Ultrasonic fluid flow measuring instrument

Abstract

The utility model discloses an ultrasonic fluid flow measuring instrument, and belongs to the field of fluid measurement. The ultrasonic fluid flow measuring instrument comprises a battery, a main circuit module, a switch module, a transducer and a measuring tube, the transducer is arranged on the measuring tube and is electrically connected with the main circuit module, and the main circuit module comprises a circuit unit capable of supplying power interruptedly; the power interface is electrically connected with the switch module and used for being connected with an external power source, the battery is electrically connected with the switch module, and the switch module is electrically connected with the circuit unit capable of supplying power interruptedly. Under the condition that the power interface is not connected with an external power supply, the battery supplies power to the circuit unit capable of interruptedly supplying power; and under the condition that the power interface is connected with an external power supply, the external power supply supplies power to the circuit unit capable of interruptedly supplying power through the switch module.

Description

Technical Field

[0001] This application belongs to the field of fluid measurement, and particularly relates to an ultrasonic fluid flow measurement instrument. Background Art

[0002] With the development of technology, the application of ultrasonic fluid flow measurement instruments has become increasingly widespread. Through ultrasonic fluid flow measurement instruments, the flow rate of fluids can be measured relatively accurately. With the industrial development of ultrasonic fluid flow measurement instruments, various tests need to be carried out on ultrasonic fluid flow measurement instruments. However, the ultrasonic fluid flow measurement instruments in related technologies are difficult to conduct various necessary tests related to ultrasonic characteristics. Summary of the Utility Model

[0003] The purpose of the embodiments of this application is to provide an ultrasonic fluid flow measurement instrument, which at least solves the problem that ultrasonic fluid flow measurement instruments are not convenient for conducting various tests.

[0004] In a first aspect, the embodiments of this application provide an ultrasonic fluid flow measurement instrument, which includes: a battery, a main circuit module, a switch module, a transducer, a measuring tube, and a power interface;

[0005] The transducer is disposed on the measuring tube, and the transducer is electrically connected to the main circuit module. The main circuit module includes a circuit unit that can supply power intermittently;

[0006] The power interface is electrically connected to the switch module. The power interface is used to connect to an external power source. The battery is electrically connected to the switch module, and the switch module is electrically connected to the circuit unit that can supply power intermittently;

[0007] When the external power source is not connected to the power interface, the battery supplies power to the circuit unit that can supply power intermittently; when the external power source is connected to the power interface, the external power source supplies power to the circuit unit that can supply power intermittently through the switch module.

[0008] Optionally, the switch module includes a first power supply branch and a second power supply branch;

[0009] One end of the first power supply branch is connected to the power interface, one end of the second power supply branch is electrically connected to the battery. The other end of the first power supply branch is electrically connected to the circuit unit that can supply power intermittently. The first power supply branch and the circuit unit that can supply power intermittently can be conducted. The other end of the second power supply branch is connected to the circuit unit that can supply power intermittently, and the second power supply branch and the circuit unit that can supply power intermittently can be conducted;

[0010] When the external power supply is not connected to the power interface, the first power supply branch is not conductive between the discontinuous power supply circuit unit, and the second power supply branch is conductive between the discontinuous power supply circuit unit. The battery supplies power to the discontinuous power supply circuit unit through the second power supply branch. When the external power supply is connected to the power interface, the first power supply branch is conductive between the discontinuous power supply circuit unit, and the second power supply branch is not conductive between the discontinuous power supply circuit unit. The external power supply supplies power to the discontinuous power supply circuit unit through the first power supply branch.

[0011] Optionally, the total circuit module further includes a circuit unit that requires continuous power supply;

[0012] The battery is electrically connected to the circuit unit that requires continuous power supply, and the battery supplies power to the circuit unit that requires continuous power supply.

[0013] Optionally, the total circuit module further includes a circuit unit that requires continuous power supply;

[0014] The power input terminal of the circuit unit that requires continuous power supply is electrically connected to the power input terminal of the discontinuous power supply circuit unit;

[0015] The other end of the first power supply branch is also electrically connected to the circuit unit that requires continuous power supply. The first power supply branch can be conductive between the circuit unit that requires continuous power supply, and the second power supply branch can be conductive between the circuit unit that requires continuous power supply;

[0016] When the external power supply is not connected to the power interface, the first power supply branch is not conductive between the circuit unit that requires continuous power supply, and the second power supply branch is conductive between the circuit unit that requires continuous power supply. The battery supplies power to the circuit unit that requires continuous power supply through the second power supply branch. When the external power supply is connected to the power interface, the first power supply branch is conductive between the circuit unit that requires continuous power supply, and the second power supply branch is not conductive between the circuit unit that requires continuous power supply. The external power supply supplies power to the circuit unit that requires continuous power supply through the first power supply branch.

[0017] Optionally, the first power supply branch includes a first control switch, and the second power supply branch includes a second control switch;

[0018] The first end of the first control switch is electrically connected to the power interface, the first end of the second control switch is electrically connected to the battery, the second ends of the first control switch and the second control switch are electrically connected, and the second end of the first control switch is electrically connected to the discontinuous power supply circuit unit;

[0019] When the external power supply is not connected to the power interface, the first control switch is not turned on, and the second control switch is turned on, so that the second power supply branch is connected to the intermittently power - supplyable circuit unit, and the battery supplies power to the intermittently power - supplyable circuit unit through the second control switch; when the external power supply is connected to the power interface, the first control switch is turned on, and the second control switch is not turned on, so that the second power supply branch is not connected to the intermittently power - supplyable circuit unit, and the external power supply supplies power to the intermittently power - supplyable circuit unit through the first control switch.

[0020] Optionally, the first power supply branch includes a first control switch, and the second power supply branch includes a second control switch;

[0021] The first end of the first control switch is electrically connected to the power interface, the first end of the second control switch is electrically connected to the battery, the second ends of the first control switch and the second control switch are electrically connected, and the second end of the first control switch is electrically connected to the intermittently power - supplyable circuit unit, and the battery is electrically connected to the continuously power - supplyable circuit unit;

[0022] When the external power supply is not connected to the power interface, the first control switch is not turned on, and the second control switch is turned on, so that the second power supply branch is connected to the intermittently power - supplyable circuit unit, the battery supplies power to the intermittently power - supplyable circuit unit through the second control switch, and the battery supplies power to the continuously power - supplyable circuit unit; when the external power supply is connected to the power interface, the first control switch is turned on, and the second control switch is not turned on, so that the second power supply branch is not connected to the intermittently power - supplyable circuit unit, the external power supply supplies power to the intermittently power - supplyable circuit unit through the first control switch, and the battery supplies power to the continuously power - supplyable circuit unit.

[0023] Optionally, the ultrasonic fluid flow measuring instrument further includes a control module;

[0024] The control module is electrically connected to the first control switch and the second control switch respectively, and the control module is used to control the first control switch and the second control switch so that both the first control switch and the second control switch can switch between the on - state and the off - state.

[0025] Optionally, the first control switch is a diode, the second control switch is a MOS transistor, and the control module includes a first resistor and a buffer;

[0026] The second end of the first resistor is grounded, and the first end of the first resistor is electrically connected to the power supply interface, the buffer, and the diode;

[0027] The first end of the buffer is electrically connected to the power supply interface, the diode, and the first resistor respectively; the second end of the buffer is electrically connected to the MOS transistor.

[0028] Optionally, both the first control switch and the second control switch are MOS transistors, and the control module includes a second resistor, a third resistor, an inverter, and a buffer;

[0029] The output end of the inverter is electrically connected to the MOS transistor corresponding to the first control switch, the input end of the inverter is electrically connected to the input end of the buffer, and the output end of the buffer is electrically connected to the MOS transistor corresponding to the second control switch;

[0030] The first end of the second resistor is electrically connected to the MOS transistor corresponding to the first control switch and is electrically connected to the power supply interface, the second end of the second resistor is electrically connected to the first end of the third resistor, the second end of the third resistor is grounded, and the connection where the input end of the inverter is electrically connected to the input end of the buffer is electrically connected to the second end of the second resistor.

[0031] Optionally, the ultrasonic fluid flow measuring instrument further includes a first capacitor, the first end of the first capacitor is electrically connected to the electrical connection point between the battery and the circuit unit that needs to be continuously powered, and the second end of the first capacitor is grounded.

[0032] Optionally, the ultrasonic fluid flow measuring instrument further includes a second capacitor, the first end of the second capacitor is electrically connected to the second end of the second control switch, and the second end of the second capacitor is grounded.

[0033] Optionally, the ultrasonic fluid flow measuring instrument further includes a third capacitor, the first end of the third capacitor is electrically connected to the second end of the second control switch, and the second end of the third capacitor is grounded.

[0034] Optionally, the ultrasonic fluid flow measuring instrument further includes a fourth capacitor, the first end of the fourth capacitor is electrically connected to the intermittently powerable circuit unit, and the first end of the fourth capacitor is electrically connected to the second end of the second control switch, the second end of the fourth capacitor is grounded, and the fourth capacitor is in parallel with the third capacitor.

[0035] Optionally, the ultrasonic fluid flow measuring instrument further includes a plug-in structure provided with a plug-in hole. The first power supply branch includes a first terminal, and the second power supply branch includes a second terminal. Both the first terminal and the second terminal are disposed in the plug-in hole. A reed is also disposed in the plug-in hole, and the plug-in hole forms the power interface;

[0036] The first terminal and the second terminal are spaced apart. One end of the reed is connected to the first terminal, and the other end of the reed is movable relative to the plug-in hole and can be switched between a first position and a second position. The battery is electrically connected to the second terminal, the first terminal is electrically connected to the intermittently powerable circuit unit, and the battery is electrically connected to the circuit unit that needs to be continuously powered;

[0037] When the external power supply is not connected to the power interface, the other end of the reed is located at the first position and contacts the second terminal, and the first terminal and the second terminal are electrically connected, so that the second power supply branch and the intermittently powerable circuit unit are electrically connected. The battery supplies power to the intermittently powerable circuit unit through the reed, the first terminal and the second terminal, and the battery directly supplies power to the circuit unit that needs to be continuously powered. When the external power supply is connected to the power interface, the external power supply abuts against the reed, the other end of the reed is located at the second position and is separated from the second terminal, and the first terminal and the second terminal are not electrically connected, so that the second power supply branch and the intermittently powerable circuit unit are not electrically connected. The external power supply is electrically connected to the first terminal through the reed to form a conductive first power supply branch, and the external power supply supplies power to the intermittently powerable circuit unit through the reed and the first terminal, and the battery directly supplies power to the circuit unit that needs to be continuously powered.

