CN-122029402-A - Water meter

CN122029402ACN 122029402 ACN122029402 ACN 122029402ACN-122029402-A

Abstract

The water meter is provided with a measurement flow path (10) for flowing water as a fluid to be measured, a flow rate measurement unit (21) for measuring the instantaneous flow rate of water flowing through the measurement flow path (10), a flow rate pattern storage unit (24) for storing a first flow rate pattern indicating the change with time of a measurement value when the flow rate is zero, a water leakage determination unit (25) for determining the presence or absence of water leakage based on a second flow rate pattern indicating the change with time of the measurement value obtained by the flow rate measurement unit (21) and the first flow rate pattern stored in the flow rate pattern storage unit (24), a display unit (26) for displaying predetermined information when it is determined that water leakage exists in the water leakage determination unit (25), and a meter communication unit (27) for notifying the occurrence of water leakage to a central device (80) for managing water leakage.

Inventors

FUJII HIROSHI
NAKABAYASHI YUJI
Shi Guoren
MATSUDA MASATAKA
Takata Hiroya

Assignees

松下知识产权经营株式会社

Dates

Publication Date: 20260512
Application Date: 20241106
Priority Date: 20231109

Claims (5)

1. A water meter is provided with: A measurement flow path through which water, which is a fluid to be measured, flows; a flow rate measurement unit that measures an instantaneous flow rate of water flowing through the measurement flow path; A flow rate pattern storage unit that stores a first flow rate pattern indicating a change with time in a measurement value when the flow rate is zero; A water leakage determination unit that determines whether or not there is water leakage based on a second flow pattern indicating a change with time of the measurement value obtained by the flow measurement unit and the first flow pattern stored in the flow pattern storage unit; a display unit for displaying predetermined information when it is determined that there is a water leak in the water leak determination unit, and And a communication unit for notifying the center for managing water leakage of occurrence of water leakage.
2. The water meter of claim 1, wherein, Further comprises a pair of ultrasonic transceivers arranged in the measuring flow path, The flow rate measuring unit measures a flow rate based on a time taken for an ultrasonic wave to travel between one of the pair of ultrasonic transceivers and the other ultrasonic transceiver.
3. The water meter of claim 1, further comprising: a water temperature acquisition unit for acquiring the temperature of water flowing in the measurement flow path, and A water pressure acquisition unit that acquires the pressure of water flowing through the measurement flow path, The water leakage determination unit determines whether or not there is water leakage based on the first flow pattern, the second flow pattern, the temperature of the water acquired by the water temperature acquisition unit, and the pressure of the water acquired by the water pressure acquisition unit.
4. The water meter of claim 1, wherein, Further comprising a vibration acquisition unit that acquires vibration of the measurement flow path, The water leakage determination unit determines whether or not there is water leakage based on the first flow pattern, the second flow pattern, and the vibration acquired by the vibration acquisition unit.
5. The water meter of claim 1, wherein, And a shut-off valve for blocking and releasing the flow of water in the measurement flow path, When it is determined that there is water leakage in the water leakage determination unit, the flow of water in the measurement flow path is blocked by the shutoff valve.

Description

Water meter Technical Field The present disclosure relates to a water meter. Background Conventionally, water used in each house passes through a main pipe extending from a water supply plant, is branched into branch pipes for each target area, and is supplied to each house via a lead-in pipe branched from the branch pipe. In each house, a water meter is provided in the inlet pipe for each house in order to measure the amount of water used in the house. As for such a water meter, for example, as disclosed in patent document 1, a vane-type water meter is mainly used. Meanwhile, in recent years, as in patent document 2, the introduction of ultrasonic water meters has also been studied. Prior art literature Patent literature Patent document 1 Japanese patent laid-open publication No. 2005-837771 Patent document 2 Japanese patent laid-open publication No. 2003-139590 Disclosure of Invention Problems to be solved by the invention In the case of an impeller-type water meter as disclosed in patent document 1, a permanent magnet attached to an impeller rotates together with the impeller by a water flow to generate a rotating magnetic field, and the flow rate of water is measured by detecting the rotating magnetic field with a magnetic detection element. With such a structure, a minute water leakage cannot be detected. Patent document 2 discloses an ultrasonic water meter, but does not disclose a structure or a method for detecting a minute water leakage. In particular, the deterioration of the pipe or the deterioration of the seal at the joint portion of the pipe may cause very small water leakage. In addition, if such a minute water leakage occurs in a pipe downstream of the water meter, it is desirable to detect the minute water leakage. It is therefore an object of the present disclosure to provide a water meter capable of achieving accurate water leakage detection. Solution for solving the problem The water meter according to the present disclosure includes a measurement flow path through which water as a fluid to be measured flows, a flow rate measurement unit that measures an instantaneous flow rate of water flowing through the measurement flow path, a flow rate pattern storage unit that stores a first flow rate pattern indicating a change in a measured value of zero flow rate over time, a water leakage determination unit that determines whether or not water leakage occurs based on a second flow rate pattern indicating a change in the measured value obtained by the flow rate measurement unit over time and the first flow rate pattern stored in the flow rate pattern storage unit, a display unit that displays predetermined information when it is determined that water leakage occurs in the water leakage determination unit, and a communication unit that notifies a center that manages water leakage of occurrence. As described above, the water meter according to the present disclosure uses the flow rate measuring unit for measuring the instantaneous flow rate, and uses the first flow rate pattern when the flow rate is zero and the second flow rate pattern related to the flow rate currently being measured, so that it is possible to determine whether or not there is an extremely small water leak. Further, based on the result of the determination, the display on the display unit and the notification to the center can be performed, and thus, appropriate water leakage response can be expected. ADVANTAGEOUS EFFECTS OF INVENTION According to the present disclosure, a water meter capable of realizing accurate water leakage detection can be provided. Drawings Fig. 1 is a schematic view showing the structure of a water supply network to which a water meter of the present disclosure can be applied. Fig. 2 is a schematic diagram showing the structure of a water meter according to embodiment 1. Fig. 3 is a diagram for explaining water leakage determination by the water meter. Fig. 4 is a diagram for explaining water leakage determination by taking the temperature and pressure of water into consideration. Fig. 5 is a schematic diagram showing the structure of a water meter according to embodiment 2. Fig. 6 is a diagram for explaining water leakage determination by taking into consideration vibration of the measurement flow path. Detailed Description (Embodiment 1) A water meter according to an embodiment of the present disclosure will be described below with reference to the drawings. Fig. 1 is a schematic view showing the structure of a water supply network to which a water meter of the present disclosure can be applied. The water supply network 100 is a network for supplying domestic water from the water supply plant 90 that accumulates water purified by the water purification plant and flows the water downstream to the plurality of demand houses 95. Accordingly, in the water supply network 100, a main pipe 91 having a large diameter extends from the water supply plant 90, and a branching portion 92 is connected to a downstream