阅读说明：本技术 循环供水系统的用户用水量的计量方法 (Method for metering water consumption of user of circulating water supply system ) 是由 林道汉 宋正荣 于 2021-09-15 设计创作，主要内容包括：本发明涉及一种循环供水系统的用户用水量的计量方法,包括以下步骤：在进水管和回水管之间安装流体计量表,流体计量表包括进水计量管和回水计量管,进水计量管安装在进水管上,回水计量管安装在回水管上；分别计算出超声波在进水计量管和回水计量管内传播的第一传播时间差和第二传播时间差；再计算出进水瞬时流量和出回水瞬时流量；判断进水瞬时流量是否小于回水瞬时流量,若判断为是,则将第一误差百分比与第一设定值进行比较,若判断为否,则将第二误差百分比与第二设定值进行比较,若第二误差百分比大于第二设定值,则进行计量,否则不进行计量。本发明能够有效提高用户用水量的计量准确性。(The invention relates to a method for metering water consumption of a user of a circulating water supply system, which comprises the following steps: a fluid meter is arranged between the water inlet pipe and the water return pipe, the fluid meter comprises a water inlet metering pipe and a water return metering pipe, the water inlet metering pipe is arranged on the water inlet pipe, and the water return metering pipe is arranged on the water return pipe; respectively calculating a first propagation time difference and a second propagation time difference of the ultrasonic waves propagated in the water inlet metering pipe and the water return metering pipe; then calculating the instantaneous flow of inlet water and the instantaneous flow of outlet water; and judging whether the instantaneous inflow is smaller than the instantaneous return, if so, comparing the first error percentage with a first set value, if not, comparing the second error percentage with a second set value, if so, metering, and otherwise, not metering. The invention can effectively improve the metering accuracy of water consumption of users.)

1. The utility model provides a measurement method of circulating water supply system's user water consumption, circulating water supply system includes inlet tube and wet return, and the end of intaking of inlet tube is connected with water main, and the play water end of inlet tube is connected with the branch pipe of registering one's residence, and the end of intaking of wet return is connected with the inlet tube, and the play water end and the water main of wet return are connected its characterized in that: the metering method comprises the following steps:

1) a fluid meter is arranged between the water inlet pipe and the water return pipe, the fluid meter comprises a water inlet metering pipe and a water return metering pipe, the water inlet metering pipe is arranged on the water inlet pipe, the water return metering pipe is arranged on the water return pipe, and the water inlet metering pipe and the water return metering pipe are both connected with ultrasonic transducer groups for receiving and transmitting ultrasonic waves;

2) acquiring the downstream propagation time and the upstream propagation time of ultrasonic waves in water flow inside the water inlet metering pipe by using an ultrasonic transducer group on the water inlet metering pipe, and making a difference between the upstream propagation time and the downstream propagation time of the ultrasonic waves in the water flow inside the water inlet metering pipe to obtain a first propagation time difference; acquiring the downstream propagation time and the upstream propagation time of the ultrasonic wave in the water flow in the return water metering pipe by using an ultrasonic transducer group on the return water metering pipe, and making a difference between the upstream propagation time and the downstream propagation time of the ultrasonic wave in the water flow in the return water metering pipe to obtain a second propagation time difference;

3) calculating the instantaneous flow of inlet water according to the first propagation time difference and the propagation velocity of the ultrasonic waves in the water flow in the water inlet metering pipe, and calculating the instantaneous flow of return water according to the second propagation time difference and the propagation velocity of the ultrasonic waves in the water flow in the return water metering pipe;

4) judging whether the instantaneous inflow flow is smaller than the instantaneous return flow, if so, executing the step 5), otherwise, executing the step 6);

5) calculating a first error percentage, if the first error percentage is larger than a first set value, indicating that the fluid meter is abnormal, and needing abnormal inspection; if the first error percentage is not less than the first set value, not processing;

the first error percentage is (backwater instantaneous flow-water inlet instantaneous flow)/water inlet instantaneous flow;

6) calculating a second error percentage, wherein if the second error percentage is greater than a second set value, the user is in a water using state, and the difference value between the measured intake instantaneous flow and the measured return instantaneous flow is used as the accumulated amount of the water consumption of the user; if the second error percentage is not greater than the second set value, the cumulative amount of the water consumption of the user is not measured;

the second error percentage is (inlet water instantaneous flow-backwater instantaneous flow)/inlet water instantaneous flow.

