CN114964600A

CN114964600A - Water flow pressure detection equipment of water meter

Info

Publication number: CN114964600A
Application number: CN202210529808.3A
Authority: CN
Inventors: 张婉情; 杨懿斌
Original assignee: Ningbo University of Technology
Current assignee: Ningbo University of Technology
Priority date: 2022-05-16
Filing date: 2022-05-16
Publication date: 2022-08-30

Abstract

The water meter water flow pressure detection device comprises an electromagnetic water valve, a storage battery, a water flow generator, a data acquisition mechanism, a data transmission circuit, a rectification circuit, a wireless receiving circuit, a wireless transmitting circuit and an alarm circuit; the water inlet pipe and the water outlet pipe of the water flow generator are connected in series between the water outlet pipe of the water meter and the water inlet pipe of the electromagnetic water valve; the data acquisition mechanism comprises a cylinder, a spring, a movable plate, a piston and a force-sensitive resistor, wherein the force-sensitive resistor, the movable plate, the spring and the piston are sequentially positioned in the cylinder; the storage battery, the data sending circuit, the rectifying circuit, the alarm circuit and the wireless receiving circuit are arranged in the element box and are electrically connected. The invention does not need to be installed by an external power line, can save electric energy, and relevant departments can master the water pressure of relevant areas in real time, thereby playing a technical support for making relevant measures, prompting a user when water is cut off, and opening and closing the water main valve in a wireless mode at any place in the house, thereby bringing convenience to the user.

Description

Water flow pressure detection equipment of water meter

Technical Field

The invention relates to the technical field of auxiliary water supply equipment, in particular to water meter water flow pressure detection equipment.

Background

The water meter is used as a water metering mechanism, and the main function of the water meter is to perform statistical metering on the total water consumption of a relevant area (such as a household). In the water supply system, a water supply unit needs to collect the water pressure of a relevant water using area, for example, a secondary booster water supply department in a residential community needs to know the water pressure of a high-rise resident, the base water pressure output of a booster pump is relatively adjusted to be high when the water pressure of the resident is insufficient, and the base water pressure output of the booster pump is relatively adjusted to be low when the water pressure of the resident is overhigh, so that the aim of saving energy can be fulfilled on the premise of meeting the safe water use of the high-rise resident.

Among the prior art, the mode of gathering high-rise resident water pressure, the personnel that generally are relevant of water supply department are through artificial mode, adopt check out test set to detect after the high-rise at the peak time quantum of water consumption, above-mentioned test mode has not only brought the inconvenience for the staff, increased data acquisition cost (generally the staff temporarily overlaps the pipeline of pressure collector at high-rise resident family tap water outlet end, open tap and carry out the reading to pressure collector, and then obtain water pressure data), and more crucial, artificial mode collection water pressure is not real-time going on, therefore the water pressure of gathering can not reflect the regional true water pressure of high-rise water supply, can cause certain adverse effect to safe water supply. In addition, the probability of pipe explosion or leakage of a water supply pipeline in a house exists in the current household water, so that water waste is caused when no person in the house closes a main valve in time, and the household or downstairs are flooded by water; therefore, the water valve can be prevented only by manually closing the main water valve by a resident, but the main water valve is generally positioned in a corner area (such as a toilet) in a home, and the water valve is inconvenient to close by the resident. In conclusion, it is necessary to provide a water pressure detection device which is used in cooperation with a water meter, can monitor water pressure in real time, and can conveniently close water supply.

Disclosure of Invention

In order to overcome the defects that the existing water meter only has a water consumption metering function due to structure limitation, cannot monitor water pressure in real time and cannot facilitate users to open and close a main water valve, the invention provides water meter combined use, in application, under the combined action of related mechanisms and circuits, water pressure data of a water using area can be monitored in real time, the water pressure data is transmitted remotely, related departments can master the water pressure data of the related area in real time through the existing mature Internet of things data receiving and transmitting technology, the users can be prompted actively when water is cut off, the users do not need to operate the main water valve, and the main water valve can be opened and closed conveniently in a wireless mode, so that convenient water meter water flow pressure detection equipment is provided for the users.