[0038] Optionally, the ultrasonic fluid flow measuring instrument further includes a fifth capacitor;

[0039] The first end of the fifth capacitor is electrically connected to the first terminal, and the second end of the fifth capacitor is grounded.

[0040] Optionally, the ultrasonic fluid flow measuring instrument further includes a sixth capacitor;

[0041] The first end of the sixth capacitor is electrically connected to the battery, and the second end of the sixth capacitor is grounded.

[0042] Optionally, the ultrasonic fluid flowmeter further includes a plug-in structure provided with a plug-in hole. The first power supply branch includes a first terminal, and the second power supply branch includes a second terminal. Both the first terminal and the second terminal are disposed in the plug-in hole, and a reed is also disposed in the plug-in hole. The plug-in hole forms the power interface;

[0043] The first terminal and the second terminal are spaced apart. One end of the reed is connected to the first terminal, and the other end of the reed is movable relative to the plug-in hole and can be switched between a first position and a second position. The battery is electrically connected to the second terminal, and the first terminal is electrically connected to the intermittently powerable circuit unit;

[0044] When the external power supply is not connected to the power interface, the other end of the reed is located at the first position, and the other end of the reed contacts the second terminal, so that the first terminal and the second terminal are electrically connected, enabling the second power supply branch and the intermittently powerable circuit unit to be electrically connected. The battery supplies power to the intermittently powerable circuit unit through the reed, the first terminal, and the second terminal; when the external power supply is connected to the power interface, the external power supply abuts against the reed, the other end of the reed is located at the second position, and the other end of the reed is separated from the second terminal, so that the first terminal and the second terminal are not electrically connected, enabling the second power supply branch and the intermittently powerable circuit unit to be not electrically connected. The external power supply supplies power to the intermittently powerable circuit unit through the reed and the first terminal.

[0045] Optionally, the ultrasonic fluid flowmeter further includes a seventh capacitor;

[0046] The first end of the seventh capacitor is electrically connected to the battery, and the second end of the seventh capacitor is grounded.

[0047] Optionally, the ultrasonic fluid flowmeter further includes an eighth capacitor;

[0048] The first end of the eighth capacitor is electrically connected to the intermittently powerable circuit unit and the first terminal, and the second end of the eighth capacitor is grounded.

[0049] Optionally, the ultrasonic fluid flowmeter further includes a housing and a circuit board;

[0050] The battery, the total circuit module, the switch module, the transducer, the measuring tube, and the circuit board are all disposed in the housing, and the total circuit module and the switch module are integrated on the circuit board. The power interface is disposed on the housing or the circuit board.

[0051] In the embodiment of the present application, since the transducer is disposed in the measuring tube and the transducer is electrically connected to the total circuit module, the transducer can transmit and receive ultrasonic waves at regular intervals under the control of the total circuit module. When the fluid in the measuring tube flows, the total circuit module can calculate the time difference of the ultrasonic flight times in the downstream and upstream directions based on the measurement of the ultrasonic wave transmission and reception events of the transducer, and then determine the flow velocity and flow rate of the fluid in the measuring tube by using the specifications of the measuring tube and the transducer and the type of the fluid. Since the power interface is electrically connected to the switch module, the battery is electrically connected to the switch module, and the switch module is electrically connected to the intermittently power-supplied circuit unit, when various tests need to be performed on the ultrasonic fluid flowmeter, an external power source can be connected to the power interface, so that the external power source supplies power to the intermittently power-supplied circuit unit through the switch module, enabling the power supply of the intermittently power-supplied circuit unit to change with the power output of the external power source, thereby enabling various tests to be performed on the ultrasonic fluid flowmeter. When no external power source is connected to the power interface, the battery supplies power to the intermittently power-supplied circuit unit, enabling the ultrasonic fluid flowmeter to operate normally. That is, in the embodiment of the present application, the power interface is electrically connected to the switch module, the battery is electrically connected to the switch module, and the switch module is electrically connected to the intermittently power-supplied circuit unit, so that when tests need to be performed on the ultrasonic fluid flowmeter, an external power source can be connected to the power interface, enabling the external power source to provide power with different characteristics to the intermittently power-supplied circuit unit through the switch module for testing the ultrasonic fluid flowmeter. When no tests are required, the battery supplies power to the intermittently power-supplied circuit unit. That is, in the embodiment of the present application, the power supply characteristics of the intermittently power-supplied circuit unit can be effectively changed to realize various tests on the ultrasonic fluid flowmeter. Description of the Drawings

[0052] Figure 1 One of the schematic diagrams showing an ultrasonic fluid flowmeter provided by an embodiment of the present application;

[0053] Figure 2 Another schematic diagram showing an ultrasonic fluid flowmeter provided by an embodiment of the present application;

[0054] Figure 3 One of the schematic diagrams showing an ultrasonic fluid flowmeter provided by an embodiment of the present application;

[0055] Figure 4 One of the schematic diagrams showing an ultrasonic fluid flowmeter provided by an embodiment of the present application;

[0056] Figure 5 One of the schematic diagrams showing an ultrasonic fluid flowmeter provided by an embodiment of the present application;

[0057] Figure 6 Figure VI of the schematic diagram showing an ultrasonic fluid flow measuring instrument provided by an embodiment of the present application;

[0058] Figure 7 Figure VII of the schematic diagram showing an ultrasonic fluid flow measuring instrument provided by an embodiment of the present application;

[0059] Figure 8 Figure VIII of the schematic diagram showing an ultrasonic fluid flow measuring instrument provided by an embodiment of the present application;

[0060] Figure 9 Figure IX of the schematic diagram showing an ultrasonic fluid flow measuring instrument provided by an embodiment of the present application;

[0061] Figure 10 Figure X of the schematic diagram showing an ultrasonic fluid flow measuring instrument provided by an embodiment of the present application.

[0062] Reference numerals:

[0063] 10: housing; 101: power supply interface; 20: battery; 30: main circuit module; 31: intermittently power - supplyable circuit unit; 32: continuously power - supply - required circuit unit; 40: switch module; 41: first power - supply branch; 42: second power - supply branch; 411: first control switch; 412: first terminal; 421: second control switch; 422: second terminal; 50: transducer; 60: measuring tube; 70: control module; 71: first resistor; 72: buffer; 73: second resistor; 74: third resistor; 75: inverter; 001: first capacitor; 002: second capacitor; 003: third capacitor; 004: fourth capacitor; 005: fifth capacitor; 006: sixth capacitor; 007: seventh capacitor; 008: eighth capacitor; 100: insertion hole; 110: reed; 200: external power supply. Detailed implementation manners

[0064] The terms "first" and "second" in the description and claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, "a plurality of" means two or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0065] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0066] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0067] As Figures 1 to 10 shown, the ultrasonic fluid flow measuring instrument includes: a battery 20, a main circuit module 30, a switch module 40, a transducer 50, a measuring tube 60, and a power interface 101.

[0068] The transducer 50 is arranged on the measuring tube 60, and the transducer 50 is electrically connected to the main circuit module 30. The main circuit module 30 includes a circuit unit 31 that can supply power intermittently; the power interface 101 is electrically connected to the switch module 40. The power interface 101 is used to connect to an external power supply 200. The battery 20 is electrically connected to the switch module 40. The switch module 40 is electrically connected to the circuit unit 31 that can supply power intermittently; when the power interface 101 is not connected to the external power supply 200, the battery 20 supplies power to the circuit unit 31 that can supply power intermittently; when the power interface 101 is connected to the external power supply 200, the external power supply 200 supplies power to the circuit unit 31 that can supply power intermittently through the switch module 40.

[0069] In the embodiment of the present application, since the transducer 50 is disposed in the measuring tube 60 and the transducer 50 is electrically connected to the total circuit module 30, the transducer 50 can periodically transmit and receive ultrasonic waves under the control of the total circuit module 30. When the fluid in the measuring tube 60 flows, the total circuit module 30 can calculate the time difference of the ultrasonic transit times in the downstream and upstream directions based on the measurement of the ultrasonic wave transmission and reception events of the transducer 50, and then determine the flow velocity and flow rate of the fluid in the measuring tube 60 by using the specifications of the measuring tube 60 and the transducer 50 and the type of the fluid. Since the power supply interface 101 is electrically connected to the switch module 40, the battery 20 is electrically connected to the switch module 40, and the switch module 40 is electrically connected to the intermittently power - supplyable circuit unit 31, when various tests need to be performed on the ultrasonic fluid flow measuring instrument, an external power supply 200 can be connected to the power supply interface 101. Thus, the external power supply 200 supplies power to the intermittently power - supplyable circuit unit 31 through the switch module 40, so that the power supply of the intermittently power - supplyable circuit unit 31 can change with the power output of the external power supply 200, and various tests can be performed on the ultrasonic fluid flow measuring instrument. When the external power supply 200 is not connected to the power supply interface 101, the battery 20 supplies power to the intermittently power - supplyable circuit unit 31, enabling the ultrasonic fluid flow measuring instrument to operate normally. That is, in the embodiment of the present application, the power supply interface 101 is electrically connected to the switch module 40, the battery 20 is electrically connected to the switch module 40, and the switch module 40 is electrically connected to the intermittently power - supplyable circuit unit 31. Thus, when tests need to be performed on the ultrasonic fluid flow measuring instrument, an external power supply 200 can be connected to the power supply interface 101, so that the external power supply 200 supplies power with different characteristics to the intermittently power - supplyable circuit unit 31 through the switch module 40 for testing the ultrasonic fluid flow measuring instrument. When testing is not required, the battery 20 supplies power to the intermittently power - supplyable circuit unit 31. That is, in the embodiment of the present application, the power - supply characteristics of the intermittently power - supplyable circuit unit 31 can be effectively changed to realize various tests on the ultrasonic fluid flow measuring instrument.

[0070] Among them, the power - supply characteristics include but are not limited to the power - supply voltage amplitude, power supply noise, voltage ripple, etc.