2. The method of claim 1 for metering water usage by a user of a recirculating water supply system, wherein: in the step 5), if the first error percentage is greater than the first set value, an alarm prompt is sent out.

3. The method of claim 1 for metering water usage by a user of a recirculating water supply system, wherein: the first error percentage and the second error percentage are both 1% -20%.

4. The method of claim 1 for metering water usage by a user of a recirculating water supply system, wherein: after the step 2) and before the step 3), correcting the propagation speed of the ultrasonic wave in the water flow inside the water inlet metering pipe and the propagation speed of the ultrasonic wave in the water flow inside the water return metering pipe;

the method for correcting the propagation speed of the ultrasonic wave in the water flow in the water inlet metering pipe comprises the following steps: acquiring the temperature of water flow in the water inlet metering pipe through a temperature sensor, and compensating and correcting the propagation speed of ultrasonic waves in the water flow in the water inlet metering pipe according to the acquired temperature of the water flow in the water inlet metering pipe;

the method for correcting the propagation speed of the ultrasonic wave in the water flow inside the return water metering pipe comprises the following steps: the temperature of water flow in the return water metering pipe is collected through a temperature sensor, and the propagation speed of ultrasonic waves in the water flow in the return water metering pipe is compensated and corrected according to the collected temperature of the water flow in the return water metering pipe.

5. The method for measuring the water consumption of the user of the circulating water supply system according to claim 4, wherein after the instantaneous water inlet flow and the instantaneous water return flow are obtained in the step 3), the instantaneous water inlet flow and the instantaneous water return flow are compensated and corrected;

the method for compensating and correcting the calculated water inlet instantaneous flow comprises the following steps: calculating a Reynolds number according to the acquired temperature of the water flow in the water inlet metering pipe and the water inlet instantaneous flow, and compensating and correcting the water inlet instantaneous flow by using the Reynolds number;

the method for compensating and correcting the calculated return water instantaneous flow comprises the following steps: and calculating the Reynolds number according to the acquired temperature of the water flow in the return water metering pipe and the return water instantaneous flow, and compensating and correcting the return water instantaneous flow by using the Reynolds number.

6. The method for measuring the water consumption of the user of the circulating water supply system according to claim 5, wherein the compensation of the corrected instantaneous water inlet flow and the corrected instantaneous water return flow is optimized;

the method for optimizing the compensated and corrected instantaneous water inlet flow comprises the following steps: adding the compensated and corrected instantaneous inflow water flow into a first data processing stack, acquiring N latest acquired flow data in the first data processing stack, removing the maximum value and the minimum value from the acquired N flow data to obtain N-2 flow data, then averaging the N-2 flow data, and multiplying the calculated average value by a weighting coefficient to obtain the optimal instantaneous inflow water flow;

the method for optimizing the compensated and corrected instantaneous flow of the backwater comprises the following steps: adding the compensated and corrected instantaneous backwater flow into a second data processing stack, acquiring N pieces of latest acquired flow data in the second data processing stack, removing the maximum value and the minimum value from the acquired N pieces of flow data to obtain N-2 pieces of flow data, then averaging the N-2 pieces of flow data, and multiplying the calculated average value by a weighting coefficient to obtain the optimal instantaneous backwater flow.

7. The method for measuring the water consumption of a user of a circulating water supply system according to claim 1, wherein the ultrasonic emission of the ultrasonic transducer groups on the water inlet measuring pipe and the water return measuring pipe is controlled by the same controller.

8. The method as claimed in claim 7, wherein the controller is further connected to a display for displaying the water consumption of the user.

9. The method as claimed in claim 7, wherein the controller is further provided with a communication module for transmitting the user water consumption to a remote management terminal.

10. The method as claimed in claim 9, wherein the communication module is a wired or wireless communication module.

Technical Field

The invention relates to the technical field of water flow metering, in particular to a method for metering water consumption of a user of a circulating water supply system.