The technical scheme adopted by the invention for solving the technical problem is as follows:

the water meter water flow pressure detection device comprises an electromagnetic water valve, a storage battery and a water flow generator, and is characterized by also comprising a data acquisition mechanism, a data transmission circuit, a rectification circuit, a wireless receiving circuit, a wireless transmitting circuit and an alarm circuit; the water inlet pipe and the water outlet pipe of the water flow generator are connected in series between the water outlet pipe of the water meter and the water inlet pipe of the electromagnetic water valve, and the water outlet pipe of the electromagnetic water valve is connected with the water main pipeline; the data acquisition mechanism comprises a cylinder, a spring, a movable plate, a piston and a force-sensitive resistor, wherein the force-sensitive resistor is arranged at the upper end in the cylinder, the stress surface of the force-sensitive resistor faces the lower end, the movable plate, the spring and the piston are sequentially positioned in the cylinder, a sealing plate with an opening is arranged at the lower end of the cylinder, and the cylinder is arranged at the side end of a water inlet pipe of the water meter; the storage battery, the data sending circuit, the rectifying circuit, the alarm circuit and the wireless receiving circuit are arranged in the element box, and the wireless transmitting circuit is arranged indoors; the power output end of the wireless receiving circuit is electrically connected with the power input end of the electromagnetic water valve, and the signal output end of the force sensitive resistor is electrically connected with the signal input ends of the alarm circuit and the data sending circuit respectively.

Further, the electromagnetic water valve is a normally closed valve core electromagnetic water valve.

Further, the upper end of the movable plate is in contact with the lower end stress surface of the force-sensitive resistor.

Furthermore, the rectifier circuit comprises a rectifier bridge stack and a capacitor which are electrically connected, and a power output end of the rectifier bridge stack is respectively connected with two poles of the capacitor.

Furthermore, the data transmission circuit comprises a singlechip module and a GPRS module which are electrically connected, the two ends of the power input of the singlechip module and the two ends of the power input of the GPRS module are respectively connected, and the signal output end of the singlechip module is connected with the signal input end of the GPRS module.

Furthermore, the wireless receiving circuit comprises a wireless receiving circuit module, a resistor, an NPN triode and a relay which are electrically connected, wherein the positive power input end of the wireless receiving circuit module is connected with the positive power input end of the relay and the control power input end of the relay, one path of output end of the wireless receiving circuit module is connected with one end of the resistor, the other end of the resistor is connected with the base electrode of the NPN triode, the collector electrode of the NPN triode is connected with the negative power input end of the relay, and the negative power input end of the wireless receiving circuit module is connected with the emitter electrode of the NPN triode.

Furthermore, the alarm circuit comprises an NPN triode, a buzzer and a resistor which are electrically connected, one end of the first resistor is connected with the base of the first NPN triode, the collector of the first NPN triode is connected with one end of the second resistor and the base of the second NPN triode, the emitters of the two NPN triodes are connected, the collector of the second NPN triode is connected with the negative power input end of the buzzer, and the other end of the second resistor is connected with the positive power input end of the buzzer.

The invention has the beneficial effects that: the invention is used by combining with the water meter, and supplies power to the electric equipment at the water meter end in a power generation and storage mode of the water flow generator, so that the installation of an external power line is not needed, and the electric energy can be saved. When the water meter works, the data acquisition mechanism can monitor water pressure data at the water meter in real time, the water pressure data can be remotely transmitted through the wireless mobile network through the data transmission circuit in real time, and relevant departments can master the water pressure data of relevant areas in real time through the existing mature Internet of things data transceiving technology, such as a PC (personal computer) or a smart phone, so that beneficial technical support (such as pertinently improving or reducing the water pressure of relevant water supply) is provided for making relevant measures; under the action of an alarm circuit and the like, a user can be actively prompted when water is cut off, and when the user leaves home and the like and needs to close the main water valve, the main water valve can be opened and closed at any place in the home in a wireless mode, so that convenience is brought to the user. Based on the above, the invention has good application prospect.

Drawings

The invention is further illustrated below with reference to the figures and examples.

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural diagram of a data acquisition mechanism of the present invention.

Fig. 3 is a circuit diagram of the present invention.

