Device and method for detecting positive and negative rotation metering error of water meter

Abstract

The invention relates to the technical field of water meters, in particular to a device for detecting positive and negative rotation metering errors of a water meter, which comprises a water tank, a standard water meter and a variable-frequency water pump, the standard water meter and the to-be-tested water meter are communicated in series to form a test pipeline; one end of the test pipeline is serially connected with a first electromagnetic valve, and the other end of the test pipeline is serially connected with a second electromagnetic valve; one end of the test pipeline is serially connected with a third solenoid valve, and the other end of the test pipeline is serially connected with a fourth solenoid valve. According to the invention, continuous or intermittent forward and reverse rotation water flowing can be realized, an actual water use scene in a water supply network is simulated, and the technical problem that an existing water meter detection device cannot effectively simulate forward and reverse rotation of a water meter back and forth in an actual application scene is solved, so that the metering accuracy of an intelligent water meter with a bidirectional metering function is detected.

Description

Technical Field

[0001] The present invention relates to the technical field of water meters, and more particularly to a device and method for detecting forward and reverse measurement errors of water meters. Background Art

[0002] Existing water meter detection devices can generally only detect continuous or intermittent forward rotation and flow of water, but cannot detect continuous or intermittent reverse rotation and cannot detect intermittent forward and reverse rotation. For smart water meters with forward and reverse metering functions, due to the pressure fluctuation problem of the water supply network, existing water meter detection devices cannot effectively simulate the problem of water meters rotating back and forth in actual application scenarios. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a device for detecting the forward and reverse metering errors of a water meter, which can continuously or intermittently reverse the water flow, simulate the actual water use scenario in the water supply network, and solve the technical problem that the existing water meter detection device cannot effectively simulate the forward and reverse rotation of the water meter in the actual application scenario, so as to verify the metering accuracy of the smart water meter with a two-way metering function.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions: A device for detecting forward and reverse metering errors of a water meter comprises a water tank for containing test water, a standard water meter for detecting water consumption, and a variable frequency water pump for driving the test water to flow through the standard water meter; the standard water meter and the water meter to be tested are connected in series to form a test pipeline; a first solenoid valve for introducing the test water from the water tank into the test pipeline in forward flow is arranged in series at one end of the test pipeline, and a second solenoid valve for introducing the test water from the test pipeline into the water tank in forward flow is arranged in series at the other end of the test pipeline; a third solenoid valve for introducing the test water from the water tank into the test pipeline in reverse flow is arranged in series at one end of the test pipeline, and a fourth solenoid valve for introducing the test water from the test pipeline into the water tank in reverse flow is arranged in series at the other end of the test pipeline.

[0005] Preferably, it also includes a controller; the controller is electrically connected to the variable frequency water pump, the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve respectively.

[0006] Preferably, the standard water meter is a smart water meter, and the standard water meter is electrically connected to the controller.

[0007] Preferably, the water inlet of the variable frequency water pump is connected to the water outlet of the water tank, and the water outlet of the variable frequency water pump is connected to the water inlet of the first solenoid valve and the water inlet of the third solenoid valve respectively.

[0008] Another object of the present invention is to provide a method for detecting the forward and reverse metering error of a water meter, which uses the aforementioned device for detecting the forward and reverse metering error of a water meter to perform forward water flow mode detection, reverse water flow mode detection, or forward and reverse intermittent water flow mode detection on the water meter to be tested; Va represents the water consumption of the standard water meter, and Vi represents the water consumption of the water meter to be tested; When the water flow mode is detected in the forward rotation, the first solenoid valve and the second solenoid valve are controlled to be in the conducting state, and the third solenoid valve and the fourth solenoid valve are in the closed state. At this time, the metering error of the water meter to be tested = (Vi positive - Va positive) / Va positive; When detecting the reverse water flow mode, the first solenoid valve and the second solenoid valve are controlled to be in a closed state, and the third solenoid valve and the fourth solenoid valve are in a conducting state. At this time, the metering error of the water meter to be tested = (Vi reverse - Va reverse) / Va reverse; During the intermittent forward and reverse water flow mode detection, the first solenoid valve and the second solenoid valve are controlled to be in the same state, the third solenoid valve and the fourth solenoid valve are in the same state, and the first solenoid valve and the third solenoid valve are intermittently switched between the on state and the closed state. At this time, the metering error of the water meter to be tested = (Vi positive - Vi negative) - (Va positive - Va negative) / (Va positive - Va negative).