Background

Along with the improvement of drinking water quality requirements of people, the application of pipeline drinking water systems in cities is more and more popularized. The pipeline direct drinking water system of current residential district generally adopts circulating water supply system, as shown in fig. 1, this circulating water supply system includes inlet tube and wet return, the end of intaking of inlet tube is connected with water main, the play water end of inlet tube is connected with the branch pipe of registering one's residence, the end of intaking of wet return is connected with the inlet tube, the play water end and the water main of wet return are connected, and set up fluid meter on the inlet tube and measure user's water consumption, but the unable accurate measurement user water consumption of current fluid meter's metering mode, can't satisfy the user demand.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that the water consumption of a user cannot be accurately measured by a measuring mode of a circulating water supply system in the prior art.

In order to solve the technical problems, the invention provides a method for metering the water consumption of a user of a circulating water supply system, the circulating water supply system comprises a water inlet pipe and a water return pipe, the water inlet end of the water inlet pipe is connected with a main water supply pipe, the water outlet end of the water inlet pipe is connected with a household branch pipe, the water inlet end of the water return pipe is connected with the water inlet pipe, and the water outlet end of the water return pipe is connected with the main water supply pipe, the metering method comprises the following steps:

1) a fluid meter is arranged between the water inlet pipe and the water return pipe, the fluid meter comprises a water inlet metering pipe and a water return metering pipe, the water inlet metering pipe is arranged on the water inlet pipe, the water return metering pipe is arranged on the water return pipe, and the water inlet metering pipe and the water return metering pipe are both connected with ultrasonic transducer groups for receiving and transmitting ultrasonic waves;

2) acquiring the downstream propagation time and the upstream propagation time of ultrasonic waves in water flow inside the water inlet metering pipe by using an ultrasonic transducer group on the water inlet metering pipe, and making a difference between the upstream propagation time and the downstream propagation time of the ultrasonic waves in the water flow inside the water inlet metering pipe to obtain a first propagation time difference; acquiring the downstream propagation time and the upstream propagation time of the ultrasonic wave in the water flow in the return water metering pipe by using an ultrasonic transducer group on the return water metering pipe, and making a difference between the upstream propagation time and the downstream propagation time of the ultrasonic wave in the water flow in the return water metering pipe to obtain a second propagation time difference;

3) calculating the instantaneous flow of inlet water according to the first propagation time difference and the propagation velocity of the ultrasonic waves in the water flow in the water inlet metering pipe, and calculating the instantaneous flow of return water according to the second propagation time difference and the propagation velocity of the ultrasonic waves in the water flow in the return water metering pipe;

4) judging whether the instantaneous inflow flow is smaller than the instantaneous return flow, if so, executing the step 5), otherwise, executing the step 6);

5) calculating a first error percentage, if the first error percentage is larger than a first set value, indicating that the fluid meter is abnormal, and needing abnormal inspection; if the first error percentage is not less than the first set value, not processing;

the first error percentage is (backwater instantaneous flow-water inlet instantaneous flow)/water inlet instantaneous flow;

6) calculating a second error percentage, wherein if the second error percentage is greater than a second set value, the user is in a water using state, and the difference value between the measured intake instantaneous flow and the measured return instantaneous flow is used as the accumulated amount of the water consumption of the user; if the second error percentage is not greater than the second set value, the cumulative amount of the water consumption of the user is not measured;

the second error percentage is (inlet water instantaneous flow-backwater instantaneous flow)/inlet water instantaneous flow.

In an embodiment of the present invention, in the step 5), if the first error percentage is greater than the first set value, an alarm is issued.

In one embodiment of the present invention, the first error percentage and the second error percentage are each 1% to 20%.

In an embodiment of the present invention, after step 2) and before step 3), the propagation speed of the ultrasonic wave in the water flow inside the water inlet metering pipe and the propagation speed of the ultrasonic wave in the water flow inside the water return metering pipe need to be corrected;

the method for correcting the propagation speed of the ultrasonic wave in the water flow in the water inlet metering pipe comprises the following steps: acquiring the temperature of water flow in the water inlet metering pipe through a temperature sensor, and compensating and correcting the propagation speed of ultrasonic waves in the water flow in the water inlet metering pipe according to the acquired temperature of the water flow in the water inlet metering pipe;

the method for correcting the propagation speed of the ultrasonic wave in the water flow inside the return water metering pipe comprises the following steps: the temperature of water flow in the return water metering pipe is collected through a temperature sensor, and the propagation speed of ultrasonic waves in the water flow in the return water metering pipe is compensated and corrected according to the collected temperature of the water flow in the return water metering pipe.