Detailed Description

As shown in fig. 1, 2 and 3, the water flow pressure detection device of the water meter comprises an electromagnetic water valve DC, a storage battery G, a turbine water flow generator M, and further comprises a data acquisition mechanism, a data transmission circuit 1, a rectification circuit 2, a wireless receiving circuit 3, a wireless transmitting circuit a4 and an alarm circuit 4; the water inlet pipe of the turbine water flow generator M is connected with the water outlet pipe of the water meter 5 through a pipeline joint, the water outlet pipe of the turbine water flow generator M is connected with the water inlet pipe of the electromagnetic water valve DC through threads, and the water outlet pipe of the electromagnetic water valve DC is connected with the water main pipeline through a pipeline joint; the data acquisition mechanism comprises a cylindrical barrel 6 with a closed upper end and an open lower end, a spring 7, a movable plate 8, a piston 9 and a force-sensitive resistor RT, wherein the force-sensitive resistor RT is welded on a circuit board, the circuit board is adhered to the upper end in the barrel 6 with a stress surface facing to the lower end, the lower end of the spring 7 is adhered to the upper end of the piston 9 with glue, the upper end of the spring 7 is adhered to the lower end of a circular movable plate 8 with glue, the movable plate 8, the spring 7 and the piston 9 are sleeved in the barrel 6, the lower end of the barrel 6 is welded with a sealing plate 10 with an opening at the middle part, the lower end of the outer side of the barrel 6 is provided with an external thread, the barrel 6 is screwed into a screw hole at the middle part of the right side end of a water meter water inlet pipe 11 through the external thread to be hermetically installed at the side end of the water meter water inlet pipe 11, the lead connected with the force-sensitive resistor RT is led out from the upper end of the cylinder 6 through the hole at the upper end, and the hole is sealed by sealant; the storage battery G, the data sending circuit 1, the rectifying circuit 2, the alarm circuit 4 and the wireless receiving circuit 3 are installed on a circuit board in the element box 12, the element box 12 is installed on a wall surface near the water meter 5 and the like, and the wireless transmitting circuit A4 is installed at an indoor position (such as a wall surface on one indoor side of a home door) convenient to operate or placed at a position convenient to operate.

As shown in fig. 1, 2 and 3, the electromagnetic water valve DC is a normally closed valve core electromagnetic water valve with power of 2W and working voltage of direct current of 6V; the storage battery G is a lithium storage battery with the model number of 6V/10 Ah; turbine rivers generator M is the small-size alternating current generator of 6V, its output voltage is about 7V under the normal water condition, in order to do benefit to and charge for the 6V battery, turbine rivers generator M is inside to have turbine blade, the during operation inlet tube is intake, the outlet pipe goes out water, water flows in the outflow in-process, rivers can drive the blade and rotate, the blade drives the generator pivot rotation of turbine rivers generator housing back outside end, and then the generator sends alternating current power supply. The height of the spring 7 of the data acquisition mechanism is 5 mm higher than the inner diameter of the cylinder 6, the outer diameter of the rubber piston 9 is slightly larger than the inner diameter of the cylinder 1 mm, the outer diameter of the movable plate 8 is smaller than the inner diameter of the cylinder 6 by 1 mm, the upper end of the movable plate is in contact with the lower end stress surface of the force-sensitive resistor RT, and the inner diameter of the opening in the middle of the sealing plate 10 is smaller than the outer diameter of the piston 9. The rectifying circuit comprises a rectifying bridge stack A and a capacitor C1 which are connected through circuit board wiring, and

pins

3 and 4 of a power supply output end of the rectifying bridge stack A are respectively connected with two electrodes of a capacitor C1. The data transmission circuit comprises a singlechip module A1 and a GPRS module A2 which are connected through circuit board wiring, two

ends

1 and 2 of power input of the singlechip module A1 and the GPRS module A2 are respectively connected, and a signal output end of the singlechip module A1 is connected with a signal input end of the GPRS module A2 through an RS485 data line.

As shown in fig. 1, 2, and 3, the wireless receiving circuit includes a finished wireless receiving circuit module A3 of type TYO50-a72, a resistor R2, an NPN transistor Q1, and a relay K1 connected by circuit board wiring, a pin 1 of a positive power input terminal of the wireless receiving circuit module A3 is connected to a positive power input terminal and a control power input terminal of the relay K1, a pin 4 (

