CN216815600U - Double-impeller water meter - Google Patents

Abstract

The application relates to water gauge technical field, discloses a bilobed wheel water gauge, includes: the cleaning device comprises a shell, a cleaning pipe, a first impeller, a second impeller and a regulating valve. The top end of the shell is fixedly connected with a shell, and an instrument panel is arranged in the shell; the supporting frame is fixedly connected with the inner bottom wall of the shell, the top surface of the supporting frame is fixedly connected with a first frame, and a second frame is arranged above the first frame; the cleaning pipe penetrates through the lower end of the shell, and a detachable end cover is arranged on the side wall of the cleaning pipe; the first impeller is arranged inside the first frame; the second impeller is arranged in the second frame, and a speed reduction gear cavity is arranged above the second impeller. In this application, can rotate simultaneously through first impeller and second impeller, measure big discharge to idle running can also be avoided the water gauge, be favorable to improving the accuracy of discharge measurement.

Description

Double-impeller water meter

Technical Field

The application relates to the technical field of water meters, for example to a double-impeller water meter.

Background

The water meter is an instrument for measuring water flow, mostly is the accumulated flow measurement of water, and generally is divided into a positive displacement water meter and a speed water meter, and when a user does not use the existing water meter, redundant air is mostly stored in the existing water meter, so that the water meter idles, and the water flow is not accurately measured.

In the related art, there is an idle rotation preventing water meter, which operates on the principle that when water flows through, water pressure causes a first valve core to compress a first spring, the water flows into the metering mechanism from a sealing plate and the first valve core at intervals, flows into a metering mechanism through a side wall water flow port and a first spring seat flow hole of the first valve core, then water pressure causes a second valve core to compress a second spring, and the water flows out from a space between the second valve core and a third installation cavity through a side wall water flow hole and a second spring seat flow hole of the second valve core, so that the expansion of 'compressed air' in a water pipe is inhibited through the mutual matching of the first valve core, the second valve core, the first compression spring and the second compression spring, the possibility of idle rotation of the water meter is reduced, the metering accuracy of the water meter is improved, but the metering of the water meter is easily influenced by the sealing performance of the first valve core and the second valve core during operation, and when the water flow is large, the impact force to the first valve core and the second valve core is large, and redundant air is easy to enter the inner cavity of the water meter, so that the metering of the water meter is not accurate enough.

Therefore, how to improve the metering accuracy of water flow while avoiding idle rotation of the water meter becomes an urgent technical problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a double-impeller water meter, which can better avoid idle running of the water meter and improve the metering accuracy of water flow.

In some embodiments, a dual impeller water meter, comprising: the device comprises a shell, a support frame, a cleaning pipe, a first impeller and a second impeller. The top end of the shell is fixedly connected with a shell, and an instrument panel is arranged in the shell; the supporting frame is fixedly connected with the inner bottom wall of the shell, the top surface of the supporting frame is fixedly connected with a first frame, and a second frame is arranged above the first frame; the cleaning pipe penetrates through the lower end of the shell, and a detachable end cover is arranged on the side wall of the cleaning pipe; the first impeller is arranged inside the first frame; the second impeller is arranged in the second frame, and a reduction gear cavity is arranged above the second impeller.

The double-impeller water meter provided by the embodiment of the disclosure can realize the following technical effects:

the first impeller is arranged in the first frame, the second impeller is arranged in the second frame, the first impeller is arranged above the second impeller, under the condition of smaller water flow, water flow can circulate at the lower position of the shell to drive the first impeller to rotate for water flow metering, under the condition of larger water flow, the water flow enters the first frame to drive the first impeller to rotate and continuously flows to the upper position of the shell and enters the second frame to drive the second impeller to rotate, so that the water flow is metered by the simultaneous rotation of the first impeller and the second impeller, the metering of the water meter can be favorably realized aiming at different flows, the metering precision of the water meter can be more accurate under the impact of the water flow with different flows, and under the condition of smaller water flow, the water flow only drives the first impeller to rotate for water flow metering, only under the condition of large water flow, the first impeller and the second impeller can rotate simultaneously to carry out water flow metering, thereby being beneficial to avoiding idle running of the water meter and improving the metering accuracy of the water flow.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated in the accompanying drawings, which correspond to the accompanying drawings and not in a limiting sense, in which elements having the same reference numeral designations represent like elements, and in which:

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an overall exploded view of the present invention;

FIG. 3 is another exploded view of the present invention as a whole;

FIG. 4 is a schematic view of the internal structure of a housing according to the present invention;

FIG. 5 is an enlarged view of the utility model at A;

FIG. 6 is a schematic view of the internal structure of another housing of the present invention;

FIG. 7 is a schematic view of the internal structure of another housing of the present invention;

FIG. 8 is a block diagram of the connection of the valve controller of the present invention;

FIG. 9 is a block diagram of the connection of the calculation module of the present invention to the rotational speed sensor.

Reference numerals:

1. a housing; 2. a water inlet pipe; 3. a water outlet pipe; 4. a housing; 5. an instrument panel; 6. opening and closing the cover; 7. a hinge; 8. cleaning the pipe; 9. an external thread; 10. an end cap; 11. an internal thread; 12. a groove; 13. a seal ring; 14. a support frame; 15. a first frame; 16. a first filter plate; 17. a first impeller; 18. a rotating shaft; 19. a sleeve; 20. a second impeller; 21. a second frame; 22. a second filter plate; 23. a reduction gear chamber; 24. a first chamber; 25. a second chamber; 26. adjusting a valve; 27. connecting the partition boards; 28. a valve controller; 29. a water level sensor; 30. a first rotating shaft; 31. a second rotating shaft; 32. a rotational speed sensor; 33. and a calculation module.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their examples and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art according to specific situations.

The term "plurality" means two or more unless otherwise specified.

In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

Referring to fig. 1 to 8, an embodiment of the present disclosure provides a double-impeller water meter, including: the cleaning device comprises a shell 1, a support frame 14, a cleaning pipe 8, a first impeller 17 and a second impeller 20. A casing 4 is fixedly connected to the top end of the shell 1, and an instrument panel 5 is arranged inside the casing 4; the supporting frame 14 is fixedly connected with the inner bottom wall of the shell 1, the top surface of the supporting frame 14 is fixedly connected with a first frame 15, and a second frame 21 is arranged above the first frame 15; the cleaning pipe 8 penetrates through the lower end of the shell 1, and a detachable end cover 10 is arranged on the side wall of the cleaning pipe 8; the first impeller 17 is disposed inside the first frame 15; the second impeller 20 is provided inside the second frame 21, and a reduction gear chamber 23 is provided above the second impeller 20.

By adopting the double-impeller water meter provided by the embodiment of the disclosure, the first impeller 17 is arranged in the first frame 15, the second impeller 20 is arranged in the second frame 21, and the first impeller 17 is arranged above the second impeller 20, under the condition of small water flow, water can circulate at the lower position of the shell 1 to drive the first impeller 17 to rotate for water flow metering, and under the condition of large water flow, the water can flow to the upper position of the shell 1 while entering the first frame 15 to drive the first impeller 17 to rotate, and enters the second frame 21 to drive the second impeller 20 to rotate, so that the water can be metered by rotating the first impeller 17 and the second impeller 20 simultaneously, which is beneficial to realizing metering of different flow, the metering of the water meter can be under the impact of water flow of different flow, and the metering precision is more accurate, and under the condition that discharge is less, rivers only can drive first impeller 17 to rotate and carry out the rivers measurement, and first impeller 17 and second impeller 20 just can rotate simultaneously under the great condition of discharge only, carry out the rivers measurement, are favorable to avoiding the water gauge idle running to appear, improve the measurement accuracy of discharge.

As shown in fig. 1-3, optionally, there is a threaded connection between the top end of the housing 1 and the casing 4. Like this, can be through threaded connection's mode with cover 4 fixed connection at the top of casing 1, simple structure is convenient for install and dismantle cover 4.

Optionally, a water inlet pipe 2 is arranged through one side wall of the housing 1, and a water outlet pipe 3 is arranged through the other side wall of the housing 1. Therefore, water liquid can enter the shell 1 through the water inlet pipe 2 and then flow out through the water outlet pipe 3, so that the circulation of the water liquid is smoother, and the circulation efficiency of the water liquid is improved.

