JPH07180827A - Soot blower - Google Patents

Abstract

PURPOSE:To ensure an efficient injection of injection medium and prevent the injection medium from causing an accidental fire. CONSTITUTION:This soot blower comprises a main body 2, an inner tube 3, a lance tube 4, a travelling head 5, a nozzle 6, a feed screw 7, a motor 8, a screw bushing 9 and an automatic reversing device 10 in particular, for converting the rotation of the feed screw 7 into a repeating rotation of the lance tube 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a soot blower which is applied to a combustion chamber of a boiler, a furnace or the like or a heat exchanger for flue gas to remove soot and ash dust adhering to a water pipe group.

[0002]

2. Description of the Related Art Conventionally, as a soot blower of this type,
For example, the one described in JP-A-1-184318 and shown in FIG. 15 is known. The soot blower 100
Basically, a main body 101, an inner tube 102 provided on the main body 101, a lance tube 103 rotatably and rotatably provided on the main body 101, and a lance tube 103 movably provided on the main body 101. A traveling head 104 for rotatably supporting the lance tube 10
3, a nozzle 105 provided on the main body 101, a feed screw 106 rotatably provided on the main body 101, a motor 107 provided on the main body 101 to rotate the feed screw 106, and a feed screw 106 provided on the traveling head 104. Screw bush 108 to be screwed
And the rotation of the feed screw 106 to the lance tube 1
And a rotation transmission device 109 that transmits the signal to the transmission device 03. The rotation transmission device 109 includes the feed screw 106.
Key groove 110 provided on the
A pinion gear 111 rotatably mounted on the traveling head 104 so as not to move back and forth, a slide key 112 provided on the pinion gear 111 slidably engaged with a key groove 110, and a pinion gear mounted on the lance tube 103. It comprises a large gear 113 meshing with 111. Thus, such a thing, when the motor is rotated,
The feed screw is rotated, and the traveling head and the lance tube are moved back and forth by a screw bush screwed with the feed screw. At the same time, the pinion gear is rotated by the key groove and the slide key of the rotation transmission device, the large gear meshing with this is rotated, and the lance tube is rotated. Therefore, the nozzle is rotated 360 degrees while moving back and forth and moved in a so-called spiral shape. The jet medium is jetted from the nozzle thus moving through the inner tube and the lance tube. However, in such a case, the injection medium is
Since the fuel was injected over 60 degrees, there was a lot of waste, and in the case of a coal-fired boiler or the like, there was a risk that the fuel would be injected downward even with the burner, causing a misfire.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and was devised to solve the problem. The object of the present invention is to efficiently eject an ejection medium and , To provide sootblowers that do not cause misfires.

[0004]

The sootblower of the present invention basically comprises a main body, an inner tube provided on the main body, a lance tube provided on the inner tube so as to be movable back and forth, and a main body. A traveling head rotatably supported to rotatably support the lance tube, a nozzle provided to the lance tube, a feed screw rotatably provided to the main body, and a feed screw provided to the main body to rotate the feed screw. It is characterized by a motor, a screw bush provided on the traveling head and screwed into the feed screw, and an automatic reversing device for converting the rotation of the feed screw into the repeated rotation of the lance tube.

[0005]