In an embodiment of the present invention, after the instantaneous water inlet flow and the instantaneous water return flow are obtained in step 3), compensation and correction are performed on the instantaneous water inlet flow and the instantaneous water return flow;

the method for compensating and correcting the calculated water inlet instantaneous flow comprises the following steps: calculating a Reynolds number according to the acquired temperature of the water flow in the water inlet metering pipe and the water inlet instantaneous flow, and compensating and correcting the water inlet instantaneous flow by using the Reynolds number;

the method for compensating and correcting the calculated return water instantaneous flow comprises the following steps: and calculating the Reynolds number according to the acquired temperature of the water flow in the return water metering pipe and the return water instantaneous flow, and compensating and correcting the return water instantaneous flow by using the Reynolds number.

In one embodiment of the invention, the compensated and corrected instantaneous flow of inlet water and instantaneous flow of return water are optimized;

the method for optimizing the compensated and corrected instantaneous water inlet flow comprises the following steps: adding the compensated and corrected instantaneous inflow water flow into a first data processing stack, acquiring N latest acquired flow data in the first data processing stack, removing the maximum value and the minimum value from the acquired N flow data to obtain N-2 flow data, then averaging the N-2 flow data, and multiplying the calculated average value by a weighting coefficient to obtain the optimal instantaneous inflow water flow;

the method for optimizing the compensated and corrected instantaneous flow of the backwater comprises the following steps: adding the compensated and corrected instantaneous backwater flow into a second data processing stack, acquiring N pieces of latest acquired flow data in the second data processing stack, removing the maximum value and the minimum value from the acquired N pieces of flow data to obtain N-2 pieces of flow data, then averaging the N-2 pieces of flow data, and multiplying the calculated average value by a weighting coefficient to obtain the optimal instantaneous backwater flow.

In one embodiment of the invention, the ultrasonic emission of the ultrasonic transducer groups on the water inlet measuring pipe and the water return measuring pipe is controlled by the same controller.

In one embodiment of the invention, the controller is further connected to a display for displaying the water usage by the user.

In one embodiment of the invention, the controller is further provided with a communication module, and the communication module is used for transmitting the water consumption of the user to a remote management end.

In one embodiment of the invention, the communication module is a wired or wireless communication module.

Compared with the prior art, the technical scheme of the invention has the following advantages:

according to the method for metering the water consumption of the user of the circulating water supply system, the fluid meter is arranged between the water inlet pipe and the water return pipe, and the water consumption of the user is calculated by utilizing the flow difference value of the water inlet pipe and the water return pipe, so that the water consumption of the user can be accurately metered under the circulating flowing running water state, and the metering accuracy of the water consumption of the user is improved.

Drawings

In order that the present disclosure may be more readily and clearly understood, reference will now be made in detail to the present disclosure, examples of which are illustrated in the accompanying drawings.

FIG. 1 is a view showing a structure of a metering structure of a circulating water supply system in the prior art

FIG. 2 is a view showing a metering structure of the circulating water supply system of the present invention;

FIG. 3 is a flow chart of a method of metering water usage by a user of the circulating water supply system of the present invention;

Detailed Description

The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.

Referring to fig. 2-3, the present embodiment discloses a method for measuring the amount of water used by a user of a circulating water supply system, the circulating water supply system includes a water inlet pipe and a water return pipe, the water inlet end of the water inlet pipe is connected with a main water supply pipe, the water outlet end of the water inlet pipe is connected with a household branch pipe, the water inlet end of the water return pipe is connected with the water inlet pipe, and the water outlet end of the water return pipe is connected with the main water supply pipe, the method includes the following steps:

1) a fluid meter is arranged between the water inlet pipe and the water return pipe, the fluid meter comprises a water inlet metering pipe and a water return metering pipe, the water inlet metering pipe is arranged on the water inlet pipe, the water return metering pipe is arranged on the water return pipe, and the water inlet metering pipe and the water return metering pipe are both connected with ultrasonic transducer groups for ultrasonic transceiving;