Optionally, the pipe diameter of the inlet pipe 2 is the same as the pipe diameter of the outlet pipe 3. Therefore, after the water enters the shell 1 from the water inlet pipe 2, the water is further discharged through the water outlet pipe 3 under the action of the first impeller 17 and the second impeller 20, and the pipe diameters of the water inlet pipe 2 and the water outlet pipe 3 are the same, which is beneficial to improving the stability and the continuity of water circulation.

Optionally, an opening and closing cover 6 is disposed on a side of the casing 4 facing away from the housing 1, a hinge 7 is disposed on a sidewall of the opening and closing cover 6, and the opening and closing cover 6 is rotatably connected with the casing 4 through the hinge 7. Like this, upwards lift and open and shut lid 6 and can open the lid 6 that opens and shuts under the effect of hinge 7 to come to look over the water consumption, the lid 6 that opens and shuts simultaneously can form the protection on the upper portion of casing 1, avoids the foreign object to cause the damage to the upper portion of casing 1, thereby makes the inside structure even running of casing 1.

Optionally, the outer side wall of the cleaning pipe 8 is provided with an external thread 9, the inner side wall of the end cover 10 is provided with an internal thread 11, and the external thread 9 is matched with the internal thread 11. Like this, external screw thread 9 on the lateral wall of accessible clearance pipe 8 cooperatees with internal thread 11 on the inside wall of end cover 10, twist and move end cover 10 and make its installation fix on the lateral wall of clearance pipe 8, or twist and move end cover 10 and dismantle it, thereby the realization is to opening or closing of clearance pipe 8, be favorable to carrying out timely clearance to clearance pipe 8, avoid the impurity in the water liquid to pile up and cause the jam in the bottom of casing 1, improve the circulation efficiency of water liquid.

Optionally, a sealing ring 13 is arranged between the end cap 10 and the cleaning pipe 8, a groove 12 is arranged on a surface of the end cap 10 facing the cleaning pipe 8, and the sealing ring 13 is matched with the groove 12. Like this, when twist and move end cover 10 and make it be connected the fixed with clearance pipe 8, the sealing washer 13 that is located recess 12 can with the bottom looks butt of clearance pipe 8 to form seal structure between clearance pipe 8 and end cover 10, be favorable to improving the leakproofness between clearance pipe 8 and the end cover 10, can avoid the infiltration.

Optionally, the cleaning tube 8 is located directly below the support frame 14. Like this, impurity can drop to the clearance pipe 8 in through support frame 14, can collect and clear up the impurity in the water better, improves the cleanliness factor of the rivers in the water gauge, avoids impurity to pile up the flow that hinders the rivers, reduces the accuracy of rivers measurement to be favorable to improving the accuracy nature of rivers measurement.

As shown in fig. 4-5, optionally, a first filter plate 16 is disposed between the first frame 15 and the first impeller 17, and the first filter plate 16 is fixedly connected to the top surface of the support frame 14. Like this, can intercept aquatic impurity through first filter plate 16, after using for a long time in the not good environment of quality of water, impurity can be blocked by first filter plate 16 before contacting first impeller 17 in the water, and the impurity of blocking can fall to in the clearance pipe 8, twist the end cover 10, open end cover 10 under the cooperation of internal thread 11 and external screw thread 9, and then clear up the impurity in the clearance pipe 8, be favorable to improving first impeller 17's cleanliness, thereby avoid impurity to hinder first impeller 17 to rotate, make first impeller 17 can rotate under the drive of rivers better, further improve the measurement accuracy of the water yield.

Optionally, a second filter plate 22 is disposed between the second frame 21 and the second impeller 20, and the second filter plate 22 is fixedly connected to the bottom surface of the reduction gear chamber 23. Like this, can intercept aquatic impurity through second filter plate 22, long-term back of using in the not good environment of quality of water, impurity can be blocked by second filter plate 22 before contacting second impeller 20 in the water, and the impurity of blocking can fall to in the clearance pipe 8, twist end cover 10, open end cover 10 under the cooperation of internal thread 11 and external screw thread 9, and then clear up the impurity in the clearance pipe 8, be favorable to improving the cleaning performance of second impeller 20, thereby avoid impurity to obstruct second impeller 20 to rotate, make second impeller 20 can rotate under the drive of rivers better, further improve the measurement accuracy of the water yield.

