CN112729445A

CN112729445A - Water meter and use method thereof

Info

Publication number: CN112729445A
Application number: CN202110106269.8A
Authority: CN
Inventors: 纪德江
Original assignee: Shuyang Yicai Foam Plastic Co ltd
Current assignee: Ningbo Donghai Group Corp
Priority date: 2021-01-26
Filing date: 2021-01-26
Publication date: 2021-04-30
Anticipated expiration: 2041-01-26
Also published as: CN112729445B

Abstract

The invention provides a water meter and a using method thereof, wherein the water meter comprises: a cavity is arranged in the shell, a water inlet and a water outlet which are communicated with the cavity are respectively arranged at the two ends of the cavity, and a sealing hole is arranged at the bottom of the cavity; the filter assembly, it includes filter screen and driving piece to filter the piece, the interval is equipped with a plurality of filtration passageways on the filter screen, the filter screen sets up in the cavity, the filter screen shelters from in the water inlet, and at least partial filtration passageway is linked together with the water inlet in order to filter the liquid that gets into the cavity, driving piece sealing connection is in sealed hole, the one end of driving piece is located the outside of casing, the other end of driving piece can cooperate with the filter screen, rotate the driving piece in order to drive the filter screen at the cavity internal. The relative position of the water inlet and the filter screen is changed by rotating the filter screen, so that after the filter channels on part of the filter screen are blocked, the filter screen can be rotated to enable the part of the filter channels which are not blocked to correspond to the water inlet, and the liquidity of the liquid is ensured.

Description

Water meter and use method thereof

Technical Field

The invention relates to a water meter and a using method thereof.

Background

Among the correlation technique, be equipped with the filter screen in the water gauge to impurity in the filtration rivers, thereby avoid impurity to get into in the water gauge, but the water gauge uses the back for a long time, on the filter screen with the corresponding partial mesh of water inlet is blockked up by impurity easily, thereby influence the flow of rivers, lead to the rivers velocity of flow to reduce, the water gauge has the characteristic that can not dismantle at will moreover, thereby after partial mesh on the filter screen is plugged up, can only change the water gauge, thereby the waste of resource has been caused.

Disclosure of Invention

The invention aims to provide a water meter to ensure the fluidity of water flow.

The above object of the present invention can be achieved by the following technical solutions:

the invention provides a water meter, comprising:

the water-saving device comprises a shell, wherein a cavity is arranged in the shell, a water inlet and a water outlet which are communicated with the cavity are respectively arranged at two ends of the cavity, and a sealing hole communicated with the outside is arranged at the bottom of the cavity;

the filter component comprises a filter screen and a driving part, a plurality of filter channels are arranged on the filter screen at intervals, the filter screen is arranged in the cavity, the filter screen is shielded at the water inlet, at least part of the filter channels are communicated with the water inlet to filter liquid entering the cavity, the driving part is hermetically connected with the sealing hole, one end of the driving part is positioned outside the shell, the other end of the driving part can be matched with the filter screen, and the driving part is rotated to drive the filter screen to rotate in the cavity;

the rectifying piece is used for carding the flowing direction of liquid in the cavity, is arranged in the cavity and is positioned above the filter screen, and is provided with a rectifying cavity;

the impeller is rotatably arranged in the rectifying cavity.

In some embodiments of the present invention, the filter screen comprises a first screen body and a second screen body, the filter passage comprises a first filter hole disposed on the first screen body and a second filter hole disposed on the second screen body;

the first net body is rotatably connected in the cavity, the second net body is rotatably connected in the first net body, and the driving piece is switchably matched with the first net body and the second net body to respectively drive the first net body and the second net body to rotate.

In some embodiments of the invention, the diameter of the first filtering hole is larger than that of the second filtering hole, and a storage cavity is defined between the first net body and the second net body.

In some embodiments of the present invention, the driving member comprises a driving member, and the driving member is provided with a first gear and a second gear at intervals;

the bottom of the first net body is provided with a through hole, a first matching gear is arranged in the through hole, a second matching gear is arranged at the bottom of the second net body, and the driving piece is moved to enable the first gear to be meshed with the first matching gear or the second gear to be meshed with the second matching gear.

