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Publication numberUS2603157 A
Publication typeGrant
Publication dateJul 15, 1952
Filing dateSep 7, 1948
Priority dateSep 7, 1948
Publication numberUS 2603157 A, US 2603157A, US-A-2603157, US2603157 A, US2603157A
InventorsConery William J
Original AssigneeF E Myers & Bro Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Double rotary jet pump
US 2603157 A
Abstract  available in
Images(2)
Previous page
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Claims  available in
Description  (OCR text may contain errors)

July 15, i952 w. J. coNERY 2,603,157

DOUBLE ROTARY JET PUMP Filed Sept. '7, 1948 2 S-lEETS-SHEET 1 DOUBLE ROTARY JET PUMP Filed sept. 7, 1948 2 SHEETS-SHEET 2 5 o s'. l IE] El I 9 J INVENTOR WILLIAM J- CNERY BY .'Jarmlr f .7W

Patented July 15, 1952 UNITED STATES DOUBLE ROTARY JET PUMP William J. Conery, Ashland, Ohio, assignor to The F. E. Myers & Bro. Co., Ashland, Ohio, a

corporation of Ohio Application September 7, 1948,-Serial No. 47,984

3 Claims. (Ol. 10S-5) The present invention relates to pumps and is concerned primarily with a double rotary jet pump.

At the present time the use of jet pumps for raising water out of wells is widespread; Such a pump operates on the principle of building up pressure on a stream of water that is directed downwardly to a desired level within thewell, whereupon it is expelled through a nozzle that cooperates with a venturi, whereupon water from the well is entrained and carried upwardly in a return pipe.

Jet pumps operating on this general principle are well known and extensively used. However, the present invention proposes certain improvements in a pump oi this type with practical advantages attaching thereto.

The presence of air in a pump of this type has been a disturbing factor. It is desirable to pump air from the discharge side of the pump into a water tank, because air under pressure in the tank is a desirable and necessary element. Hown ever, the presence of air in the lines to the jet in the well is extremely undesirable.

To the end of properly controlling this factor there have been lproposed various arrangements of air separation chambersA However, as yet none of these chambers have proven completely satisfactory in eliminating air in the system to the jet in the well and at the same time providing air on the discharge side.

The present invention has in view as its foremost objective the provision of a dual pump assembly comprising a discharge pump at one side and a jet supply pump on the other,v the two being driven from a common power source such as an electric motor. An air separation chamber is so associated with these pumps that it is on the suction sides of both pumps. By so locating the air separation chamber provision is made for drawing substantially all the air ytherefrom off to the discharge pump and thence to the water tank, while the water which is forced down to the jet in the well is substantially free of air.

More in detail, the invention has as an object the provision of a dual pump of the type indicated which includes a discharge pump at one end and a jet supply pump assembly at the other. Associated with this jet supply pump assembly is an air separation chamber. A conduit connects this separation chamber with the suction side of the discharge pump, while another port provides communication with the suction side of the jet supply pump.

As above explained the optimum condition which may be achieved is when all of the air from the air separation chamber is pumped over to the discharge pump.

With this thought in mind, another object of the invention is the provision of a pump assembly of the character aforesaid, in which the air separation chamber is formed with a port at its uppermost point, and to which port is connected the conduit leading to the discharge pump. The location of this connection at the top has proven to be extremely effective in providing the transfer of air in the manner intended.

Still another object of the invention is the provision of a dual pump assembly of the type above noted in which the return line from the jet inthe well is connected to the air separation chamber at a port in close proximity to the port at the top which communicates with the pump on the discharge side. This, arrangement further enhances theseparating action in the air separation chamber so as to insure that practically nothing but water goes down to the jet in the well with all the air being pumped over to the discharge pump.

Various other more detailed objects and advantages of the invention such as arise in connection with carrying out the above noted ideas in a practical embodiment will in part become apparent and'partly hereinafter stated as the description of the invention proceeds.

The invention, therefore, comprises a dual pump assembly comprising a discharge pump, a jet supply pump, power means for driving both ofsaid pumps, an air separation chamber on the suction sides of both pumps and formed with a rport at the top establishing communication between the air separation chamber and the discharge pump. The return line from the jet in the well is connected tothe air separation chamber in close proximity to this port that communicates with the discharge pump.

