A self-powered large-caliber water meter

Abstract

A self-powered large-diameter water meter, comprising a pipe body with a water meter installed therein, a support frame fixedly connected to the inner side of the pipe body, a large impeller rotatably connected to the outer side of the support frame, a rotating shaft rotatably connected to the inner side of the support frame, a magnet fixedly connected to the front end of the rotating shaft after passing through the large impeller, the large impeller is arranged in the pipe body to absorb the impact of the front water flow, the rear end of the rotating shaft is connected with a small impeller, the small impeller is used to absorb the impact of the water flow behind the large impeller and drive the rotating shaft to rotate, a ratchet device for driving the magnet to perform unidirectional transmission is installed on the large impeller, and an induction coil fixedly connected to the pipe body and connected to the power supply module is arranged outside the magnet.

Description

Technical Field

[0001] The present invention relates to the technical field of water meters, and in particular to a self-powered large-diameter water meter. Background Art

[0002] Water meters are installed in the water pipes of the water supply network to measure the water flow. In order to facilitate the water supply unit to collect the water meter readings of the water-using terminals, intelligent water meters have been adopted in the prior art. Intelligent water meters need to be powered to operate. At present, most intelligent water meters are powered by batteries. After the battery power is used up, manual battery replacement is required. Sometimes, although the structure circuit of the water meter is still within the quality life, the battery power is exhausted. This not only has a high cost, consumes manpower and material resources, but also causes inconvenience to the users.

[0003] The electronic water meter permanent self-power supply device with the patent application number CN200620050365.6 includes a rotating impeller part and an electric energy generating part, which are both installed in the water pipe at the water outlet section of the electronic water meter. It is characterized in that a circular permanent magnet group is installed at one end of the rotating impeller shaft, and the electric energy generating part is installed beside the permanent magnet group. The electric energy generating part is electrically connected to the electronic water meter through a rectifying and voltage-regulating circuit. The above-mentioned utility model drives the impeller and the permanent magnet group to rotate through the water flow, so that the DC generator generates electricity. However, in the transportation of some large-diameter pipelines, the size of the pipeline is usually designed according to the maximum possible water flow. In daily life, the water flow in the pipeline may be small most of the time. This makes the small water flow unable to drive the impeller in the above device to rotate continuously, and thus the water meter cannot be self-powered during a small amount of water supply. Summary of the Invention

[0004] The present invention aims to solve the above problems existing in the prior art, and provides a self-powered large-diameter water meter, which can generate electricity continuously regardless of the size of the water flow in the pipeline, so as to ensure the long-term and stable operation of the water meter.

[0005] Technical solution adopted by the present invention to solve its technical problems: This self-powered large-caliber water meter includes a pipe body with a water meter installed therein. A support frame is fixedly connected to the inner side of the pipe body. A large impeller is rotatably connected to the outer side of the support frame. A rotating shaft is rotatably connected to the inner side of the support frame. The front end of the rotating shaft passes through the large impeller and is fixedly connected with a magnet. The large impeller is arranged inside the pipe body to absorb the impact of the water flow ahead. The rear end of the rotating shaft is connected with a small impeller. The small impeller is used to absorb the impact of the water flow behind the large impeller and drive the rotating shaft to rotate. A ratchet device for driving the magnet to perform one-way transmission is installed on the large impeller. An induction coil fixedly connected to the pipe body and connected to the power supply module is arranged outside the magnet. When the large impeller rotates, the rotational power is transmitted to the magnet through the ratchet device, thereby driving the magnet to rotate. When the water flow rate in the pipe body is small, the large impeller cannot be driven while the small impeller is driven to rotate. At the same time, the water flow generates a certain rotational flow after passing through the large impeller, thereby bringing a greater driving force to the small impeller behind, improving the utilization rate of the water flow. The rotation of the small impeller drives the rotating shaft and the magnet to rotate. Therefore, the magnet can rotate to generate electricity regardless of the flow rate in the pipe body, thereby ensuring the long-term normal operation of the water meter.

