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US20190316792A1 - Vent pipe and blower comprising the same - Google Patents

Vent pipe and blower comprising the same Download PDF

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Publication number
US20190316792A1
US20190316792A1 US16/455,804 US201916455804A US2019316792A1 US 20190316792 A1 US20190316792 A1 US 20190316792A1 US 201916455804 A US201916455804 A US 201916455804A US 2019316792 A1 US2019316792 A1 US 2019316792A1
Authority
US
United States
Prior art keywords
vent pipe
air
base plate
side plates
air channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US16/455,804
Inventor
Chenglin LIANG
Hongmei Zhao
Wei Lei
Shuangxi SONG
Baixian XIAO
Huixiu CHEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhongshan Broad Ocean Motor Co Ltd
Original Assignee
Zhongshan Broad Ocean Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhongshan Broad Ocean Motor Co Ltd filed Critical Zhongshan Broad Ocean Motor Co Ltd
Assigned to ZHONGSHAN BROAD-OCEAN MOTOR CO., LTD. reassignment ZHONGSHAN BROAD-OCEAN MOTOR CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHEN, Huixiu, LEI, WEI, LIANG, Chenglin, SONG, SHUANGXI, XIAO, Baixian, ZHAO, HONGMEI
Publication of US20190316792A1 publication Critical patent/US20190316792A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F24F7/065—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit fan combined with single duct; mounting arrangements of a fan in a duct
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates

Definitions

  • This disclosure relates to a vent pipe and a blower comprising the same.
  • a blower typically includes a motor, a volute including an air inlet and an air outlet, a blade wheel, and a vent pipe communicating with the air outlet.
  • the vent pipe is composed of four flat plates, and the air volume and static pressure of the vent pipe cannot be adjustable.
  • a vent pipe and a blower comprising the same.
  • An air deflector is disposed in the vent pipe to adjust the air volume and static pressure in the vent pipe.
  • the disclosure provides a vent pipe, comprising: a top plate; two side plates; a base plate; an air channel formed by the top plate, the two side plates, and the base plate, and the air channel comprising a first air inlet and a first air outlet; and an air deflector disposed on the base plate and located on one side of the first air outlet.
  • the air deflector can be perpendicular to the base plate.
  • One end of the base plate can extend out of the air channel to form an extension plate, and the air deflector can be disposed on the extension plate.
  • the air deflector can be disposed in the air channel.
  • the two side plates can be integrated with the top plate.
  • the lower ends of the two side plates can bend away from the air channel to form convex flanges; two sides of the base plate can extend to form clamping units; and the convex flanges can be clamped by the clamping units.
  • the air channel can be rectangular in shape.
  • a blower comprising a motor; a volute; a blade wheel; and the aforesaid vent pipe.
  • the volute comprises a chamber and the blade wheel is disposed in the chamber; the volute comprises a second air inlet and a second air outlet both communicating with the chamber; the motor is disposed on the volute; and the vent pipe communicates with the second air outlet.
  • the volute can comprise a top surface provided with a plurality of mounting holes; a mounting plate can be fixed on the top surface via the plurality of mounting holes and can comprise a through hole; the motor can be disposed on the mounting plate and can comprise a revolving shaft; the front end of the revolving shaft of the motor can pass through the through hole of the mounting plate to connect to the blade wheel in the chamber.
  • vent pipe and a blower comprising the same as described in the disclosure are summarized as follows.
  • the base plate of the vent pipe is provided with an air deflector, so that the air volume and static pressure in the vent pipe are adjustable.
  • the air deflector is perpendicular to the base plate.
  • the design is cost-effective.
  • the air deflector is disposed in the air channel or on an extension plate of the base plate.
  • the arrangement is flexible.
  • the lower ends of the two side plates are bent away from the air channel to form convex flanges; two sides of the base plate extend to form clamping units; and the convex flanges are clamped by the clamping units.
  • the connection of the base plate and the two side plates is firm and reliable.
  • FIG. 1 is a schematic diagram of a vent pipe in Example 1;
  • FIG. 2 is an exploded view of a vent pipe in Example 1;
  • FIG. 3 is a front view of a vent pipe in Example 1;
  • FIG. 4 is a sectional view taken from line A-A in FIG. 3 ;
  • FIG. 5 is a sectional view taken from line B-B in FIG. 3 ;
  • FIG. 6 is a schematic diagram of a vent pipe in Example 2.
  • FIG. 7 is a schematic diagram of a blower in Example 3.
  • FIG. 8 is a schematic diagram of a blower in Example 3 in another angle of view
  • FIG. 9 is an exploded view of a blower in Example 3.
  • FIG. 10 is a front view of a blower in Example 3.
  • FIG. 11 is a sectional view taken from line C-C in FIG. 10 .
  • a vent pipe comprising a top plate 1 ; two side plates 2 ; and a base plate 3 ; and an air channel 4 formed by the top plate 1 , the two side plates 2 , and the base plate 3 .
  • the air channel 4 comprises a first air inlet 41 and a first air outlet 42 .
  • the base plate 3 comprises an air deflector 31 disposed at the first air outlet 42 .
  • the air deflector 31 is perpendicular to the base plate 3 .
  • One end of the base plate 3 extends out of the air channel 4 to form an extension plate 32 , and the air deflector 31 is disposed on the extension plate 32 .
  • the two side plates 2 are integrated with the top plate 1 .
  • the lower ends of the two side plates 2 bend away from the air channel to form convex flanges 21 ; two sides of the base plate 3 extend to form clamping units 33 ; and the convex flanges 21 are clamped by the clamping units 33 .
  • the air channel 4 is rectangular in shape.
  • the air deflector 31 is disposed in the air channel 4 , as shown in FIG. 6 .
  • a blower comprises a motor 5 , a volute 6 , a blade wheel 7 , and the aforesaid vent pipe.
  • the volute 6 comprises a chamber 61 and the blade wheel 7 is disposed in the chamber 61 ; the volute 6 comprises a second air inlet 62 and a second air outlet 63 both communicating with the chamber 61 ; the motor is disposed on the volute 6 ; and the vent pipe communicates with the second air outlet 63 .
  • the vent pipe is integrated with the volute or fixed on the volute via bolts.
  • the first air inlet 41 of the vent pipe is provided with a first screw hole 8
  • the second air outlet 63 of the volute 6 is provided with a second screw hole 8
  • the first air inlet 41 of the exhaust extension pipe and the second air outlet 63 of the volute are tightly connected by the bolts 9 .
  • the volute 6 comprises a top surface provided with a plurality of mounting holes 64 ; a mounting plate 65 is fixed on the top surface via the plurality of mounting holes 64 and comprises a through hole 66 ; the motor 5 is disposed on the mounting plate 65 and comprises a revolving shaft 51 ; the front end of the revolving shaft 51 of the motor 5 passes through the through hole 66 of the mounting plate 65 to connect to the blade wheel 7 in the chamber 61 .
  • the air channel 4 formed by the top plate 1 , the two side plates 2 , and the base plate 3 comprises the first air inlet 41 and the first air outlet 42 ;
  • the base plate 3 comprises the air deflector 31 disposed at the first air outlet 42 ;
  • the volute 6 comprises a second air inlet 62 and a second air outlet 63 , and the vent pipe communicates with the second air outlet 63 , so that the air volume and static pressure in the vent pipe are adjustable.
  • the air deflector 31 is perpendicular to the base plate 3 .
  • the design is cost-effective.
  • the air deflector 31 is disposed in the air channel 4 or on an extension plate 32 of the base plate 3 , so it is flexible in arrangement.
  • the lower ends of the two side plates 2 bend away from the air channel to form convex flanges 21 ; two sides of the base plate 3 extend to form clamping units 33 ; and the convex flanges 21 are clamped by the clamping units 33 .
  • the connection of the base plate 3 and the two side plates 2 is reliable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A vent pipe, including: a top plate; two side plates; a base plate; and an air channel formed by the top plate, the two side plates, and the base plate; and an air deflector. The air channel includes a first air inlet and a first air outlet. The air deflector is disposed on the base plate and located on one side of the first air outlet. Also provided is a blower, including a motor; a volute; a blade wheel; and the vent pipe. The volute includes a chamber and the blade wheel is disposed in the chamber. The volute includes a second air inlet and a second air outlet both communicating with the chamber. The motor is disposed on the volute. The vent pipe communicates with the second air outlet.

