CN213727143U

CN213727143U - Blanking device of dust remover

Info

Publication number: CN213727143U
Application number: CN202022526116.2U
Authority: CN
Inventors: 李伟标; 周登峰; 曹伟达
Original assignee: Shaoxing Yixin New Material Co ltd
Current assignee: Shaoxing Yixin New Material Co ltd
Priority date: 2020-11-05
Filing date: 2020-11-05
Publication date: 2021-07-20
Anticipated expiration: 2030-11-05

Abstract

The application relates to the field of dust collectors, in particular to a discharging device of a dust collector, which comprises an ash bucket, a discharging pipe connected to the ash bucket and a collecting bag connected to the discharging pipe, wherein a hanging rod is connected to the outer side wall of the discharging pipe, a hanging hole is formed in the collecting bag, and the hanging rod penetrates through the hanging hole; the outer side wall of the discharge pipe is connected with a connecting assembly, the connecting assembly comprises a connecting block, a propping block and a screw rod, the connecting block is connected to the outer side wall of the discharge pipe, the screw rod is in threaded connection with the connecting block, one end of the screw rod penetrates through the connecting block to extend towards the direction close to the discharge pipe and is connected with the propping block, and the propping block props the collection bag tightly against the outer side wall of the discharge pipe; the other end of the threaded rod penetrates out of the connecting block and is connected with an operating handle. This application has the effect that the dust that is collected in the collection bag is run out again to the workshop in reducing.

Description

Blanking device of dust remover

Technical Field

The application relates to the field of dust collectors, in particular to a discharging device of a dust collector.

Background

With the development of modern industry, the pollution of dust to the environment and the influence of human health are increasingly serious, and the control of dust pollution and the purification of human living environment become common knowledge of all people. In order to maintain clean production environment, places polluted by dust must be cleaned in time.

The process of production vitrification microballon and heated board can produce more dust, need in time collect the dust, reduces the pollution of dust to the workshop, reduces the influence that causes operating personnel health.

The utility model discloses a chinese utility model patent that grant publication number is CN202490685U discloses a take single-chamber electric field dust remover of ash bucket deep bead, including the support, the support is put on the shelf and is equipped with the casing, is equipped with anode system, negative pole system in the casing, and anode system, negative pole system are connected with the positive pole respectively and shake, the negative pole shakes and shakes, are equipped with air inlet, gas outlet on the casing, and the ash bucket is connected to the casing lower extreme, and the inside ash inlet department of ash bucket is equipped with the ash bucket deep bead. An inlet airflow distribution plate is arranged at the air inlet.

To the correlation technique among the above-mentioned, the inventor thinks ash bucket below generally to be connected with the discharging pipe, connects on the discharging pipe in the collection bag that is used for collecting the dust, is provided with the peg on the general discharging pipe lateral wall, has seted up the hanging hole on the collection bag, and the peg passes the hanging hole and connects the collection bag on the discharging pipe, and this kind of condition collection bag sack is opened greatly, and the dust of collecting in the collection bag runs out to the workshop again easily.

SUMMERY OF THE UTILITY MODEL

In order to reduce and to be run out again to the workshop to the dust in being collected the collection bag, the application provides a unloader of dust remover.

The application provides a unloader of dust remover adopts following technical scheme:

a discharging device of a dust remover comprises an ash bucket, a discharging pipe connected to the ash bucket and a collecting bag connected to the discharging pipe, wherein a hanging rod is connected to the outer side wall of the discharging pipe, a hanging hole is formed in the collecting bag, and the hanging rod penetrates through the hanging hole; the outer side wall of the discharge pipe is connected with a connecting assembly, the connecting assembly comprises a connecting block, a propping block and a screw rod, the connecting block is connected to the outer side wall of the discharge pipe, the screw rod is in threaded connection with the connecting block, one end of the screw rod penetrates through the connecting block to extend towards the direction close to the discharge pipe and is connected with the propping block, and the propping block props the collection bag tightly against the outer side wall of the discharge pipe; the other end of the threaded rod penetrates out of the connecting block and is connected with an operating handle.