In some embodiments of the invention, the first mating gear is disposed around the first gear and the second mating gear is disposed around the second gear.

In some embodiments of the present invention, a protective sleeve is disposed at a bottom of the second net body, the protective sleeve is disposed around the second matching gear, a first limit protruding ring is disposed in the protective sleeve, the first limit protruding ring is located between the first matching gear and the second matching gear, and the first matching gear and the first gear are engaged and matched in a state where the second gear is stopped against the first limit protruding ring.

In some embodiments of the present invention, a sealing sleeve is disposed at the bottom of the cavity, the driving member is disposed in the sealing sleeve, and a lip-shaped sealing ring is disposed between the sealing sleeve and the driving member.

In some embodiments of the present invention, a second limit protruding ring is disposed on the driving member, and the driving member is matched with the filter screen when the driving member is moved to make the second limit protruding ring stop against the seal sleeve.

In some embodiments of the present invention, the sealing device further includes a sealing cover covering the sealing hole, one end of the sealing cover is rotatably connected to the housing, the other end of the sealing cover is detachably connected to the housing, and a sealing ring surrounding the sealing hole is disposed between the sealing cover and the housing.

The invention also provides a use method of the water meter in any one of the above embodiments, which comprises the following steps;

filtering water, wherein at least part of the filtering channels on the filtering screen are communicated with the water inlet by shielding the filtering screen from the water inlet so as to filter liquid entering the cavity;

rectifying, wherein liquid filtered by the filter screen enters the cavity, the liquid in the cavity is rectified by the rectifying part and then enters the rectifying cavity, and the rectified liquid in the rectifying cavity drives the impeller to rotate;

and changing the position, moving the driving part to enable the driving part to be matched with the filter screen, rotating the driving part to drive the filter screen to rotate in the cavity, and replacing at least part of the filter channel on the filter screen to be communicated with the water inlet.

The water meter of the invention has the characteristics and advantages that: because the partial filtering channel of the filter screen is communicated with the water inlet, the liquid entering the water meter through the water inlet enters the cavity after being filtered by the filter screen, impurities in the liquid are isolated outside the filter screen, the impurities in the liquid are prevented from entering the water meter to damage parts in the water meter, the liquid entering the cavity enters the rectifying cavity after being rectified by the rectifying part, and the liquid in the rectifying cavity flows to drive the impeller to rotate, so that the purpose of measuring the flow of the water is achieved.

After the water gauge is used for a long time, impurity can block in the partial filtering channel that is linked together with the water inlet, at this moment, can remove the driving piece earlier, make driving piece and filter screen cooperate, rotate the driving piece again in order to drive the filter screen at the cavity internal rotation, so that the partial filtering channel that is blocked rotates to not corresponding with the water inlet, thereby make on the filter screen not corresponding with the water inlet by the partial filtering channel of shutoff, so that liquid flows when passing through the filter screen, can not influence the mobility of liquid because of partial filtering channel shutoff, and the water gauge can avoid needing to be changed because filtering the channel shutoff, thereby prolong the life of water gauge, avoid the waste of resource.

In conclusion, the relative position of the water inlet and the filter screen is changed by rotating the filter screen, so that after the filter channels on part of the filter screen are blocked, the filter screen can be rotated to enable the part of the filter channels which are not blocked to correspond to the water inlet, and the liquidity of the liquid is ensured.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Figure 1 is an exploded view of a water meter according to an embodiment of the present invention;

figure 2 is a cross-sectional view of a water meter according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of the water meter with the housing and filter assembly separated according to an embodiment of the present invention;

figure 4 is a cross-sectional view of a water meter according to further embodiments of the present invention;

figure 5 is a cross-sectional view of the water meter with the drive member and the second mesh body engaged according to an embodiment of the present invention;

figure 6 is a cross-sectional view of the water meter with the drive member and the first mesh body engaged according to an embodiment of the present invention;

FIG. 7 is an enlarged view of a portion of FIG. 6 at A;

fig. 8 is a partial enlarged view of fig. 6 at B.