2) acquiring the downstream propagation time and the upstream propagation time of ultrasonic waves in water flow inside the water inlet metering pipe by using an ultrasonic transducer group on the water inlet metering pipe, and making a difference between the upstream propagation time and the downstream propagation time of the ultrasonic waves in the water flow inside the water inlet metering pipe to obtain a first propagation time difference; acquiring the downstream propagation time and the upstream propagation time of the ultrasonic wave in the water flow in the return water metering pipe by using an ultrasonic transducer group on the return water metering pipe, and making a difference between the upstream propagation time and the downstream propagation time of the ultrasonic wave in the water flow in the return water metering pipe to obtain a second propagation time difference;

3) calculating the instantaneous flow of inlet water according to the first propagation time difference and the propagation velocity of the ultrasonic waves in the water flow in the water inlet metering pipe, and calculating the instantaneous flow of return water according to the second propagation time difference and the propagation velocity of the ultrasonic waves in the water flow in the return water metering pipe;

4) judging whether the instantaneous inflow flow is smaller than the instantaneous return flow, if so, executing the step 5), otherwise, executing the step 6);

5) calculating a first error percentage, if the first error percentage is larger than a first set value, indicating that the fluid meter has abnormality, and if the fluid meter possibly has reverse installation or other abnormality, performing abnormality check; if the first error percentage is not less than the first set value, the normal flow fluctuation is considered, and the processing is not carried out;

the first error percentage is (backwater instantaneous flow-water inlet instantaneous flow)/water inlet instantaneous flow;

6) calculating a second error percentage, wherein if the second error percentage is greater than a second set value, the user is in a water using state, and the difference value between the measured intake instantaneous flow and the measured return instantaneous flow is used as the accumulated amount of the water consumption of the user; if the second error percentage is not greater than the second set value, the cumulative amount of the water consumption of the user is not measured;

the second error percentage is (inlet water instantaneous flow-backwater instantaneous flow)/inlet water instantaneous flow.

Repeating the steps 1) -6), and accumulating the accumulated amount of the water consumption of the user obtained in the step 6) to obtain the water consumption of the user in a certain period of time.

By the mode, the actual metering of the water consumption of the user can be effectively guaranteed through the arrangement of the first set value and the second set value, and the invalid metering is avoided.

According to the method for metering the water consumption of the user of the circulating water supply system, the fluid meter is arranged between the water inlet pipe and the water return pipe, and the flow difference value of the water inlet pipe and the water return pipe is used as the cumulative amount of the water consumption of the user, so that the water consumption of the user can be accurately metered under the circulating flowing running water state, the user can be metered to start charging only when the user really uses the water, and the problem of more charging or less charging is avoided. Meanwhile, the metering mode shown in fig. 1 is only to set a fluid meter on the water inlet pipe, and the influence of the water return pipe on the water flow flowing out of the water inlet pipe is not considered, so that the meter cannot accurately meter the water consumption of the user, namely the water output of the household branch pipe, and the structure of the embodiment avoids the problem, and the metering accuracy is improved by taking the flow difference value of the water inlet pipe and the water return pipe as the water accumulation amount for the user.

In one embodiment, in step 5), if the first error percentage is greater than the first set value, an alarm is issued to facilitate anomaly detection.

In one embodiment, in step 6), in order to prevent the false test, when the second error percentage is measured N times (for example, 2 times within 1 second) continuously, the difference between the measured intake water instantaneous flow and the measured return water instantaneous flow is used as the accumulated amount of the water consumption of the user.

In one embodiment, the first error percentage and the second error percentage are each 1% to 20%. Preferably, the first error percentage and the second error percentage are both 2% -5% to better ensure the metering accuracy.

In one embodiment, after step 2) and before step 3), the propagation speed of the ultrasonic wave in the water flow inside the water inlet metering pipe and the propagation speed of the ultrasonic wave in the water flow inside the water return metering pipe are corrected, and then the calculation of the water inlet instantaneous flow or the water return instantaneous flow in step 3) is performed;

the method for correcting the propagation speed of the ultrasonic wave in the water flow in the water inlet metering pipe comprises the following steps: acquiring the temperature of water flow in the water inlet metering pipe through a temperature sensor, and compensating and correcting the propagation speed of ultrasonic waves in the water flow in the water inlet metering pipe according to the acquired temperature of the water flow in the water inlet metering pipe;

the method for correcting the propagation speed of the ultrasonic wave in the water flow inside the return water metering pipe comprises the following steps: the temperature of water flow in the return water metering pipe is collected through a temperature sensor, and the propagation speed of ultrasonic waves in the water flow in the return water metering pipe is compensated and corrected according to the collected temperature of the water flow in the return water metering pipe.