[0006] Preferably, the support frame includes a frame body fixedly connected to the inner side of the pipe body and an impeller seat installed at the central position inside the frame body. A shaft hole is opened at the central position inside the impeller seat. The rotating shaft is rotatably connected to the shaft hole through a bearing. The impeller seat is provided with an installation boss protruding from the impeller seat. An installation hole corresponding to the installation boss is opened on the side of the large impeller away from the magnet. The installation boss is rotatably connected to the installation hole through a bearing.

[0007] Preferably, a circular magnet mounting seat connected to the rotating shaft is arranged outside the magnet. The magnets are spacedly installed on the inner wall of the magnet mounting seat. A cavity for accommodating the induction coil is arranged on the side of the magnet mounting seat away from the rotating shaft.

[0008] Preferably, a coil support frame installed on the inner side of the pipe body is arranged outside the induction coil. An induction coil mounting seat located inside the cavity is arranged on the side of the coil support frame facing the magnet. A plurality of wire winding grooves parallel to the axial direction of the magnet are arranged around the induction coil mounting seat. The induction coil is wound outside the wire winding grooves.

[0009] Preferably, stepped surfaces are provided at both the front and rear ends inside the pipe body. Flange portions are provided around the support frame and the coil support frame and are fixedly connected to the stepped surfaces by screws. Sleeves covering the flange portions are provided at both the front and rear ends inside the pipe body. A clamping portion protruding outwards is provided on the flange portion, and a clamping groove corresponding to the clamping portion is formed on the sleeve. The outer end surface of the sleeve and the outer end surface of the pipe body are in the same vertical plane. By providing a stepped surface inside the pipe body and threadedly installing the support frame and the coil support frame on the stepped surface through the flange portions, the installation and fixation of the support frame and the coil support frame are convenient. The sleeves are provided to cover the screws outside the support frame and the coil support frame, preventing particulate matter in the water flow from getting stuck in the screws, thus affecting the normal disassembly of the screws. At the same time, the stepped surface formed between the support frame and the coil support frame and the pipe body is also eliminated, making the water flow more smooth after entering the pipe body.

[0010] Preferably, the ratchet device includes a pawl rotatably connected to the outer surface of the large impeller through a central shaft. A torsion spring is provided outside the central shaft, and the two ends of the torsion spring are respectively installed on the pawl and the large impeller. A limiting tooth protruding outwards and corresponding to the pawl is provided outside the magnet mounting seat. A limiting portion is provided on the outer surface of the large impeller outside the pawl. An arc portion is provided on the side of the pawl away from the limiting tooth, and a limiting surface in contact with and limiting the limiting portion is provided on the side of the arc portion opposite to the rotation direction of the large impeller. When the water flow rate in the pipe body is large enough, the water flow drives the large impeller to rotate clockwise. The pawl stuck on the limiting tooth of the large impeller also rotates clockwise with the large impeller. At the same time, the pawl rotates clockwise around the central shaft under the action of the limiting tooth until it stops rotating after the limiting surface contacts and locks with the limiting portion. At this time, the large impeller drives the stuck pawl to rotate, and the pawl drives the magnet mounting seat and the magnet to rotate clockwise through the limiting tooth. The rotation of the magnet then causes the magnetic field outside the induction coil to change. When the water flow rate in the pipe body is small and can only drive the small impeller to rotate, the small impeller and the rotating shaft also rotate clockwise, thereby driving the magnet on the rotating shaft to rotate clockwise. At this time, the limiting tooth outside the magnet that is mutually limited with the pawl drives the pawl to rotate counterclockwise by a certain angle until the pawl disengages from the corresponding limiting tooth and gets stuck in the next limiting tooth, and so on in a cycle, thus ensuring the normal rotation of the magnet without being limited by the large impeller.