[0071] It should be noted that in the embodiment of the present application, the tests performed on the ultrasonic fluid flow measuring instrument include but are not limited to durability tests, wear - resistance tests, power - supply noise reliability tests, etc. Among them, when performing the wear - resistance test on the ultrasonic fluid flow measuring instrument, the external power supply 200 is connected to the power supply interface 101 to reduce the consumption of the battery 20, so as to ensure that the ultrasonic fluid flow measuring instrument can still be used and sold normally after the wear - resistance test. At this time, the external power supply 200 can supply power to the intermittently power - supplyable circuit unit 31. The specific test can be as follows:

[0072] (a) Wear resistance test at maximum operating voltage: Adjust the output voltage of the external power supply 200 to the maximum operating voltage Vmax of the ultrasonic fluid flow measuring instrument, and then conduct a durability test in accordance with the durability test requirements of the ultrasonic fluid flow measuring instrument. Observe whether the ultrasonic fluid flow measuring instrument can meet the metering accuracy requirements at different flow rates and flow velocities. (b) Wear resistance test at typical operating voltage: Adjust the output voltage of the external power supply 200 to the typical operating voltage Vtyp of the ultrasonic fluid flow measuring instrument, and then conduct a durability test in accordance with the durability test requirements of the ultrasonic fluid flow measuring instrument. Observe whether the ultrasonic fluid flow measuring instrument can meet the metering accuracy requirements at different flow rates and flow velocities. (c) Wear resistance test at minimum operating voltage: Adjust the output voltage of the external power supply 200 to the minimum operating voltage Vmin of the ultrasonic fluid flow measuring instrument, and then conduct a durability test in accordance with the durability test requirements of the ultrasonic fluid flow measuring instrument. Observe whether the ultrasonic fluid flow measuring instrument can meet the metering accuracy requirements at different flow rates and flow velocities.

[0073] When conducting the power supply noise reliability test on the ultrasonic fluid flow measuring instrument, connect the external power supply 200 to the power supply interface 101. At this time, the external power supply 200 can supply power to the intermittently powerable circuit unit 31. The specific test can be as follows:

[0074] (d) Power supply noise test at maximum operating voltage: Adjust the output voltage of the external power supply 200 to the maximum operating voltage Vmax of the device, and at the same time, utilize the programmable characteristics of the programmable external power supply 200 to add power supply noise of corresponding amplitude and type to its power output according to the test requirements, such as a 50 mV sine wave voltage noise at 50 Hz. Then observe whether the ultrasonic fluid flow measuring instrument can meet the metering accuracy requirements at different flow rates and flow velocities. (e) Power supply noise test at typical operating voltage: Adjust the output voltage of the external power supply 200 to the typical operating voltage Vtyp of the device, and at the same time, utilize the programmable characteristics of the programmable external power supply 200 to add power supply noise of corresponding amplitude and type to its power output according to the test requirements, such as a 50 mV sine wave voltage noise at 50 Hz. Then observe whether the ultrasonic fluid flow measuring instrument can meet the metering accuracy requirements at different flow rates and flow velocities. (f) Power supply noise test at minimum operating voltage: Adjust the output voltage of the external power supply 200 to the minimum operating voltage Vmin of the device, and at the same time, utilize the programmable characteristics of the programmable external power supply 200 to add power supply noise of corresponding amplitude and type to its power output according to the test requirements, such as a 50 mV sine wave voltage noise at 50 Hz. Then observe whether the ultrasonic fluid flow measuring instrument can meet the metering accuracy requirements at different flow rates and flow velocities.

[0075] It should be noted that in the embodiments of the present application, the external power supply 200 outputs a DC power supply.

[0076] In addition, in the related art, an ultrasonic fluid flow measurement instrument includes a battery 20 and a circuit unit 31 that can be intermittently powered. The battery 20 is electrically connected to the circuit unit 31 that can be intermittently powered, so that the battery 20 powers the circuit unit 31 that can be intermittently powered. However, the voltage provided by the battery 20 to the circuit unit 31 that can be intermittently powered is non-adjustable. When it is necessary to measure the ultrasonic fluid flow measurement instrument, the non-adjustable voltage on the circuit unit 31 that can be intermittently powered is not conducive to measurement. In the embodiments of the present application, the power interface 101 is electrically connected to the switch module 40, the battery 20 is electrically connected to the switch module 40, and the switch module 40 is electrically connected to the circuit unit 31 that can be intermittently powered. Therefore, when it is necessary to test the ultrasonic fluid flow measurement instrument, an external power supply 200 can be connected through the power interface 101, so that the external power supply 200 provides power with different voltages and characteristics to the circuit unit 31 that can be intermittently powered through the switch module 40, so as to test the ultrasonic fluid flow measurement instrument, and the test of the ultrasonic fluid flow measurement instrument is more comprehensive and accurate.

[0077] In addition, in the embodiments of the present application, the number of transducers 50 can be set according to actual needs. For example, when the number of transducers 50 is two, at this time, both transducers 50 are arranged on the measuring pipe 60. When one transducer 50 is used to emit ultrasonic waves, the other transducer 50 is used to receive ultrasonic waves, and vice versa; for another example, when the number of transducers 50 is one, at this time, the transducer 50 can receive ultrasonic waves after emitting ultrasonic waves. Of course, the transducers 50 can also be multiple groups. The specific number of transducers 50 is not limited in the embodiments of the present application.

[0078] In addition, in the embodiments of the present application, the fluid can be various fluids such as water, oil, gas, alcohol, etc. When the fluid is water, at this time, the ultrasonic fluid flow measurement instrument can be used as a water meter to detect the flow rate of water; when the fluid is gas, at this time, the ultrasonic fluid flow measurement instrument can be used as a gas meter to detect the flow rate of gas; when the fluid is oil, at this time, the ultrasonic fluid flow measurement instrument can be used as an oil meter to detect the flow rate of oil.

[0079] In addition, in some embodiments, such as Figure 1As shown in the figure, the switch module 40 may include a first power supply branch 41 and a second power supply branch 42. One end of the first power supply branch 41 is connected to the power supply interface 101, and one end of the second power supply branch 42 is electrically connected to the battery 20. The other end of the first power supply branch 41 is electrically connected to the intermittently power - supplyable circuit unit 31, and conduction is possible between the first power supply branch 41 and the intermittently power - supplyable circuit unit 31. The other end of the second power supply branch 42 is connected to the intermittently power - supplyable circuit unit 31, and conduction is possible between the second power supply branch 42 and the intermittently power - supplyable circuit unit 31. When the external power supply 200 is not connected to the power supply interface 101, conduction does not occur between the first power supply branch 41 and the intermittently power - supplyable circuit unit 31, while conduction occurs between the second power supply branch 42 and the intermittently power - supplyable circuit unit 31, and the battery 20 supplies power to the intermittently power - supplyable circuit unit 31 through the second power supply branch 42. When the external power supply 200 is connected to the power supply interface 101, conduction occurs between the first power supply branch 41 and the intermittently power - supplyable circuit unit 31, while conduction does not occur between the second power supply branch 42 and the intermittently power - supplyable circuit unit 31, and the external power supply 200 supplies power to the intermittently power - supplyable circuit unit 31 through the first power supply branch 41.

[0080] Since one end of the first power supply branch 41 is connected to the power supply interface 101, the other end of the first power supply branch 41 is electrically connected to the intermittently power - supplyable circuit unit 31, and conduction is possible between the first power supply branch 41 and the intermittently power - supplyable circuit unit 31. Therefore, once the external power supply 200 is connected to the power supply interface 101 and conduction occurs between the first power supply branch 41 and the intermittently power - supplyable circuit unit 31, the external power supply 200 can supply power to the intermittently power - supplyable circuit unit 31, so that the power supply of the intermittently power - supplyable circuit unit 31 can vary to achieve various tests on the ultrasonic fluid flow measuring instrument. Since the second power supply branch 42 is electrically connected to the battery 20 and conduction is possible between the second power supply branch 42 and the intermittently power - supplyable circuit unit 31, once conduction occurs between the second power supply branch 42 and the intermittently power - supplyable circuit unit 31, the battery 20 can supply power to the intermittently power - supplyable circuit unit 31, enabling the normal operation of the ultrasonic fluid flow measuring instrument. That is, by setting the switch module 40 to include the first power supply branch 41 and the second power supply branch 42, it is convenient to make conduction occur between the external power supply 200 and the intermittently power - supplyable circuit unit 31 when the ultrasonic fluid flow measuring instrument needs to be tested or emergently powered, and the external power supply 200 supplies power to the intermittently power - supplyable circuit unit 31. When the ultrasonic fluid flow measuring instrument does not need to be tested or emergently powered, the battery 20 supplies power to the intermittently power - supplyable circuit unit 31, so that the ultrasonic fluid flow measuring instrument can operate normally.

[0081] In addition, in the embodiments of the present application, the total circuit module 30 may further include a circuit unit 32 that requires continuous power supply. The connection method of the power input terminal of the circuit unit 32 that requires continuous power supply may be different. The following two examples are used for specific illustration:

[0082] Method (1): As Figure 3 shown, the total circuit module 30 may further include a circuit unit 32 that requires continuous power supply; the battery 20 is electrically connected to the circuit unit 32 that requires continuous power supply, and the battery 20 supplies power to the circuit unit 32 that requires continuous power supply.

[0083] With such a setting, the battery 20 can supply power to the circuit unit 32 that requires continuous power supply, thereby ensuring that the circuit unit 32 that requires continuous power supply can operate continuously and ensuring that the ultrasonic fluid flow meter can operate normally continuously. Moreover, the battery 20 supplies power to the circuit unit 32 that requires continuous power supply, which is equivalent to that the battery 20 supplies power to the circuit unit 32 that requires continuous power supply regardless of whether the power interface 101 is connected to an external power supply 200.

[0084] In addition, in some embodiments, as Figure 3 shown, the first power supply branch 41 may include a first control switch 411, and the second power supply branch 42 may include a second control switch 421; the first end of the first control switch 411 is electrically connected to the power interface 101, the first end of the second control switch 421 is electrically connected to the battery 20, the second ends of the first control switch 411 and the second control switch 421 are electrically connected, and the second end of the first control switch 411 is electrically connected to the intermittently power-supplied circuit unit 31, and the battery 20 is electrically connected to the circuit unit 32 that requires continuous power supply; when the power interface 101 is not connected to an external power supply 200, the first control switch 411 is not turned on, and the second control switch 421 is turned on to make the second power supply branch 42 conduct with the intermittently power-supplied circuit unit 31, and the battery 20 supplies power to the intermittently power-supplied circuit unit 31 through the second control switch 421, and the battery 20 supplies power to the circuit unit 32 that requires continuous power supply; when the power interface 101 is connected to an external power supply 200, the first control switch 411 is turned on, and the second control switch 421 is not turned on to make the second power supply branch 42 not conduct with the intermittently power-supplied circuit unit 31, and the external power supply 200 supplies power to the intermittently power-supplied circuit unit 31 through the first control switch 411, and the battery 20 supplies power to the circuit unit 32 that requires continuous power supply.

