tip of the lance tube 1 is retracted to the point B, the valve opening / closing levers 41a and 41b operate in the reverse direction to the forward movement, the head valve 16 is closed, and the thread 24 of the drum screw 23 is a portion having a rough helical pitch. Engages with the roller 25, so it keeps moving backward at a high moving speed and returns to the point A, and the operation of one cycle is completed.
[0038]
  Book as aboveExamination exampleAccording to the present invention, the spiral pitch of the screw thread 24, which is the spiral portion of the drum screw 23 for moving the lance tube 1, is formed at a two-stage pitch, and when entering the combustion chamber (point A) (From point B to point B), the screw 24 moves at a high speed in the portion where the helical pitch is coarse, and at the time of injection (between points B and C), it moves at a low speed in the portion where the helical pitch is fine (retracted). This also applies to the time), and the influence of heat on the nozzle when entering or retreating from the combustion chamber is reduced, so that the durability of the lance pipe 1 can be improved and the effect of removing the dust during injection can be enhanced.
[0039]
  BookExamination exampleIs on implementation, DeIt is suitable when it is preferable to arrange the ram screw 23 concentrically with the lance pipe 1.
[0040]
  Also,BookExamination exampleIs suitable when the spiral part of the drum screw 23 is preferably formed by the thread 24 in design.
[0041]
  The present invention based on FIG. 3 and FIG.Of the second example studied by the present inventorA plug-and-shoot type blower will be described. Figure 3 shows the bookExamination exampleFIG. 4 is an enlarged explanatory view of the drum screw 54 in FIG.
[0042]
  Second study exampleIsFirst study exampleThe screw shape of the spiral portion is changed with respect to the drum screw 23 ofFirst study exampleSo what was the convex thread 24, thisExamination exampleThen, it is a concave thread groove 54.First study exampleIt is the same.
[0043]
3 and 4, 53 is a drum screw that is attached to the outside of the lance tube 1 and advances and retracts the lance tube 1 into a combustion chamber such as a boiler or a heat exchanger. A concave thread groove 54 is formed in a spiral shape. The spiral pitch of the thread groove 54 is such that a portion with a fine spiral pitch is 2 to 4 on the base side of the lance tube 1 and a portion with a rough spiral pitch is on the tip side. 2 to 4 strips are formed.
[0044]
55 is a frustoconical roller disposed so as to be fitted in the screw groove 54, and can be freely rotated by a bearing 57 of a roller support 56 fixed to the casing 40 of the plug-in type blower. It is supported and forms an engagement member with the thread groove 54.
[0045]
  Book configured as aboveExamination example, The rotation from the motor 5 is sprocket 31, chain 33, sprocket 32, square shaft 22, moving body 34, sprocket 35, chain 38, sprocket 37, moving body. The drum screw 53 and the lance tube 1 which are transmitted through the motor 36 and fixed to the moving body 36 rotate.
[0046]
When the drum screw 53 is rotated, a roller 55 is rotatably fitted and engaged with a screw groove 54 formed in a spiral shape on the drum screw 53. Since the screw 53 and the lance tube 1 move at high speed while rotating, the lance tube 1 can be advanced at a high moving speed to the injection start position B in the combustion chamber such as a boiler or a heat exchanger. Further, the motor 5 can be moved backward at a high speed by rotating the motor 5 in the reverse direction.
[0047]
Further, between the injection start position B and the point C, the roller 55 comes into engagement with the groove 54 with a fine helical pitch, so that the moving speed of the lance pipe 1 is low.
[0048]
  Book as aboveExamination exampleAccording to the above, the spiral pitch of the concave thread groove 54 of the drum screw 53 for moving the lance tube 1 is formed in two stages, and the spiral is formed when entering the combustion chamber (between points A and B). Since it moved at high speed in the rough part of the pitch and moved at low speed in the fine part of the helical pitch at the time of injection (between points B and C),First study exampleSimilarly to the above, the thermal influence on the nozzle when entering the combustion chamber is reduced, the durability of the lance tube can be improved, and the effect of removing the lance tube can be enhanced.
[0049]
  BookExamination exampleIn practice, it is preferable that the spiral portion of the drum screw 53 is formed by the screw groove 54, and it is suitable when the drum screw 53 is preferably arranged concentrically with the lance pipe 1.
[0050]
  The implementation of the present invention based on FIG.1The plug type blower according to the embodiment will be described. FIG. 5 is a side cross-sectional view of the plug-in type soot blower of the present embodiment.