[0011] Preferably, a sliding groove is provided inside the small impeller and is opened outside the rotating shaft. One side of the sliding groove away from the large impeller is connected to a self-rotating groove opened outside the rotating shaft. At the connection of the sliding groove and the self-rotating groove, guiding surfaces are provided on both side walls of the sliding groove. A sliding block is provided on the small impeller and is slidably connected in the sliding groove. A blocking portion is provided outside the small impeller and is fixedly connected to the inner side of the pipe body. At the central position of the blocking portion, a centralized pipe body for accommodating the small impeller is provided. A number of uniformly arranged channel openings are opened on the blocking portion. The outside of the channel openings is covered with a rotating portion. Rotating openings staggered with the channel openings are opened on the rotating portion. The rotating shaft passes through the small impeller and is rotatably connected to a support seat installed inside the pipe body. A turntable bearing is installed on one end of the small impeller and is located outside the rotating shaft. One side of the turntable bearing away from the small impeller is fixedly connected to an inner pipe. At least one plane is provided around the inner pipe along the axial direction of the inner pipe. A return spring is provided inside the inner pipe and is located between the inner pipe and the support seat. An outer pipe is provided on the support seat and is slidably connected to the outside of the inner pipe and is arranged corresponding to the inner pipe. The outside of the outer pipe is rotatably connected to a rotating sleeve. A number of inclined surfaces corresponding to the channel openings are opened on the rotating sleeve. At the high point of the inclined surface, a pressing portion is installed on the turntable bearing and is in contact with the inclined surface. Connecting rods fixed to the rotating portion are provided around the rotating sleeve. A blocking portion is provided outside the small impeller. When the flow rate inside the pipe is small, the blocking portion blocks the water flow in other areas inside the pipe, so that all the water flows backward through the centralized pipe body, further concentrating the flowing water, making all of it pass through the centralized pipe body provided with the small impeller, and correspondingly increasing the flow rate of the water flowing towards the small impeller, making the small impeller rotate faster; when the flow rate inside the pipe gradually increases, due to the existence of the blocking portion, the water inside the pipe all passes through the small impeller inside the centralized pipe body, so that the water flow impact force received by the small impeller gradually increases. While rotating at a high speed, the small impeller gradually slides backward relative to the rotating shaft until the sliding block finally slides into the self-rotating groove, causing the small impeller to disengage from the rotating shaft and not perform transmission. During the above sliding process, the small impeller drives the pressing portion on the turntable bearing to move backward, and the pressing portion acts on the inclined surface. After the inclined surface is stressed, the rotating sleeve rotates, and the rotating sleeve drives the rotating portion to rotate through the connecting rod, so that the channel openings on the blocking portion are opened, allowing some of the water flow inside the pipe to flow backward through the channel openings, thereby accelerating the water flow rate inside the pipe and ensuring a normal water supply speed. At this time, due to the increase in water flow, the magnet mounting seat and the magnet are correspondingly driven to rotate by the large impeller.

[0012] Preferably, both the blocking part and the rotating part are disc structures. A limiting part is arranged on one side of the blocking part facing the rotating part and surrounds the periphery of the blocking part. A rotating groove is formed on the side of the limiting part facing the rotating shaft. The rotating part is rotatably connected in the rotating groove. The disc-structured blocking part and rotating part can be adapted to the pipe body, improving the water blocking ability. At the same time, the rotating groove is provided, making the rotating part and the blocking part fit more tightly, and at the same time making the rotating part clamped on the blocking part, while the blocking part is installed in the pipe body, preventing the rotating part from moving backward and deviating from the sealing position after being impacted by the water flow.

[0013] Preferably, a drainage part is arranged at one end of the blocking part facing the large impeller. A water outlet channel corresponding to the channel opening is formed on the drainage part. A drainage surface is arranged on one side of the drainage part facing the large impeller and is inclined from the outside to the inside gradually towards the central pipe body. The inclined drainage surface is provided to further increase the water flow impact force towards the small impeller, ensuring that the small impeller can be driven to rotate even under the condition of small water flow, and thus ensuring the rotation and power generation of the rotating shaft and the magnet.

[0014] Preferably, the power supply module is a lithium battery electrically connected to the electric meter.