[0085] Since the first end of the first control switch 411 is electrically connected to the power supply interface 101, the first end of the second control switch 421 is electrically connected to the battery 20, the second ends of the first control switch 411 and the second control switch 421 are electrically connected, and the second end of the first control switch 411 is electrically connected to the intermittently power - supplyable circuit unit 31, and the battery 20 is electrically connected to the continuously power - supplyable circuit unit 32. Therefore, when the first control switch 411 switches between conduction and non - conduction, and the second control switch 421 switches between conduction and non - conduction, the power supply to the intermittently power - supplyable circuit unit 31 can be different. Specifically, once the power supply interface 101 is connected to the external power supply 200, the first control switch 411 can be made to conduct, and the second control switch 421 can be made non - conductive. As a result, it is equivalent to making the second power supply branch 42 non - conductive with respect to the intermittently power - supplyable circuit unit 31. The electrical energy of the external power supply 200 can then be transferred to the first control switch 411 and passed through the first control switch 411 to the intermittently power - supplyable circuit unit 31. That is, the external power supply 200 supplies power to the intermittently power - supplyable circuit unit 31 through the first control switch 411, and the electrical energy of the battery 20 can be directly transferred to the continuously power - supplyable circuit unit 32. That is, when the power supply interface 101 is connected to the external power supply 200, the external power supply 200 supplies power to the intermittently power - supplyable circuit unit 31, and the battery 20 supplies power to the continuously power - supplyable circuit unit 32. When the power supply interface 101 is not connected to the external power supply 200, the first control switch 411 can be made non - conductive, and the second control switch 421 can be made conductive. As a result, the electrical energy of the battery 20 can be transferred to the second control switch 421 and passed through the second control switch 421 to the intermittently power - supplyable circuit unit 31. That is, the battery 20 supplies power to the intermittently power - supplyable circuit unit 31 through the second control switch 421, and the electrical energy of the battery 20 can be directly transferred to the continuously power - supplyable circuit unit 32. That is, when the power supply interface 101 is not connected to the external power supply 200, the battery 20 supplies power to the intermittently power - supplyable circuit unit 31 and the battery 20 supplies power to the continuously power - supplyable circuit unit 32. That is, by setting the first power supply branch 41 to include the first control switch 411 and the second power supply branch 42 to include the second control switch 421, it is possible to facilitate the switching of the states of the first control switch 411 and the second control switch 421, such that when the power supply interface 101 is connected to the external power supply 200, the first control switch 411 conducts and the second control switch 421 does not conduct, and when the power supply interface 101 is not connected to the external power supply 200, the first control switch 411 does not conduct and the second control switch 421 conducts. This facilitates the power supply to the intermittently power - supplyable circuit unit 31 in different states, and when the power supply interface 101 is connected to the external power supply 200, it also facilitates the testing of the ultrasonic fluid flow measuring instrument.

[0086] In addition, in some embodiments, such as Figure 3As shown, the ultrasonic fluid flow measuring instrument may further include a first capacitor 001. The first end of the first capacitor 001 is electrically connected to the electrical connection point between the battery 20 and the circuit unit 32 that needs to be continuously powered, and the second end of the first capacitor 001 is grounded.

[0087] With such a setting, when the battery 20 powers the circuit unit 32 that needs to be continuously powered, the electrical energy of the battery 20 will flow through the first capacitor 001. Thus, the first capacitor 001 can filter out the noise in the electrical energy transmitted to the circuit unit 32 that needs to be continuously powered, ensuring that there is less noise in the electrical energy transmitted to the circuit unit 32 that needs to be continuously powered. That is, by setting the first capacitor 001, it can effectively ensure that there is less noise in the electrical energy transmitted to the circuit unit 32 that needs to be continuously powered.

[0088] In addition, in some embodiments, as Figure 3 shown, the ultrasonic fluid flow measuring instrument may further include a second capacitor 002. The first end of the second capacitor 002 is electrically connected to the second end of the second control switch 421, and the second end of the second capacitor 002 is grounded.

[0089] With such a setting, when an external power supply 200 is connected to the power supply interface 101 and the external power supply 200 powers the intermittently powerable circuit unit 31, the electrical energy of the external power supply 200 will flow through the first control switch 411 and reach the second end of the second control switch 421, and then flow through the second capacitor 002. The second capacitor 002 can filter out the noise in the electrical energy transmitted to the intermittently powerable circuit unit 31, reducing the power supply ripple. Also, when the external power supply 200 is not connected to the power supply interface 101 and the battery 20 powers the intermittently powerable circuit unit 31, the electrical energy of the battery 20 will flow through the second control switch 421 and reach the second end of the second control switch 421, and then flow through the second capacitor 002. The second capacitor 002 can filter out the noise in the electrical energy transmitted to the intermittently powerable circuit unit 31, reducing the power supply ripple. That is, by setting the second capacitor 002, it can ensure that there is less noise in the electrical energy transmitted to the intermittently powerable circuit unit 31.

[0090] Method (2): As Figure 2As shown, the total circuit module 30 further includes a circuit unit 32 that requires continuous power supply; the power input terminal of the circuit unit 32 that requires continuous power supply is electrically connected to the power input terminal of the circuit unit 31 that can be intermittently powered; the other end of the first power supply branch 41 is also electrically connected to the circuit unit 32 that requires continuous power supply, and the first power supply branch 41 and the circuit unit 32 that requires continuous power supply can be conducted; the second power supply branch 42 and the circuit unit 32 that requires continuous power supply can be conducted; when the power interface 101 is not connected to the external power supply 200, the first power supply branch 41 and the circuit unit 32 that requires continuous power supply are not conducted, and the second power supply branch 42 and the circuit unit 32 that requires continuous power supply are conducted, and the battery 20 supplies power to the circuit unit 32 that requires continuous power supply through the second power supply branch 42; when the power interface 101 is connected to the external power supply 200, the first power supply branch 41 and the circuit unit 32 that requires continuous power supply are conducted, and the second power supply branch 42 and the circuit unit 32 that requires continuous power supply are not conducted, and the external power supply 200 supplies power to the circuit unit 32 that requires continuous power supply through the first power supply branch 41.

[0091] Since one end of the first power supply branch 41 is electrically connected to the power interface 101, the other end of the first power supply branch 41 is also electrically connected to the circuit unit 32 that requires continuous power supply, the first power supply branch 41 and the circuit unit 32 that requires continuous power supply can be conducted, the second power supply branch 42 and the circuit unit 32 that requires continuous power supply can be conducted, and the second power supply branch 42 is electrically connected to the battery 20. Therefore, once the power interface 101 is connected to the external power supply 200, it can make the second power supply branch 42 and the circuit unit 32 that requires continuous power supply not conducted, and the first power supply branch 41 and the circuit unit 32 that requires continuous power supply conducted. Thus, when the electric energy of the external power supply 200 is transmitted to the first power supply branch 41, the electric energy can be transmitted to the circuit unit 32 that requires continuous power supply through the first power supply branch 41, and thus the external power supply 200 supplies power to the circuit unit 32 that requires continuous power supply through the first power supply branch 41; when the power interface 101 is not connected to the external power supply 200, it can make the second power supply branch 42 and the circuit unit 32 that requires continuous power supply conducted, and the first power supply branch 41 and the circuit unit 32 that requires continuous power supply not conducted. Thus, when the electric energy of the battery 20 is transmitted to the second power supply branch 42, the electric energy can be transmitted to the circuit unit 32 that requires continuous power supply through the second power supply branch 42, and thus the battery 20 supplies power to the circuit unit 32 that requires continuous power supply through the second power supply branch 42. That is, through such a setting, when the power interface 101 is connected to the external power supply 200, the external power supply 200 supplies power to the circuit unit 32 that requires continuous power supply, and the power consumption of the battery 20 can be reduced.

[0092] That is, when an external power supply 200 is connected to the power supply interface 101, the second power supply branch 42 is not conducting with both the intermittently power - supplyable circuit unit 31 and the continuously power - supplyable circuit unit 32, and the first power supply branch 41 is conducting with the continuously power - supplyable circuit unit 32. Thus, when the electric energy of the external power supply 200 is transferred to the first power supply branch 41, the electric energy can be transferred through the first power supply branch 41 to the continuously power - supplyable circuit unit 32 and the intermittently power - supplyable circuit unit 31, enabling the external power supply 200 to supply power to both the continuously power - supplyable circuit unit 32 and the intermittently power - supplyable circuit unit 31 simultaneously; when the external power supply 200 is not connected to the power supply interface 101, the second power supply branch 42 is conducting with the intermittently power - supplyable circuit unit 31, and the first power supply branch 41 is not conducting with both the intermittently power - supplyable circuit unit 31 and the continuously power - supplyable circuit unit 32. Thus, when the electric energy of the battery 20 is transferred to the second power supply branch 42, the electric energy can be transferred through the second power supply branch 42 to the continuously power - supplyable circuit unit 32 and the intermittently power - supplyable circuit unit 31, enabling the battery 20 to supply power to both the continuously power - supplyable circuit unit 32 and the intermittently power - supplyable circuit unit 31 simultaneously.

[0093] In addition, in some embodiments, as Figure 4 shown, the first power supply branch 41 may include a first control switch 411, and the second power supply branch 42 may include a second control switch 421; the first end of the first control switch 411 is electrically connected to the power supply interface 101, the first end of the second control switch 421 is electrically connected to the battery 20, the second ends of the first control switch 411 and the second control switch 421 are electrically connected, and the second end of the first control switch 411 is electrically connected to the intermittently power - supplyable circuit unit 31; when the external power supply 200 is not connected to the power supply interface 101, the first control switch 411 is not conducting, and the second control switch 421 is conducting, so that the second power supply branch 42 is conducting with the intermittently power - supplyable circuit unit 31, and the battery 20 supplies power to the intermittently power - supplyable circuit unit 31 through the second control switch 421; when the external power supply 200 is connected to the power supply interface 101, the first control switch 411 is conducting, and the second control switch 421 is not conducting, so that the second power supply branch 42 is not conducting with the intermittently power - supplyable circuit unit 31, and the external power supply 200 supplies power to the intermittently power - supplyable circuit unit 31 through the first control switch 411.