For a full and more completeunderstanding of the invention reference may be had to the iollowing description and accompanying drawings wherein:

Figure l is a side view mostly in elevation but with parts broken away and shown in section of a dual pump assembly designed in accordance with the precepts of rthis invention;

Figure 2 is a view in end elevation of the pump shown in Figure l looking at the right hand end thereof;

Figure 3 is a view similar to Figure 1 in that it isv partly in elevation and partly in section of one modification;

Figure 4 is a view of an end elevation of the pump shown in Figure 3;

Figure 5 is another side view partly in elevation and partly in section of still another modification; and

Figure 6 is an end elevation of the pump shown in Figure 5.

Preferred embodiment Referring now to the drawings wherein like reference characters denote corresponding parts, and first more particularly to Figures 1 and 2I a preferred embodiment of the invention will be described.

A base is represented at IQ and this base is adapted to rest on any appropriate supporting surface. Upstanding from the base i6 is a piede"- tal which carries a casing |2 which houses an electricmotor represented at I3. The particular type of motor employed is not a part of this invention and any of the known motors which will accomplish the work required of it will prove to be adequate.

The motor I3 includes a drive shaft I4 which projects outwardly from each side thereof and from which power is taken in driving the pumps now to be described.

Speaking with reference to the showing in Figure 1, mounted on the left hand side of the casing I2 is a discharge pump assembly which is referred to in its entirety by the reference character D. This pump assembly D consists of the following elements:

The casing I2 includes an end wall I5 having an offset portion I6 that is deformed in the di rection of the motor I3 to provide a conical wall section I 'I that terminates at its smaller end in a flat I8 formed with an opening which receives one end of the motor shaft I4. It will be noted that the offset portion I6 is of a thickened construction and is provided with a plurality of ports I9 for apuinp to be later described.

Secured to this wall section I1 in any preferred manner, such as by the fastening elements indicated at 26, is a conical plate 2| having a flange 22 which overlies and is secured to the wall section Il by the fasteners 2i). The smaller end of this conical plate terminates in a tube 23 having an inwardly extending frange or lip 24. It will be evident that the conical wall and conical plate 2| cooperate to define a chamber 25 which is identified as the impeller chamber.

A centrifugal impeller 23 is rotatably mounted in the chamber 25. It will be noted that this impeller 23 includes a central hub portion 21 to which the end of the shaft I4 is anchored and a tubular hub 28 is received in the flange 24. The main body of the impeller 26 is formed with passages 29 that communicate with the bore of the hub 28 and tube 23. A seal of a type that is well known in this art is shown at 3D and is included for the purpose of preventing water from leaking out of the chamber along the shaft |4.

An end casing member 3| may be mounted on the end of the'casing I2 in any preferred marmer such as by being bolted thereto (not illustrated) This end casing member 3| is formed with an inner ring-like wall 32 which is fitted the annular groove defined by wall sections l5 and i5 of the casing l2. The end casing 3i defines a discharge chamber 33 which communicates with the passages I 9. The casing 3| is formed with a port 34 to which is connected a conduit 35 that extends to a water tank that is to be filled with water under air pressure.

Extending inwardly from the curved end wall of the casing 3| and into the chamber 33 is a tubular stub 36 the end face of which is formed with an annular groove 3l which receives the end of the tube 23. Communicating with the tubular stub 36 is a threaded port 38 into which is threaded a tting 39. It is evident that this fitting 33 communicates through the tubular stub 36, tube 23, and member 28 with the suction side of the impeller 26.

Referring now more particularly to the right hand side of Figure 1, a jet supply pump is shown vas attached to that end of the casing I 2, and

this jet supply pump is referred to in its entirety by the reference character J. The casing I2 carries a wall structure which is a duplicate of that described at the discharge pump D. It is believed to be unnecessary to here repeat the details of this construction. It suilices to point out that an impeller 40 is rotatably mounted in an impeller chamber 4| on one end of the motor drive shaft |4. The impeller 40 includes passages 42, while passages 43 communicate with the impeller chamber 4|.