[0015] The beneficial effects of the present invention are as follows: In the present invention, there are a large impeller and a small impeller that can drive the magnet to rotate. When the flow rate is small, the small impeller drives the magnet to rotate to change the magnetic field size around the induction coil, and then generates electricity for the power supply module to use; at the same time, a blocking part for concentrating the water flow is arranged outside the small impeller, and then all the water flow is concentrated towards the small impeller at low flow rates, thus ensuring the continuous rotation of the small impeller; the small impeller can slide left and right on the rotating shaft. When the flow rate increases, the water flow velocity increases, increasing the impact force on the small impeller. As a result, the small impeller overcomes the elastic force of the return spring and slides to the right, thereby driving the rotating part to rotate through the pressing part and the inclined surface, making the rotating port correspond to the channel opening, and then enabling part of the water flow to flow out from the channel opening and the rotating port, thus accelerating the outflow of the liquid in the pipe body, and then switching to the power generation mode in which the large impeller drives the magnet to rotate. Description of the Drawings

[0016] Figure 1 is a structural schematic diagram of the present invention;

[0017] Figure 2 is an exploded view of the pipe body;

[0018] Figure 3 is a structural schematic diagram of the coil support frame, large impeller, support frame, blocking part and support seat;

[0019] Figure 4 is Figure 3 an enlarged view of part B in

[0020] Figure 5Schematic diagram of the structure of the coil support frame and the induction coil mounting seat;

[0021] Figure 6 Schematic diagram of the structure of the support frame;

[0022] Figure 7 Front view of the large impeller;

[0023] Figure 8 For Figure 7 Enlarged view of part A in

[0024] Figure 9 Schematic diagram of the structure of the blocking part and the rotating shaft;

[0025] Figure 10 Cross-sectional view of the blocking part, rotating part, small impeller and support seat;

[0026] Figure 11 For Figure 10 Enlarged view of part C in

[0027] Figure 12 Schematic diagram of the structure of the blocking part and the rotating part;

[0028] Figure 13 Schematic diagram of the structure of the support seat;

[0029] Figure 14 Schematic diagram of the structure of the drainage part.

[0030] Explanation of reference numerals: 1, water meter; 2, pipe body; 4, support frame; 4-1, frame body; 4-2, impeller seat; 4-3, shaft hole; 4-4, mounting boss; 4-5, mounting hole; 5, large impeller; 6, rotating shaft; 7, magnet; 8, induction coil; 9, small impeller; 11, coil support frame; 12, induction coil mounting seat; 13, winding groove; 14, stepped surface; 15, flange part; 16, sleeve; 17, clamping part; 18, connecting groove; 19, pawl; 20, central shaft; 21, limiting tooth; 22, limiting part; 23, arc part; 24, limiting surface; 25, blocking part; 26, centralized pipe body; 27, channel opening; 28, rotating part; 29, rotating opening; 30, support seat; 31, turntable bearing; 32, inner pipe; 33, plane; 34, return spring; 35, outer pipe; 36, rotating sleeve; 37, inclined surface; 38, pressing part; 39, connecting rod; 40, limiting part; 41, rotating groove; 42, drainage part; 43, water outlet channel; 44, drainage surface; 45, sliding groove; 46, sliding block; 47, magnet mounting seat; 48, self-rotating groove; 49, guiding surface. Detailed implementation manners

[0031] The present invention will be further described below with reference to the accompanying drawings:

[0032] Embodiment 1:

[0033] Referring to the attached drawings: In this embodiment, a self-powered large-caliber water meter includes a pipe body 2 in which a water meter 1 is installed. The water meter 1 can be an ultrasonic water meter. As Figure 1 shown, a support frame 4 is fixedly connected to the inner side of the pipe body 2. A large impeller 5 is rotatably connected to the outer side of the support frame 4. The large impeller 5 is installed near the water inlet end of the pipe body 2 to absorb the water flow impact ahead. The support frame 4 includes a frame body 4-1 fixedly connected to the inner side of the pipe body 2 and integrally formed by a plurality of interlaced rings and connecting rods, and an impeller seat 4-2 installed at the central position inside the frame body 4-1. A shaft hole 4-3 is opened at the central position inside the impeller seat 4-2. A rotating shaft 6 is rotatably connected to the shaft hole 4-3 through a bearing. An installation boss 4-4 protruding from the impeller seat 4-2 is provided on the impeller seat 4-2. The installation boss 4-4 is integrally provided with the impeller seat 4-2. The front end of the rotating shaft 6 passes through the large impeller 5 and is fixedly connected with a magnet 7. The rear end of the rotating shaft 6 is connected with a small impeller 9. The small impeller 9 is used to absorb the water flow impact behind the large impeller 5 and drive the rotating shaft 6 to rotate. Among them, the water flow entering the pipe body 2 first flows through the large impeller 5. The water flow passing through under the action of the blades of the large impeller 5 generates a certain rotational flow, thereby bringing a greater driving force to the small impeller behind. The rotating shaft 6 passes through the small impeller 9 and is rotatably connected to a support seat 30 installed in the pipe body 2. An installation hole 4-5 corresponding to the installation boss 4-4 is opened on the side of the large impeller 5 away from the magnet 7. The installation boss 4-4 is rotatably connected in the installation hole 4-5 through a bearing, and then the large impeller 5 is installed on the outer side of the support frame 4.

