System for measuring DMA (direct memory access) community entrance flow through tandem type double remote water meters

Abstract

The utility model discloses a system for measuring DMA (direct memory access) community entrance flow through tandem type double remote water meters, and belongs to the technical field of pipe network flow measurement. The device comprises a reducing reducer, a small-caliber water meter, an expanding reducer and a large-caliber water meter which are sequentially mounted on a main pipeline in series, the small-caliber water meter is provided with a small-caliber water meter remote transmission device, and the large-caliber water meter is provided with a large-caliber water meter remote transmission device. And the small-caliber water meter remote transmission equipment and the large-caliber water meter remote transmission equipment are respectively in communication connection with the DMA leakage management system. The small-caliber water meter and the large-caliber water meter are connected in series on the main pipeline, the water meter remote transmission equipment is in communication connection with the DMA leakage management system, the flow of the water meters with the corresponding calibers is used as metering data in different flow ranges, and the metering precision of the flow at the entrance of the community is improved; and a change-over valve is not needed, the structure is simpler, installation is convenient, the installation cost is low, and stability and reliability are good.

Description

Technical Field

[0001] The utility model relates to a water supply metering device, and more specifically to a system for measuring the inlet flow of a DMA community using a series-connected double remote water meter. Background Art

[0002] A DMA community refers to a community that uses DMA (District Metering Area) leakage management technology, which installs high-precision electronic remote water meters on the community’s water inlet pipes to monitor the community’s water volume in real time. It is one of the effective ways to control water loss in urban water supply systems.

[0003] At present, the flow rate at the entrance of the community is mostly measured by a single-caliber water meter. The applicability of a single-caliber water meter is poor, especially at a small flow rate, the accuracy of the measurement cannot be guaranteed, and there is a problem of large measurement errors at a small flow rate, resulting in inaccurate measurement of water volume in the community, and large statistical errors in the production and sales difference rate and leakage rate. In response to this problem, a "compound water meter" has appeared in the prior art, such as a "self-powered compound water meter" disclosed in Chinese patent number ZL200720099963.7. The authorization announcement date of this patent application is July 30, 2008. It is mainly composed of a large flow water meter, a small flow water meter and a flow conversion valve. The flow conversion valve is placed between the water inlet and the water outlet inside the movement of the large flow water meter and assembled into one. The small flow water meter is connected to the large flow water meter using a telescopic sealing mechanism. When the flow rate is less than the set value, the reversing valve is closed, and only the small flow meter measures; when the flow rate is greater than the set value, the reversing valve is opened, and the large and small flow meters measure at the same time. The opening or closing of the reversing valve utilizes the pressure and buoyancy generated by the fluid flow to control the opening or closing of the valve core, thereby realizing the switching of the fluid metering pipeline.

[0004] The above-mentioned "compound water meter" is essentially a large-flow water meter connected in parallel with a small-flow water meter, and converted through a reversing valve. The mechanical component of the reversing valve is added, and the overall structure is relatively complex, with a high damage rate and a high installation cost. Summary of the invention

[0005] 1. Technical problems to be solved by the utility model

[0006] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a system for measuring the flow at the entrance of a DMA community by means of a series-type dual remote water meter. By adopting the technical solution of the utility model, a small-diameter water meter and a large-diameter water meter are designed in series on the main pipeline, and are communicated with the DMA leakage management system through a water meter remote transmission device. By means of the flow analysis function of the DMA leakage management system, the flow of water meters with corresponding diameters is used as metering data within different flow ranges, thereby improving the metering accuracy of the community entrance flow. In addition, there is no need to use a conversion valve, the structure is simpler, the installation is convenient, the installation cost is low, and the stability and reliability are good.

[0007] 2. Technical solution

[0008] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0009] The utility model discloses a system for measuring the inlet flow of a DMA community by serially connecting dual remote water meters, comprising a reducing reducer, a small-diameter water meter, an expanding reducer and a large-diameter water meter which are sequentially installed in series on a main pipeline, wherein the small-diameter water meter is provided with a small-diameter water meter remote transmission device, and the large-diameter water meter is provided with a large-diameter water meter remote transmission device, and the small-diameter water meter remote transmission device and the large-diameter water meter remote transmission device are respectively connected to communicate with a DMA leakage management system.

[0010] Furthermore, a pre-meter device is provided between the reducing reducer and the small-diameter water meter.

[0011] Furthermore, the pre-meter equipment includes a small-diameter valve and a telescopic water filter box connected in series.

[0012] Furthermore, the reducing reducer is a reducing pipe joint whose pipe diameter changes from large to small, and the expanding reducer is a reducing pipe joint whose pipe diameter changes from small to large.

[0013] Furthermore, the small-diameter water meter remote transmission device and the large-diameter water meter remote transmission device both use NB-IOT communication technology to communicate with the DMA leakage management system.