Alternatively, the first filter plate 16 and the second filter plate 22 are the same size. Like this, be convenient for improve stability and the continuity to aquatic impurity interception to reduce the impurity of aquatic through first filter plate 16 and second filter plate 22, improve quality of water, simultaneously under the effect of first filter plate 16 and second filter plate 22, can also intercept the impurity of aquatic, and make impurity fall into in the clearance pipe 8, thereby be favorable to carrying out the interception to the impurity of aquatic and collect and clear up.

Optionally, a rotating shaft 18 is fixedly connected to the inside of the first impeller 17, a sleeve 19 is rotatably connected to the bottom end of the rotating shaft 18, the sleeve 19 is fixedly connected to the supporting frame 14, and the top end of the rotating shaft 18 passes through the second impeller 20 and extends to the input end of the reduction gear cavity 23. Therefore, when the rotating shaft 18 rotates, the water meter pointer can rotate through the matching of the speed reduction gear cavity 23, so that the metering information of the water quantity can be better acquired through the index of the water meter pointer, and the metering accuracy of the water meter is improved.

Alternatively, the first impeller 17 is of the same construction as the second impeller 20, the first impeller 17 being located in a lower region of the flow conduit within the casing 1 and the second impeller 20 being located in an upper region of the flow conduit within the casing 1. Therefore, when the flow in the circulation pipeline in the shell 1 is large, the first impeller 17 and the second impeller 20 can be driven by water flow to rotate at the same time, and when the flow in the circulation pipeline is small, the first impeller 17 located in the lower area is driven to rotate, so that the measurement can be performed on different flows, and the measurement accuracy of the water meter is improved.

As shown in connection with fig. 6, in some embodiments, optionally, the first impeller 17 is disposed within the first chamber 24 and the second impeller 20 is disposed within the second chamber 25. Like this, can make first impeller 17 at the internal rotation of first cavity 24, second impeller 20 is at the internal rotation of second cavity 25 to under the great condition of discharge, open governing valve 26 and make rivers flow to second cavity 25 in from first cavity 24, drive second impeller 20 and rotate, be favorable to making first impeller 17 and second impeller 20's rotation mutual noninterference, avoid the water gauge idle running to appear, improve the measurement accuracy nature of rivers.

Optionally, a regulating valve 26 is provided between the first chamber 24 and the second chamber 25. Like this, can make rivers in the first cavity 24 enter into the second cavity 25 through the aperture of control governing valve 26 to drive second impeller 20 and rotate, realize carrying out accurate measurement to rivers when discharge is great, can also prevent simultaneously that second impeller 20 from taking place idle running when discharge is less, be favorable to improving the measurement accuracy of discharge.

Alternatively, both sides of the first chamber 24 and the second chamber 25 are respectively communicated with the water inlet pipe 2 and the water outlet pipe 3. Therefore, under the condition of small water flow, the regulating valve 26 can be closed, so that water can enter the first chamber 24 through the water inlet pipe 2 and flow at the lower part of the shell 1 to drive the first impeller 17 to rotate, and the small water flow is metered; and under the great condition of discharge, can open governing valve 26, rivers enter into and drive first impeller 17 pivoted in the first cavity 24, can flow to the upper portion of casing 1 and enter into and drive second impeller 20 to rotate in the second cavity 25, the realization is to the measurement of big discharge, thereby the rotation through first impeller 17 and second impeller 20 measures rivers, be favorable to avoiding under the less condition of discharge, idle rotation appears in second impeller 20, improve the accuracy of discharge measurement.

Optionally, a connecting partition 27 is disposed between the first chamber 24 and the second chamber 25, and an underside of an edge of the connecting partition 27 is fixedly connected to the first frame 15, and an underside is fixedly connected to the second frame 21. Like this, through be provided with between first cavity 24 and second cavity 25 and connect baffle 27, can make the first impeller 17 in the first cavity 24 and the second impeller 20 in the second cavity 25 mutual noninterference when rotating, improve the rotational stability of first impeller 17 and second impeller 20 to be favorable to improving the accuracy nature to the rivers measurement.