[0034] The magnet 7 is fixedly connected to the rotating shaft 6 through a magnet mounting seat 47. The magnet mounting seat 47 can be a circular ring structure. The magnets 7 are spaced apart on the inner wall of the magnet mounting seat 47. A ratchet device for driving the magnet 7 to perform one-way transmission is installed on the large impeller 5. The ratchet device includes a pawl 19 rotatably connected to the outer surface of the large impeller 5 through a central shaft 20. A limiting tooth 21 protruding and corresponding to the pawl 19 is provided on the outer side of the magnet mounting seat 47. A torsion spring is provided on the outer side of the central shaft 20. The two connecting ends of the torsion spring are respectively installed on the pawl 19 and the large impeller 5, so that the torsion spring is in a state of being caught in the limiting tooth 21 when the large impeller 5 rotates. A limiting portion 22 located outside the pawl 19 is provided on the outer surface of the large impeller 5. As Figure 7 and 8, on the side of the magnet mount 47 away from the rotation axis 6, there is a cavity for accommodating the induction coil 8, such that the magnet 7 is arranged around the induction coil 8. The limiting part 22 can be a ring surrounding the limiting teeth 21. On the side of the pawl 19 away from the limiting teeth 21, there is an arc part 23. On the side of the arc part 23 opposite to the rotation direction of the large impeller 5, there is a limiting surface 24 in contact with the limiting part 22 for limiting. When the large impeller 5 rotates clockwise under the action of water flow, the pawl 19 rotates clockwise relative to the limiting teeth 21. At this time, the limiting surface 24 is stuck on the inner surface of the ring and cannot rotate further. Thus, when the large impeller 5 continues to rotate, it drives the limiting teeth 21, the magnet mount 47 and the magnet 7 to rotate clockwise;

[0035] Among them, outside the induction coil 8, there is a coil support frame 11 installed inside the pipe body 2. The coil support frame 11 is also integrally formed by a plurality of intersecting rings and connecting rods. On the side of the coil support frame 11 facing the magnet 7, there is an induction coil mount 12 located in the cavity. Around the induction coil mount 12, there are several wire grooves 13 arranged parallel to the axis of the magnet 7. The induction coil 8 is wound outside the wire grooves 13. The induction coil 8 is a wire coil wound in the wire grooves 13 in sequence. During use, the magnet is rotated by the large impeller 5 or the small impeller 9, thereby changing the magnetic field magnitude outside the induction coil 8, so as to form an induced current in the induction coil 8. The induced current is then stored and transported through a power supply module connected to the induction coil 8. The power supply module can be a lithium battery connected to the electric meter for power supply;

[0036] Preferably, at the front and rear ends inside the pipe body 2, there are outwardly expanding stepped surfaces 14. Around the support frame 4 and the coil support frame 11, there are flange parts 15 corresponding to the stepped surfaces 14. The flange parts 15 are fixedly connected to the stepped surfaces 14 by screws, thereby realizing the installation and fixation of the support frame 4 and the coil support frame 11.