An end casing member defined by a cylindrical wall 44 and a curved end wall 45 which is integrally joined to the wall 44, is mounted on the casing I2 in a manner corresponding to the mounting of the casing 3|. This end casing member also includes a vertical partition 46 that extends downwardly from the cylindrical wall 44 to which it is integrally connected with a horizontal partition 4'! integrally joining the inner edge of the vertical partition 46 with the curved wall 45. This vertical partition 46 is formed with a port at 48 that communicates with the suction side of the impeller 40. The partitions 46 and 41, cylindrical wall 44, and end wall 45, together define an air separation chamber 43 and a baille 50 extends inwardly into the chamber 49 from the partition 45 with which it is integrally formed.

At the uppermost point of the chamber 49 the cylindrical wall 44 is formed with a threaded port 5| into which is screwed a fitting 52. A conduit 53 connects with fittings 39 and 52. In close proximity to this threaded port 5| the wall of the chamber 48 is formed with another port 54 to which is connected a conduit 55 which constitutes the return side of a jet system that eX- tends down into a well.

Such jet systems are well known and a conventional type has been shown in Fig. 1 for connection 'to the conduits 55 and 58. It suflices to point out that the water is returned from the well by the jet at the port 54 where it is introduced into the air separation chamber 43.

The end casing 44 also defines a pressure chamber 56 with which the passages 43 communicate. This chamber 56 is formed with a port 51 to which a conduit 58 is connected. The conduit 58 is a part of the jet system and extends down into the well.

The partition 46 is formed with a vent port at 5 which will evacuate any air which might accumulate in the pressure chamber 56 and permit such air to pass to the air separation chamber 4S.

Operation In outlining the operation of the mechanism above described, it will be assumed that the motor I3 drives the motor shaft I4. This rotates the impellers 26 and 4S on the opposite ends thereof. As the impeller is rotated water is drawn from the air separation chamber 49 through the port 48 into the suction side of the impeller 40. As the latter rotates the water is expelled under increased pressure through the passages 42 and 43 into the pressure chamber 55. The pressure which has been built up on the water forces it through the port 51 into the conduit 58 and thence down into the jet in the well. The nozzle of the jet cooperates with a venturi and as the water is expelled from the nozzle it entrains water from the well and this combined water is carried upwardly through the return pipe from which it is introduced through the port 54 into the air separation chamber 49. As much Water as is required to operate the jet system will then be again taken through the cycle that is just described. However, the additional water which is picked up by the jet in the Well, together with any air which may be present in the air separation chamber, is drawn through the port 5l into the fitting 52 and through the conduit 53 over to the fitting 39 from which it passes into the suction side of the impeller 2B.

It is to be remembered that the latter is continuously rotating and creates the suction which will draw the water and air over from the air separation chamber 49. Ihe impeller 26 forces the water under increased pressure out through the 1 passages 29 and I9 into the discharge chamber 33. From the latter Water passes through port 34 and conduit 35 to the water tank (not illustrated).y

An appreciable amount of air will be entrained in this water, but this is a highly desirable factor on the discharge side because it is necessary that the tank include air under pressure so as to properly expel the water therefrom as it is to be used.

It will be noted that the double rotary pump assembly above described embodies the following novel characteristic features:

(a) The air separation chamber 49 is on the suction side of both the impellers 26 and 48.

(b) The port 5! which establishes communication between the air separation chamber and the impeller 25 of the discharge pump is at the top of the air separation chamber.

(c) The port 54 is in close proximity to the port 5I.

The above noted features cooperate with the baffle 50 to provide for a highly efficient separation of the air from the water. Substantially all the air passes out through the port 5|, while possibly nothing but water passes through the port 48 to the jet supply pump impeller 40.

First modification Referring now more particularly to Figures 3 and 4, a somewhat modified form of the invention will be described.

In this form of the invention both the discharge and jet supply pumps are located at the same end of the motor shaft. The electric motor vI 3 is shown as mounted on the usual base lf3 and has a drive shaft 59 projecting outwardly from one end thereof. Secured to the motor casing in any preferred manner, such as by the bolts shown at 60, is a cylindrical pump casing 6l having end flanges 62 and 63. This casing 6l carries a p-artition 84 of the irregular formation illustrated in Figure 3 and which partition is preferably integrally joined to the cylindrical wall of the casing. This partition 64 is formed with a central port 65.