[0051]
  As shown in FIG. 5, the draw-out type soot blower of the present embodimentSecond study exampleThe drum screw 63 similar to the above is fixed to the outside of the angular shaft 22 which is a rotating shaft arranged in parallel with the lance tube, and the rotation is fixed to each other so that the axial movement can be freely fitted. It is configured to move in the axial direction.
[0052]
  On the outer peripheral surface of the drum screw 63, the above-mentionedSecond study exampleAs in the case of the drum screw 53, a concave screw groove 54 is formed in a spiral shape as a spiral portion, and the spiral pitch of the screw groove 54 is 2 on the side close to the base portion of the lance tube 1. There are 2 to 4 strips with a coarse helical pitch on the side close to the tip. The thread groove 54 is engaged with a roller 55 rotatably attached to the casing 40 of the plug-and-shoot type blower, and the drum screw 63 moves in the axial direction by the rotation of the drum screw 63.
[0053]
  In FIG. 5, the motor 5, the speed reducer 6, the sprocket 31 attached to the output shaft of the speed reducer 6, the chain 33, the sprocket 32 attached to the square shaft 22, etc. are arranged on the combustion chamber wall 19 side. Has been. But these areSecond study exampleSimilarly to the arrangement of FIG. 3, it may be arranged on the side far from the combustion chamber wall 19.
[0054]
Reference numeral 64 denotes a movable body that is fitted to the square shaft 22 and is movable in the axial direction, and is fixed to the base portion of the drum screw 63 together with the sprocket 65 while being fixed in both axial movement and rotation.
[0055]
A moving body 66 is fixed to the base portion of the lance pipe 1 in both the axial direction and the rotational direction, and is attached together with the sprocket 67.
[0056]
The sprocket 67 and the sprocket 65 attached to the square shaft 22 are wound by a chain 68 and constitute a rotation interlocking means between the drum screw 63 and the lance pipe 1.
[0057]
The distal end side of the supply pipe 2 is inserted into the lance pipe 1 through a moving body 66 and a seal (not shown).
[0058]
Reference numeral 69 denotes a support member that is inserted through the movable body 64 connected to the drum screw 63 and the movable body 66 connected to the lance tube 1 together, and is rotatably attached and fixed in the axial direction. The moving body 64 and the moving body 66 are connected so that the axial positional relationship between the moving body 64 and the moving body 66 is constant, and the lance pipe 1 is similarly moved in the axial direction as the drum screw 63 moves in the axial direction.
[0059]
  For configurations other than the above,Second study exampleIs substantially the same.
[0060]
In the draw-out type blow blowing device of the present embodiment configured as described above, the rotation from the motor 5 is transmitted through the speed reducer 6, the sprocket 31, the chain 33, the sprocket 32, and the square shaft 22. The movable body 64 and the drum screw 63, which are transmitted and fitted to the angular shaft 22 so as to be slidable in the axial direction, rotate, and a roller is formed in the concave screw groove 54 formed in a spiral along with the rotation. Since 55 is rotatably fitted and engaged, the drum screw 63 and the moving body 64 move forward while rotating, and the lance pipe 1 is moved via the support member 69 and the moving body 66 along with this movement. It can be advanced at high speed to the injection start position B in the combustion chamber such as a heat exchanger.
[0061]
At that time, the sprocket 65 connected to the drum screw 63 attached to the square shaft 22 and the sprocket 67 connected to the base of the lance pipe 1 are rotated together by the chain 68, so that the lance pipe 1 is connected to the drum screw. Rotates in conjunction with -63.
[0062]
  In addition, this embodiment is the aboveSecond study exampleFor example, the lance pipe 1 is moved at a high speed to the injection start position B in the combustion chamber of a boiler, a heat exchanger or the like by the helical pitch of the screw groove 54 forming the helical part of the drum screw 63. Since the moving speed of the lance pipe 1 is low in the range from the injection start position B to the point C, even in the plug-in type soot blower of the present embodiment,Second study exampleIt is possible to obtain the same effect as that of the above-described draw-out type soot blower.
[0063]
In this embodiment, it is preferable to form the spiral portion of the drum screw 53 with the thread groove 54 in practice, and it is suitable when it is preferable to dispose the drum screw 53 separately from the lance pipe 1.
[0064]
  Based on FIG.2The plug type blower according to the embodiment will be described. FIG. 6 is a side cross-sectional view of the plug-in type soot blower of the present embodiment.