[0094] Since the first end of the first control switch 411 is electrically connected to the power supply interface 101, the first end of the second control switch 421 is electrically connected to the battery 20, the second ends of the first control switch 411 and the second control switch 421 are electrically connected, and the second end of the first control switch 411 is electrically connected to the intermittently power - supplyable circuit unit 31, therefore, when the first control switch 411 switches between conduction and non - conduction, and the second control switch 421 switches between conduction and non - conduction, the power supply to the intermittently power - supplyable circuit unit 31 can be different. Specifically, once the power supply interface 101 is connected to the external power supply 200, it can make the first control switch 411 conductive and the second control switch 421 non - conductive, thus making the second power - supply branch 42 non - conductive to the intermittently power - supplyable circuit unit 31. The electrical energy of the external power supply 200 can then be transmitted to the first control switch 411 and through the first control switch 411 to the intermittently power - supplyable circuit unit 31, that is, the external power supply 200 supplies power to the intermittently power - supplyable circuit unit 31 through the first control switch 411; when the power supply interface 101 is not connected to the external power supply 200, it can make the first control switch 411 non - conductive and the second control switch 421 conductive, so that the electrical energy of the battery 20 can be transmitted to the second control switch 421 and through the second control switch 421 to the intermittently power - supplyable circuit unit 31, that is, the battery 20 supplies power to the intermittently power - supplyable circuit unit 31 through the second control switch 421. That is, by setting that the first power - supply branch 41 can include the first control switch 411 and the second power - supply branch 42 can include the second control switch 421, it is convenient to switch the states of the first control switch 411 and the second control switch 421, so that when the power supply interface 101 is connected to the external power supply 200, the first control switch 411 is conductive and the second control switch 421 is non - conductive, and when the power supply interface 101 is not connected to the external power supply 200, the first control switch 411 is non - conductive and the second control switch 421 is conductive, which is convenient to supply power to the intermittently power - supplyable circuit unit 31 in different states, and when the power supply interface 101 is connected to the external power supply 200, it is also convenient to test the ultrasonic fluid flow measuring instrument. That is, in the embodiment of the present application, when the total circuit module 30 includes an intermittently power - supplyable circuit unit 31, by setting that the first power - supply branch 41 can include the first control switch 411 and the second power - supply branch 42 can include the second control switch 421, the test of the ultrasonic fluid flow measuring instrument can be realized.

[0095] Wherein, when the total circuit module 30 further includes a circuit unit 32 that requires continuous power supply, the power input terminal of the circuit unit 32 that requires continuous power supply is electrically connected to the power input terminal of the circuit unit 31 that can be intermittently powered. Thus, once the power interface 101 is connected to the external power supply 200, the first control switch 411 can be made to conduct, and the second control switch 421 does not conduct. This is equivalent to making the second power supply branch 42 not conduct with both the circuit unit 31 that can be intermittently powered and the circuit unit 32 that requires continuous power supply. The electrical energy of the external power supply 200 can then be transmitted to the first control switch 411 and through the first control switch 411 to the circuit unit 31 that can be intermittently powered. And because the power input terminal of the circuit unit 32 that requires continuous power supply is electrically connected to the power input terminal of the circuit unit 31 that can be intermittently powered, the electrical energy of the external power supply 200 is also transmitted through the first control switch 411 to the circuit unit 32 that requires continuous power supply. That is, the external power supply 200 supplies power to the circuit unit 31 that can be intermittently powered and the circuit unit 32 that requires continuous power supply through the first control switch 411. When the power interface 101 is not connected to the external power supply 200, the first control switch 411 can be made not to conduct, and the second control switch 421 conducts. Thus, the electrical energy of the battery 20 can be transmitted to the second control switch 421 and through the second control switch 421 to the circuit unit 31 that can be intermittently powered. And because the power input terminal of the circuit unit 32 that requires continuous power supply is electrically connected to the power input terminal of the circuit unit 31 that can be intermittently powered, the electrical energy of the battery 20 is also transmitted through the second control switch 421 to the circuit unit 32 that requires continuous power supply. That is, the battery 20 supplies power to the circuit unit 31 that can be intermittently powered and the circuit unit 32 that requires continuous power supply through the second control switch 421.

[0096] In addition, in some embodiments, as Figure 4 shown, the ultrasonic fluid flow measurement instrument may further include a third capacitor 003. The first end of the third capacitor 003 is electrically connected to the second end of the second control switch 421, and the second end of the third capacitor 003 is grounded.

[0097] With such a setting, when an external power supply 200 is connected to the power interface 101, the external power supply 200 supplies power to the intermittently power - supplyable circuit unit 31. The electric energy of the external power supply 200 will flow through the third capacitor 003 and then to the intermittently power - supplyable circuit unit 31. Thus, the third capacitor 003 will filter out the noise in the electric energy, making the electric energy transmitted to the intermittently power - supplyable circuit unit 31 have less noise. When the external power supply 200 is not connected to the power interface 101, the battery 20 supplies power to the intermittently power - supplyable circuit unit 31. The electric energy of the battery 20 will flow through the third capacitor 003 and then to the intermittently power - supplyable circuit unit 31. Thus, the third capacitor 003 will filter out the noise in the electric energy, making the electric energy transmitted to the intermittently power - supplyable circuit unit 31 have less noise. Among them, when the total circuit module 30 includes a continuously power - supplyable circuit unit 32 and the power input terminal of the continuously power - supplyable circuit unit 32 is electrically connected to the power input terminal of the intermittently power - supplyable circuit unit 31, at this time, the electric energy flowing to the intermittently power - supplyable circuit unit 31 will also flow to the continuously power - supplyable circuit unit 32. Thus, the third capacitor 003 can simultaneously filter out the noise in the electric energy transmitted to both the intermittently power - supplyable circuit unit 31 and the continuously power - supplyable circuit unit 32.

[0098] In addition, in some embodiments, such as Figure 4 shown, the ultrasonic fluid flow measurement instrument may further include a fourth capacitor 004. The first end of the fourth capacitor 004 is electrically connected to the intermittently power - supplyable circuit unit 31, and the first end of the fourth capacitor 004 is electrically connected to the second end of the second control switch 421. The second end of the fourth capacitor 004 is grounded, and the fourth capacitor 004 is connected in parallel with the third capacitor 003.

[0099] Generally, the capacitance of the fourth capacitor 004 is much larger than that of the third capacitor 003. With such a setting, at the moment when the first control switch 411 is turned on and the second control switch 421 is turned off, the fourth capacitor 004 can transfer the electric energy stored in itself to the intermittently power - supplyable circuit unit 31, thereby supplying power to the intermittently power - supplyable circuit unit 31. When the continuously power - supplyable circuit unit 32 is electrically connected to the intermittently power - supplyable circuit unit 31, the electric energy of the fourth capacitor 004 can be transferred to the continuously power - supplyable circuit unit 32, ensuring that the continuously power - supplyable circuit unit 32 can be continuously powered, and further ensuring the stability of the operation of the ultrasonic fluid flow measurement device. Once the electric energy of the external power supply 200 is transferred to the first control switch 411 and then to the intermittently power - supplyable circuit unit 31, the fourth capacitor 004 can also play a role in filtering out the noise in the electric energy, further reducing the noise in the electric energy transmitted to both the intermittently power - supplyable circuit unit 31 and the continuously power - supplyable circuit unit 32.

[0100] In addition, in some embodiments, such as Figure 3 or Figure 4As shown, the ultrasonic fluid flow measurement instrument may further include a control module 70; the control module 70 is electrically connected to the first control switch 411 and the second control switch 421 respectively, and the control module 70 is used to control the first control switch 411 and the second control switch 421 so that both the first control switch 411 and the second control switch 421 can switch between the on state and the off state.

[0101] With such a setting, the control module 70 can control the first control switch 411 and the second control switch 421 in real time, so that both the first control switch 411 and the second control switch 421 can switch between the on state and the off state, thereby ensuring that the states of the first control switch 411 and the second control switch 421 can be switched in a timely and effective manner, which is convenient for powering and testing the ultrasonic fluid flow measurement instrument when an external power supply 200 is connected to the power interface 101, and is also convenient for the ultrasonic fluid flow measurement instrument to operate normally when the external power supply 200 is not connected to the power interface 101.

[0102] In addition, in some embodiments, as Figure 5 shown, the first control switch 411 may be a diode, and the second control switch 421 may be a MOS transistor. The control module 70 includes a first resistor 71 and a buffer 72; the first resistor 71 is grounded, and the first resistor 71 is electrically connected to the power interface 101, the buffer 72, and the diode; the first end of the buffer 72 is electrically connected to the power interface 101, the diode, and the first resistor 71 respectively; the second end of the buffer 72 is electrically connected to the MOS transistor.

[0103] With such a setting, once the external power supply 200 is connected to the power interface 101, the buffer 72 in the electrically connected state with the external power supply 200 can more accurately ensure that the gate voltage of the MOS transistor is at a high level, so as to ensure that when the external power supply 200 is connected to the power interface 101, the MOS transistor can be stably turned off, that is, equivalent to the MOS transistor being non-conductive, and the electric energy of the external power supply 200 can directly flow through the diode to supply power to the intermittently powerable circuit unit 31; once the external power supply 200 is not connected to the power interface 101, the first resistor 71 in the pull-down state can ensure that the gate voltage of the MOS transistor is at a low level through the buffer 72 to ensure that the MOS transistor is stably turned on, that is, equivalent to the MOS transistor being conductive, and the electric energy of the battery 20 can flow through the MOS transistor to supply power to the intermittently powerable circuit unit 31. Moreover, due to the presence of the first resistor 71, the first resistor 71 pulls down the input end of the diode to a low level, thereby ensuring that the diode is stably cut off. That is, by setting the control module 70 to include the first resistor 71 and the buffer 72, the switching states of the diode and the MOS transistor can be effectively controlled.

[0104] It should be noted that the buffer 72 can also be implemented by using two cascaded inverters 75 or other means to achieve the above functions of the buffer 72. Of course, the buffer 72 can also be implemented by other equivalent circuits, and the embodiments of the present application do not limit this.