Through adopting above-mentioned technical scheme, when will collect the bag and install to the discharging pipe on, will collect the bag and hang on the peg through the hanging hole, rotate operating handle again and drive the threaded rod and rotate to the direction that is close to the discharging pipe, will collect the bag sack until supporting tight piece on discharging pipe lateral wall, reduce and collect the open size of bag sack, and then reduce and be collected the dust in the collection bag and run out the condition emergence to the workshop again.

Optionally, be provided with the subassembly that slides that drives the connecting block and slide on the discharging pipe, the subassembly that slides includes the slider of being connected with the connecting block and connects the slide rail on the slider, set up on the discharging pipe lateral wall with the slide rail complex spout that slides, be provided with on the slider and fix a position the locating component on the discharging pipe with slider and connecting block.

Through adopting above-mentioned technical scheme, the slider is connected with the connecting block, and the slide rail on the connecting block slides the cooperation with the spout on the discharging pipe to fix a position slider and connecting block through locating component. When needs are connected to the discharging pipe with the collection bag on, follow spout rebound with connecting block and slider earlier, pass through the hanging hole again with the collection bag sack and link on the discharging pipe with the peg, then follow spout rebound with connecting block and slider to be positioned connecting block and slider on the discharging pipe lateral wall through locating component.

Optionally, a first positioning hole is formed in the outer side wall of the discharge pipe, the positioning assembly comprises a positioning bolt and a positioning handle connected to the positioning bolt, the positioning bolt penetrates through the sliding block to be in inserting connection with the first positioning hole, and the opening of the collection bag is located between the connecting block and the discharge pipe.

Through adopting above-mentioned technical scheme, when needs will collect the bag and be connected to on the discharging pipe, earlier with connecting block and slider along spout rebound, will collect the bag sack again and pass through hanging hole and peg graft and connect on the discharging pipe, then with connecting block and slider along spout rebound, and pass the slider back with the cooperation of pegging graft of first locating hole with the location bolt, it is located between connecting block and the discharging pipe to collect the bag opening this moment, it drives the threaded rod rotation to rotate operating handle again, make to support tight piece and remove to being close to collection bag open-ended direction, support tightly on the discharging pipe lateral wall until supporting tight piece will collect the bag sack, make the installation and the change of collecting the bag more convenient simple.

Optionally, a second positioning hole is formed in the outer side wall of the discharge pipe, the second positioning hole is located above the first positioning hole, and when the positioning bolt is matched with the second positioning hole in an inserted manner, the opening of the collection bag is lower than the connecting block.

Through adopting above-mentioned technical scheme, when needs will collect the bag and be connected to on the discharging pipe, will connect connecting block and slider along spout rebound earlier, pass the slider back with the location bolt again and the cooperation of pegging graft of second locating hole, will collect the bag again and connect on the discharging pipe through hanging hole and peg, make the operation of collecting the bag and installing on the discharging pipe more convenient.

Optionally, a tightening assembly is arranged on the sliding block, the tightening assembly comprises a compression spring and a tightening piece, a tightening groove is formed in the sliding block, the tightening piece is connected in the tightening groove in a sliding manner, the tightening piece is connected to the positioning plug pin, one end of the compression spring is connected with one end, close to the positioning handle, of the tightening piece, and the other end of the compression spring is connected with one end, close to the positioning handle, of the tightening piece.

Through adopting above-mentioned technical scheme, the location bolt supports tightly on first locating hole or second locating hole through compression spring's elasticity effort, strengthens the joint strength of location bolt and discharging pipe lateral wall.

Optionally, the discharging pipe bottom is connected with ejection of compact cover, from last to down, the diameter crescent of ejection of compact cover, the contact of collection bag inside wall and ejection of compact cover lateral wall.

Through adopting above-mentioned technical scheme, from last to extremely down, the diameter of ejection of compact cover increases gradually to in ejection of compact cover stretches into the collection bag, the contact of collection bag inner wall and ejection of compact cover lateral wall, the dust that makes collection in the bag is difficult for running out again to the workshop in.

Optionally, a rotating shaft is rotationally connected in the discharge pipe, and a stirring blade is connected to the rotating shaft and is arranged in a spiral shape; and a driving assembly for driving the rotating shaft to rotate is arranged on the discharge pipe.