[0065]
  The pluggable soot blower of the present embodiment is the first embodiment shown in FIG.1In this embodiment, the screw shape of the spiral portion of the drum screw is changed, and instead of the concave screw groove 54, in this embodiment, a convex thread 24 is formed as shown in FIG. It is a thing. Other configurations are implementedFirst form ofIt is the same.
[0066]
  In FIG. 6, reference numeral 73 denotes a drum screw that is fitted to the outside of the square shaft 22 so as to be rotationally fixed and axially movable. The mounting method for the square shaft 22, the structure of the moving body 64, the sprocket 65, etc. First1It is the same as the form.
[0067]
  Also, the outer peripheral surface of the drum screw 73 is shown in FIGS.First study exampleAs in the drum screw 23, a screw thread 24 is provided as a spiral portion, and the screw thread 24 has a spiral pitch of 2 to 4 fine portions on the side closer to the base portion of the lance tube 1. In the side close to the tip, 2 to 4 strips with a rough helical pitch are formed. The thread 24 is engaged with a pair of rollers 25 rotatably attached to the casing 40 of the plug-and-shoot type blower as an engaging member, and the drum screw 73 is moved in the axial direction by the rotation of the drum screw 73. Moving.
[0068]
  For the configuration other than the above,1It is the same as the form.
[0069]
  In the draw-out type soot blower of the present embodiment configured as described above, the rotation from the motor 5 is the first of the implementation.1The movable body 64 and the drum screw 73 that are transmitted to the square shaft 22 and slidably fitted to the square shaft 22 rotate in the same manner as the form, and the convex shape formed in a spiral shape with this rotation. Since the pair of rollers 25 that are engaging members are rotatably sandwiched between the screw threads 24, the drum screw 73 and the moving body 64 move forward while rotating, and the support member 69 is moved along with this movement. The lance pipe 1 can be moved at high speed through the moving body 66 to the injection start position B in the combustion chamber such as a heat exchanger.
[0070]
  With respect to the others, the plug-in type blow blowing device of the present embodiment is the same as the above-described first embodiment.1It functions in the same manner as the plug-and-shoot type blower of the form and can exhibit the same operational effects.
[0071]
In the present embodiment, it is preferable to form the spiral portion of the drum screw 73 with the screw thread 24 in practice, and it is suitable when the drum screw 73 is preferably arranged separately from the lance pipe 1.
[0072]
The embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment, and it goes without saying that various modifications may be made to the specific structure and configuration within the scope of the present invention. .
[0073]
【The invention's effect】
  (1) According to the invention of claim 1, the plug-type soot blowing device removes deposits in the combustion chamber by inserting a lance pipe into the combustion chamber and injecting a high-pressure injection medium from the tip of the lance pipe. In the plug-and-shoot type blower, the spiral part is formed on the outer peripheral surface and the lance pipe is flat.In lineA drum screw that is rotatably mounted in the same plug-and-insert type soot blower so as to be axially moved to the lance tube; An engaging member that engages with the spiral portion;The drum screw is concentrically moved axially outside a rotating shaft arranged in parallel with the lance tube, and the rotation is fixed and attached to each other, and the drum screw and the lance tube are both rotatable and axially mounted. A support member mounted with fixed movement, and the drum screw and the rotation interlocking means of the lance tube;The spiral portion is formed in two stages in which the spiral pitch is coarse and the fine portion are continuously formed in the axial direction, and the drum screw is moved in the axial direction by the engagement of the spiral portion and the engagement member with rotation. Since the helical part of the drum screw is formed in two stages in the axial direction with a coarse helical pitch and a fine part, the helical part of the drum screw is formed in two stages depending on the position of the lance pipe. The direction moving speed can be set in two stages, and the axial moving speed of the lance pipe can be changed to reduce the thermal influence on the nozzle in the combustion chamber and to be suitable for the effect of removing the dust during injection.In addition, it is possible to construct a draw-out type soot blowing device that preferably arranges the drum screw and the lance pipe separately.
[0074]
(2) According to a second aspect of the present invention, in the draw-out type blow blowing device according to the first aspect, the spiral portion has a portion close to the base portion of the lance tube as a portion having a small helical pitch, and the lance tube In the effect of the invention of claim 1, particularly when entering the combustion chamber, the side close to the tip of the screw moves at a high speed in the portion where the helical pitch is rough, Because it moves at a low speed with a fine spiral pitch during injection, the influence of heat on the nozzle when entering and retreating into the combustion chamber is reduced, improving the durability of the lance tube and enhancing the degumming effect during injection Can do.