[0105] In addition, in some embodiments, as Figure 6 shown, the first control switch 411 and the second control switch 421 are both MOS transistors. The control module 70 includes a second resistor 73, a third resistor 74, an inverter 75, and a buffer 72. The output terminal of the inverter 75 is electrically connected to the MOS transistor corresponding to the first control switch 411. The input terminal of the inverter 75 is electrically connected to the input terminal of the buffer 72. The output terminal of the buffer 72 is electrically connected to the MOS transistor corresponding to the second control switch 421. The first terminal of the second resistor 73 is electrically connected to the MOS transistor corresponding to the first control switch 411 and is electrically connected to the power supply interface 101. The second terminal of the second resistor 73 is electrically connected to the first terminal of the third resistor 74. The second terminal of the third resistor 74 is grounded. The connection point where the input terminal of the inverter 75 is electrically connected to the input terminal of the buffer 72 is electrically connected to the second terminal of the second resistor 73.

[0106] Among them, the resistance value of the second resistor 73 is much smaller than that of the third resistor 74. Once the power supply interface 101 is connected to the external power supply 200, the second resistor 73 and the third resistor 74 form a voltage division. Since the resistance value of the second resistor 73 is much smaller than that of the third resistor 74, the input terminal of the inverter 75 is at a high level, and the output terminal of the inverter 75 is at a low level. At this time, the inverter 75 outputs a low level, thereby forcing the gate of the MOS transistor corresponding to the first control switch 411 to be at a low level, making the first control switch 411 conduct, and making the MOS transistor corresponding to the second control switch 421 non-conduct. The external power supply 200 supplies power to the intermittently powerable circuit unit 31 through the conducting first control switch 411. When the power supply interface 101 is not connected to the external power supply 200, the series-connected second resistor 73 and third resistor 74 pull down the source of the MOS transistor corresponding to the first control switch 411 to the ground, and at the same time pull down the input terminal of the inverter 75 to the ground, while the output terminal of the inverter 75 is set to a high level. Thus, the high level output by the inverter 75 makes the MOS transistor corresponding to the first control switch 411 non-conduct, and makes the MOS transistor corresponding to the second control switch 421 conduct. The battery 20 supplies power to the intermittently powerable circuit unit 31 through the conducting second control switch 421.

[0107] It should be noted that in the embodiments of the present application, the MOS transistor is described as a P-type MOS transistor. Of course, it can also be an N-type MOS transistor. At this time, the control module 70 can be adjusted accordingly to achieve the control of the N-type MOS transistor. The specific type of the MOS transistor is not limited in the embodiments of the present application.

[0108] In addition, in the embodiments of the present application, the control module 70 may also be formed by other components. For example, the control module 70 is implemented by two cascaded inverters 75 or the like to achieve the functional role of the above buffer 72. In this regard, the embodiments of the present application are not limited.

[0109] In addition, in some embodiments, as Figure 7 shown, the ultrasonic fluid flow measurement instrument may further include a plug-in structure (not shown in the figure). The plug-in structure is provided with a plug-in hole 100. The first power supply branch 41 includes a first terminal 412, and the second power supply branch 42 includes a second terminal 422. Both the first terminal 412 and the second terminal 422 are disposed in the plug-in hole 100. A reed 110 is further disposed in the plug-in hole 100, and the plug-in hole 100 forms a power supply interface 101. The first terminal 412 and the second terminal 422 are spaced apart. One end of the reed 110 is connected to the first terminal 412, and the other end of the reed 110 is movable relative to the plug-in hole 100, and the other end of the reed 110 can be switched between a first position and a second position. The battery 20 is electrically connected to the second terminal 422, and the first terminal 412 is electrically connected to the intermittently power-supplied circuit unit 31. The battery 20 is electrically connected to the circuit unit 32 that needs to be continuously powered. When the external power supply 200 is not connected to the power supply interface 101, the other end of the reed 110 is located at the first position, and the other end of the reed 110 contacts the second terminal 422, and the first terminal 412 and the second terminal 422 are electrically connected, so that the second power supply branch 42 and the intermittently power-supplied circuit unit 31 are electrically connected. The battery 20 supplies power to the intermittently power-supplied circuit unit 31 through the reed 110, the first terminal 412, and the second terminal 422, and the battery 20 directly supplies power to the circuit unit 32 that needs to be continuously powered. When the external power supply 200 is connected to the power supply interface 101, the external power supply 200 abuts against the reed 110, the other end of the reed 110 is located at the second position, and the other end of the reed 110 is separated from the second terminal 422, and the first terminal 412 and the second terminal 422 are not electrically connected, so that the second power supply branch 42 and the intermittently power-supplied circuit unit 31 are not electrically connected. The external power supply 200 is electrically connected to the first terminal 412 through the reed 110 to form a conductive first power supply branch 41. The external power supply 200 supplies power to the intermittently power-supplied circuit unit 31 through the reed 110 and the first terminal 412, and the battery 20 directly supplies power to the circuit unit 32 that needs to be continuously powered.

[0110] Since the first terminal 412 and the second terminal 422 are spaced apart, one end of the reed 110 is connected to the first terminal 412, and the other end of the reed 110 is movable relative to the insertion hole 100. Therefore, when the reed 110 moves, the other end of the reed 110 can switch between a first position and a second position. Since the battery 20 is electrically connected to the second terminal 422, the first terminal 412 is electrically connected to the intermittently power-supplied circuit unit 31, and the battery 20 is electrically connected to the continuously power-supplied circuit unit 32. Therefore, once an external power source 200 is inserted into the insertion hole 100, the external power source 200 can contact the reed 110, which is equivalent to the power interface 101 accessing the external power source 200, and the external power source 200 abuts against the reed 110, so that the other end of the reed 110 is located at the second position, and the other end of the reed 110 is separated from the second terminal 422, and the first terminal 412 and the second terminal 422 are not electrically connected, so that the second power supply branch 42 and the intermittently power-supplied circuit unit 31 are not electrically connected. The external power source 200 can be electrically connected to the first terminal 412 through the reed 110 to form a conducting first power supply branch 41. The external power source 200 supplies power to the intermittently power-supplied circuit unit 31 through the reed 110 and the first terminal 412, and the battery 20 supplies power to the continuously power-supplied circuit unit 32; when the external power source 200 is not inserted into the insertion hole 100, the other end of the reed 110 is located at the first position, and the other end of the reed 110 contacts the second terminal 422, so that the first terminal 412 and the second terminal 422 are electrically connected through the reed 110, so that the second power supply branch 42 and the intermittently power-supplied circuit unit 31 are electrically connected, and the battery 20 supplies power to the intermittently power-supplied circuit unit 31 through the reed 110, the first terminal 412 and the second terminal 422, and the battery 20 supplies power to the continuously power-supplied circuit unit 32. That is, by providing the first terminal 412, the second terminal 422 and the reed 110, it is convenient for the external power source 200 to supply power to the intermittently power-supplied circuit unit 31 when the external power source 200 is inserted into the insertion hole 100, and for the battery 20 to supply power to the intermittently power-supplied circuit unit 31 when the external power source 200 is not inserted into the insertion hole 100.

[0111] It should be noted that in the embodiments of the present application, the number of the first terminals 412 and the number of the second terminals 422 can both be set according to actual needs. For example, the number of the first terminals 412 is two, and the number of the second terminals 422 is two. For another example, the number of the first terminals 412 is one, and the number of the second terminals 422 is one. In this regard, the embodiments of the present application do not make any limitations here.

[0112] In addition, in some embodiments, such as Figure 7As shown, the ultrasonic fluid flow measuring instrument may further include a fifth capacitor 005; a first end of the fifth capacitor 005 is electrically connected to the first terminal 412, and a second end of the fifth capacitor 005 is grounded.

[0113] With such an arrangement, when the power supply interface 101 is connected to an external power supply 200 and the external power supply 200 supplies power to the intermittently powerable circuit unit 31, the electrical energy of the external power supply 200 will flow through the first terminal 412 and reach the fifth capacitor 005. The fifth capacitor 005 can then filter out the noise in the electrical energy transmitted to the intermittently powerable circuit unit 31 and reduce the power supply ripple; and when the power supply interface 101 is not connected to the external power supply 200, the battery 20 supplies power to the intermittently powerable circuit unit 31. The electrical energy of the battery 20 will flow through the second terminal 422, reach the first terminal 412, and then flow through the fifth capacitor 005. The fifth capacitor 005 can then filter out the noise in the electrical energy transmitted to the intermittently powerable circuit unit 31 and reduce the power supply ripple. That is, by providing the fifth capacitor 005, it can be ensured that there is less noise in the electrical energy transmitted to the intermittently powerable circuit unit 31.

[0114] In addition, in some embodiments, as Figure 7 shown, the ultrasonic fluid flow measuring instrument may further include a sixth capacitor 006; a first end of the sixth capacitor 006 is electrically connected to the battery 20, and a second end of the sixth capacitor 006 is grounded.

[0115] With such an arrangement, when the battery 20 supplies power to the continuously powerable circuit unit 32, the electrical energy of the battery 20 will flow through the sixth capacitor 006. Thus, the sixth capacitor 006 can filter out the noise in the electrical energy transmitted to the continuously powerable circuit unit 32 and ensure that there is less noise in the electrical energy transmitted to the continuously powerable circuit unit 32. That is, by providing the sixth capacitor 006, it can be effectively ensured that there is less noise in the electrical energy transmitted to the continuously powerable circuit unit 32.

[0116] In addition, in some embodiments, as Figure 10As shown, the ultrasonic fluid flow measurement instrument may further include a plugging structure (not shown in the figure). The plugging structure is provided with a plugging hole 100. The first power supply branch 41 includes a first terminal 412, and the second power supply branch 42 includes a second terminal 422. Both the first terminal 412 and the second terminal 422 are disposed in the plugging hole 100. A reed 110 is also disposed in the plugging hole 100, and the plugging hole 100 forms a power interface 101. The first terminal 412 and the second terminal 422 are spaced apart. One end of the reed 110 is connected to the first terminal 412, and the other end of the reed 110 is movable relative to the plugging hole 100, and the other end of the reed 110 can be switched between a first position and a second position. The battery 20 is electrically connected to the second terminal 422, and the first terminal 412 is electrically connected to the intermittently power-supplied circuit unit 31. When the external power supply 200 is not connected to the power interface 101, the other end of the reed 110 is located at the first position, and the other end of the reed 110 contacts the second terminal 422, and the first terminal 412 and the second terminal 422 are electrically connected, so that the second power supply branch 42 is electrically connected to the intermittently power-supplied circuit unit 31, and the battery 20 supplies power to the intermittently power-supplied circuit unit 31 through the reed 110, the first terminal 412, and the second terminal 422. When the external power supply 200 is connected to the power interface 101, the external power supply 200 abuts against the reed 110, the other end of the reed 110 is located at the second position, and the other end of the reed 110 is separated from the second terminal 422, and the first terminal 412 and the second terminal 422 are not electrically connected, so that the second power supply branch 42 is not electrically connected to the intermittently power-supplied circuit unit 31, and the external power supply 200 supplies power to the intermittently power-supplied circuit unit 31 through the reed 110 and the first terminal 412.

