WO1998010234A1

WO1998010234A1 - Water lance blaster for cleaning heat exchangers

Info

Publication number: WO1998010234A1
Application number: PCT/EP1997/004729
Authority: WO
Inventors: Peter Jentsch; Friedrich Katzenmeier; Hermann Mangold
Original assignee: Veag Vereinigte Energiewerke Ag; Mehldau & Steinfath Feuerungstechnik Gmbh
Priority date: 1996-09-04
Filing date: 1997-09-01
Publication date: 1998-03-12
Also published as: DE19637700C2; DE59707808D1; EP0932805A1; AU4619597A; DE19637700A1; EP0932805B1

Abstract

A water lance blaster for cleaning heat exchangers is disclosed. A box (34) with reinforcing metal sheets (3) is fixed in the hatch of the combustion chamber wall and the cardan joint (5) is fixed by a joint holder (6) in a bore (4). The nozzle head (9) with a blow tube (10) is screwed into the mouth (8) of the blasting tube. An anti-swirling vane (13) is set into the cylindrical part of the blow tube (10). Spindles (14; 15) are joined together by a transmission shaft (16) and angular gears (17). A ring (21) is set into the recess of the bearing housing (19) and a pressure ring (22) with fastening holes (36) is slipped over the guiding tube (20). An angular graduated scale (24) is arranged on the top arm (23) of the holder for the blow tube (10) and a pointer (26) which extends over the angular graduated scale (24) is arranged on the outer side of the cage (25) in which the blow tube (10) is mounted. Another angular graduated scale (27) is set on the outer side of the cage (25), in its horizontal centre line, and a dowel pin (28) is inserted into the sleeve (37) that receives the blow tube (10), in the vertical middle line of the cage (25).

Description

1 water lance blower for cleaning heat exchangers

The invention relates to a water lance blower for cleaning heat exchangers, in particular a combustion chamber heating surface in steam boilers during operation.

According to DE 41 42 448 a water lance blower for cleaning heat exchangers is already known, which with the mouth of the blow pipe via a universal joint in a hatch

10 of the combustion chamber wall is fixed and in which the rear part of the blow pipe is arranged in a guide which is vertically displaceable on a vertical spindle, the vertical spindle being horizontally displaceable on a horizontal spindle at the top and bottom. The horizontal 5 spindles are stored at their ends in a box, fastened there and are operatively connected on one side.

The guide is formed from a housing that does not rotate on the vertical spindle and on the side

2 _Q carries a fork-shaped holder, in which a gimbal-shaped cage is arranged, which is provided with a sleeve in its inner part and receives the blow tube in an axially displaceable manner. The horizontal spindles on this water lance blower are surrounded by a bellows to protect the spindles from dirt.

The disadvantage of this water lance blower is that the lower horizontal spindle is driven by a roller chain from the upper horizontal spindle. Due to the 0 manufacturing tolerance for a roller chain and the change in length of the roller chain that occurs during operation, readjustment for the lower horizontal spindle in both side boxes is necessary. So the attachment for the lower Spin5 del always had to be loosened, adjusted, aligned exactly parallel to the upper spindle and then tightened again. Furthermore, the horizontal and vertical pivoting of the blowpipe is in the middle position during operation Especially not recognizable and therefore the automatic cleaning process cannot be checked. The change of the bellows on the horizontal spindles that wear out relatively quickly makes it necessary to remove the spindles from the boxes.

The invention is based on the object, a water lance blower, which is arranged at the front via a universal joint in a hatch of the combustion chamber wall and at the rear via a guide on a vertical spindle which can be displaced on top and bottom on horizontally driven spindles and in which the guide consists of a housing with a there is a fork-shaped holder for a gimbal-shaped cage, in such a way that the respective position of the blowpipe can be seen during the cleaning process, a synchronous drive of the horizontal spindles is constantly guaranteed and the replacement of the bellows provided for dust protection on the horizontal spindles can be carried out on site with little effort and Vortex formation within the blow jet can be avoided.

According to the invention this is achieved in that a transition box made of trapezoidal, inwardly drawn, forming a square box side panels is inserted into the hatch of the combustion chamber wall, between the respective touching side panels within the box reinforcement plates are arranged with a receiving hole in the Receiving holes the universal joint is fastened via a joint holder, the mouth of the blow-through tube is inserted into the inner joint of the universal joint and the nozzle head with the subsequent blow tube is screwed into the mouth of the blow-through tube, the nozzle head is divided into an inflow cone and a head piece and into the cylindrical one Part of the blowpipe is a swirl plate, the upper horizontal spindle and the lower horizontal spindle are connected to each other via a rigid transmission shaft and angular gear, the horizontal Spindles are supported at the end in ball bearings, which are received by an annular bearing housing, which is provided with an external recess, and the bearing housings are connected to one another via a guide tube for the spindles, a split wedge-shaped ring is inserted into the recess of the bearing housing and onto the ring a pressure ring with mounting holes is pushed on from the guide tube, an angle scale is arranged on the upper tab of the fork-shaped holder for the blowpipe and on the outside of the cage receiving the blowpipe there is a pointer projecting beyond the angle scale, and another on the outside in the horizontal center line of the cage Angle scale is provided and a plug notch pin is inserted in the vertical central axis of the cage in the sleeve for receiving the blowpipe.