The partition 64, together with the cylindrical Wall BI and the end Wall of the motor casing define an air separation chamber 66. A baffle 61 is carried by the partition 64 and is formed with an opening through which the shaft 59 passes. It will be noted that this baflie 61 shields the opening 65. The cylindrical casing 6l is formed with a port 68 at the top of the air separation chamber 66. A fitting 69 is screwed into this port. The cylindrical wall 6| is also formed with another port 10 in close proximity to the port 68 and with which communicates a conduit 1| that is connected to the return side of the jet system in the well.

Enclosed Within the end flange 63 is a dividing `plate 12 which, together with the partition 64,

defines a pressure chamber 13. A vent port 8 is formed in the partition 64 to evacuate any air which might accumulate in the pressure chamber 13 to the air separation chamber 65. The cylindrical casing 6l is formed with a port at 14 which communicates with the pressure chamber13 and to which is connected a conduit 15 that is on the pressure side of the jet system in l the well. Y

The shaft 59 passes through an opening in the plate 12 and between the partition 54 and plate 12 carries a centrifugal impeller 16. The latter is mounted in a chamber 11 that is defined by the dividing plate 12 and a conical plate 18. Ports 19 establish communication between the impeller chamber 11 and pressure chamber 13. The impeller 15 may be identified as the jet supply pump because it is the impeller which provides the necessary pressure on the water going to the jet system in the well.

An end casing member made up of a cylindrical Wall 89 and a somewhat irregular shaped curved wall 8| is mounted on the end of the casing 6I having a ring-like end flange 82 which abuts the ange B3 and to which it may be connected in any preferred manner. This end casing 8| carries a partition 83 which marks off on one side a discharge chamber 84 and on the other side an inlet chamber 85. This partition 83 is formed with a port 85 that communicates with the inlet chamber 85 and yalso the suction side of a centrifugal impeller 81. The latter is mounted in an impeller chamber 88 on the end ofv the shaft 59. The impeller chamber 881s dened by a dividing plate 12 and a conical plate 89. Passages 99 communicate between the impeller chamber 88 and thedischarge chamber 84. The cylindrical Wall is formed with a threaded port 9i that communicates with the discharge chamber 84 and to which is connected a conduit 92 that extends to a water tank (not illustrated) Another threaded port 93 communicatesk with the inlet chamber and a fitting 94 is screwed into this port. A cordlt 95 is connected between the fittings 69 an Operation first modification While the operation of the modification shown in Figures 3 and 4 is substantially the same as that for the form-shown in Figures 1 and 2, it may be brieily described by noting that as the motor drives the shaft 59 both the impellers 15 and 81 are rotated. The impeller 18 draws in water through the port 65 fronithe air separation chamber 56 and builds up pressure on this water. The water is forced through port 14 into pipe 15 and thence down to the jet system in the well. The jet pump entrains water from the well which, together with the water from the jet supchamber 85 through port 89 into theimpeller. A

The impeller builds up pressure on the water as it is transferred to the discharge chamber 84 from which it passes through port 9| and conduit 92 to the water tank.

Again it is noted that the pump described embraces the following novel features which are characteristic of this invention:

(a) Air separation chamber 66 is on the suction sides of both the impellers T6 and 81.

(b) Port G8 is at the top of the air separation chamber 66.

(c) Port I is in close proximity to the port 68. These features combine to cooperate with the baille 61 in insuring that only water goes to the jet system with substantially all the air being drawn to the discharge side with the water.

Second modification Referring now to Figures 5 and 6, a second modified form of the invention will be described. The motor I3 is mounted on its base I0 in the usual manner and provides a motor drive shaft 96.

lThe motor casing which is represented at I2 has substantially the same construction as either end of the motor casing described in connection with Figures l and 2.

It suffices to point out that the end wall of this casing, together with a conical plate 97, define an an ilnpeller chamber 98 in which rota-tes an impeller 99 that is drivably mounted on the shaft 96. A cylindrical casing lili! has an end flange IUI which abuts the end flange l5 on the casing |2 and to which it is secured in any preferred manner.

rlhe cylindrical casing 05) carries an irregularly shaped partition Itwhich, together with an end wall |03, denes an air separation chamber |04.