[0009] Preferably, the forward water flow mode includes a continuous or intermittent forward water flow mode, and the reverse water flow mode includes a continuous or intermittent reverse water flow mode.

[0010] Compared with the prior art, the present invention has the following advantages: in addition to simulating forward continuous or intermittent water use, the present invention can also simulate reverse continuous or intermittent water use, as well as forward and reverse intermittent water use scenarios, and can better evaluate and test the metering accuracy of smart water meters with forward and reverse metering functions, especially purely electronic smart water meters such as ultrasonic water meters and electromagnetic water meters. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of one embodiment of a device for detecting forward and reverse measurement errors of a water meter in the present invention; Figure 2 It is a schematic diagram of one embodiment of the device for detecting the forward and reverse measurement error of a water meter in the present invention when the device is in forward rotation and water flow; Figure 3 It is a schematic diagram of one embodiment of the device for detecting the forward and reverse measurement error of a water meter in the present invention when the device is in reverse flow; Figure 4 This is a schematic diagram of another embodiment of the device for detecting the forward and reverse measurement error of a water meter in the present invention. Figure 5 It is a connection diagram of a test pipeline in another embodiment of the present invention. DETAILED DESCRIPTION

[0012] The present invention is further described below in conjunction with embodiments, but the scope of protection claimed by the present invention is not limited to the scope described in the embodiments.

[0013] A device for detecting the forward and reverse measurement error of a water meter, such as Figure 1-3 As shown, it includes a water tank 1 for holding test water, a standard water meter 2 for detecting water consumption, and a variable frequency water pump 3 for driving the test water to flow through the standard water meter 2; the standard water meter 2 and the water meter to be tested 4 are connected in series to form a test pipeline 5; a first solenoid valve 6 for introducing the test water from the water tank 1 into the test pipeline 5 in a forward flow is arranged in series at one end of the test pipeline 5, and a second solenoid valve 7 for introducing the test water from the test pipeline 5 into the water tank 1 in a forward flow is arranged in series at the other end of the test pipeline 5; a third solenoid valve 8 for introducing the test water from the water tank 1 into the test pipeline 5 in a reverse flow is arranged in series at one end of the test pipeline 5, and a fourth solenoid valve 9 for introducing the test water from the test pipeline 5 into the water tank 1 in a reverse flow is arranged in series at the other end of the test pipeline 5. In addition, it also includes a controller (not shown in the figure); the controller is electrically connected to the variable frequency water pump 3, the first solenoid valve 6, the second solenoid valve 7, the third solenoid valve 8 and the fourth solenoid valve 9 respectively. The standard water meter 2 is an intelligent water meter, and the standard water meter 2 is electrically connected to the controller.

[0014] In this embodiment, the test pipeline 5, the first solenoid valve 6, the second solenoid valve 7, the third solenoid valve 8, the fourth solenoid valve 9 and the connecting conduit form an H-shaped water pipeline, and the H-shaped water pipeline has a water inlet and a water outlet connected to the water tank 1. An interface for installing the water meter 4 to be tested is reserved on the test pipeline 5.

[0015] The controller is used to collect information from the standard water meter 2 and the water meter to be tested 4, and to control the variable frequency water pump 3, the first solenoid valve 6, the second solenoid valve 7, the third solenoid valve 8 and the fourth solenoid valve 9, and then calculate and display the metering error of the water meter to be tested 4 in different working modes through relevant algorithms.

[0016] The controller can set the common flow rate of the water meter 4 to be tested by adjusting the rotation speed of the variable frequency water pump 3; by setting the switching mode of the four solenoid valves (the first solenoid valve 6, the second solenoid valve 7, the third solenoid valve 8 and the fourth solenoid valve 9), a continuous or intermittent forward water flow mode, a continuous or intermittent reverse water flow mode, and a forward and reverse intermittent water flow mode can be set; by reading the water consumption of the standard water meter 2 and the water meter 4 to be tested in the three modes, the measurement errors of the water meter 4 to be tested in the three modes can be calculated and displayed.

[0017] The water consumption of the standard water meter 2 is represented by Va, and the water consumption of the water meter to be tested 4 is represented by Vi.

[0018] The measurement error of the water meter 4 to be tested in the forward water flow mode = (Vi positive - Va positive) / Va positive.

[0019] The measurement error of the water meter 4 to be tested in the reverse water flow mode = (Vi reverse - Va reverse) / Va reverse.