When the motor is rotated, the feed screw is rotated, and the traveling head and the lance tube are moved back and forth by the screw bush screwed with the feed screw. At the same time, the rotation of the feed screw is converted into the repeated rotation of the lance tube by the automatic reversing device. Therefore, the nozzle is repeatedly rotated over a predetermined angular range while moving back and forth. The jet medium is jetted from the nozzle thus moving through the inner tube and the lance tube.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a sootblower according to a first embodiment of the present invention. FIG. 2 is a vertical cross-sectional side view showing a main part of FIG. 1. FIG. 3 is a vertical sectional front view of FIG. 2. FIG. 4 is a cross-sectional plan view of FIG. The sootblower 1 is mainly composed of a main body 2, an inner tube 3, a lance tube 4, a traveling head 5, a nozzle 6, a feed screw 7, a motor 8, a screw bush 9, and an automatic reversing device 10. The main body 2 forms a basic part of the sootblower 1, and in this example, is composed of a channel material 11 and front and rear plates 12 provided in front of and behind this (the left side in FIG. 1 and FIG. 2 is the front side). It is installed outside the furnace wall (not shown).
The inner tube 3 is provided on the main body 2, and in this example, has a pipe shape with both ends open, and the rear side is the rear plate 1.
It is fixed by penetrating to 2, and the front side extends to the vicinity of the front plate 12. The rear end of the inner tube 3 has a head valve 13
Source of jetting medium such as steam or air (not shown)
Are connected. The lance tube 4 is provided on the inner tube 3 so as to be movable back and forth and rotatable, and in this example, has a pipe shape in which a rear end is open and a front end is closed,
A stuffing box 14 is provided on the rear side, and these are externally fitted to the inner tube 3 so as to be able to move back and forth and rotate. A gland packing 15 is provided between the stuffing box 14 and the inner tube 3, and the front side has a front plate 12. Is rotatably and rotatably supported by the guide roller 16 and is inserted into the furnace through a through hole formed in the furnace wall. The traveling head 5 is provided in the main body 2 so as to be movable back and forth and rotatably supports the lance tube 4. In this example, the left and right rollers that are rotatable around the horizontal axis and roll along the channel member 11 are provided. 17, a base plate 18 on the rear side, a cap plate 19 spaced apart from the front side of the base plate 18, an appropriate number of stay bolts 20 connecting these, and a cover 21 covering the lower half of these, and a feed The screw 7 is loosely fitted and the stuffing box 14 is rotatably supported.
The nozzle 6 is provided on the lance tube 4, and in this example, only one nozzle 6 is provided on the front upper part of the lance tube 4. The feed screw 7 is rotatably provided on the main body 2. In this example, the feed screw 7 includes a male screw, and both sides are rotatably supported by the front and rear plates 12. Motor 8
Is provided on the main body 2 and rotates the feed screw 7. In this example, the feed screw 7 is an electric motor (geared motor) and is provided on the upper rear side of the channel member 11 and via the gear mechanism 22. Is designed to rotate. The gear mechanism 22 includes a motor gear 23 wedged to the output shaft of the motor 8, an idle gear 24 meshed with the motor gear 23, a gear 25 meshed with the idle gear 24 to the feed screw 7, and a rear plate 12. A support shaft 26 that is rotatably and rotatably provided and has an idle gear 24 wedged to the front side.
And a handle 2 which is detachably fitted to the rear side of the handle 2.
7, the support shaft 26 is moved backward to engage the idle gear 24 only with the gear 25, and the handle 27 attached to the support shaft 26 is turned to manually rotate the feed screw 7.
Can be rotated. The screw bush 9
The feed screw 7 is provided on the traveling head 5.
In this example, a female screw that is screwed to the male screw of the feed screw 7 is provided, and
It is fixed to. The automatic reversing device 10 converts the rotation of the feed screw 7 into the repetitive rotation of the lance tube 4. In this example, the gear mechanism 28 for extracting the rotation of the feed screw 7 and the rotational movement of the gear mechanism 28 are converted into a linear reciprocating movement. Cam mechanism 29 and a rack and pinion mechanism 3 for converting linear reciprocating motion of the cam mechanism 29 into repetitive rotation of the lance tube 4.
It consists of 0's. The gear mechanism 28 includes a key groove 31 provided on the feed screw 7, a pinion gear 32 rotatably provided on the feed screw 7 and supported by the traveling head 5 so as not to move forward and backward, and a key groove 31 provided on the pinion gear 32. A slide key 33 slidably engaged with the
A two-stage gear 34 that is rotatably provided in the stuffing box 14 and has a large-diameter gear that meshes with the pinion gear 32;
It comprises a lower gear 35 that is rotatably provided on the traveling head 5 and that meshes with a small diameter gear of the two-stage gear 34. The cam mechanism 29 is provided in the traveling head 5 so as to be able to move up and down, and has an L-shaped lifting body 36, and a lower gear 35.
It comprises a cam roller 37 rotatably provided on the circumference of the circle, and a cam groove 38 cut on the horizontal piece of the elevating body 36 and engaged with the cam roller 37. The rack and pinion mechanism 30 includes a rack 39 formed on a vertical piece of the lifting body 36.
And the stuffing box 14 is wedged to rack 3
And a pinion 40 with which 9 is meshed. next,
The operation will be described based on such a configuration. When the motor 8 is rotated, the feed screw 7 is rotated through the motor gear 23, the idle gear 24, and the gear 25 of the gear mechanism 22, and the traveling head 5 and the lance tube 4 are moved back and forth by the screw bush 9 screwed onto the feed screw 7. Be moved.
At the same time, the rotation of the feed screw 7 is taken out by the gear mechanism 28 of the automatic reversing device 10, the taken-out rotational movement is converted into the linear reciprocating movement by the cam mechanism 29, and the converted linear reciprocating movement is carried out by the rack and pinion mechanism. It is converted into repeated rotation of the lance tube 4 depending on 30. Therefore, the nozzle 6 moves upwards and backwards toward a predetermined angle range (1
It is rotated repeatedly for 80 to 220 degrees. A jet medium such as steam or air is jetted from the nozzle 6 which moves in this way through the head valve 13, the inner tube 3, and the lance tube 4.