In a further embodiment, the transition box is provided with fastening plates on two opposite sides. Furthermore, the upper horizontal spindle is designed with the right direction of slope and the lower horizontal spindle with the left direction of slope. Bellows are pushed onto the guide tubes. The pressure ring is provided with a conical inner surface. The angle scales are marked with an increasing angle degree mark from the center outwards.

The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawing:

Fig. 1 is a front view of the water lance blower

Fig. 2 is a front view of the junction box

Fig. 3 is a side view of the junction box

Fig. 4 is a side view of the blow tube in section

Fig. 5 the upper horizontal spindle in cross section. 6 is a top view of the guide for the blow pipe

Fig. 7 is a side view of the guide for the blow pipe

Fig. 8 is a front view of the subframe The water lance blower consists essentially of two horizontal spindles 14; 15, a vertical spindle 30, a blowpipe 10, a transition box 1, a left spar 31, a right spar 32 and a guide 33 for the blowpipe.

The transition box 1 is used to fasten the mouth of the blowpipe 10 via an auxiliary frame 40 in a hatch of the combustion chamber wall. The transition box 1 consists of trapezoidal, inwardly drawn, side plates 2 forming a square box 34. Between the respective touching side plates 2, reinforcing plates 3 with a receiving bore 4 are arranged inside the box 34. The junction box 1 is provided on two opposite sides with mounting plates 29, with which the attachment to the subframe 40 takes place. Via the holes 41 arranged in addition to the fastenings of the transition box 1 on the auxiliary frame 40, the water lance blower is set up on the combustion chamber wall in such a way that the mouth of the blowpipe 10 is located centrally in the existing hatch of the combustion chamber wall. The universal joint 5 is fastened in the receiving bores 4 via a joint holder 6. In the inner joint 7 of the universal joint 5, the mouth 8 of the blow-through tube is inserted. The nozzle head 9 with the adjoining blowpipe 10 is screwed into the mouth 8 of the blow-through tube. The nozzle head 9 is divided into an inflow cone 11 and a head piece 12.

This ensures better production engineering compliance with the inner nozzle head geometry to ensure the blast jet quality. The swirl plate 13 required to generate a laminar flow necessary in the blowpipe 10 is arranged at the rear end of the cylindrical part of the blowpipe 10. This eliminates turbulence in the area of the nozzle head. The blow pipe 10 sits with its rear part in the guide 33, which is arranged on the vertical spindle 30 so as to be vertically displaceable. The vertical spindle 30 is on top of the horizontal spindle 14 and below on the horizontal Spindle 15 mounted and horizontally displaceable on this. The vertical spindle 30 is driven by a gear motor 35. The horizontal spindles 14; 15 are supported at the ends in ball bearings 18 which are received by an annular bearing housing 19. The bearing housings 19 are provided with an external recess into which a split wedge-shaped ring 21 is inserted. The bearing housing 19 are via a guide tube 20 for the horizontal spindles 14; 15 connected together. A pressure ring 22 with fastening holes 36 is pushed onto the ring 21 from the guide tube 20. The pressure ring 22 is provided with a conical inner surface. Thus, when pushing the pressure ring 22 onto the ring 21, the latter is clamped on the bearing housing 19. About the mounting holes 36, the horizontal spindles 14; 15 in the side rails 31; 32 braced. The horizontal spindles 14; 15 are connected on one side within the spar 31 or 32 via a rigid transmission shaft 16 and angular gear 17. In order to ensure the same direction of rotation and thus a synchronous drive for the horizontal displacement of the vertical spindle 30, the upper horizontal spindle 14 is provided with a right-hand pitch direction and the lower horizontal spindle 15 with a left-hand pitch direction. To protect the horizontal spindles 14; 15 are pushed onto the guide tubes 20 each by a bellows 39. The upper horizontal spindle 14 is connected to a corresponding drive via a slip clutch 38. To change the bellows 39 on the horizontal spindles 14; 15 are only both pressure rings 22 from the spar 31; 32 and the entire assembly can be removed from the water lance blower without disassembling it.

The special design of the storage for the horizontal spindles 14; 15 also enables their disassembly and assembly on site, since a relatively easy adjustment of the parallelism of the spindles 14; 15 can be made. The guide 33 for the blow pipe 10 is formed from a housing which is not rotatably seated on the vertical spindle 30.