The reference numbers illustrate:

1. a housing; 11. a cavity; 12. a water inlet; 13. a water outlet; 14. sealing the hole;

2. a filter assembly; 21. a filter screen; 211. a filtration channel; 212. a first net body; 2121. a first filtering hole; 2122. a first mating gear; 213. a second mesh body; 2131. a second filtering hole; 2132. a second mating gear; 22. a drive member; 221. a first gear; 222. a second gear; 23. a protective sleeve; 231. a first limit convex ring; 24. sealing sleeves; 241. a lip-shaped seal ring;

3. a fairing;

4. an impeller;

5. a sealing cover; 51. and (4) a sealing ring.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 8, the present invention provides a water meter, including: the water-saving device comprises a shell 1, wherein a cavity 11 is arranged in the shell 1, a water inlet 12 and a water outlet 13 which are communicated with the cavity 11 are respectively arranged at two ends of the cavity 11, and a sealing hole 14 communicated with the outside is arranged at the bottom of the cavity 11; the filter component 2 comprises a filter screen 21 and a driving component 22, the filter screen 21 is provided with a plurality of filter channels 211 at intervals, the filter screen 21 is arranged in the cavity 11, the filter screen 21 is shielded from the water inlet 12, at least part of the filter channels 211 is communicated with the water inlet 12 to filter liquid entering the cavity 11, the driving component 22 is hermetically connected to the sealing hole 14, one end of the driving component 22 is positioned outside the shell 1, the other end of the driving component 22 can be matched with the filter screen 21, and the driving component 22 is rotated to drive the filter screen 21 to rotate in the cavity 11; the rectifying part 3 is used for carding the flowing direction of liquid in the cavity 11, the rectifying part 3 is arranged in the cavity 11, the rectifying part 3 is positioned above the filter screen 21, and the rectifying part 3 is provided with a rectifying cavity; and the impeller 4 is rotatably arranged in the rectifying cavity.

It can be understood that, because the partial filtering channel 211 of the filtering net 21 is communicated with the water inlet 12, the liquid entering the water meter through the water inlet 12 enters the cavity 11 after being filtered by the filtering net 21, so that impurities in the liquid are isolated outside the filtering net 21, the impurities in the liquid are prevented from entering the water meter to damage components in the water meter, the liquid entering the cavity 11 enters the rectifying cavity after being rectified by the rectifying part 3, and the liquid in the rectifying cavity flows to drive the impeller 4 to rotate, thereby realizing the purpose of measuring the flow of the water.

After the water meter is used for a long time, impurities can be blocked in the partial filtering channel 211 communicated with the water inlet 12, at the moment, the driving part 22 can be moved firstly, the driving part 22 is matched with the filtering net 21, then the driving part 22 is rotated to drive the filtering net 21 to rotate in the cavity 11, so that the blocked partial filtering channel 211 rotates to be not corresponding to the water inlet 12, the partial filtering channel 211 which is not blocked on the filtering net 21 is enabled to be corresponding to the water inlet 12, liquid can not influence the liquidity of the liquid due to the blocking of the partial filtering channel 211 when flowing through the filtering net 21, the water meter can avoid the need of replacing the water meter due to the blocking of the filtering channel 211, the service life of the water meter is prolonged, and the waste of resources is avoided.

In summary, by rotating the filter screen 21 to change the relative position between the water inlet 12 and the filter screen 21, when the filter channel 211 on part of the filter screen 21 is blocked, the part of the filter channel 211 which is not blocked can correspond to the water inlet 12 by rotating the filter screen 21, thereby ensuring the fluidity of the liquid.

It should be noted that the rectifying member 3 can rectify the water flow entering the rectifying cavity, and adjust the water flow from turbulent flow to stable laminar flow, so that the rotation precision of the impeller 4 in the rectifying cavity is higher, and the accuracy of the water meter is improved.

It should be noted that the shaft of the impeller 4 is provided with a pinion, and the pinion is engaged with a decimal number gear to achieve the purpose of accumulating the number of revolutions, wherein the decimal number gear is used for rotating one circle of the decadic number gear every time the unit number gear rotates ten circles, so that the purpose of recording the water volume is achieved.