Next, a second embodiment of the present invention will be described with reference to FIGS.
It will be described based on. The second embodiment is an automatic reversing device 10
The forward rotation gear mechanism 4 for extracting the forward rotation of the feed screw 7
1, a reverse rotation gear mechanism 42 for extracting the reverse rotation of the feed screw 7, and an oscillator 4 provided on the lance tube 4.
3, a switching mechanism 44 provided on the switching mechanism 44 for switching between a forward rotation transmission position and a reverse rotation transmission position, and a forward rotation transmission position of the switching mechanism 44 provided between the forward rotation gear mechanism 41 and the switching mechanism 44. It is provided between the forward rotation engagement mechanism 45 that engages and transmits the forward rotation from the forward rotation gear mechanism 41 to the oscillator 43, and the reverse rotation gear mechanism 42 and the switching mechanism 44. It is different from the first embodiment in that it is constituted by a reverse rotation engagement mechanism 46 that engages and transmits the reverse rotation from the reverse rotation gear mechanism 42 to the oscillator 43. The forward rotation gear mechanism 41 is provided with a key groove 47 provided in the feed screw 7 and a rotatably provided in the feed screw 7 and is supported by the traveling head 5 so as not to move forward and backward (right side in FIGS. 5 to 7). Is provided on the front side), a dual pinion gear 48, a slide key 49 provided on the dual pinion gear 48 slidably engaged with the key groove 47, and a stuffing box 14 rotatably provided on the front of the dual pinion gear 48. The forward rotation gear 50 meshes with the partial gear. The reverse rotation gear mechanism 42 is provided with the dual pinion gear 48, an idle gear 51 that is rotatably provided on the traveling head 5 by meshing with a rear gear thereof, and rotatably provided on the stuffing box 14 by meshing with the idle gear 51. It consists of a forward rotation gear 50 and a reverse rotation gear 52 that rotates in the opposite direction at the same speed. The oscillator 43 has a disc shape, is arranged between the forward rotation gear 50 and the reverse rotation gear 52, and is wedged to the stuffing box 14. The switching mechanism 44 is fixed to the shaft 53 penetrating the circumference of the oscillator 43, disk-shaped changes 54 fixed to both ends of the shaft 53, a lever 55 protrudingly provided on the circumference of the shaft 53, and the traveling head 5. Left and right square pins 5 to which the lever 55 is fitted
6, a ball plunger 57 which is screwed to the oscillator 43 and has a spring and a ball built therein, and a recess which is recessed in the shaft 53 so that the change 54 can be transmitted by the ball plunger 57 to the first forward rotation transmission position (FIG. 8, FIG. 11, FIG. 13), a second forward rotation transmission position (see FIG. 14), a first reverse rotation transmission position (see FIGS. 9 and 10), and a second reverse rotation transmission position (see FIG. 12). (Not shown) and. The forward rotation engaging mechanism 45 is provided in the forward rotation kick pin 58 provided on the circumference of the forward rotation gear 50, and is provided in the front change 54 so as to abut with the forward rotation kick pin 58 when it is in the first forward rotation transmission position. It consists of a single forward rotation transmission pin 59 and a second forward rotation transmission pin 60 which is provided on the front change 54 and which abuts the forward rotation kick pin 58 when it is in the second forward rotation transmission position. The reverse rotation engagement mechanism 46 is provided on the circumference of the reverse rotation gear 52, and the first reverse rotation transmission pin that is provided on the rear change 54 and abuts on the reverse rotation kick pin 61 when this is the first reverse rotation transmission position. 62 and the second reverse rotation transmission pin 6 provided on the rear side change 54 and abutting against the reverse rotation kick pin 61 when this is at the second reverse rotation transmission position.
It consists of three and three. When the feed screw 7 rotates, the double pinion gear 48 is rotated by the key groove 47 and the slide key 49, the forward gear 50 is rotated by the front gear of the feed screw 7, and the double pinion gear 48 is rotated. Reverse gear 5 depending on the rear gear and idle gear 51
2 is rotated in the opposite direction with respect to the forward rotation gear 50 at the same speed.
In FIG. 8, when the change 54 is at the first forward rotation transmission position, the forward rotation gear 50 is rotated clockwise, the forward rotation kick pin 58 is engaged with the first forward rotation transmission pin 59, and the oscillator 43 is rotated clockwise. It shows the state of rotating. When the oscillator 43 continues to rotate in the clockwise direction, the reverse rotation kick pin 61 intersects the normal rotation kick pin 58 at the lower position, but passes between the first reverse rotation transmission pin 62 and the second reverse rotation transmission pin 63. When the oscillator 43 continues to rotate further and the lever 55 engages with the square pin 56 on the left side in the drawing as shown in FIG. 9, the change 54 is rotated counterclockwise to the first reverse rotation transmission position and the forward rotation kick pin. 58 is disengaged from the first forward rotation transmission pin 59 and the rotation of the oscillator 43 is stopped. In this state, since the first reverse rotation transmission pin 62 is on the trajectory of the reverse rotation kick pin 61, the oscillator 43 is rotated counterclockwise in contact with the rotating reverse rotation kick pin 61 (see FIG. 10). When the oscillator 43 continues to rotate counterclockwise, the normal rotation kick pin 58 intersects the reverse rotation kick pin 61 at the lower position, but the first normal rotation transmission pin 59