pins

2, 5, 6, and 7 are suspended) of one of output terminals of the wireless receiving circuit module A3 is connected to one end of a resistor R2, the other end of the resistor R2 is connected to a base of the NPN transistor Q1, a collector of the NPN transistor Q1 is connected to a negative power input terminal of the relay K1, and a pin 3 of a negative power input terminal of the wireless receiving circuit module A3 is connected to an emitter of the NPN transistor Q1; the wireless transmitting circuit A4 is a wireless transmitting circuit module finished product (installed in the shell together with a transmitting battery) with a model TYO50-A72, and is matched with a special 12V battery for the wireless transmitting circuit; the wireless signal transmission device is provided with four wireless signal transmission keys S1, S2, S3 and S4 (positioned outside four openings at the front end of a shell), and after the four keys are pressed respectively, the wireless transmission circuit module can respectively transmit four different wireless signals; the wireless transmitting circuit module A4 and the wireless receiving circuit module A3 are internally provided with coding circuits, and the mutual interference of the wireless signals transmitted and received by the same type wireless transmitting and wireless receiving circuit modules of different families living nearby can be prevented through different codes of the coding circuits. The alarm circuit comprises NPN triodes Q and Q2 and a buzzer B which are connected through a circuit board, resistors R1 and R3 and a power switch D2 (a handle is positioned outside a second opening at the front end of the element box), one end of the first resistor R1 is connected with the base of the first NPN triode Q1, the collector of the first NPN triode Q1 is connected with one end of the second resistor R3 and the base of the second NPN triode Q2, the emitters of the two NPN triodes Q and Q2 are connected, the collector of the second NPN triode Q2 is connected with the negative power input end of the buzzer B, the other end of the second resistor R3 is connected with one end of the power switch D2, and the other end of the power switch D2 is connected with the positive power input end of the buzzer B.

As shown in fig. 1, 2 and 3, two poles of a power supply of a turbine water flow generator M and two

ends

1 and 2 of a power supply input end of a rectifier bridge stack A are respectively connected through leads, two

poles

3 and 4 of a power supply output end of the rectifier bridge stack A and two poles of a storage battery G,

pins

1 and 2 of a power input end singlechip module A1 of the data sending circuit,

pins

1 and 3 of a power input end wireless receiving circuit module A3 of the wireless receiving circuit, the other end of a power input end resistor R3 of the alarm circuit, an emitting electrode of an NPN triode Q and one end of a force sensitive resistor RT (and the anode of a storage battery G) are respectively connected through leads, a normally open contact end of a power output end relay K1 of the wireless receiving circuit, the emitting electrode of the NPN triode Q1 and two ends of a power input of an electromagnetic water valve DC are respectively connected through leads, and the other end of the force sensitive resistor RT, the other end of a signal input end resistor R1 of the alarm circuit and the pin 3 of a signal input end singlechip module A1 of the data sending circuit are respectively connected through leads. The power input end and the power output end of a power switch D1 (the handle is positioned outside the first opening at the front end of the element box) are connected in series between the positive pole of the storage battery G and the positive power input ends of the data transmitting circuit, the wireless receiving circuit and the alarm circuit through leads.

As shown in fig. 1, 2 and 3, the water meter of the invention is used in combination with a water meter 5, and at ordinary times, a water flow generator M can generate electric energy to enter a power input end of a rectifier bridge stack a when tap water flows into and out of the water meter, the rectifier bridge stack a converts an input alternating current power supply into a direct current power supply, and then the direct current power supply is filtered by a capacitor C1 and then output to a storage battery G for storage, so that electric equipment near the water meter of the invention can be powered, and the installation is more convenient and the electric energy can be saved because an external power line is not needed. After the power switch D1 is turned on, the data transmitting circuit, the wireless receiving circuit, the alarm circuit and the force-sensitive resistor RT can be powered to work. When the pressure-sensitive type automatic pressure-reducing water-saving water dispenser works, water pressure in a tap water pipe acts on the piston 9, when the water pressure is higher, the upward distance of the piston 9 along the cylinder 6 against the elastic acting force of the spring 7 is larger, so that the spring is compressed to be relatively tightly close to the stress surface of the upper end of the movable plate 8 acting on the force-sensitive resistor RT, the pressure of the force-sensitive resistor RT is relatively large due to the relatively large stress of the stress surface, the resistance value of the force-sensitive resistor RT is relatively small, and at the moment, the voltage of a signal voltage of a pin 3 which enters the signal input end of the singlechip A1 after the 6V power supply is reduced and limited by the force-sensitive resistor RT is relatively high; the lower the water pressure is, the smaller the upward distance of the piston 9 along the cylinder 6 against the elastic acting force of the spring 7 is, so that the pressure of the stress surface acting on the force-sensitive resistor RT at the upper end of the relative loose plate 8 is relatively small due to the compression of the spring, the resistance value of the force-sensitive resistor RT is relatively large due to the relatively small stress of the stress surface, and the signal voltage of the pin 3 entering the signal input end of the singlechip A1 after the 6V power supply is subjected to voltage reduction and current limitation through the force-sensitive resistor RT is relatively low. When the signal voltage entering the single chip module a1 changes with the water pressure, the single chip module a1 converts the dynamically changing analog voltage signal into a digital signal under the action of its internal circuit and outputs the digital signal to the signal input terminal of the GPRS module a2, then the GPRS module a2 remotely transmits the data through the wireless mobile network, and after the data is received by the PC or the smart phone of the remote water supply department, the relevant manager can timely master the corresponding water pressure data on site (the remote manager receives and displays the data through the application of the PC or the smart phone, and the GPRS modules in different areas have SIM cards with different numbers, so the receiving terminal can know the specific position according to the number corresponding to the received data).