In some embodiments of the present invention, a sealing sleeve 24 is disposed at the bottom of the cavity 11, the driving member 22 is disposed in the sealing sleeve 24, and a lip-shaped sealing ring 241 is disposed between the sealing sleeve 24 and the driving member 22. It will be appreciated that the sealing aperture 14 communicates with the inner bore of the sealing sleeve 24, and the sealing aperture 14 can be sealed by providing a lip seal 241 within the sealing sleeve 24 to prevent water leakage from the sealing aperture 14 during movement of the driving member 22.

In the present embodiment, the driving member 22 is a driving rod, and two lip-shaped sealing rings 241 are spaced in the sealing sleeve 24 along the moving direction of the driving member 22, so as to ensure the sealing performance of the sealing hole 14.

In some embodiments of the present invention, a second limit protruding ring is disposed on the driving member 22, and the driving member 22 and the filter screen 21 are matched with each other when the driving member 22 is moved to make the second limit protruding ring stop against the sealing sleeve 24. It can be understood that, through setting up the spacing bulge loop of second to at the in-process of removal driving piece 22, can carry on spacingly to driving piece 22, guarantee when the spacing bulge loop of second cooperates with seal cover 24, driving piece 22 can cooperate with filter screen 21, thereby guarantee the reliability of complex between driving piece 22 and the filter screen 21, so that drive filter screen 21 better and rotate, thereby be convenient for change the position of filter screen 21 for water inlet 12.

In some embodiments of the present invention, the present invention further comprises a sealing cover 5 covering the sealing hole 14, one end of the sealing cover 5 is rotatably connected to the housing 1, the other end of the sealing cover 5 is detachably connected to the housing 1, and a sealing ring 51 surrounding the sealing hole 14 is disposed between the sealing cover 5 and the housing 1.

It can be understood that, through covering the sealed cowling 5 in the outside of sealed hole 14 to make the driving piece 22 that is located the outside of casing 1 be located sealed cowling 5, thereby protect driving piece 22, avoid taking place the maloperation phenomenon, set up sealing ring 51 simultaneously between sealed cowling 5 and casing 1, guarantee the leakproofness between sealed cowling 5 and the casing 1, even sealed hole 14 takes place to leak, also can not make liquid flow out, improve the security of water gauge.

In some embodiments of the present invention, the filter screen 21 comprises a first screen body 212 and a second screen body 213, and the filter passage 211 comprises a first filter hole 2121 disposed on the first screen body 212 and a second filter hole 2131 disposed on the second screen body 213; the first net body 212 is rotatably connected in the cavity 11, the second net body 213 is rotatably connected in the first net body 212, and the driving member 22 is switchably matched with the first net body 212 and the second net body 213 to respectively drive the first net body 212 and the second net body 213 to rotate.

It can be understood that, when a portion of the first filtering holes 2121 of the first net body 212 corresponding to the water inlet 12 is blocked, or a portion of the second filtering holes 2131 of the second net body 213 corresponding to the water inlet 12 is blocked, the driving member 22 is moved to enable the driving member 22 to be engaged with the first net body 212 or the second net body 213, and then the driving member 22 is rotated to drive the first net body 212 or the second net body 213 to rotate, so that the blocked first filtering holes 2121 or the blocked second filtering holes 2131 are rotated to be not corresponding to the water inlet 12, thereby ensuring the fluidity of the liquid.

Meanwhile, it should be noted that, after the partially blocked first filter hole 2121 and second filter hole 2131 are rotated to a side far away from the water inlet 12, the flowing direction of the liquid in the partially blocked first filter hole 2121 and second filter hole 2131 is changed, i.e. the flowing direction of the liquid in the first filter hole 2121 and second filter hole 2131 is opposite, so as to flush out the impurities blocked in the first filter hole 2121 and second filter hole 2131, so that the filter screen 21 can be reused, and the service life of the water meter is further prolonged.