Description

    CROSS-REFERENCE TO RELAYED APPLICATIONS
  • This application is a continuation-in-part of International Patent Application No. PCT/CN2017/077743 with an international filing date of Mar. 22, 2017, designating the United States, now pending, and further claims foreign priority benefits to Chinese Patent Application No. 201621462159.6 filed Dec. 29, 2016. The contents of all of the aforementioned applications, including any intervening amendments thereto, are incorporated herein by reference. Inquiries from the public to applicants or assignees concerning this document or the related applications should be directed to: Matthias Scholl PC., Attn.: Dr. Matthias Scholl Esq., 245 First Street, 18th Floor, Cambridge, Mass. 02142.
    • BACKGROUND
  • This disclosure relates to a vent pipe and a blower comprising the same.
  • Typically, a blower includes a motor, a volute including an air inlet and an air outlet, a blade wheel, and a vent pipe communicating with the air outlet. The vent pipe is composed of four flat plates, and the air volume and static pressure of the vent pipe cannot be adjustable.
    • SUMMARY
  • Disclosed is a vent pipe and a blower comprising the same. An air deflector is disposed in the vent pipe to adjust the air volume and static pressure in the vent pipe.
  • The disclosure provides a vent pipe, comprising: a top plate; two side plates; a base plate; an air channel formed by the top plate, the two side plates, and the base plate, and the air channel comprising a first air inlet and a first air outlet; and an air deflector disposed on the base plate and located on one side of the first air outlet.
  • The air deflector can be perpendicular to the base plate.
  • One end of the base plate can extend out of the air channel to form an extension plate, and the air deflector can be disposed on the extension plate.
  • The air deflector can be disposed in the air channel.
  • The two side plates can be integrated with the top plate.
  • The lower ends of the two side plates can bend away from the air channel to form convex flanges; two sides of the base plate can extend to form clamping units; and the convex flanges can be clamped by the clamping units.
  • The air channel can be rectangular in shape.
  • Also provided is a blower, comprising a motor; a volute; a blade wheel; and the aforesaid vent pipe. The volute comprises a chamber and the blade wheel is disposed in the chamber; the volute comprises a second air inlet and a second air outlet both communicating with the chamber; the motor is disposed on the volute; and the vent pipe communicates with the second air outlet.
  • The volute can comprise a top surface provided with a plurality of mounting holes; a mounting plate can be fixed on the top surface via the plurality of mounting holes and can comprise a through hole; the motor can be disposed on the mounting plate and can comprise a revolving shaft; the front end of the revolving shaft of the motor can pass through the through hole of the mounting plate to connect to the blade wheel in the chamber.
  • Advantages of the vent pipe and a blower comprising the same as described in the disclosure are summarized as follows.
  • 1. The base plate of the vent pipe is provided with an air deflector, so that the air volume and static pressure in the vent pipe are adjustable.
  • 2. The air deflector is perpendicular to the base plate. The design is cost-effective.
  • 3. The air deflector is disposed in the air channel or on an extension plate of the base plate. The arrangement is flexible.
  • 4. The lower ends of the two side plates are bent away from the air channel to form convex flanges; two sides of the base plate extend to form clamping units; and the convex flanges are clamped by the clamping units. The connection of the base plate and the two side plates is firm and reliable.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a schematic diagram of a vent pipe in Example 1;
  • FIG. 2 is an exploded view of a vent pipe in Example 1;
  • FIG. 3 is a front view of a vent pipe in Example 1;
  • FIG. 4 is a sectional view taken from line A-A in FIG. 3;