[0075]
(3) According to a third aspect of the present invention, in the draw-out type blow blowing device according to the first or second aspect, the spiral portion is a convex thread formed in a spiral shape. The combined member is configured to be a pair of rollers disposed so as to sandwich the screw thread and a roller support body that rotatably supports the roller. The effect of the invention can be achieved with a drum screw in which a spiral portion is formed by a screw thread.
[0076]
(4) According to a fourth aspect of the present invention, in the draw-out type blow blowing device according to the first or second aspect, the spiral portion is a concave thread groove formed in a spiral shape, and the engagement Since the member is configured to be a roller support that rotatably supports the roller and the roller disposed so as to fit in the thread groove, the invention according to claim 1 or claim 2 This effect can be achieved with a drum screw in which a spiral portion is formed by a thread groove.
[Brief description of the drawings]
FIG. 1 shows the present invention.Of the first study example studied by the present inventorIt is explanatory drawing of a plug-in type soot blowing apparatus, and is side surface sectional drawing of a plug-in type soot blowing apparatus.
FIG. 2 is an enlarged explanatory view of a portion D in FIG.
FIG. 3Of the second example studied by the present inventorIt is explanatory drawing of a plug-in type soot blowing apparatus, and is side surface sectional drawing of a plug-in type soot blowing apparatus.
4 is an enlarged explanatory view of the drum screw in FIG. 3. FIG.
FIG. 5 shows the first embodiment of the present invention.1It is explanatory drawing of the plug-in type soot blowing apparatus concerning a form, and is side surface sectional drawing of a plug-in type soot blowing apparatus.
FIG. 6 shows the first embodiment of the present invention.2It is explanatory drawing of the plug-in type soot blowing apparatus concerning a form, and is side surface sectional drawing of a plug-in type soot blowing apparatus.
FIG. 7 is an explanatory view of an example of a conventional plug-type soot blowing device, and is a side sectional view of the plug-in type soot blowing device.
[Explanation of symbols]
1 Lance tube
2 Supply pipe
5 Motor
6 Reducer
18 nozzles
19 Combustion chamber wall
20 opening
21 Heat transfer tube
22 square shaft
23 Drum screw
24 Screw thread
25 Laura
26 Roller support
31 sprocket
32 sprocket
33 chain
34 Mobile
35 sprocket
36 Mobile
37 Sprocket
38 chain
39 Support material
40 casing
41 Link mechanism
41a, 41b lever
42 Connecting rod
53 Drum Screw
54 Thread groove
55 Laura
56 Roller support
57 Bearing
63 drum screw
64 mobile
65 sprocket
66 Mobile
67 Sprocket
68 chain
69 Support material
73 Drum Screw

Claims (4)

In a pluggable soot blower that removes deposits in a combustion chamber by inserting a lance tube into the combustion chamber and injecting a high-pressure injection medium from the tip of the lance tube, a spiral portion is formed on the outer peripheral surface of the lance tube. When the drum screws provided mounted to perform both rotatably and axial movement to said lance tube to a flat row in the tuning slide type Susu吹the apparatus, is fixed to the tuning slide type Susu吹the apparatus An engagement member that engages with the spiral portion of the drum screw, the drum screw being concentrically movable axially outside a rotation shaft arranged in parallel with the lance tube, and the rotations being fixed to each other. with mounted, comprising a support member fixedly attached together rotatably and axially moved in the same drum screw and the lance tube, and a rotation interlock means of the same drum screw and the lance tube, the screw The part is formed in two stages in which the coarse part and the fine part of the spiral pitch are continuously formed in the axial direction, and the drum screw is configured to move in the axial direction by the engagement of the helical part and the engaging member with rotation. A plug-and-shoot type blower characterized by being made.   2. The draw-out type blow blowing device according to claim 1, wherein the spiral portion has a portion closer to the base of the lance tube as a portion with a finer helical pitch, and a portion closer to the tip of the lance tube with a portion with a larger helical pitch. A pluggable soot blower characterized by comprising:   3. The draw-out type soot blower according to claim 1 or 2, wherein the spiral portion is a convex thread formed in a spiral shape, and the engaging member is disposed so as to sandwich the thread. And a pair of rollers, and a roller support for rotatably supporting the same roller. 3. The draw-out type soot blowing apparatus according to claim 1 or 2, wherein the spiral portion is a concave thread groove formed in a spiral shape, and the engagement member is disposed so as to fit into the screw groove. And a roller support body for rotatably supporting the roller .

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