In some embodiments of the present invention, the diameter of the first filter holes 2121 is larger than the diameter of the second filter holes 2131, and a storage chamber is defined between the first mesh body 212 and the second mesh body 213. It can be understood that, since the diameter of the first filtering hole 2121 of the first mesh body 212 located at the outer side is larger than the diameter of the second filtering hole 2131 of the second mesh body 213 located at the inner side, after a part of the impurities pass through the first filtering hole 2121, the second mesh body 213 can filter the part of the impurities, and the part of the impurities is temporarily stored in the storage cavity, and as the liquid flows, the impurities in the storage cavity flow out from the first filtering hole 2121 at the other side of the first mesh body 212, so that the part of the impurities is prevented from entering the inside of the water meter, and the movement of the water meter is prevented from being damaged.

Meanwhile, when a portion of the first filtering holes 2121 of the first net body 212 corresponding to the water inlet 12 is blocked, the driving member 22 can be pulled downward to make the driving member 22 cooperate with the first net body 212, so that the driving member 22 is rotated to drive the first net body 212 to rotate in the cavity 11, and a portion of the first filtering holes 2121 of the first net body 212 that is not blocked corresponds to the water inlet 12, so that when the liquid flows through the first net body 212, the liquid flowability is not affected due to the blocking of a portion of the first filtering holes 2121.

When a part of the second filtering holes 2131 of the second net body 213 corresponding to the water inlet 12 is blocked by smaller impurities, the driving member 22 can be pushed upwards to enable the driving member 22 to be matched with the second net body 213, so that the driving member 22 is rotated to drive the second net body 213 to rotate in the cavity 11, and a part of the second filtering holes 2131 of the second net body 213 which are not blocked corresponds to the water inlet 12, so that when liquid flows through the second net body 213, the liquid flowability cannot be affected due to the blocking of the part of the second filtering holes 2131.

It should be noted that, in the prior art, since the filter screen 21 has only one layer, the aperture of the filter holes on the filter screen 21 is relatively large in consideration of the flow speed of the liquid, but in the present invention, since the first screen body 212 and the second screen body 213 are arranged at intervals, and the diameter of the second filter hole 2131 on the second screen body 213 is relatively small, it is possible to prevent impurities from entering the inside of the water meter as much as possible, so as to prevent the movement of the water meter from being damaged.

In some embodiments, the first filtering holes 2121 are opposite to the second filtering holes 2131 in a one-to-one correspondence manner, the first filtering holes 2121 and the second filtering holes 2131 are in a circular truncated cone shape, and the aperture at the position with the smallest diameter of the first filtering holes 2121 is equal to the aperture at the position with the largest diameter of the second filtering holes 2131, so that the filtering effect is improved, and impurities are prevented from entering the water meter as much as possible.

In some embodiments of the present invention, the driving member 22 includes a driving member 22, and the driving member 22 is provided with a first gear 221 and a second gear 222 at intervals; the bottom of the first net body 212 is provided with a through hole, a first mating gear 2122 is arranged in the through hole, a second mating gear 2132 is arranged at the bottom of the second net body 213, and the driving member 22 is moved to enable the first gear 221 to be meshed with the first mating gear 2122 or the second gear 222 to be meshed with the second mating gear 2132.

It will be appreciated that when the portion of the first filtering hole 2121 of the first net body 212 corresponding to the water inlet 12 is blocked, the driving member 22 can be pulled downwards to engage the first gear 221 of the driving member 22 with the first engaging gear 2122, so as to rotate the driving member 22 to rotate the first net body 212 in the cavity 11, so that the rotating structure of the first net body 212 is simpler, and the position of the first net body 212 relative to the water inlet 12 can be changed conveniently.

When a portion of the second filtering holes 2131 of the second net body 213 corresponding to the water inlet 12 is blocked by a small impurity, the driving member 22 can be pushed upwards to make the second gear 222 of the driving member 22 cooperate with the second cooperating gear 2132 of the second net body 213, so that the driving member 22 is rotated to drive the second net body 213 to rotate in the cavity 11, the rotating structure of the second net body 213 is simpler, and the position of the second net body 213 relative to the water inlet 12 can be changed conveniently.

In some embodiments of the invention, the first mating gear 2122 is disposed around the first gear 221 and the second mating gear 2132 is disposed around the second gear 222. Therefore, the first engaging gear 2122 is located at the middle of the first net body 212, and the second engaging gear 2132 is located at the middle of the second net body 213, so as to ensure the stability of the first net body 212 and the second net body 213 during rotation.