[0117] Since the first terminal 412 and the second terminal 422 are spaced apart, one end of the reed 110 is connected to the first terminal 412, and the other end of the reed 110 is movable relative to the insertion hole 100. Therefore, when the reed 110 moves, the other end of the reed 110 can switch between a first position and a second position. Since the battery 20 is electrically connected to the second terminal 422 and the first terminal 412 is electrically connected to the intermittently power-supplied circuit unit 31, once an external power supply 200 is inserted into the insertion hole 100, the external power supply 200 can contact the reed 110, which is equivalent to the power interface 101 accessing the external power supply 200, and the external power supply 200 abuts against the reed 110, so that the other end of the reed 110 is located at the second position, and the other end of the reed 110 is separated from the second terminal 422, and the first terminal 412 and the second terminal 422 are not electrically connected, so that the second power supply branch 42 and the intermittently power-supplied circuit unit 31 are not electrically connected. The external power supply 200 can be electrically connected to the first terminal 412 through the reed 110 to form a conductive first power supply branch 41, and the external power supply 200 supplies power to the intermittently power-supplied circuit unit 31 through the reed 110 and the first terminal 412; when the external power supply 200 is not inserted into the insertion hole 100, the other end of the reed 110 is located at the first position, and the other end of the reed 110 contacts the second terminal 422, so that the first terminal 412 and the second terminal 422 are electrically connected through the reed 110, so that the second power supply branch 42 and the intermittently power-supplied circuit unit 31 are electrically connected, and the battery 20 supplies power to the intermittently power-supplied circuit unit 31 through the reed 110, the first terminal 412 and the second terminal 422. That is, by providing the first terminal 412, the second terminal 422 and the reed 110, when the external power supply 200 is inserted into the insertion hole 100, the external power supply 200 supplies power to the intermittently power-supplied circuit unit 31, and when the external power supply 200 is not inserted into the insertion hole 100, the battery 20 supplies power to the intermittently power-supplied circuit unit 31.

[0118] Wherein, when the total circuit module 30 includes a circuit unit 32 that needs continuous power supply, the input end of the circuit unit 32 that needs continuous power supply is electrically connected to the input end of the intermittently power-supplied circuit unit 31. Therefore, when the electric energy of the external power supply 200 is transmitted to the intermittently power-supplied circuit unit 31, the electric energy can be transmitted to the circuit unit 32 that needs continuous power supply, which is equivalent to the external power supply 200 supplying power to the intermittently power-supplied circuit unit 31 and the circuit unit 32 that needs continuous power supply at the same time; when the electric energy of the battery 20 is transmitted to the intermittently power-supplied circuit unit 31, the electric energy can be transmitted to the circuit unit 32 that needs continuous power supply, which is equivalent to the battery 20 supplying power to the intermittently power-supplied circuit unit 31 and the circuit unit 32 that needs continuous power supply at the same time.

[0119] In addition, in some embodiments, such as Figure 10As shown, the ultrasonic fluid flow measuring instrument further includes a seventh capacitor 007; a first end of the seventh capacitor 007 is electrically connected to the battery 20, and a second end of the seventh capacitor 007 is grounded.

[0120] With such an arrangement, when the battery 20 powers the intermittently powerable circuit unit 31, the electrical energy of the battery 20 will flow through the seventh capacitor 007. Thus, the seventh capacitor 007 can filter out the noise in the electrical energy transmitted to the intermittently powerable circuit unit 31, ensuring that there is less noise in the electrical energy transmitted to the intermittently powerable circuit unit 31. That is, by providing the sixth capacitor 006, it can effectively ensure that there is less noise in the electrical energy transmitted to the intermittently powerable circuit unit 31.

[0121] In addition, in some embodiments, as Figure 10 shown, the ultrasonic fluid flow measuring instrument may further include an eighth capacitor 008; a first end of the eighth capacitor 008 is electrically connected to the intermittently powerable circuit unit 31 and the first terminal 412, and a second end of the eighth capacitor 008 is grounded.

[0122] With such an arrangement, at the moment when the other end of the reed 110 is separated from the second terminal 422, the eighth capacitor 008 can transfer the electrical energy stored in itself to the intermittently powerable circuit unit 31, thereby powering the intermittently powerable circuit unit 31. When the power input end of the continuously powerable circuit unit 32 is electrically connected to the power input end of the intermittently powerable circuit unit 31, the electrical energy of the eighth capacitor 008 can be transferred to the continuously powerable circuit unit 32, ensuring that the continuously powerable circuit unit 32 can be continuously powered, and further ensuring the stability of the operation of the ultrasonic fluid flow measuring device. Once the electrical energy of the external power supply 200 is transmitted to the first terminal 412 and transmitted to the intermittently powerable circuit unit 31, the eighth capacitor 008 can also play a role in filtering out the noise in the electrical energy, further reducing the noise in the electrical energy transmitted to the intermittently powerable circuit unit 31 and the continuously powerable circuit unit 32.

[0123] It should be noted that in the embodiments of the present application, the switch module 40 may also be formed by other structures, not limited to the first control switch 411, the second control switch 421, etc. already described. For example, the switch module 40 may also be jointly formed by a power interface 101, the power output end of the battery 20, and the jumper metal pins and jumper caps electrically connected to the power input end of the intermittently powerable circuit unit 31. As long as the structure provided can enable the external power supply 200 or the battery 20 to power the intermittently powerable circuit unit 31, that is, as long as the structure provided can switch between internal and external power supplies. The specific structure or form of the switch module 40 is not limited in the embodiments of the present application.

[0124] In addition, in the embodiments of the present application, the ultrasonic fluid flowmeter may further include a housing 10 and a circuit board (not shown in the figure); the battery 20, the main circuit module 30, the switch module 40, the transducer 50, the measuring tube 60, and the circuit board are all disposed in the housing 10, and the main circuit module 30 and the switch module 40 are integrated on the circuit board, and the power interface 101 is disposed on the housing 10 or the circuit board.

[0125] Since the battery 20, the main circuit module 30, the switch module 40, the transducer 50, the measuring tube 60, and the circuit board are all disposed in the housing 10, the housing 10 can protect the battery 20, the main circuit module 30, the switch module 40, the transducer 50, and the measuring tube 60, avoiding the problem that these components are easily damaged. The integration of the main circuit module 30 and the switch module 40 on the circuit board can result in a relatively high integration level of the ultrasonic fluid flowmeter. In addition, the power interface 101 can be disposed on the housing 10 according to actual needs; of course, the power interface 101 can also be disposed on the circuit board, that is, the power interface 101 is integrated on the circuit board, which can improve the manufacturability of the ultrasonic fluid flowmeter.

[0126] In addition, in the embodiments of the present application, when the ultrasonic fluid flowmeter includes a control module 70, the control module 70 may also be located in the housing 10.

[0127] In the embodiment of the present application, since the transducer 50 is disposed in the measuring tube 60 and the transducer 50 is electrically connected to the total circuit module 30, the transducer 50 can periodically transmit and receive ultrasonic waves under the control of the total circuit module 30. When the fluid in the measuring tube 60 flows, the total circuit module 30 can calculate the time difference of the ultrasonic transit times in the downstream and upstream directions based on the measurement of the ultrasonic wave transmission and reception events of the transducer 50, and then determine the flow velocity and flow rate of the fluid in the measuring tube 60 by using the specifications of the measuring tube and the transducer and the type of the fluid. Since the power supply interface 101 is electrically connected to the switch module 40, the battery 20 is electrically connected to the switch module 40, and the switch module 40 is electrically connected to the intermittently powerable circuit unit 31, when various tests need to be performed on the ultrasonic fluid flow measuring instrument, an external power supply 200 can be connected to the power supply interface 101. Thus, the external power supply 200 supplies power to the intermittently powerable circuit unit 31 through the switch module 40, so that the power supply of the intermittently powerable circuit unit 31 can change with the power output of the external power supply 200, thereby enabling various tests to be performed on the ultrasonic fluid flow measuring instrument. When the external power supply 200 is not connected to the power supply interface 101, the battery 20 supplies power to the intermittently powerable circuit unit 31, enabling the ultrasonic fluid flow measuring instrument to operate normally. That is, in the embodiment of the present application, the power supply interface 101 is electrically connected to the switch module 40, the battery 20 is electrically connected to the switch module 40, and the switch module 40 is electrically connected to the intermittently powerable circuit unit 31. Thus, when tests need to be performed on the ultrasonic fluid flow measuring instrument, the external power supply 200 can be connected to the power supply interface 101, so that the external power supply 200 supplies power with different characteristics to the intermittently powerable circuit unit 31 through the switch module 40 for testing the ultrasonic fluid flow measuring instrument. When no tests are required, the battery 20 supplies power to the intermittently powerable circuit unit 31. That is, in the embodiment of the present application, the power supply characteristics of the intermittently powerable circuit unit 31 can be effectively changed to implement various tests on the ultrasonic fluid flow measuring instrument.

[0128] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0129] Although embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. An ultrasonic fluid flow measurement instrument, characterized in that: The ultrasonic fluid flow measurement instrument comprises: a battery, a total circuit module, a switch module, a transducer, a measuring tube and a power supply interface; The transducer is arranged on the measuring tube, and the transducer is electrically connected to the total circuit module, and the total circuit module includes a circuit unit capable of intermittent power supply; The power interface is electrically connected to the switch module, the power interface is used to connect to an external power source, the battery is electrically connected to the switch module, and the switch module is electrically connected to the circuit unit capable of intermittent power supply; When the power interface is not connected to the external power source, the battery supplies power to the circuit unit that can be intermittently powered; when the power interface is connected to the external power source, the external power source supplies power to the circuit unit that can be intermittently powered through the switch module.