[0037] Embodiment Two:

[0038] Compared with Embodiment One, in this embodiment, in order to eliminate the stepped surface formed between the support frame 4 and the coil support frame 11 and the inner wall of the pipe body 2 in Embodiment One, sleeves 16 covering the flange parts 15 are provided at the front and rear ends inside the pipe body 2. The outer end of the sleeve 16 is flush with the outer end plane of the pipe body 2. In order to facilitate the positioning and installation of the sleeve 16, a protruding clamping part 17 is provided on the flange part 15, and a clamping groove 18 corresponding to the clamping part 17 is opened on the sleeve 16. During installation, the sleeve 16 is directly inserted into the pipe body 2 correspondingly, such that the clamping part 17 is snapped into the clamping groove 18. Finally, pipe bodies are respectively connected to both ends of the pipe body 2, and the sleeve 16 is then limited between the outer end face of the connecting pipe body and the flange part 15;

[0039] In order to fully ensure that the pipe body can drive the small impeller to rotate at a small water flow rate, and can quickly provide a large water flow in the case of large flow requirements, in this embodiment, a blocking portion 25 fixedly connected inside the pipe body 2 is provided outside the small impeller 9. A central pipe body 26 for accommodating the small impeller 9 is provided at the central position of the blocking portion 25. A number of uniformly arranged channel openings 27 are formed on the blocking portion 25. A rotating portion 28 is covered outside the channel openings 27. Rotating openings 29 staggered with the channel openings 27 are formed on the rotating portion 28. The blocking portion 25 and the rotating portion 28 can be in a disc structure. Among them, a water guiding portion 42 is provided at one end of the blocking portion 25 facing the large impeller 5. A water outlet channel 43 corresponding to the channel openings 27 is formed on the water guiding portion 42. A water guiding surface 44 inclined gradually from the outside to the inside towards the central pipe body 26 is provided on one side of the water guiding portion 42 facing the large impeller 5. Thus, in the case of a small flow rate, the liquid is directly guided to the small impeller 9 in the central pipe body 26, ensuring that the small impeller 9 can also be driven to rotate by the water flow in the case of a small flow rate;

[0040] Preferably, the rotating portion 28 is arranged on the side away from the water inlet direction to reduce the impact force of the water flow on the rotating portion 28. A limiting portion 40 arranged around the periphery of the blocking portion 25 is provided on one side of the blocking portion 25 facing the rotating portion 28. A rotating groove 41 is formed on the side of the limiting portion 40 facing the rotating shaft 6. The rotating portion 28 is rotatably connected in the rotating groove 41. The rotating portion 28 is further limited by the limiting portion 40, so that the rotating portion 28 is tightly attached to the blocking portion 25, thereby ensuring the sealing effect of the channel openings 27. When the normal small-flow water passes through, the rotating openings 29 on the rotating portion 28 are staggered with the channel openings 27, so that the channel openings 27 are closed, and the water flow all passes through the small impeller 9 in the central pipe body 26 and then flows out of the pipe body 2;

[0041] Refer to the appendix Figure 3 、 4, 9, and 12. A sliding groove 45 is provided at a position near the small impeller 9 outside the rotation axis 6. On the side of the sliding groove 45 away from the large impeller 5, there is a self-rotation groove 48 opened outside the rotation axis 6. At the connection of the sliding groove 45 and the self-rotation groove 48, there are guiding surfaces 49 located on both side walls of the sliding groove 45. The small impeller 9 is provided with a sliding block 46 slidably connected in the sliding groove 45. On the side of the small impeller 9 away from the water inlet direction, there is a turntable bearing 31 located outside the rotation axis 6. The turntable bearing 31 can be directly welded to the outer plane of the small impeller 9. On the side of the turntable bearing 31 away from the small impeller 9, there is an inner tube 32 welded. Inside the inner tube 32, there is a return spring 34 located between the inner tube 32 and the support seat 30. Around the inner tube 32, there is at least one plane 33 arranged along the axial direction of the inner tube 32. The support seat 30 is provided with an outer tube 35 slidably connected to the outside of the inner tube 32 and corresponding to the inner tube 32. The outer tube 35 is adapted to the inner tube 32 and slidably connected to the outside of the inner tube 32. Due to the plane 33 on the outside of the inner tube 32, the inner tube 32 cannot rotate inside the outer tube 35, thereby restricting the rotation of one side of the turntable bearing 31 through the inner tube 32. The outer tube 35 is rotatably connected to a rotating sleeve 36. The rotating sleeve 36 is provided with a number of inclined surfaces 37 corresponding to the channel openings 27. At the high point of the inclined surface 37, there is a pressing portion 38 installed on the turntable bearing 31 and in contact with the inclined surface 37. The pressing portion 38 can be a rod protruding from the turntable bearing 31. Around the rotating sleeve 36, there is a connecting rod 39 fixedly connected to the rotating portion 28. When there is a large flow rate demand, the water flow velocity passing through the small impeller 9 gradually increases. As a result, the impact force on the small impeller 9 increases, causing the small impeller 9 to gradually slide into the self-rotation groove 48 under the action of the impact force, overcoming the elastic force of the return spring 34. The movement of the small impeller 9 drives the pressing portion 38 on the turntable bearing 31 to press against the inclined surface 37. The rotating ceramic tube 36 then rotates under the action of the inclined surface 37 and the pressing portion 38, thereby driving the connecting rod 39 and the rotating portion 28 to rotate, making the rotating opening 29 on the rotating portion 28 align with the channel opening 27. At this time, the sliding block 46 just completely enters the self-rotation groove 48, and the rotation of the small impeller 9 does not drive the rotation axis 6 to rotate. Part of the water flow then flows out through the channel opening 27. At this time, the flow rate inside the pipe increases, and the large flow rate correspondingly drives the large impeller 5 to rotate rapidly. Since all the liquid passing through the channel opening 27 and the concentrated pipe body 26 passes through the large impeller 5, the power generation efficiency and the utilization rate of the water flow are improved. At the same time, the pipe body can provide a larger water flow rate to ensure the demand for a large flow rate.