In some embodiments of the present invention, a protective sleeve 23 is disposed at the bottom of the second net body 213, the protective sleeve 23 is disposed around the second matching gear 2132, a first limiting convex ring 231 is disposed in the protective sleeve 23, the first limiting convex ring 231 is located between the first matching gear 2122 and the second matching gear 2132, and the first matching gear 2122 is engaged with the first gear 221 in a state that the second gear 222 is stopped against the first limiting convex ring 231.

It can be understood that the second matching gear 2132 is placed in the protective cover 23, so that the second matching gear 2132 is prevented from being directly impacted by liquid, the second matching gear 2132 is prevented from being damaged, meanwhile, the first limiting convex ring is arranged in the protective cover 23, the movement of the driving part 22 can be limited, and the matching between the first gear 221 and the first matching gear 2122 is ensured to be more reliable after the driving part 22 is moved.

The invention also provides a use method of the water meter in any one of the above embodiments, which comprises the following steps; filtering water, wherein at least a part of the filtering channel 211 on the filtering screen 21 is communicated with the water inlet 12 by shielding the filtering screen 21 from the water inlet 12 so as to filter the liquid entering the cavity 11;

rectification, wherein liquid filtered by the filter screen 21 enters the cavity 11, the liquid in the cavity 11 enters the rectification cavity after being rectified by the rectification piece 3, and the rectified liquid in the rectification cavity drives the impeller 4 to rotate;

and (3) changing the position, moving the driving part 22 to enable the driving part 22 to be matched with the filter screen 21, and rotating the driving part 22 to drive the filter screen 21 to rotate in the cavity 11 so as to replace at least part of the filter channel 211 on the filter screen 21 to be communicated with the water inlet 12.

According to the use method of the water meter, as part of the filtering channel 211 of the filtering screen 21 is communicated with the water inlet 12, the liquid entering the water meter through the water inlet 12 enters the cavity 11 after being filtered by the filtering screen 21, so that impurities in the liquid are isolated outside the filtering screen 21, the impurities in the liquid are prevented from entering the water meter to damage parts in the water meter, the liquid entering the cavity 11 enters the rectifying cavity after being rectified by the rectifying part 3, and the liquid in the rectifying cavity flows to drive the impeller 4 to rotate, so that the purpose of measuring the flow of the water is achieved.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A water meter, comprising:

the impeller is rotatably arranged in the rectifying cavity.

2. A water meter as claimed in claim 1, wherein said screen includes a first mesh body and a second mesh body, said filter path including a first filter aperture provided in said first mesh body and a second filter aperture provided in said second mesh body;

3. A water meter as claimed in claim 2, wherein the diameter of said first filtering aperture is greater than the diameter of said second filtering aperture, and a storage chamber is defined between said first and second screens.

4. A water meter as claimed in claim 2, wherein said drive member includes a drive member having a first gear and a second gear spaced apart from each other;

5. A water meter as claimed in claim 4, wherein said first mating gear is disposed around said first gear and said second mating gear is disposed around said second gear.

6. A water meter as claimed in claim 5, wherein a protective sleeve is provided at the bottom of said second mesh body, said protective sleeve is disposed around said second mating gear, a first limit protruding ring is provided in said protective sleeve, said first limit protruding ring is located between said first mating gear and said second mating gear, and said first mating gear and said first gear are engaged with each other in a state where said second gear abuts against said first limit protruding ring.

7. A water meter as claimed in claim 1, wherein a sealing sleeve is provided at the bottom of said cavity, said drive member is received in said sealing sleeve, and a lip seal is provided between said sealing sleeve and said drive member.

8. A water meter as claimed in claim 7, wherein a second stop collar is provided on the drive member, and the drive member cooperates with the filter screen when the drive member is moved to stop the second stop collar against the seal cartridge.

9. A water meter as recited in claim 1, further comprising a seal housing disposed over said seal opening, one end of said seal housing being pivotally connected to said housing and the other end of said seal housing being removably connected to said housing, a seal ring being disposed between said seal housing and said housing and disposed around said seal opening.

10. A method of using a water meter as claimed in any one of claims 1 to 9, including the steps of;