  • FIG. 5 is a sectional view taken from line B-B in FIG. 3;
  • FIG. 6 is a schematic diagram of a vent pipe in Example 2;
  • FIG. 7 is a schematic diagram of a blower in Example 3;
  • FIG. 8 is a schematic diagram of a blower in Example 3 in another angle of view;
  • FIG. 9 is an exploded view of a blower in Example 3;
  • FIG. 10 is a front view of a blower in Example 3; and
  • FIG. 11 is a sectional view taken from line C-C in FIG. 10.
    •  DETAILED DESCRIPTION
  • To further illustrate, embodiments detailing a vent pipe and a blower comprising the same are described below. It should be noted that the following embodiments are intended to describe and not to limit the disclosure.
  • As shown in FIGS. 1-5, provided is a vent pipe comprising a top plate 1; two side plates 2; and a base plate 3; and an air channel 4 formed by the top plate 1, the two side plates 2, and the base plate 3. The air channel 4 comprises a first air inlet 41 and a first air outlet 42. The base plate 3 comprises an air deflector 31 disposed at the first air outlet 42.
  • The air deflector 31 is perpendicular to the base plate 3.
  • One end of the base plate 3 extends out of the air channel 4 to form an extension plate 32, and the air deflector 31 is disposed on the extension plate 32.
  • The two side plates 2 are integrated with the top plate 1.
  • The lower ends of the two side plates 2 bend away from the air channel to form convex flanges 21; two sides of the base plate 3 extend to form clamping units 33; and the convex flanges 21 are clamped by the clamping units 33.
  • The air channel 4 is rectangular in shape.
  • Optionally, the air deflector 31 is disposed in the air channel 4, as shown in FIG. 6.
  • As shown in FIGS. 7-11, a blower comprises a motor 5, a volute 6, a blade wheel 7, and the aforesaid vent pipe. The volute 6 comprises a chamber 61 and the blade wheel 7 is disposed in the chamber 61; the volute 6 comprises a second air inlet 62 and a second air outlet 63 both communicating with the chamber 61; the motor is disposed on the volute 6; and the vent pipe communicates with the second air outlet 63. The vent pipe is integrated with the volute or fixed on the volute via bolts. For example, the first air inlet 41 of the vent pipe is provided with a first screw hole 8, the second air outlet 63 of the volute 6 is provided with a second screw hole 8, and the first air inlet 41 of the exhaust extension pipe and the second air outlet 63 of the volute are tightly connected by the bolts 9.
  • The volute 6 comprises a top surface provided with a plurality of mounting holes 64; a mounting plate 65 is fixed on the top surface via the plurality of mounting holes 64 and comprises a through hole 66; the motor 5 is disposed on the mounting plate 65 and comprises a revolving shaft 51; the front end of the revolving shaft 51 of the motor 5 passes through the through hole 66 of the mounting plate 65 to connect to the blade wheel 7 in the chamber 61.
  • Working principle: the air channel 4 formed by the top plate 1, the two side plates 2, and the base plate 3 comprises the first air inlet 41 and the first air outlet 42; the base plate 3 comprises the air deflector 31 disposed at the first air outlet 42; the volute 6 comprises a second air inlet 62 and a second air outlet 63, and the vent pipe communicates with the second air outlet 63, so that the air volume and static pressure in the vent pipe are adjustable. The air deflector 31 is perpendicular to the base plate 3. The design is cost-effective. The air deflector 31 is disposed in the air channel 4 or on an extension plate 32 of the base plate 3, so it is flexible in arrangement. The lower ends of the two side plates 2 bend away from the air channel to form convex flanges 21; two sides of the base plate 3 extend to form clamping units 33; and the convex flanges 21 are clamped by the clamping units 33. The connection of the base plate 3 and the two side plates 2 is reliable.
  • It will be obvious to those skilled in the art that changes and modifications may be made, and therefore, the aim in the appended claims is to cover all such changes and modifications.