Optionally, the adjusting valve 26 is disposed on the connecting partition 27 and between the rotating shaft 18 and the first frame 15. Therefore, the water flow in the first chamber 24 can be controlled to enter the second chamber 25 by controlling the opening or closing of the regulating valve 26, so that the water flow is metered by rotating the double impellers, and the accuracy of water flow metering is improved.

As shown in fig. 2 and 6, it is understood that a valve controller 28 is provided on the outside of the housing 1, and the valve controller 28 is connected to the regulating valve 26 for controlling the opening or closing of the regulating valve. Like this, can be through opening or closing of valve controller 28 convenient and fast ground control governing valve 26, thereby under the great condition of discharge, control governing valve 26 through valve controller 28 and open, under the less condition of discharge, control governing valve 26 through valve controller 28 and close, thereby realize measuring little discharge through first impeller 17, measure big discharge through first impeller 17 and second impeller 20, be favorable to improving the measurement accuracy nature to rivers, avoid simultaneously under the less condition of discharge, second impeller 20 appears idling and leads to discharge measurement not accurate enough.

It should be noted that the rotating shafts 18 are disposed in the first chamber 24 and the second chamber 25, and the rotating shafts 18 in the first chamber 24 and the rotating shafts 18 in the second chamber 25 rotate independently without interfering with each other. In this way, when the water flow rate is small, the water flow rate can be measured by the rotation of the first impeller 17, and when the water flow rate is large, the water flow rate can be measured by the rotation of the first impeller 17 and the second impeller 20, which is advantageous for improving the accuracy of water flow measurement.

As shown in fig. 7 to 9, a water level sensor 29 is optionally provided at the bottom of the connecting partition 27, and the water level sensor 29 is connected to a valve controller 28, and the valve controller 28 can control the regulating valve 26 to open or close according to a water level signal detected by the water level sensor 29. Like this, when the higher contact of the water level in first cavity 24 connects baffle 27, water level sensor 29 can detect the water level signal in first cavity 24 and transmit to valve controller 28 in, valve controller 28 can open according to water level signal control governing valve 26 this moment, thereby make rivers in first cavity 24 enter into second cavity 25 in, drive second impeller 20 and rotate, be favorable to under the great condition of rivers, can in time open governing valve 26, thereby realize the measurement to rivers, and when the water level in first cavity 24 is lower, water level sensor 29 can not detect water level signal, valve controller 28 can control governing valve 26 and close this moment, avoid filling up air in the second cavity 25 and lead to second impeller 20 to appear idle running, thereby be favorable to improving the measurement accuracy of rivers.

In some embodiments, optionally, the rotating shaft 18 includes a first rotating shaft 30 and a second rotating shaft 31, wherein a lower end of the first rotating shaft 30 is rotatably connected with a sleeve 19, and the sleeve 19 is fixedly connected with the supporting frame 14; the lower end of the second rotating shaft 31 is rotatably connected with a sleeve 19, the lower end of the sleeve 19 is fixedly connected with the connecting partition plate 27, and the second rotating shaft 31 is of a hollow structure and is sleeved on the first rotating shaft 30. Like this, can make the rotation of first pivot 30 and second pivot 31 mutual noninterference to can measure the rivers of different flow through the rotation of first pivot 30 and second pivot 31, be favorable to improving the accuracy nature of rivers measurement.

Optionally, the tops of the first rotating shaft 30 and the second rotating shaft 31 are both provided with a rotating speed sensor 32. Like this, can respond to the rotational speed of measuring the speed to first pivot 30 and second pivot 31 through rotational speed inductor 32 to calculate through the rotational speed of first pivot 30 and second pivot 31 and obtain through the discharge in the first cavity 24 and through the discharge in the second cavity 25, improve the accuracy of rivers measurement.

Alternatively, the first rotating shaft 30 passes through the first impeller 17, and an outer side wall of the first rotating shaft 30 is fixedly connected with the first impeller 17, the second rotating shaft 31 passes through the second impeller 20, and an outer side wall of the second rotating shaft 31 is fixedly connected with the second impeller 20. Like this, under the impact of rivers, first impeller 17 can rotate and further drive first pivot 30 and rotate, and second impeller 20 can rotate and further drive second pivot 31 and rotate to can drive the rotational speed inductor 32 rotation on first pivot 30 and the second pivot 31, the realization is responded to the rotational speed of first pivot 30 and second pivot 31 and is tested the speed, and then measures the rivers through in the first cavity 24 and in the second cavity 25.