Through adopting above-mentioned technical scheme, drive the axis of rotation through drive assembly and rotate, the axis of rotation rotates and drives the stirring leaf and rotate, makes things convenient for the dust in the discharging tube to fall out to collecting the bag in from the discharging tube, reduces the long-pending of dust in the discharging tube to a certain extent and stays.

Optionally, the driving assembly includes a first bevel gear, a second bevel gear and a driving motor, the first bevel gear is coaxially connected to the rotating shaft, the driving motor is connected to the discharging pipe, an output shaft of the driving motor extends into the discharging pipe to be coaxially connected with the second bevel gear, and the second bevel gear is engaged with the first bevel gear; and a mounting assembly for mounting the first bevel gear and the second bevel gear is arranged in the discharge pipe.

Through adopting above-mentioned technical scheme, when the drive axis of rotation rotated, open driving motor and drive the rotation of second bevel gear, second bevel gear pivoted drives first bevel gear and rotates, and first bevel gear rotates and drives the axis of rotation and rotate to first bevel gear and second bevel gear all install in the discharging tube through the installation component, make convenient operation simple.

Optionally, the mounting assembly comprises a mounting block and a mounting rod, one end of the mounting rod extends into the discharge pipe and is connected with the mounting block, a threaded section is arranged at one end of the mounting rod, which is far away from the mounting block, and a fastening nut is connected to the threaded section in a threaded manner; the mounting block is internally provided with a connecting groove, the first bevel gear and the second bevel gear are arranged in the connecting groove, the rotating shaft is connected onto the mounting block through a bearing, and the output shaft of the driving motor is connected onto the mounting block through a bearing.

By adopting the technical scheme, the first bevel gear and the second bevel gear are arranged in the mounting block, the mounting block is connected to the discharging pipe through the mounting rod, and the rotating shaft is connected to the mounting block through the bearing, so that the rotating shaft rotates in the circumferential direction and is axially and fixedly connected to the mounting block; the output shaft of the driving motor is arranged on the mounting block through a bearing, so that the output shaft of the driving motor axially rotates and is axially and fixedly connected to the mounting block, and the connection strength of the mounting block and the output shaft of the driving motor is enhanced to a certain degree.

Optionally, a protection barrel is sleeved on the rotating shaft, one end of the protection barrel is connected with the outer side wall of the mounting block, and the other end of the protection barrel is connected with the inner side wall of the discharge pipe.

Through adopting above-mentioned technical scheme, set up the protective sheath on the axis of rotation, have the effect of protection axis of rotation to the protective sheath both ends are connected with installation piece, discharging pipe inside wall respectively, strengthen the joint strength between installation piece and the discharging pipe inside wall to a certain extent.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the size of the opening of the bag opening of the collecting bag is reduced through the connecting component, so that the situation that the dust collected into the collecting bag runs out of the workshop again is reduced;

2. the sliding block is connected with the connecting block, a sliding rail on the connecting block is in sliding fit with a sliding groove on the discharging pipe, and the sliding block and the connecting block are positioned through the positioning assembly;

3. drive the axis of rotation through drive assembly and rotate, the axis of rotation rotates and drives the stirring leaf and rotate, makes things convenient for the dust in the discharging tube to fall out to collecting the bag in from the discharging tube, reduces the long-pending of dust in the discharging tube to a certain extent and stays.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 showing the mounting assembly, the rotatable shaft, the drive assembly, the coupling assembly, the positioning assembly, and the outfeed housing;

FIG. 3 is a sectional view of the mounting assembly and drive assembly of FIG. 2

FIG. 4 is an enlarged view of portion B of FIG. 3 showing the connecting assembly, the positioning assembly and the hold-down assembly

FIG. 5 is a schematic diagram of an exploded configuration of the tapping tube and slide.