[0020] In the forward and reverse intermittent water flow mode, the measurement error of the water meter 4 to be tested = (Vi positive - Vi negative) - (Va positive - Va negative) / (Va positive - Va negative).

[0021] The control method of the forward water flow mode is as follows: (1) The controller adjusts the speed of the variable frequency water pump 3, sets the rated flow of the test pipeline 5, sets the system operation time, and sets the test pipeline 5 to the forward rotation mode.

[0022] (2) According to the working mode set by the controller, the test pipeline 5 first opens the first solenoid valve 6 and the second solenoid valve 7, then closes the third solenoid valve 8 and the fourth solenoid valve 9, and starts the variable frequency water pump 3 to start forward timing water flow.

[0023] (3) When the controller timing time is reached, the variable frequency water pump 3 is turned off first, and then the first solenoid valve 6 and the second solenoid valve 7 are turned off. The forward water consumption of the standard water meter 2 and the water meter to be tested 4 is read through the controller, and the metering error of the water meter to be tested 4 in the forward mode is calculated.

[0024] The control method of reverse water flow mode is as follows: (1) The controller adjusts the speed of the variable frequency water pump 3, sets the rated flow of the test pipeline 5, sets the operating time of the system, and sets the test pipeline 5 to the reverse mode.

[0025] (2) According to the working mode set by the controller, the test pipeline 5 first opens the third solenoid valve 8 and the fourth solenoid valve 9, then closes the first solenoid valve 6 and the second solenoid valve 7, and starts the variable frequency water pump 3 to start reverse timing of water flow.

[0026] (3) When the controller timing time is reached, the variable frequency water pump 3 is turned off first, and then the third solenoid valve 8 and the fourth solenoid valve 9 are turned off. The reverse water consumption of the standard water meter 2 and the water meter to be tested 4 is read through the controller, and the metering error of the water meter to be tested 4 in the reverse mode is calculated.

[0027] The control method of forward and reverse water flow mode is as follows: (1) The controller adjusts the speed of the variable frequency water pump 3, sets the rated flow of the test pipeline 5, sets the forward time, stop time, reverse time and number of cycles, and sets the test pipeline 5 to the forward and reverse modes.

[0028] (2) According to the working mode set by the controller, the test pipeline 5 first opens the first solenoid valve 6 and the second solenoid valve 7, then closes the third solenoid valve 8 and the fourth solenoid valve 9, and starts the variable frequency water pump 3 to start the forward timing water flow; after the forward rotation time is reached, the variable frequency water pump 3 is paused, and then the first solenoid valve 6 and the second solenoid valve 7 are closed, the third solenoid valve 8 and the fourth solenoid valve 9 are opened, and the variable frequency water pump 3 is started to start the reverse timing water flow; after the reverse rotation time is reached, the variable frequency water pump 3 is paused, and then the forward rotation water flow is circulated again.

[0029] (3) When the controller reaches the number of forward and reverse water flow cycles, the variable frequency water pump 3 is turned off first, and then the first solenoid valve 6, the second solenoid valve 7, the third solenoid valve 8 and the fourth solenoid valve 9 are turned off in sequence. The net water consumption (forward water consumption - reverse water consumption) of the standard water meter 2 and the water meter to be tested 4 is read through the controller, and the metering error of the net water consumption of the water meter to be tested 4 in the forward and reverse modes is calculated.

[0030] In addition to simulating forward continuous or intermittent water use, the device provided by the present invention can also simulate reverse continuous or intermittent water use, as well as forward and reverse intermittent water use scenarios. It can better evaluate and test the metering accuracy of smart water meters with forward and reverse metering functions, especially purely electronic smart water meters such as ultrasonic water meters and electromagnetic water meters.

[0031] Furthermore, the water inlet of the variable frequency water pump 3 is connected to the water outlet of the water tank 1 , and the water outlet thereof is connected to the water inlet of the first solenoid valve 6 and the water inlet of the third solenoid valve 8 , respectively.

[0032] In another embodiment, the variable frequency water pump 3 can also be incorporated into the test pipeline 5, that is, the test pipeline 5 is formed by the variable frequency water pump 3, the standard water meter 2 and the water meter to be tested 4 being connected in series. At this time, there are many ways to connect the standard water meter 2, the variable frequency water pump 3 and the water meter to be tested 4 in the test pipeline 5, such as Figure 4-5 shown.