The cylindrical 4wall It is formed with a port |35 which communicates with the chamber |04 and with which communicates a conduit |06 on the return side of the jet system. The partition |02 is formed with an opening |01! through which the shaft 96 passes and which also acts as the means of communication between the air separation chamber |94 and the suction side of the impeller 99. The end wall |93 is formed with another opening |69 through which the shaft 96 passes and which also acts as a means of communication between the air separation chamber I0@ and a second impeller to be later described.

The partition |02, together with the cylindrical casing |00, denne a pressure chamber |09. A vent port 'I is formed in partition |02 to evacuate any air which might accumulate in the pressure chamber |09 to the air separation chamber Ili. rihe cylindrical wall |00 is formed -with a port IIB which communicates with the pressure chamber |09 and to which is connected a conduct that goes to the pressure side of the jet system. Passages ||2 establish communication between the impeller chamber 93 and the pressure chamber |99.

The cylindrical `casing |00 is continued be- 8 yond the end Wall |03 an appreciable distance where it is formed with an in-turned end ange |I3. Mounted on this end flange ||3 is an end closure member III having a central conical wall section ||5 terminating in a at IIS. A conical plate II'I is anchored to this end closure member ||4 and has a tubular extension ||8 that is imbedded in the end wall |03. The plate I 'I and wall sections ||5 and I6 together deine an impeller chamber ||9. The casing |00, together with the end flange ||3 and plate II'I, denne a discharge chamber |20. Radial passages |2| communicate between the impeller chamber H9 and discharge chamber |20. The motor shaft 95 projects into the impeller chamber ||9 and an impeller |22 is drivably mounted thereon for rotation in the impeller chamber. The port |08 in the end wallvv |03 establishes communication between the suction side of the impeller |22 and the air separation chamber IEII'I.` The casing |00 is formed with a threaded port at |23 that communicates with the discharge chamber |20 and to which is connected a conduit |24 that extends to the water tank.

Operation second modification The operation of the form of the invention depicted in Figures 5 and 6 is substantially the same as that above described in connection with the other two forms. It may be briefly outlined by noting that as the motor shaft 96 rotates both impellers 99 and |22 are driven. rihe impeller 99 draws water from the separation chamber |04 through the opening |01. As the impeller operates water under increased pressure is expelled through passages I|2 into the pressure chamber |09. VThe water under pressure is forced through port IIG into pipe and thence down into the jet system. The nozzle cooperating with the Venturi entrains additional water from the well and this water is introduced into the air separation chamber |04 through the return pipe |06 and port |05. As much water as is used in the jet system is now returned to this cycle which is repeated. The water which is picked up from the well, together with any air, is drawn through the opening |08 by the impeller |22. The latter builds up pressure on the water and air which is expelled through passages |2| into the discharge chamber |20. From the latter the water passes through port |23 and conduit |24 to the water tank.

The pump illustrated in Figures 5 and 6 embraces the novel characteristic feature of having the air separation chamber |94 on the suction side of both the impellers 99 and |22. This insures of efcient separation of the air so that substantially nothing but Water goes down to the jet system.

While preferred specific embodiments of the invention are hereinbefore set forth, it is to be clearly understood that the invention is not to be limited to the exact constructions, mechanisms, and devices illustrated and described, because various modifications of these details may be provided in putting the invention into practice within the purview of the appended claims.

I claim:

l.. A pumping apparatus for water wells, said apparatusincluding a jet pump positioned in the well to entrain the water therefrom, in combination, a driving device with a horizontal shaft, a jet supply pump for activating the jet and a discharge supply pump for delivering service water under pressure, said supply pumps being contained in the same housing and include impellers mounted on said shaft, said impellers having centrally disposed suction openings and peripherally disposed discharge openings, an air separating chamber formed within the same housing as the jet supply and discharge supply pumps, but separated from the discharge supply pump, said chamber communicating with the suction opening of the jet supply pump, the top portion of said chamber being positioned above the last mentioned suction opening and adapted to collect separated air, a suction pipe from said jet pump entering said chamber at the top portion thereof, and a conduit extending from the chamber near said suction pipe to the suction opening of the discharge supply pump whereby the air separating chamber is in communication with said last mentioned suction opening, discharge chambers surrounding said impellers and communicating with the peripherally disposed discharge openings thereof, and pressure discharge pipes extending respectively from said discharge chambers, said jet supply pump communicating with the jet pump in the well.