The water flow temperature can influence the propagation velocity of the ultrasonic waves in the water flow, so that according to the water flow temperature value measured by the temperature sensor, the influence on the propagation velocity of the ultrasonic waves in the water flow, which is caused by temperature change, is compensated and corrected, the compensated propagation velocity can be closer to the actual propagation velocity, and the accuracy of flow calculation is further improved.

Further, after the instantaneous inflow and return water flows obtained in the step 3), the instantaneous inflow and return water flows are compensated and corrected, and then the step 4) is executed;

the method for compensating and correcting the calculated water inlet instantaneous flow comprises the following steps: calculating a Reynolds number according to the acquired temperature of the water flow in the water inlet metering pipe and the water inlet instantaneous flow, and compensating and correcting the water inlet instantaneous flow by using the Reynolds number;

the method for compensating and correcting the calculated return water instantaneous flow comprises the following steps: and calculating the Reynolds number according to the acquired temperature of the water flow in the return water metering pipe and the return water instantaneous flow, and compensating and correcting the return water instantaneous flow by using the Reynolds number.

The density and viscosity parameters of the water flow are also related to the water flow temperature, so that the influence of the density and viscosity parameters is compensated and corrected, and a corresponding compensation correction value, namely Reynolds number, is calculated according to the water flow temperature value to obtain flow data closer to the actual flow, so that the metering accuracy is improved.

Further, optimizing the compensated and corrected intake water instantaneous flow and return water instantaneous flow, and then executing the step 4);

the method for optimizing the compensated and corrected instantaneous water inlet flow comprises the following steps: adding the compensated and corrected instantaneous water inflow flow into a first data processing stack, acquiring N latest acquired flow data in the first data processing stack, removing the maximum value and the minimum value from the acquired N flow data to obtain N-2 flow data, then averaging the N-2 flow data, and multiplying the calculated average value by a weighting coefficient to obtain the optimal instantaneous water inflow flow;

the method for optimizing the compensated and corrected instantaneous flow of the backwater comprises the following steps: adding the compensated and corrected instantaneous backwater flow into a second data processing stack, acquiring N pieces of latest acquired flow data in the second data processing stack, removing the maximum value and the minimum value from the acquired N pieces of flow data to obtain N-2 pieces of flow data, then averaging the N-2 pieces of flow data, and multiplying the calculated average value by a weighting coefficient to obtain the optimal instantaneous backwater flow.

The maximum value and the minimum value in the N flow data can generate larger fluctuation influence on the overall average value, and the average value is taken after the maximum value and the minimum value are removed, so that the metering accuracy and stability can be better improved.

It can be understood that the data processing stack is a data storage space, and can accommodate at least N +1 data; each data represents a flow data. In the initial stage, when the data processing stack is not full of N data, the space without the number of data stored therein is defaulted to data 0.

In one embodiment, each ultrasonic transducer group comprises a first ultrasonic transducer and a second ultrasonic transducer, one for transmitting ultrasonic waves and the other for receiving ultrasonic waves;

the downstream propagation time is the time for the ultrasonic wave to propagate from the first ultrasonic transducer to the second ultrasonic transducer along the flow direction of the water flow in the water inlet metering pipe/the water return metering pipe; on the contrary, the reverse propagation time is the time for the ultrasonic wave to propagate from the second ultrasonic transducer to the first ultrasonic transducer along the reverse flow direction of the water flow in the water inlet metering pipe/the water return metering pipe.