And the second normal rotation transmission pin 60. The oscillator 43 continues to rotate, and as shown in FIG.
When 5 is engaged with the square pin 56 on the right side of the drawing, the change 54 is rotated clockwise to the first forward rotation transmission position, the reverse rotation kick pin 61 is disengaged from the first reverse rotation transmission pin 62, and the rotation of the oscillator 43 is prevented. Be stopped. In this state, since the first forward rotation transmission pin 59 is on the locus of the forward rotation kick pin 58, the oscillator 43 is rotated clockwise in abutment with the rotating forward rotation kick pin 58, and the state of FIG. Return to. In this way, the oscillator 43, the stuffing box 14, and the lance tube 4 advance by repeating repeated rotations. At the forward end, the motor 8 is rotated in the reverse direction to move in the reverse direction. At this time, the forward rotation gear 50 and the reverse rotation gear 52 also rotate in the opposite direction to the rotation direction during the forward movement.
As shown in FIG. 8, when the oscillator 43 is rotating in the clockwise direction and is switched to the reverse direction, the forward rotation kick pin 58 reverses and separates from the first forward rotation transmission pin 59, and rotates one rotation idly to rotate the first forward rotation. The oscillator 43 is rotated counterclockwise by engaging with the opposite side of the transmission pin 59. When the oscillator 43 continues to rotate in the counterclockwise direction, as shown in FIG. 12, the lever 55 engages with the square pin 56 on the right side in the figure, the change 54 is rotated clockwise, and the second reverse transmission position is reached. The forward rotation kick pin 58 is disengaged from the first forward rotation transmission pin 59, and the rotation of the oscillator 43 is stopped. In this state, since the second reverse rotation transmission pin 63 is on the locus of the reverse rotation kick pin 61, the oscillator 43 is rotated clockwise in contact with the rotating reverse rotation kick pin 61. When the oscillator 43 continues to rotate in the clockwise direction, the normal rotation kick pin 58 intersects the reverse rotation kick pin 61 at the lower position, but passes through the side of the first normal rotation transmission pin 59. Oscillator 4
3 continues to rotate, and as shown in FIG. 13, when the lever 55 engages with the square pin 56 on the left side of the drawing, the change 5
4 is rotated counterclockwise to the first forward rotation transmission position,
The reverse rotation kick pin 61 is disengaged from the second reverse rotation transmission pin 63, and the rotation of the oscillator 43 is stopped. In this state,
Since the first forward rotation transmission pin 59 is on the locus of the forward rotation kick pin 58, the oscillator 43 is rotated counterclockwise in abutment with the rotating forward rotation kick pin 58. When the oscillator 43 continues to rotate in the counterclockwise direction, the reverse rotation kick pin 61 intersects the normal rotation kick pin 58 at the lower position, but passes between the first reverse rotation transmission pin 62 and the second reverse rotation transmission pin 63. The oscillator 43 is moved backward by repeating such repetitive rotation, and the motor 8 is stopped at the reverse end. Figure 1
As indicated by 0, when the oscillator 43 is rotating in the counterclockwise direction and is switched to the reverse direction, the reverse rotation kick pin 61 reverses and separates from the first reverse rotation transmission pin 62, and makes one rotation idle to rotate the first reverse rotation transmission pin 62. The oscillator 43 is rotated in the clockwise direction by engaging with the opposite side. When the oscillator 43 continues to rotate in the clockwise direction, as shown in FIG.
5 changes to square pin 56 on the right side of the figure and change 5
4 is rotated counterclockwise to the second forward rotation transmission position,
The reverse rotation kick pin 61 is disengaged from the first reverse rotation transmission pin 62 and the rotation of the oscillator 43 is stopped. In this state,
Since the second forward rotation transmission pin 60 is on the locus of the forward rotation kick pin 58, the oscillator 43 is rotated counterclockwise in abutment with the rotating forward rotation kick pin 58. Like this
The oscillator 43 is moved forward and backward while repeatedly rotating, and the stuffing box 14 and the lance tube 4 provided on the oscillator 43 are also moved in the same manner, and the injection medium is supplied from the nozzle 6 provided at the tip of the lance tube 4 to a required angle (180 to 180). Two
It is possible to inject only 20 degrees.