2. A pumping apparatus for Water wells, said apparatus including a jet pump positioned in the well to entrain the water therefrom, in combination, a driving device with a horizontal shaft, a jet supply pump for activating the jet, and a discharge supply pump for delivering service water under pressure, said supply pumps being contained in the same housing and include impellers mounted on said shaft at opposite sides of said driving device, said impellers having centrally disposed suction openings presented away from said driving device, and having peripherally disposed discharge openings presented radially outward with respect to said device, an air separating chamber formed within the same housing as the jet supply and discharge supply pumps, but separated from the discharge supply pump, said chamber communicating with the suction opening of the jet supply pump, the top portion of said chamber being positioned above the last mentioned suction opening and adapted to collect separated air, a suction pipe from said jet pump entering said chamber at said top portion thereof, and a conduit extending from the chamber near said suction pipe to the suction opening of the discharge supply pump, whereby the air separating chamber and the body of separated air at the top of the chamber are in communication with said last mentioned suction opening, a discharge chamber surrounding said impellers to receive the discharge from the peripherally disposed openings thereof, a pressure discharge pipe extending from the lower portion of the discharge chamber of the jet supply pump and communicating with the jet pump in the well, and a pressure discharge pipe extending from the upper portion of the discharge chamber of the discharge supply pump,

3. A pumping apparatus for water wells, said apparatus including a jet pump positioned in the well to entrain the water therefrom, in combination, a driving device with a horizontal shaft, a jet supply pump for activating the jet of said jet pump, a discharge supply pump for delivering service waterunder pressure, said supply pumps being contained in the same housing and include impellers mounted on said shaft, said impellers having centrally disposed suction openings and peripherally disposed discharge openings, an air separating chamber formed within the same housing as the jet supply and discharge supply pumps but separated from the discharge supply pump, said chamber communicating with the suction opening of the jet supply pump, said chamber being positioned substantially entirely above the lower edge of the suction opening of the jet supply pump, whereby the top of the chamber is positioned above the last mentioned f suction opening and is adapted to collect separated air at a position remote from said suction opening, a suction pipe from said jet pump entering said chamber at the top portion thereof, a conduit extending from the top of said chamber to the suction opening of the discharge supply` pump whereby the air separating chamber is in communication with said last mentioned suction opening, discharge chambers surrounding said impellers and communicating with the peripherally disposed discharge openings thereof, a pressure pipe extending from the lower portion of the discharge chamber of the jet supply pump and communicating with the jet pump in the well, and a pressure discharge pipe to a service tank extending from the upper portion of the discharge chamber of the discharge supply pump.

WILLIAM J. CONERY.

REFERENCES CITED The following references are of record in the nie of this patent:

Great Britain 1932

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2691346 *Sep 7, 1948Oct 12, 1954F E Myers & Bro CoDouble rotary fluid pump
US2700343 *May 11, 1950Jan 25, 1955Pezzillo Jr Albert RMotor pump unit
US2735367 *Jun 10, 1952Feb 21, 1956Alliskenney
US2775204 *Mar 23, 1953Dec 25, 1956Roper Corp Geo DDual pump drive with overrunning clutches
US3149571 *Dec 11, 1959Sep 22, 1964Victoria NicholsDeep well liquid removal system
US3195468 *May 10, 1963Jul 20, 1965 Submersible pump
US3410218 *Jun 8, 1967Nov 12, 1968Int Standard Electric CorpMotor pump unit
US4294573 *May 17, 1979Oct 13, 1981Kobe, Inc.Submersible electrically powered centrifugal and jet pump assembly
US6471493 *Jan 23, 2001Oct 29, 2002Lg Electronics Inc.Assembly structure for a turbo compressor
US7125219 *Nov 11, 2002Oct 24, 2006Flakt Woods AbHigh-pressure fan
US8499760 *Jul 6, 2012Aug 6, 2013Resmed LimitedDouble-ended blower and volutes therefor
US20040247432 *Nov 11, 2002Dec 9, 2004Dan SarinHigh-pressure fan
US20120266887 *Jul 6, 2012Oct 25, 2012Resmed LimitedDouble-ended blower and volutes therefor
Classifications
U.S. Classification417/81, 415/101, 417/350
International ClassificationF04D9/06, F04D9/00
Cooperative ClassificationF04D9/06
European ClassificationF04D9/06