Description of reference numerals: 1. a dust collector body; 11. an ash hopper; 12. a collection bag; 121. hanging holes; 2. a discharge pipe; 21. a discharge cover; 22. a hanging rod; 23. a first positioning hole; 24. a second positioning hole; 25. a chute; 3. mounting the component; 31. mounting blocks; 311. mounting grooves; 32. mounting a rod; 33. fastening a nut; 4. a rotating shaft; 41. stirring blades; 5. a drive assembly; 51. a first bevel gear; 52. a second bevel gear; 53. a drive motor; 54. a protective cylinder; 6. a connecting assembly; 61. connecting blocks; 62. a propping block; 63. a screw; 631. an operating handle; 7. a slipping component; 71. a slider; 711. abutting against the groove; 72. a slide rail; 8. a positioning assembly; 81. positioning a bolt; 82. a positioning handle; 9. a propping component; 91. a compression spring; 92. and a support sheet.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses unloader of dust remover. Referring to fig. 1, the discharging device of the dust collector comprises an ash bucket 11, a discharging pipe 2 and a collecting bag 12, wherein the ash bucket 11 is fixedly connected to the lower end of a dust collector body 1.

The lower end of the discharge pipe 2 is fixedly connected below the ash bucket 11, and the discharge pipe 2 is cylindrical in shape.

Referring to fig. 2 and 3, be provided with installation component 3 on discharging pipe 2, installation component 3 includes installation piece 31 and installation pole 32, and installation pole 32 level sets up, and installation pole 32 radially stretches into in discharging pipe 2 along discharging pipe 2, and installation piece 31 sets up in discharging pipe 2, and installation pole 32 stretches into the one end and the installation piece 31 fixed connection of discharging pipe 2. The one end that installation piece 31 was kept away from to installation pole 32 is located outside discharging pipe 2, and the one end that installation piece 31 was kept away from to installation pole 32 is provided with the screw thread section, and threaded connection has fastening nut 33 on the screw thread section, and fastening nut 33 is close to the one end of discharging pipe 2 and supports tightly with discharging pipe 2 lateral wall.

Mounting groove 311 has been seted up in the installation piece 31, and the rotation is connected with axis of rotation 4 through the bearing rotation on the installation piece 31, and the vertical setting of axis of rotation 4, fixedly connected with stirring leaf 41 on the axis of rotation 4, stirring leaf 41 sets the heliciform.

The discharging pipe 2 is provided with a driving component 5 for driving the rotating shaft 4 to rotate, the driving component 5 comprises a first bevel gear 51, a second bevel gear 52 and a driving motor 53, and the first bevel gear 51 and the second bevel gear 52 are both arranged in the mounting groove 311. The first bevel gear 51 is coaxially and fixedly connected to the rotating shaft 4, the driving motor 53 is fixedly connected to the discharging pipe 2 through a bolt, an output shaft of the driving motor 53 is horizontally arranged, the output shaft of the driving motor 53 extends into the discharging pipe 2 and is coaxially and fixedly connected with the second bevel gear 52, and the second bevel gear 52 is meshed with the first bevel gear 51.

And an output shaft of the driving motor 53 is rotatably coupled to the mounting block 31 through a bearing. The rotating shaft 4 is sleeved with a protection barrel 54, one end of the protection barrel 54 is fixedly connected with the outer side wall of the mounting block 31 through a bolt, and the other end of the protection barrel 54 is fixedly connected with the inner side wall of the discharge pipe 2 through a bolt.

The lower extreme of discharging pipe 2 passes through bolt fixedly connected with ejection of compact cover 21, and ejection of compact cover 21 appearance sets to cylindrically, and from last direction down, the diameter of ejection of compact cover 21 increases gradually.

Referring to fig. 3 and 4, a hanging rod 22 is fixedly connected to the lower end of the discharging pipe 2, the hanging rod 22 is horizontally arranged, and the hanging rod 22 is located above the discharging cover 21. The upper end of the collecting bag 12 is provided with a hanging hole 121, and the collecting bag 12 passes through the hanging hole 121 through the hanging rod 22 and is connected on the discharge pipe 2.

Be provided with coupling assembling 6 on discharging pipe 2 lateral wall, coupling assembling 6 includes connecting block 61, supports tight block 62 and screw rod 63. Connecting block 61 slides along vertical direction and connects on discharging pipe 2 lateral wall, and screw rod 63 threaded connection is on connecting block 61, and screw rod 63 level sets up. The screw rod 63 is close to the one end of discharging pipe 2 and supports tight piece 62 fixed connection, supports tight piece 62 appearance and sets to cylindrically, and the screw rod 63 is kept away from the one end that supports tight piece 62 and is passed connecting block 61 fixedly connected with operating handle 631.