[0014] 3. Beneficial effects

[0015] Compared with the existing known technologies, the technical solution provided by the utility model has the following beneficial effects:

[0016] The utility model discloses a system for measuring the flow rate at the entrance of a DMA community by serially connecting dual remote transmission water meters, which comprises a reducing reducer, a small-diameter water meter, an expanding reducer and a large-diameter water meter which are sequentially installed in series on a main pipeline. The small-diameter water meter is provided with a small-diameter water meter remote transmission device, and the large-diameter water meter is provided with a large-diameter water meter remote transmission device. The small-diameter water meter remote transmission device and the large-diameter water meter remote transmission device are respectively connected to a DMA leakage management system for communication; the small-diameter water meter and the large-diameter water meter are designed to be connected to a DMA leakage management system for communication via the water meter remote transmission device, and with the help of the flow analysis function of the DMA leakage management system, the flow rate of water meters with corresponding diameters is used as metering data within different flow ranges, thereby improving the metering accuracy of the community entrance flow rate; and there is no need to use a conversion valve, so the structure is simpler, the installation is convenient, the installation cost is low, and the stability and reliability are good. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a schematic diagram of the structure principle of a system for measuring the inlet flow of a DMA community with a series-connected dual remote water meter according to the utility model;

[0018] Figure 2 The utility model is a flow metering principle schematic diagram of a system for measuring the flow at the entrance of a DMA community using a series of dual remote water meters.

[0019] Explanation of the symbols in the schematic diagram:

[0020] 1. Main pipeline; 2. Reducing reducer; 3. Small-diameter valve; 4. Telescopic water filter box; 5. Small-diameter water meter; 6. Small-diameter water meter remote transmission equipment; 7. Expanding reducer; 8. Large-diameter water meter; 9. Large-diameter water meter remote transmission equipment; 10. DMA leakage management system. DETAILED DESCRIPTION

[0021] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the drawings and embodiments.

[0022] [Example]

[0023] Combination Figure 1 As shown, a system of measuring the flow rate at the entrance of a DMA community by serial dual remote water meters in this embodiment comprises a reducing reducer 2, a small-diameter water meter 5, an expanding reducer 7 and a large-diameter water meter 8 which are sequentially installed in series on a main pipeline 1. The main pipeline 1 is connected to the small-diameter water meter 5 after the pipe diameter is reduced by the reducing reducer 2, and then is connected to the large-diameter water meter 8 after the pipe diameter is expanded by the expanding reducer 7, so that the pipe diameter of the pipeline matches the small-diameter water meter 5 and the large-diameter water meter 8. The small-diameter water meter 5 is provided with a small-diameter water meter remote transmission device 6 for remotely transmitting the flow data detected by the small-diameter water meter 5, and the large-diameter water meter 8 is provided with a large-diameter water meter remote transmission device 9 for remotely transmitting the flow data detected by the large-diameter water meter 8; the small-diameter water meter remote transmission device 6 and the large-diameter water meter remote transmission device 9 are respectively connected to the DMA leakage management system 10 for respectively transmitting the flow data detected by the small-diameter water meter 5 and the large-diameter water meter 8 to the DMA leakage management system 10. In this way, both the small-diameter water meter 5 and the large-diameter water meter 8 can generate flow data, which is analyzed by the DMA leakage management system 10. When the flow is in the small flow range accurately detected by the small-diameter water meter 5, the DMA leakage management system 10 uses the flow data detected by the small-diameter water meter 5 as the community entrance flow; conversely, when the flow is in the large flow range accurately detected by the large-diameter water meter 8, the DMA leakage management system 10 uses the flow data detected by the large-diameter water meter 8 as the community entrance flow.

[0024] The above-mentioned small-diameter water meter remote transmission device 6, large-diameter water meter remote transmission device 9 and DMA leakage management system 10 are all existing technologies. With the help of the flow analysis function of the DMA leakage management system, the corresponding caliber water meter flow is used as the metering data within different flow ranges, thereby improving the metering accuracy of the flow at the entrance of the community. In addition, the small-diameter water meter 5 and the large-diameter water meter 8 are designed in series on the main pipeline 1, without the need for a conversion valve, and the structure is simpler, easy to install, low installation cost, and good stability and reliability.

[0025] Reference Figure 1 As shown, a pre-meter device is also provided between the above-mentioned reducing head 2 and the small-diameter water meter 5. The pre-meter device may include a small-diameter valve 3 and a telescopic water filter box 4 connected in series. The small-diameter valve 3 may control the on-off of the water supply at the entrance of the community. The telescopic water filter box 4 may filter impurities in the water, protect the small-diameter water meter 5 and the large-diameter water meter 8 from being damaged by solid impurities, and ensure the normal and accurate operation of the small-diameter water meter 5 and the large-diameter water meter 8.

[0026] The above-mentioned reducing reducer 2 is a reducing pipe joint for changing the pipe diameter from large to small, and the expanding reducer 7 is a reducing pipe joint for changing the pipe diameter from small to large. The pipe diameter of the pipe can be changed by the reducing pipe joint, so as to match water meters of different diameters, and the structure is simple and easy to install.