Referring to fig. 1, 2 and 3, in the present invention, when the tap water is not cut off, the resistance of the force sensitive resistor RT is relatively low, the current is limited by the resistor R1, the voltage dropped into the base of the NPN triode Q is relatively high (higher than 0.7V), then the NPN triode Q will turn on the collector to output a low level to enter the base of the NPN triode Q2, the base of the NPN triode Q2 is not properly biased forward and is cut off, and the buzzer B will not sound to represent that the tap water is not cut off. When tap water stops, the resistance of the force-sensitive resistor RT is relatively high, the current is limited by the resistor R1, the voltage is reduced, the voltage entering the base electrode of the NPN triode Q is relatively low (lower than 0.7V), then the NPN triode Q can cut off the collector electrode of the NPN triode Q and does not output low level to enter the base electrode of the NPN triode Q2, the base electrode of the NPN triode Q2 is subjected to voltage reduction and current limitation by the resistor R3 to obtain proper forward bias conduction, the collector electrode of the NPN triode Q outputs low level to enter the negative power supply input end of the buzzer B, and then the buzzer B can generate electric sound to represent water stop (a user can visually know that water stop after hearing the sound, can close the power switch D2 after hearing the sound, and open the power switch D2 after next water coming). In the invention, a user can close the main water valve in a wireless mode before going out of a door and the like, after a first signal transmitting key S1 of a wireless transmitting circuit module A4 is pressed, a wireless transmitting circuit A4 can transmit a first path of closed wireless signals, 4 feet of a wireless receiving circuit module A3 can output high level after receiving the first path of wireless closed signals, the high level enters a base electrode of an NPN triode Q1 after being subjected to voltage reduction and current limitation by a resistor R2, the NPN triode Q1 is conducted with a collector to output low level and enters a negative power input end of a relay K1, the relay K1 is electrified to attract the control power input end and a normally open contact end of the relay to be closed, further, the electromagnetic water valve DC is electrified to work, and an inner valve core of the electromagnetic water valve is closed, so tap water at a water meter can stop being output. When the user need supply water, press the second signal transmission button S2 of wireless transmitting circuit module A4 after, wireless transmitting circuit A4 can launch the wireless signal of opening a way all the way, its 4 feet can stop exporting the high level behind the wireless receiving circuit module A3 received the wireless signal of opening a way all the way, and then, relay K1 loses the electricity and no longer attracts its control power input of actuation and normally open contact end to open a way, and then electromagnetism water valve DC loses the electricity and no longer works its inside case and opens, the running water of water gauge department will export once more like this. Through the combined action of all the circuits and mechanisms, the water pressure control system does not need to be installed by an external power line, can save electric energy, and relevant departments can master water pressure data of relevant areas in real time through a PC (personal computer) or a smart phone and the like through the data receiving and sending technology of the Internet of things, so that the water pressure control system plays a favorable technical support for making relevant measures (such as pertinently improving or reducing the water pressure of relevant water supply); under the action of an alarm circuit and the like, a user can be actively prompted when water is cut off, and when the user leaves home and the like and needs to close the main water valve, the main water valve can be opened and closed at any place in the home in a wireless mode, so that convenience is brought to the user. In fig. 3, resistances R1, R3, R2 are 470K, 100K, 1K, respectively; relay K1 is a DC12V relay; GPRS model a2 model ZLAN 8100; the model of a main control chip of the singlechip module A1 is STC12C5A60S 2; model numbers of NPN triode Q, Q2 and Q1 are 9014, 9013 and 9013 respectively; the force sensitive resistor RT is a resistance type thin film pressure sensor of model FSR 402; in this example, the larger the value of the resistor R1 is, the smaller the resistance value of the force sensitive resistor RT having a certain water pressure (relatively large), the higher the base voltage of the NPN transistor Q is to be higher than 0.7V; the smaller the value of the resistor R1 is, the higher the resistance value of the relatively low water pressure sensitive resistor RT is, the higher the base voltage of the transistor Q which enters the NPN transistor is higher than 0.7V (the value of 470K in the embodiment); the model of the rectifier bridge stack A is KP 301; the buzzer B is an active continuous sound buzzer alarm finished product with the model FM 6V; the capacitance C1 is model 470 μ F/25V (filter effect).