The housing carries a fork-shaped holder on the side, in which a gimbal-shaped cage 25 is arranged. The cage 25 is formed in its inner part as a sleeve 37 and receives the blow tube 1 axially displaceably therein. An angle scale 24 is arranged on the upper tab 23 of the fork-shaped holder, and a pointer 26 projecting beyond the angle scale 24 is arranged on the outside of the cage 25. The angle scale 24 is provided with an increasing angle degree marking from the center outwards. The horizontal position of the blowpipe 10 during the cleaning process can thus be seen.

In the horizontal center line of the cage 25, another similar angle scale 27 is arranged on the outside thereof and a plug-in notch pin 28 is inserted into the sleeve 37 in the vertical central axis of the cage 25. The vertical position of the blowpipe 10 can be seen on this angle scale 27.

List of the reference symbols used

1 junction box 35 geared motor

2 side plate 36 mounting hole

3 reinforcement plate 37 sleeve

4 Location hole 38 slip clutch

5 universal joint 39 bellows

6 articulated brackets 40 subframes

7 joint 41 bore

8 mouth

9 nozzle head

10 blowpipe

11 inlet cone

12 head piece

13 swirl plate

14 spindle

15 spindle

16 transmission wave

17 angular gear

18 ball bearings

19 bearing housing

20 guide tube

21 ring

22 pressure ring

23 tab

24 angle scale

25 cage

26 hands

27 angle scale

28 notch pin

29 mounting plate

30 spindle

31 spar

32 spar

33 leadership

34 box

Claims

claims

1.Water lance blower for cleaning heat exchangers, in particular a combustion chamber heating surface in steam boilers, which is attached to the mouth of the blowpipe via a cardan joint in a hatch of the combustion chamber wall, the rear part of the blowpipe is arranged in a guide which is vertically displaceable on a vertical spindle, the vertical spindle is horizontally displaceable on a horizontal spindle at the top and bottom, the horizontal spindles are mounted at their ends in a box and fastened there and are operatively connected to one another on one side, the guide is formed from a housing that cannot be rotated sits on the vertical spindle and carries on the side a fork-shaped holder, in which a gimbal-shaped cage is arranged, which is provided with a sleeve in its inner part and receives the blow tube axially displaceably therein, characterized in that an auxiliary frame () in the hatch of the combustion chamber wall ( 4th 0) a transition box (1) made of trapezoidal, inwardly drawn, a square box (34) forming side plates (2) is inserted between the respective touching side plates (2) within the box (34) reinforcing plates (3) with a receiving hole - tion (4) are arranged, in the receiving bores (4) the universal joint (5) is fastened via a joint holder (6), in the inner joint (7) of the universal joint (5) the mouth (8) of the blow-through tube is inserted and the nozzle head (9) with the adjoining blowpipe (10) is screwed into the mouth (8) of the blow-through tube, the nozzle head (9) is divided into an inflow cone (11) and a head piece (12) and into the cylindrical part of the blowpipe ( 10) a swirl plate (13) is inserted, the upper horizontal spindle (14) and the lower horizontal spindle (15) are connected to one another via a rigid transmission shaft (16) and angular gear (17), the horizontal spindles (14; 15) are supported at the ends in ball bearings (18) by an annular bearing housing (19), which is provided with an external recess, and the bearing housings (19) are connected to one another via a guide tube (20) for the spindles (14; 15), a divided wedge-shaped ring () is inserted into the recess of the bearing housing (19). 21) and a pressure ring (22) with fastening holes (36) is pushed onto the ring (21) from the guide tube (20), an angle scale (24) on the upper tab (23) of the fork-shaped holder for the blow tube (10) and on the outside of the blow tube (10) accommodating the cage (25) a pointer (26) projecting beyond the angle scale (24) is arranged, in the horizontal center line of the cage (25) on the outside thereof a further angle scale (27) and in vertical center axis of the cage (25) in the sleeve (37) for receiving the blow pipe (10) a plug-in pin (28) is inserted.

2. Water lance blower according to claim 1, characterized in that the transition box (1) is provided on two opposite sides with mounting plates (29).

3. Water lance blower according to claim 1 and 2, characterized in that the upper horizontal spindle (14) is formed with the right direction of slope and the lower horizontal spindle (15) with the left direction of slope.

4. Water lance blower according to claim 1 to 3, characterized in that bellows (39) are pushed onto the guide tubes (20).

5. Water lance blower according to claim 1 to 4, characterized in that the pressure ring (22) is provided with a conical inner surface.

6. Water lance blower according to claim 1 to 5, characterized in that the angle scales (24; 27) from the center to the outside are provided with increasing angular degree marking.

8 pages of drawings