Specifically, the method for acquiring the downstream propagation time and the upstream propagation time of the ultrasonic wave in the water flow inside the water inlet metering pipe by using the ultrasonic transducer group on the water inlet metering pipe comprises the following steps: controlling a first ultrasonic transducer in the ultrasonic transducer group to serve as a transmitting end to transmit ultrasonic waves, and enabling the ultrasonic waves to be transmitted along the flow direction of water flow in the water inlet metering pipe until the ultrasonic waves are received by a second ultrasonic transducer, wherein the time for transmitting the ultrasonic waves from the first ultrasonic transducer to the second ultrasonic transducer is the downstream transmission time of the ultrasonic waves in the water flow in the water inlet metering pipe; otherwise, controlling a second ultrasonic transducer in the ultrasonic transducer group to serve as a transmitting end to transmit ultrasonic waves, and enabling the ultrasonic waves to propagate along the reverse direction of the flowing of the water flow in the water inlet metering pipe until the ultrasonic waves are received by the first ultrasonic transducer, wherein the time for transmitting the ultrasonic waves from the second ultrasonic transducer to the first ultrasonic transducer is the reverse propagation time of the ultrasonic waves in the water flow in the water inlet metering pipe;

the method for acquiring the downstream propagation time and the upstream propagation time of the ultrasonic waves in the water flow in the return water measuring pipe by utilizing the ultrasonic transducer group on the return water measuring pipe comprises the following steps: controlling a first ultrasonic transducer in the ultrasonic transducer group to serve as a transmitting end to transmit ultrasonic waves, and enabling the ultrasonic waves to be transmitted along the flow direction of water flow in the backwater measuring pipe until the ultrasonic waves are received by a second ultrasonic transducer, wherein the time for the ultrasonic waves to be transmitted from the first ultrasonic transducer to the second ultrasonic transducer on the backwater measuring pipe is the downstream transmission time of the ultrasonic waves in the water flow in the backwater measuring pipe; and controlling a second ultrasonic transducer in the ultrasonic transducer group to serve as a transmitting end to transmit an ultrasonic signal, and enabling the ultrasonic signal to propagate along the reverse direction of the flowing of the water flow in the return water metering pipe until the ultrasonic signal is received by the first ultrasonic transducer, wherein the time for the ultrasonic signal to be transmitted from the second ultrasonic transducer on the return water metering pipe to the first ultrasonic transducer is the reverse propagation time of the ultrasonic wave in the water flow in the return water metering pipe.

In one embodiment, the ultrasonic emission of the ultrasonic transducer groups on the water inlet measuring pipe and the water return measuring pipe is controlled by the same controller, and the controller is arranged inside the fluid meter so as to improve the control precision.

In one embodiment, the controller is further connected to a display for displaying the water usage by the user.

In one embodiment, the controller is further provided with a communication module, and the communication module is used for transmitting the water consumption of the user to the remote management terminal.

Further, the communication module adopts a wired or wireless communication module.

In one embodiment, the remote management terminal is a meter reading device. The remote management terminal can also be a mobile terminal, such as a mobile phone.

According to the metering method for the water consumption of the user of the circulating water supply system, the fluid meter can measure the water flow-the water consumption of the user entering the household branch pipe in the process that the water in the pipeline maintains circulating flow, the length of a pipeline of a water pipe entering a household is shortened, the water quality sanitation standard of circulating water supply can be guaranteed, in addition, the water consumption of the user is calculated by using the flow difference value of the water inlet metering pipe and the water return metering pipe in a single meter, and the metering accuracy for the water consumption of the user is improved. In addition, for set up a fluid meter respectively on inlet tube and wet return, the above-mentioned metering mode of this embodiment has avoided using two strapping tables to measure the time and make final system metering error increase and lead to the lower problem of measurement accuracy because of different strapping table body differences, for example, if respectively set up a strapping table on inlet tube and the wet return, and commonly used strapping table has 2% of error (the national permitted scope), if the strapping table on the inlet tube has 2% of error, the strapping table on the corresponding wet return 4 has 2% of error. The two meters are arranged in the same system, so that the metering error of the system is 4%. The actual error is larger, and even the user can automatically accumulate the meter when no water is used in serious cases; if the error of the strapping table on the inlet tube is-2%, and the error of the metering pipe on the wet return is + 2%, then can lead to this system metering error to be-4%, cause the actual error to be on the small side, can lead to the problem that the unable measurement of user's low discharge water even when serious, and the single fluid meter of this application possesses into water metering pipe and return water metering pipe simultaneously, two metering pipes have better measurement uniformity, can effectively reduce the metering error of whole system, improve the measurement accuracy.

The metering method of the embodiment is mainly used for metering high-end water such as direct drinking water, purified water and the like, but is not limited to the metering of the fluid, and can also be used for metering other fluids needing precise metering.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.