The required angle at which the lance tube 4 is repeatedly rotated was 180 to 220 degrees in the previous embodiment, but the angle is not limited to this and may be another angle, for example. The ejection direction of the ejection medium from the nozzle 6 is
Although it is directed upward, the invention is not limited to this, and it may be directed downward or sideways, for example. The automatic reversing device 10 is not limited to the above-described embodiment and may have another structure.

[0009]

As described above, according to the present invention,
The following excellent effects can be achieved. (1) Main body, inner tube, lance tube, traveling head, nozzle, feed screw, motor,
It is composed of a screw bush and an automatic reversing device, and in particular, an automatic reversing device that converts the rotation of the feed screw into the repetitive rotation of the lance tube is provided, which enables efficient injection of the injection medium and causes misfire. It never happens. (2) Since the automatic reversing device for converting the rotation of the feed screw into the repetitive rotation of the lance tube is provided so as to utilize the rotation of the feed screw, a drive source dedicated to the automatic reversing device is unnecessary, which is rational.

[Brief description of drawings]

FIG. 1 is a side view showing a sootblower according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view showing a main part of FIG.

FIG. 3 is a vertical sectional front view of FIG.

4 is a cross-sectional plan view of FIG.

FIG. 5 is a side view of essential parts showing a second embodiment of the present invention.

6 is a vertical side view of FIG.

7 is a cross-sectional plan view of FIG.

FIG. 8 is a front view for explaining the operation.

FIG. 9 is a view similar to FIG.

FIG. 10 is a view similar to FIG.

FIG. 11 is a view similar to FIG.

FIG. 12 is a view similar to FIG.