[0042] In the description and claims of the present invention, certain terms are used to refer to specific products. Those of ordinary skill in the art should understand that manufacturers may use different names to refer to the same components. This document does not intend to distinguish components that have the same function but different names. In the following description and claims for patent, words such as "comprising", "having", and "including" are open-ended terms, and thus should be construed to mean "including but not limited to...".

[0043] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A self-powered large-caliber water meter, comprising a pipe body (2) installed with a water meter (1), characterized in that: A support frame (4) is fixedly connected to the inner side of the pipe body (2). A large impeller (5) is rotatably connected to the outer side of the support frame (4). A rotating shaft (6) is rotatably connected to the inner side of the support frame (4). A magnet (7) is fixedly connected to the front end of the rotating shaft (6) after passing through the large impeller (5). The large impeller (5) is arranged inside the pipe body (2) to absorb the impact of the water flow ahead. The rear end of the rotating shaft (6) is connected to a small impeller (9). The small impeller (9) is used to absorb the impact of the water flow behind the large impeller (5) and drive the rotating shaft (6) to rotate. A ratchet device for driving the magnet (7) to perform unidirectional transmission is installed on the large impeller (5). An induction coil (8) fixedly connected inside the pipe body (2) and connected to the power supply module is arranged outside the magnet (7); A circular magnet mounting seat (47) connected to the rotating shaft (6) is arranged outside the magnet (7). The magnet (7) is spacedly installed on the inner wall of the magnet mounting seat (47). A cavity for accommodating the induction coil (8) is arranged on the side of the magnet mounting seat (47) away from the rotating shaft (6); The ratchet device includes a pawl (19) rotatably connected to the outer surface of the large impeller (5) through a central shaft (20). A torsion spring is arranged outside the central shaft (20). The two ends of the torsion spring are respectively installed on the pawl (19) and the large impeller (5). A limiting tooth (21) protruding and corresponding to the pawl (19) is arranged outside the magnet mounting seat (47). A limiting part is arranged on the outer surface of the large impeller (5) outside the pawl (19). An arc part (23) is arranged on the side of the pawl (19) away from the limiting tooth (21). A limiting surface (24) for contacting and limiting with the limiting part (22) is arranged on the side of the arc part (23) opposite to the rotating direction of the large impeller (5); Inside the small impeller (9), there is a sliding groove (45) opened on the outside of the rotating shaft (6). One side of the sliding groove (45) far from the large impeller (5) is connected to a self-rotating groove (48) opened on the outside of the rotating shaft (6). At the connection of the sliding groove (45) and the self-rotating groove (48), there are guiding surfaces (49) located on both side walls of the sliding groove (45). On the small impeller (9), there is a sliding block (46) slidably connected in the sliding groove (45). Outside the small impeller (9), there is a blocking part (25) fixedly connected to the inside of the pipe body (2). At the central position of the blocking part (25), there is a concentrated pipe body (26) for accommodating the small impeller (9). On the blocking part (25), there are a number of uniformly arranged channel openings (27). The outside of the channel openings (27) is covered with a rotating part (28). On the rotating part (28), there are rotating openings (29) arranged staggeredly with the channel openings (27). The rotating shaft (6) passes through the small impeller (9) and is rotatably connected to a support seat (30) installed in the pipe body (2). One end of the small impeller (9) is provided with a turntable bearing (31) located outside the rotating shaft (6). On the side of the turntable bearing (31) far from the small impeller (9), there is an inner pipe (32) fixedly connected. Around the inner pipe (32), there is at least one plane (33) arranged along the axial direction of the inner pipe (32). Inside the inner pipe (32), there is a return spring (34) located between the inner pipe (32) and the support seat (30). On the support seat (30), there is an outer pipe (35) slidably connected to the outside of the inner pipe (32) and corresponding to the inner pipe (32). The outside of the outer pipe (35) is rotatably connected to a rotating sleeve (36). On the rotating sleeve (36), there are a number of inclined surfaces (37) corresponding to the channel openings (27). At the high point of the inclined surface (37), there is a pressing part (38) installed on the turntable bearing (31) and in contact with the inclined surface (37). Around the rotating sleeve (36), there are connecting rods (39) fixedly connected to the rotating part (28).