[0033] The present invention also provides a method for detecting the forward and reverse metering error of a water meter, which uses the aforementioned device for detecting the forward and reverse metering error of a water meter to perform forward water flow mode detection, reverse water flow mode detection, or forward and reverse intermittent water flow mode detection on the water meter 4 to be tested; Va represents the water consumption of the standard water meter, and Vi represents the water consumption of the water meter to be tested; When the water flow mode is detected in the forward rotation, the first solenoid valve 6 and the second solenoid valve 7 are controlled to be in the conducting state, and the third solenoid valve 8 and the fourth solenoid valve 9 are in the closed state. At this time, the metering error of the water meter to be tested = (Vi positive - Va positive) / Va positive; When detecting the reverse water flow mode, the first solenoid valve 6 and the second solenoid valve 7 are controlled to be in a closed state, and the third solenoid valve 8 and the fourth solenoid valve 9 are in a conducting state. At this time, the metering error of the water meter to be tested = (Vi reverse - Va reverse) / Va reverse; During the intermittent forward and reverse water flow mode detection, the first solenoid valve 6 and the second solenoid valve 7 are controlled to be in the same state, the third solenoid valve 8 and the fourth solenoid valve 9 are in the same state, and the first solenoid valve 6 and the third solenoid valve 8 are intermittently switched between the on state and the closed state. At this time, the metering error of the water meter to be tested = (Vi positive - Vi negative) - (Va positive - Va negative) / (Va positive - Va negative).

[0034] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A device for detecting forward and reverse measurement errors of a water meter, characterized in that: It comprises a water tank for containing test water, a standard water meter for detecting water consumption, and a variable frequency water pump for driving the test water to flow through the standard water meter; the standard water meter and the water meter to be tested are connected in series to form a test pipeline; a first solenoid valve for introducing the test water from the water tank into the test pipeline in a forward flow is arranged in series at one end of the test pipeline, and a second solenoid valve for introducing the test water from the test pipeline into the water tank in a forward flow is arranged in series at the other end of the test pipeline; a third solenoid valve for introducing the test water from the water tank into the test pipeline in a reverse flow is arranged in series at one end of the test pipeline, and a fourth solenoid valve for introducing the test water from the test pipeline into the water tank in a reverse flow is arranged in series at the other end of the test pipeline.

2. The device for detecting forward and reverse measurement errors of a water meter according to claim 1, characterized in that: It also includes a controller; the controller is electrically connected to the variable frequency water pump, the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve respectively.

3. The device for detecting forward and reverse measurement errors of a water meter according to claim 2, characterized in that: The standard water meter is an intelligent water meter, and the standard water meter is electrically connected to the controller.

4. The device for detecting forward and reverse measurement errors of a water meter according to claim 1, characterized in that: The water inlet end of the variable frequency water pump is communicated with the water outlet end of the water tank, and the water outlet end thereof is communicated with the water inlet end of the first solenoid valve and the water inlet end of the third solenoid valve respectively.

5. A method for detecting forward and reverse measurement errors of a water meter, characterized in that: The device for detecting the forward and reverse measurement error of a water meter according to any one of claims 1 to 4 is used to perform forward water flow mode detection, reverse water flow mode detection, or forward and reverse intermittent water flow mode detection on the water meter to be tested; Va is used to represent the water consumption of the standard water meter, and Vi is used to represent the water consumption of the water meter to be tested; When the water flow mode is detected in the forward rotation, the first solenoid valve and the second solenoid valve are controlled to be in the conducting state, and the third solenoid valve and the fourth solenoid valve are in the closed state. At this time, the metering error of the water meter to be tested = (Vi positive - Va positive) / Va positive; When detecting the reverse water flow mode, the first solenoid valve and the second solenoid valve are controlled to be in a closed state, and the third solenoid valve and the fourth solenoid valve are in a conducting state. At this time, the metering error of the water meter to be tested = (Vi reverse - Va reverse) / Va reverse; During the intermittent forward and reverse water flow mode detection, the first solenoid valve and the second solenoid valve are controlled to be in the same state, the third solenoid valve and the fourth solenoid valve are in the same state, and the first solenoid valve and the third solenoid valve are intermittently switched between the on state and the closed state. At this time, the metering error of the water meter to be tested = (Vi positive - Vi negative) - (Va positive - Va negative) / (Va positive - Va negative).

6. The method for detecting forward and reverse measurement errors of a water meter according to claim 5, characterized in that: The forward running mode includes a continuous or intermittent forward running mode, and the reverse running mode includes a continuous or intermittent reverse running mode.

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