FIG. 13 is a view similar to FIG.

FIG. 14 is a view similar to FIG.

FIG. 15 is a side view showing a conventional sootblower.

[Explanation of symbols]

1 ... Soot blower, 2 ... Main body, 3 ... Inner tube, 4
... Lance tube, 5 ... Traveling head, 6 ... Nozzle, 7 ... Feed screw, 8 ... Motor, 9 ... Screw bush, 10 ... Automatic reversing device, 11 ... Channel material,
12 ... Front and rear plates, 13 ... Head valve, 14 ... Stuffing box, 15 ... Gland packing, 16 ... Guide roller, 17 ... Roller, 18 ... Base plate, 19 ... Cap plate, 20 ... Stay bolt, 21 ... Cover,
22 ... Gear mechanism, 23 ... Motor gear, 24 ... Idle gear, 25 ... Gear, 26 ... Spindle, 27 ... Handle, 28 ...
Gear mechanism, 29 ... Cam mechanism, 30 ... Rack and pinion mechanism, 31 ... Key groove, 32 ... Pinion gear, 33 ... Slide key, 34 ... Two-stage gear, 35 ... Lower gear, 36 ... Elevating body, 37 ... Cam roller, 38 … Cam groove, 39… Rack,
40 ... Pinion, 41 ... Forward rotation gear mechanism, 42 ... Reverse rotation gear mechanism, 43 ... Oscillator, 44 ... Switching mechanism, 45 ... Forward rotation engagement mechanism, 46 ... Reverse rotation engagement mechanism, 47 ... Keyway, 48
... double pinion gear, 49 ... slide key, 50 ... forward gear, 51 ... idle gear, 52 ... reverse gear, 53 ... shaft, 54 ... change, 55 ... lever, 56 ... square pin, 57 ... ball plunger, 58 ... Forward rotation kick pin, 59 ... First forward rotation transmission pin, 60 ... Second forward rotation transmission pin, 61 ... Reverse rotation kick pin, 62 ... First reverse rotation transmission pin,
63 ... Second reverse transmission pin, 100 ... Soot blower, 10
1 ... Main body, 102 ... Inner tube, 103 ... Lance tube, 104 ... Traveling head, 105 ... Nozzle, 106 ... Feed screw, 107 ... Motor, 10
8 ... Screw bush, 109 ... Rotation transmission device, 110
... key groove, 111 ... pinion gear, 112 ... slide key, 113 ... large gear.

Claims (3)

[Claims] 1. A main body, an inner tube provided on the main body, a lance tube provided on the inner tube so as to be movable back and forth and rotatably, and a body provided on the main body so as to be movable back and forth to rotatably support the lance tube. A traveling head, a nozzle provided on the lance tube, a feed screw rotatably provided on the main body, a motor provided on the main body for rotating the feed screw, and a screw provided on the traveling head and screwed to the feed screw. A sootblower characterized by comprising a screw bush and an automatic reversing device that converts the rotation of the feed screw into the repeated rotation of the lance tube. 2. An automatic reversing device, a gear mechanism for extracting the rotation of a feed screw, a cam mechanism for converting the rotary motion of the gear mechanism into a linear reciprocating motion, and a linear reciprocating motion of the cam mechanism for repetitive rotation of a lance tube. The sootblower according to claim 1, further comprising a rack and pinion mechanism. 3. An automatic reversing device comprising a forward rotation gear mechanism for extracting the forward rotation of the feed screw, a reverse rotation gear mechanism for extracting the reverse rotation of the feed screw, an oscillator provided on the lance tube, and a forward rotation provided on the oscillator. A switching mechanism for switching between a transmission position and a reverse rotation transmission position, and an oscillator that is provided between the forward rotation gear mechanism and the switching mechanism and engages at the forward transmission position of the switching mechanism to rotate the forward rotation from the forward rotation gear mechanism. And a reverse rotation engagement mechanism that is provided between the reverse rotation gear mechanism and the switching mechanism and that engages at the reverse rotation engagement position of the switching mechanism to transmit the reverse rotation from the reverse rotation gear mechanism to the oscillator. The soot blower according to claim 1, which is composed of