[0027] The connection between the small-diameter water meter remote transmission device 6 and the large-diameter water meter remote transmission device 9 and the DMA leakage management system 10 can be wireless or wired. The wireless connection can be a network connection such as WiFi, and the wired connection can be Ethernet, RS485, and optical fiber communication. Specifically in this embodiment, the small-diameter water meter remote transmission device 6 and the large-diameter water meter remote transmission device 9 are both connected to the DMA leakage management system 10 by NB-IOT communication technology. NB-IOT communication technology is an existing technology, which has the characteristics of wide coverage, fast speed, low cost, low power consumption, stable communication, etc., and is convenient for controlling the water meter through the DMA leakage management system 10.

[0028] Reference Figure 2As shown, when improving the original DMA community entrance flow metering device, first determine the position of the DMA community entrance main pipeline 1 according to the community pipe network drawing, then install a reducing reducer 2 at the community entrance of the main pipeline 1, so that the reduced diameter end of the reducing reducer 2 is compatible with the water inlet diameter of the small-diameter water meter 5, and install pre-equipment such as a small-diameter valve 3 and a telescopic water filter box 4; then install the small-diameter water meter 5 and add a small-diameter water meter remote transmission device 6; then install an expanding reducer 7 at the water outlet end of the small-diameter water meter 5, so that the expanded diameter end of the expanding reducer 7 is compatible with the water inlet diameter of the large-diameter water meter 8; then install the large-diameter water meter 8 and add a large-diameter water meter remote transmission device 9. Finally, the small-diameter water meter remote transmission device 6 and the large-diameter water meter remote transmission device 9 are connected to the original DMA community DMA leakage management system 10. When the main pipeline 1 has a small flow rate, the DMA leakage management system 10 uses the flow rate detected by the small-diameter water meter 5 as the flow rate data at the entrance of the community; when the main pipeline 1 has a large flow rate, the DMA leakage management system 10 uses the flow rate detected by the large-diameter water meter 8 as the flow rate data at the entrance of the community. In this way, the small-diameter water meter 5 can accurately detect a small flow rate, while the large-diameter water meter 8 can accurately detect a large flow rate, thereby improving the flow measurement accuracy at the entrance of the community. The flow ranges of large and small flows can be determined according to the ranges of the large-diameter water meter 8 and the small-diameter water meter 5.

[0029] The utility model is a system for measuring the flow rate at the entrance of a DMA community with a series of dual remote water meters, which overcomes the problem of inaccurate detection of small flow rates by large-caliber water meters. The small-caliber water meter and the large-caliber water meter are designed in series on the main pipeline, and the water meter remote transmission device is used to communicate with the DMA leakage management system. With the help of the flow analysis function of the DMA leakage management system, the flow rate of the corresponding caliber water meter is used as the metering data within different flow ranges, which improves the metering accuracy of the community entrance flow and is conducive to accurately monitoring the leakage situation in the community; and there is no need to use a conversion valve, the structure is simpler, the installation is convenient, the installation cost is low, and the stability and reliability are good.

[0030] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in the field are inspired by it and design structural methods and embodiments similar to the technical solution without creative design without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A system for measuring the flow rate at the entrance of a DMA community using dual remote water meters in series, characterized by: The invention comprises a reducing reducer (2), a small-diameter water meter (5), an expanding reducer (7) and a large-diameter water meter (8) which are sequentially installed in series on a main pipeline (1); the small-diameter water meter (5) is provided with a small-diameter water meter remote transmission device (6); the large-diameter water meter (8) is provided with a large-diameter water meter remote transmission device (9); the small-diameter water meter remote transmission device (6) and the large-diameter water meter remote transmission device (9) are respectively connected to a DMA leakage management system (10) for communication.

2. The system for measuring the flow rate at the entrance of a DMA community by using a series of dual remote water meters according to claim 1 is characterized in that: A pre-meter device is also provided between the reducing reducer (2) and the small-diameter water meter (5).

3. The system for measuring the flow rate at the entrance of a DMA community by using a series of dual remote water meters according to claim 2 is characterized in that: The pre-meter equipment comprises a small-caliber valve (3) and a telescopic water filter box (4) connected in series.

4. The system for measuring the flow rate at the entrance of a DMA community by using a series of dual remote water meters according to claim 1 is characterized in that: The reducing reducer (2) is a reducing pipe joint whose pipe diameter changes from large to small, and the expanding reducer (7) is a reducing pipe joint whose pipe diameter changes from small to large.

5. The system for measuring the flow rate at the entrance of a DMA community by using a series of dual remote water meters according to claim 1 is characterized in that: The small-caliber water meter remote transmission device (6) and the large-caliber water meter remote transmission device (9) are both connected to the DMA leakage management system (10) by using NB-IOT communication technology.

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