Referring to fig. 5, a sliding assembly 7 for driving the connecting block 61 to slide is arranged on the discharging pipe 2, and the sliding assembly 7 comprises a sliding block 71 and a sliding rail 72. Slider 71 fixed connection is in connecting block 61 top, and slider 71 is close to the one end and the slide rail 72 fixed connection of discharging pipe 2 lateral wall, and slide rail 72 is vertical to be set up. The outer side wall of the discharge pipe 2 is provided with a sliding groove 25 which is vertically arranged, and the sliding rail 72 is connected to the sliding groove 25 in a sliding manner along the vertical direction.

Referring to fig. 3 and 4, the outer sidewall of the tapping pipe 2 is provided with a first positioning hole 23 and a second positioning hole 24, the first positioning hole 23 and the second positioning hole 24 are distributed along the vertical direction of the tapping pipe 2, and the first positioning hole 23 is located below the second positioning hole 24. The sliding block 71 is provided with a positioning assembly 8 for positioning the sliding block 71 and the connecting block 61 on the discharge pipe 2, and the positioning assembly 8 comprises a positioning bolt 81 and a positioning handle 82. The positioning bolt 81 is horizontally arranged, and the positioning handle 82 is fixedly connected to the positioning bolt 81.

When one end of the positioning plug 81, which is far away from the positioning handle 82, passes through the sliding block 71 and is in plugging fit with the first positioning hole 23, the opening of the collection bag 12 is positioned between the connecting block 61 and the discharge pipe 2.

When one end of the positioning latch 81 far away from the positioning handle 82 passes through the sliding block 71 and then is in splicing fit with the second positioning hole 24, the opening of the collection bag 12 is lower than the connecting block 61.

The sliding block 71 is provided with a pressing component 9, and the pressing component 9 comprises a compression spring 91 and a pressing sheet 92. The slider 71 is provided with a horizontally disposed tightening groove 711, and the tightening piece 92 is connected to the tightening groove 711 in a sliding manner along the horizontal direction. The abutting sheet 92 is cylindrical in shape, and the abutting sheet 92 is coaxially and fixedly connected to the positioning bolt 81. One end of the compression spring 91 is fixedly connected with one end of the abutting sheet 92 close to the positioning handle 82, and the other end is fixedly connected with one end of the abutting groove 711 close to the positioning handle 82.

The implementation principle of the blanking device of the dust remover in the embodiment of the application is as follows:

when the collecting bag 12 needs to be connected to the discharging pipe 2, the connecting block 61 and the sliding block 71 move upwards along the sliding groove 25, the positioning pin 81 penetrates through the sliding block 71 and then is in insertion fit with the second positioning hole 24, abuts against the second positioning hole 24 under the elastic action of the compression spring 91, and then the collecting bag 12 is connected to the discharging pipe 2 through the hanging hole 121 and the hanging rod 22.

Then with connecting block 61 and slider 71 along spout 25 downstream, and with the cooperation of pegging graft of locating pin 81 with first locating hole 23 behind passing slider 71, and support tightly on first locating hole 23 under compression spring 91's elastic force, collect bag 12 opening this moment and be located between connecting block 61 and discharging pipe 2, rotate operating handle 631 and drive the threaded rod rotation again, make to support tight piece 62 and remove to being close to the open-ended direction of collecting bag 12, support tight piece 62 and support tight on discharging pipe 2 lateral wall with collecting bag 12 sack until.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a unloader of dust remover, includes ash bucket (11), connects discharging pipe (2) on ash bucket (11) and connects collection bag (12) on discharging pipe (2), its characterized in that: the outer side wall of the discharge pipe (2) is connected with a hanging rod (22), a hanging hole (121) is formed in the collection bag (12), and the hanging rod (22) penetrates through the hanging hole (121); the outer side wall of the discharge pipe (2) is connected with a connecting assembly (6), the connecting assembly (6) comprises a connecting block (61), a abutting block (62) and a screw rod (63), the connecting block (61) is connected to the outer side wall of the discharge pipe (2), the screw rod (63) is in threaded connection with the connecting block (61), one end of the screw rod penetrates through the connecting block (61) to extend towards the direction close to the discharge pipe (2) and is connected with the abutting block (62), and the abutting block (62) abuts against the collecting bag (12) on the outer side wall of the discharge pipe (2); the other end of the screw rod penetrates through the connecting block (61) and is connected with an operating handle (631).