Optionally, the twin impeller water meter further comprises: a calculation module 33. The calculating module 33 is respectively connected to the rotating speed sensor 32 on the first rotating shaft 30 and the rotating speed sensor 32 on the second rotating shaft 31, and is configured to calculate the water flow rate according to the rotating speeds of the first rotating shaft 30 and the second rotating shaft 31. In this way, the calculation module 33 can calculate the water flow passing through the first chamber 24 according to the rotation speed of the first rotating shaft 30 and calculate the water flow passing through the second chamber 25 according to the rotation speed of the second rotating shaft 31, which is beneficial to measuring the water flow passing through the first chamber 24 when the first impeller 17 rotates, measuring the water flow passing through the second chamber 25 when the second impeller 20 rotates, and measuring the total water flow passing through the first chamber 24 and the second chamber 25 through the calculation module 33 when the first impeller 17 and the second impeller 20 rotate simultaneously, thereby effectively improving the accuracy of water flow measurement.

The above description and the drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A twin-impeller water meter comprising:

the instrument panel comprises a shell (1), wherein the top end of the shell is fixedly connected with a casing (4), and an instrument panel (5) is arranged inside the casing (4);

the supporting frame (14) is fixedly connected with the inner bottom wall of the shell (1), the top surface of the supporting frame (14) is fixedly connected with a first frame (15), and a second frame (21) is arranged above the first frame (15);

the cleaning pipe (8) penetrates through the lower end of the shell (1), and a detachable end cover (10) is arranged on the side wall of the cleaning pipe (8);

a first impeller (17) provided inside the first frame (15);

and the second impeller (20) is arranged in the second frame (21), and a reduction gear cavity (23) is arranged above the second impeller (20).

2. A twin-impeller water meter as defined in claim 1 in which a water inlet pipe (2) extends through one side wall of the housing (1) and a water outlet pipe (3) extends through the other side wall of the housing (1).

3. A twin-impeller water meter according to claim 1, characterised in that the side of the housing (4) facing away from the housing (1) is provided with an opening and closing cover (6), the side walls of the opening and closing cover (6) are provided with hinges (7), and the opening and closing cover (6) is rotatably connected to the housing (4) via the hinges (7).

4. A twin-impeller water meter according to claim 1, characterised in that the cleaning tube (8) is provided with an external thread (9) on its outer side wall and the end cap (10) is provided with an internal thread (11) on its inner side wall, the external thread (9) cooperating with the internal thread (11).

5. A twin-impeller water meter according to claim 1, characterised in that a sealing ring (13) is provided between the end cap (10) and the cleaning pipe (8), that a groove (12) is provided in the side of the end cap (10) facing the cleaning pipe (8), and that the sealing ring (13) cooperates with the groove (12).

6. A twin-impeller water meter as defined in claim 1 in which a first filter plate (16) is disposed between said first frame (15) and said first impeller (17), said first filter plate (16) being fixedly attached to the top surface of said support frame (14).

7. A twin-impeller water meter as defined in claim 1, characterised in that a second filter plate (22) is provided between said second frame (21) and said second impeller (20), said second filter plate (22) being fixedly connected to the bottom surface of said reduction gear chamber (23).

8. A twin-impeller water meter as defined in claim 1, wherein the first impeller (17) is fixedly connected with a rotating shaft (18) inside, the bottom end of the rotating shaft (18) is rotatably connected with a sleeve (19), the sleeve (19) is fixedly connected with the supporting frame (14), and the top end of the rotating shaft (18) passes through the second impeller (20) and extends to the input end of the reduction gear chamber (23).

9. A twin-impeller water meter as claimed in claim 1, characterised in that the first impeller (17) is of the same construction as the second impeller (20), the first impeller (17) being located in the lower region of the flow passage in the housing (1) and the second impeller (20) being located in the upper region of the flow passage in the housing (1).

10. A twin impeller water meter as claimed in any one of claims 1 to 9, characterised in that the cleaning tube (8) is located directly below the support frame (14).

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