2. The self-powered large-caliber water meter according to claim 1, characterized in that: The support frame (4) includes a frame body (4-1) fixedly connected to the inside of the pipe body (2) and an impeller seat (4-2) installed at the central position inside the frame body (4-1). At the central position inside the impeller seat (4-2), there is a shaft hole (4-3). The rotating shaft (6) is rotatably connected in the shaft hole (4-3) through a bearing. On the impeller seat (4-2), there is an installation boss (4-4) protruding from the impeller seat (4-2). On the side of the large impeller (5) far from the magnet (7), there is an installation hole (4-5) corresponding to the installation boss (4-4). The installation boss (4-4) is rotatably connected in the installation hole (4-5) through a bearing.

3. The self-powered large-caliber water meter according to claim 1, characterized in that: Outside the induction coil (8), there is a coil support frame (11) installed inside the pipe body (2). On the side of the coil support frame (11) facing the magnet, there is an induction coil mounting seat (12) located in the cavity. Around the induction coil mounting seat (12), there are several wire winding grooves (13) arranged parallel to the axis of the magnet (7). The induction coil (8) is wound around the outside of the wire winding grooves (13).

4. The self-powered large-caliber water meter according to claim 3, characterized in that: At the front and rear ends inside the pipe body (2), there are stepped surfaces (14). On the peripheries of the support frame (4) and the coil support frame (11), there are flange parts (15) fixedly connected to the stepped surfaces (14) by screws. At the front and rear ends inside the pipe body (2), there are sleeves (16) covering the flange parts (15). On the flange parts (15), there are protruding clamping parts (17). On the sleeves (16), there are clamping grooves (18) corresponding to the clamping parts (17). The outer end faces of the sleeves (16) and the outer end faces of the pipe body (2) are in the same vertical plane.

5. The self-powered large-caliber water meter according to claim 1, characterized in that: Both the blocking part (25) and the rotating part (28) are disc-shaped structures. On the side of the blocking part (25) facing the rotating part (28), there is a limiting part (40) arranged around the periphery of the blocking part (25). On the side of the limiting part (40) facing the rotating shaft (6), there is a rotating groove (41). The rotating part (28) is rotatably connected in the rotating groove (41).

6. The self-powered large-caliber water meter according to claim 1, characterized in that: At one end of the blocking part (25) facing the large impeller (5), there is a water guiding part (42). On the water guiding part (42), there is a water outlet channel (43) corresponding to the channel opening (27). On the side of the water guiding part (42) facing the large impeller (5), there is a water guiding surface (44) inclined gradually from the outside to the inside towards the concentrating pipe body (26).

7. The self-powered large-caliber water meter according to claim 1, characterized in that: The power supply module is a lithium battery electrically connected to the electric meter.

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