2. The blanking device of the dust remover as claimed in claim 1, wherein: be provided with on discharging pipe (2) and drive slip subassembly (7) that connecting block (61) slided, slip subassembly (7) include slider (71) and connect slide rail (72) on slider (71), set up on discharging pipe (2) lateral wall and slide complex spout (25) with slide rail (72), be provided with on slider (71) and be located positioning assembly (8) on discharging pipe (2) with slider (71).

3. The blanking device of the dust remover as claimed in claim 2, wherein: first locating hole (23) have been seted up on discharging pipe (2) lateral wall, locating component (8) are including location bolt (81) and connect location handle (82) on location bolt (81), location bolt (81) pass slider (71) and peg graft the cooperation with first locating hole (23), and this moment collection bag (12) opening is located between connecting block (61) and discharging pipe (2).

4. The blanking device of the dust remover as claimed in claim 3, wherein: a second positioning hole (24) is formed in the outer side wall of the discharge pipe (2), the second positioning hole (24) is located above the first positioning hole (23), and when the positioning bolt (81) is in splicing fit with the second positioning hole (24), the opening of the collection bag (12) is lower than the connecting block (61).

5. The blanking device of the dust remover as claimed in claim 4, wherein: the clamping device is characterized in that a clamping component (9) is arranged on the sliding block (71), the clamping component (9) comprises a compression spring (91) and a clamping piece (92), a clamping groove (711) is formed in the sliding block (71), the clamping piece (92) is connected in the clamping groove (711) in a sliding mode, the clamping piece (92) is connected to the positioning bolt (81), one end of the compression spring (91) is connected with one end, close to the positioning handle (82), of the clamping piece (92), and the other end of the compression spring is connected with one end, close to the positioning handle (82), of the clamping groove (711).

6. The blanking device of the dust remover as claimed in claim 1, wherein: discharging pipe (2) bottom is connected with ejection of compact cover (21), from last extremely down, the diameter crescent of ejection of compact cover (21), collect bag (12) inside wall and the contact of ejection of compact cover (21) lateral wall.

7. The blanking device of the dust remover as claimed in claim 1, wherein: a rotating shaft (4) is rotatably connected to the discharging pipe (2), a stirring blade (41) is connected to the rotating shaft (4), and the stirring blade (41) is arranged in a spiral shape; the discharging pipe (2) is provided with a driving component (5) which drives the rotating shaft (4) to rotate.

8. The blanking device of the dust remover as claimed in claim 7, wherein: the driving assembly (5) comprises a first bevel gear (51), a second bevel gear (52) and a driving motor (53), the first bevel gear (51) is coaxially connected to the rotating shaft (4), the driving motor (53) is connected to the discharging pipe (2), an output shaft of the driving motor (53) extends into the discharging pipe (2) to be coaxially connected with the second bevel gear (52), and the second bevel gear (52) is meshed with the first bevel gear (51); and a mounting component (3) for mounting a first bevel gear (51) and a second bevel gear (52) is arranged in the discharge pipe (2).

9. The blanking device of the dust remover as claimed in claim 8, wherein: the mounting assembly (3) comprises a mounting block (31) and a mounting rod (32), one end of the mounting rod (32) extends into the discharge pipe (2) and is connected with the mounting block (31), a threaded section is arranged at one end, far away from the mounting block (31), of the mounting rod (32), and a fastening nut (33) is connected to the threaded section in a threaded manner; a connecting groove is formed in the mounting block (31), the first bevel gear (51) and the second bevel gear (52) are arranged in the connecting groove, the rotating shaft (4) is connected to the mounting block (31) through a bearing, and an output shaft of the driving motor (53) is connected to the mounting block (31) through a bearing.

10. The blanking device of the dust remover as claimed in claim 9, wherein: the rotating shaft (4) is sleeved with a protection barrel (54), one end of the protection barrel (54) is connected with the outer side wall of the mounting block (31), and the other end of the protection barrel is connected with the inner side wall of the discharge pipe (2).