Claims (18)

What is claimed is:
1. A vent pipe, comprising:
1) a top plate;
2) two side plates;
3) a base plate;
4) an air channel formed by the top plate, the two side plates, and the base plate, and the air channel comprising a first air inlet and a first air outlet; and
5) an air deflector disposed on the base plate and located on one side of the first air outlet.
2. The vent pipe of claim 1, wherein the air deflector is perpendicular to the base plate.
3. The vent pipe of claim 2, wherein one end of the base plate extends out of the air channel to form an extension plate, and the air deflector is disposed on the extension plate.
4. The vent pipe of claim 2, wherein the air deflector is disposed in the air channel.
5. The vent pipe of claim 1, wherein the two side plates are integrated with the top plate.
6. The vent pipe of claim 2, wherein the two side plates are integrated with the top plate.
7. The vent pipe of claim 3, wherein the two side plates are integrated with the top plate.
8. The vent pipe of claim 4, wherein the two side plates are integrated with the top plate.
9. The vent pipe of claim 5, wherein lower ends of the two side plates bend away from the air channel to form convex flanges; two sides of the base plate extend to form clamping units; and the convex flanges are clamped by the clamping units.
10. The vent pipe of claim 6, wherein lower ends of the two side plates bend away from the air channel to form convex flanges; two sides of the base plate extend to form clamping units; and the convex flanges are clamped by the clamping units.
11. The vent pipe of claim 7, wherein lower ends of the two side plates bend away from the air channel to form convex flanges; two sides of the base plate extend to form clamping units; and the convex flanges are clamped by the clamping units.
12. The vent pipe of claim 8, wherein lower ends of the two side plates bend away from the air channel to form convex flanges; two sides of the base plate extend to form clamping units; and the convex flanges are clamped by the clamping units.
13. The vent pipe of claim 9, wherein the air channel is rectangular in shape.
14. The vent pipe of claim 10, wherein the air channel is rectangular in shape.
15. The vent pipe of claim 11, wherein the air channel is rectangular in shape.
16. The vent pipe of claim 12, wherein the air channel is rectangular in shape.
17. A blower, comprising:
a motor;
a volute;
a blade wheel; and
a vent pipe of claim 1;
wherein:
the volute comprises a chamber and the blade wheel is disposed in the chamber;
the volute comprises a second air inlet and a second air outlet both communicating with the chamber;
the motor is disposed on the volute; and
the vent pipe communicates with the second air outlet.
18. The blower of claim 17, wherein:
the volute comprises a top surface provided with a plurality of mounting holes;
a mounting plate is fixed on the top surface via the plurality of mounting holes and comprises a through hole;
the motor is disposed on the mounting plate and comprises a revolving shaft;
a front end of the revolving shaft of the motor passes through the through hole of the mounting plate to connect to the blade wheel in the chamber.
US16/455,804 2016-12-29 2019-06-28 Vent pipe and blower comprising the same Abandoned US20190316792A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN201621462159.6 2016-12-29
CN201621462159.6U CN206360918U (en) 2016-12-29 2016-12-29 An exhaust extension pipe and its application blower
PCT/CN2017/077743 WO2018120453A1 (en) 2016-12-29 2017-03-22 Exhaust extension pipe, and blower applicable thereto

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2017/077743 Continuation-In-Part WO2018120453A1 (en) 2016-12-29 2017-03-22 Exhaust extension pipe, and blower applicable thereto

Publications (1)

Publication Number Publication Date
US20190316792A1 true US20190316792A1 (en) 2019-10-17

Family

ID=59377404

Family Applications (1)

Application Number Title Priority Date Filing Date
US16/455,804 Abandoned US20190316792A1 (en) 2016-12-29 2019-06-28 Vent pipe and blower comprising the same

Country Status (3)

Country Link
US (1) US20190316792A1 (en)
CN (1) CN206360918U (en)
WO (1) WO2018120453A1 (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2959116A (en) * 1958-07-08 1960-11-08 Air Devices Inc Air diffuser
DE4007416C2 (en) * 1990-03-09 1994-08-18 Mueller E Gmbh & Co Slit-shaped air outlet for a ventilation system
US8197193B2 (en) * 2008-05-02 2012-06-12 Unico, Inc. Air distribution blower housing with adjustable restriction
CN201448288U (en) * 2009-07-08 2010-05-05 中山大洋电机股份有限公司 Adapter and air blower applying same
JP6234468B2 (en) * 2013-10-10 2017-11-22 シャープ株式会社 Blower
US20160208815A1 (en) * 2015-01-20 2016-07-21 Ford Global Technologies, Llc Blower assembly for a vehicle
CN205717727U (en) * 2016-04-20 2016-11-23 中国海洋石油总公司 A kind of air-duct apparatus of scalable converter exhaust air rate
CN205779806U (en) * 2016-05-30 2016-12-07 中山大洋电机股份有限公司 A coil fan structure

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Publication number Publication date
CN206360918U (en) 2017-07-28
WO2018120453A1 (en) 2018-07-05

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