While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, the embodiments do not include only one independent technical solution, and such description is only for clarity, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. The water meter water flow pressure detection device comprises an electromagnetic water valve, a storage battery and a water flow generator, and is characterized by also comprising a data acquisition mechanism, a data transmission circuit, a rectification circuit, a wireless receiving circuit, a wireless transmitting circuit and an alarm circuit; the water inlet pipe and the water outlet pipe of the water flow generator are connected in series between the water outlet pipe of the water meter and the water inlet pipe of the electromagnetic water valve, and the water outlet pipe of the electromagnetic water valve is connected with the water main pipeline; the data acquisition mechanism comprises a cylinder, a spring, a movable plate, a piston and a force-sensitive resistor, wherein the force-sensitive resistor is arranged at the upper end in the cylinder, the stress surface of the force-sensitive resistor faces the lower end, the movable plate, the spring and the piston are sequentially positioned in the cylinder, a sealing plate with an opening is arranged at the lower end of the cylinder, and the cylinder is arranged at the side end of a water inlet pipe of the water meter; the storage battery, the data sending circuit, the rectifying circuit, the alarm circuit and the wireless receiving circuit are arranged in the element box, and the wireless transmitting circuit is arranged indoors; the power output end of the wireless receiving circuit is electrically connected with the power input end of the electromagnetic water valve, and the force-sensitive resistor is electrically connected with the signal input ends of the alarm circuit and the data sending circuit respectively.

2. A water meter water flow pressure sensing apparatus as recited in claim 1, wherein the solenoid water valve is a normally closed spool solenoid water valve.

3. A water meter flow pressure sensing apparatus as defined in claim 1, wherein the upper end of the movable plate is in contact with the lower force-bearing surface of the force sensitive resistor.

4. The water meter water flow pressure sensing device of claim 1, wherein the rectifying circuit comprises a bridge rectifier and a capacitor electrically connected to each other, and the power output of the bridge rectifier is connected to both poles of the capacitor.

5. The water meter water flow pressure detecting device of claim 1, wherein the data transmitting circuit comprises a single chip microcomputer module and a GPRS module electrically connected to each other, power input ends of the single chip microcomputer module and the GPRS module are respectively connected to each other, and a signal output end of the single chip microcomputer module is connected to a signal input end of the GPRS module.

6. The water meter water flow pressure detecting device of claim 1, wherein the wireless receiving circuit includes a wireless receiving circuit module, a resistor, an NPN transistor, and a relay, the wireless receiving circuit module having a positive power input connected to the positive power input of the relay and a control power input, the wireless receiving circuit module having one of its output terminals connected to one end of the resistor, the other end of the resistor connected to a base of the NPN transistor, a collector of the NPN transistor connected to a negative power input of the relay, and a negative power input connected to an emitter of the NPN transistor.

7. A water meter water flow pressure detecting device according to claim 1, wherein the alarm circuit includes an NPN transistor and a buzzer electrically connected to each other, and a resistor, one end of the first resistor is connected to a base of the first NPN transistor, a collector of the first NPN transistor is connected to one end of the second resistor, a base of the second NPN transistor, emitters of the two NPN transistors are connected, a collector of the second NPN transistor is connected to a negative power input terminal of the buzzer, and the other end of the second resistor is connected to a positive power input terminal of the buzzer.