2. The ultrasonic fluid flow measurement instrument according to claim 1, characterized in that: The switch module includes a first power supply branch and a second power supply branch; One end of the first power supply branch is connected to the power interface, one end of the second power supply branch is electrically connected to the battery, the other end of the first power supply branch is electrically connected to the circuit unit that can be intermittently powered, the first power supply branch and the circuit unit that can be intermittently powered are conductive, the other end of the second power supply branch is connected to the circuit unit that can be intermittently powered, and the second power supply branch and the circuit unit that can be intermittently powered are conductive; When the power interface is not connected to the external power supply, the first power supply branch is not connected to the circuit unit capable of intermittent power supply, the second power supply branch is connected to the circuit unit capable of intermittent power supply, and the battery supplies power to the circuit unit capable of intermittent power supply through the second power supply branch; When the power interface is connected to the external power supply, the first power supply branch is connected to the circuit unit that can be intermittently powered, and the second power supply branch is not connected to the circuit unit that can be intermittently powered. The external power supply supplies power to the circuit unit that can be intermittently powered through the first power supply branch.

3. The ultrasonic fluid flow measurement instrument according to claim 2, characterized in that: The total circuit module also includes a circuit unit that requires continuous power supply; The battery is electrically connected to the circuit unit that needs continuous power supply, and the battery supplies power to the circuit unit that needs continuous power supply.

4. The ultrasonic fluid flow measurement instrument according to claim 2, characterized in that: The total circuit module also includes a circuit unit that requires continuous power supply; The power input terminal of the circuit unit requiring continuous power supply is electrically connected to the power input terminal of the circuit unit capable of intermittent power supply; The other end of the first power supply branch is also electrically connected to the circuit unit that needs continuous power supply, the first power supply branch and the circuit unit that needs continuous power supply are conductive, and the second power supply branch and the circuit unit that needs continuous power supply are conductive; When the power interface is not connected to the external power supply, the first power supply branch is not connected to the circuit unit that needs continuous power supply, the second power supply branch is connected to the circuit unit that needs continuous power supply, and the battery supplies power to the circuit unit that needs continuous power supply through the second power supply branch; When the power interface is connected to the external power supply, the first power supply branch is connected to the circuit unit that needs continuous power supply, and the second power supply branch is not connected to the circuit unit that needs continuous power supply. The external power supply supplies power to the circuit unit that needs continuous power supply through the first power supply branch.

5. The ultrasonic fluid flow measurement instrument according to claim 2, characterized in that: The first power supply branch includes a first control switch, and the second power supply branch includes a second control switch; The first end of the first control switch is electrically connected to the power interface, the first end of the second control switch is electrically connected to the battery, the second end of the first control switch is electrically connected to the second end of the second control switch, and the second end of the first control switch is electrically connected to the circuit unit capable of intermittent power supply; When the power interface is not connected to the external power supply, the first control switch is not turned on, and the second control switch is turned on, so that the second power supply branch is connected to the circuit unit capable of intermittent power supply, and the battery supplies power to the circuit unit capable of intermittent power supply through the second control switch; When the power interface is connected to the external power supply, the first control switch is turned on and the second control switch is not turned on, so that there is no conduction between the second power supply branch and the circuit unit that can be intermittently powered, and the external power supply supplies power to the circuit unit that can be intermittently powered through the first control switch.

6. The ultrasonic fluid flow measurement instrument according to claim 3, characterized in that: The first power supply branch includes a first control switch, and the second power supply branch includes a second control switch; The first end of the first control switch is electrically connected to the power interface, the first end of the second control switch is electrically connected to the battery, the second end of the first control switch is electrically connected to the second end of the second control switch, and the second end of the first control switch is electrically connected to the circuit unit capable of intermittent power supply, and the battery is electrically connected to the circuit unit requiring continuous power supply; When the power interface is not connected to the external power supply, the first control switch is not turned on, and the second control switch is turned on, so that the second power supply branch is connected to the circuit unit that can be intermittently powered, and the battery supplies power to the circuit unit that can be intermittently powered through the second control switch, and the battery supplies power to the circuit unit that needs continuous power supply; When the power interface is connected to the external power supply, the first control switch is turned on and the second control switch is not turned on, so that the second power supply branch and the circuit unit that can be intermittently powered are not conductive, and the external power supply supplies power to the circuit unit that can be intermittently powered through the first control switch, and the battery supplies power to the circuit unit that requires continuous power supply.

7. The ultrasonic fluid flow measurement instrument according to claim 5 or 6, characterized in that: The ultrasonic fluid flow measurement instrument also includes a control module; The control module is electrically connected to the first control switch and the second control switch respectively, and is used to control the first control switch and the second control switch so that the first control switch and the second control switch are switched between a conducting state and a non-conducting state.

8. The ultrasonic fluid flow measurement instrument according to claim 7, characterized in that: The first control switch is a diode, the second control switch is a MOS tube, and the control module includes a first resistor and a buffer; The second end of the first resistor is grounded, and the first end of the first resistor is electrically connected to the power interface, the buffer, and the diode; The first end of the buffer is electrically connected to the power interface, the diode and the first resistor respectively; the second end of the buffer is electrically connected to the MOS tube.

9. The ultrasonic fluid flow measurement instrument according to claim 7, characterized in that: The first control switch and the second control switch are both MOS tubes, and the control module includes a second resistor, a third resistor, an inverter and a buffer; The output end of the inverter is electrically connected to the MOS tube corresponding to the first control switch, the input end of the inverter is electrically connected to the input end of the buffer, and the output end of the buffer is electrically connected to the MOS tube corresponding to the second control switch; The first end of the second resistor is electrically connected to the MOS tube corresponding to the first control switch and is electrically connected to the power interface, the second end of the second resistor is electrically connected to the first end of the third resistor, the second end of the third resistor is grounded, and the connection point where the input end of the inverter is electrically connected to the input end of the buffer is electrically connected to the second end of the second resistor.

10. The ultrasonic fluid flow measurement instrument according to claim 6, characterized in that: The ultrasonic fluid flow measurement instrument further includes a first capacitor, a first end of which is electrically connected to the electrical connection between the battery and the circuit unit requiring continuous power supply, and a second end of the first capacitor is grounded.

11. The ultrasonic fluid flow measurement instrument according to claim 10, characterized in that: The ultrasonic fluid flow measurement instrument further includes a second capacitor, a first end of the second capacitor is electrically connected to a second end of the second control switch, and a second end of the second capacitor is grounded.

12. The ultrasonic fluid flow measurement instrument according to claim 5, characterized in that: The ultrasonic fluid flow measurement instrument further includes a third capacitor, a first end of the third capacitor is electrically connected to the second end of the second control switch, and a second end of the third capacitor is grounded.

13. The ultrasonic fluid flow measurement instrument according to claim 12, characterized in that: The ultrasonic fluid flow measurement instrument also includes a fourth capacitor, a first end of the fourth capacitor is electrically connected to the circuit unit that can be intermittently powered, and a first end of the fourth capacitor is electrically connected to the second end of the second control switch, a second end of the fourth capacitor is grounded, and the fourth capacitor is connected in parallel with the third capacitor.

14. The ultrasonic fluid flow measurement instrument according to claim 3, characterized in that: The ultrasonic fluid flow measurement instrument further comprises a plug-in structure, a plug-in hole is arranged on the plug-in structure, the first power supply branch comprises a first terminal, the second power supply branch comprises a second terminal, the first terminal and the second terminal are both arranged in the plug-in hole, a reed is further arranged in the plug-in hole, and the plug-in hole forms the power interface; The first terminal and the second terminal are spaced apart, one end of the spring is connected to the first terminal, the other end of the spring is movable relative to the plug hole, and the other end of the spring can be switched between a first position and a second position, the battery is electrically connected to the second terminal, the first terminal is electrically connected to the circuit unit capable of intermittent power supply, and the battery is electrically connected to the circuit unit requiring continuous power supply; When the power interface is not connected to the external power supply, the other end of the reed is located at the first position, and the other end of the reed is in contact with the second terminal, the first terminal and the second terminal are conductive, so that the second power supply branch is conductive to the circuit unit that can be intermittently powered, the battery supplies power to the circuit unit that can be intermittently powered through the reed, the first terminal and the second terminal, and the battery directly supplies power to the circuit unit that needs continuous power supply; when the power interface is connected to the external power supply, the external power supply abuts the reed, the other end of the reed is located at the second position, and the other end of the reed is separated from the second terminal, there is no conductivity between the first terminal and the second terminal, so that there is no conductivity between the second power supply branch and the circuit unit that can be intermittently powered, the external power supply is electrically connected to the first terminal through the reed to form a conductive first power supply branch, the external power supply supplies power to the circuit unit that can be intermittently powered through the reed and the first terminal, and the battery directly supplies power to the circuit unit that needs continuous power supply.

15. The ultrasonic fluid flow measurement instrument according to claim 14, characterized in that: The ultrasonic fluid flow measurement instrument further includes a fifth capacitor; A first end of the fifth capacitor is electrically connected to the first terminal, and a second end of the fifth capacitor is grounded.

16. The ultrasonic fluid flow measurement instrument according to claim 15, characterized in that: The ultrasonic fluid flow measurement instrument further includes a sixth capacitor; A first end of the sixth capacitor is electrically connected to the battery, and a second end of the sixth capacitor is grounded.

17. The ultrasonic fluid flow measurement instrument according to claim 2 or 4, characterized in that: The ultrasonic fluid flow measurement instrument further comprises a plug-in structure, a plug-in hole is arranged on the plug-in structure, the first power supply branch comprises a first terminal, the second power supply branch comprises a second terminal, the first terminal and the second terminal are both arranged in the plug-in hole, a reed is further arranged in the plug-in hole, and the plug-in hole forms the power interface; The first terminal and the second terminal are spaced apart, one end of the reed is connected to the first terminal, the other end of the reed is movable relative to the plug hole, and the other end of the reed can be switched between a first position and a second position, the battery is electrically connected to the second terminal, and the first terminal is electrically connected to the circuit unit capable of intermittent power supply; When the power interface is not connected to the external power source, the other end of the reed is located at the first position, and the other end of the reed is in contact with the second terminal, the first terminal is connected to the second terminal, so that the second power supply branch is connected to the circuit unit capable of intermittent power supply, and the battery supplies power to the circuit unit capable of intermittent power supply through the reed, the first terminal and the second terminal; When the power interface is connected to the external power supply, the external power supply abuts against the reed, the other end of the reed is located at the second position, and the other end of the reed is separated from the second terminal, and there is no conduction between the first terminal and the second terminal, so that there is no conduction between the second power supply branch and the circuit unit that can be intermittently powered, and the external power supply supplies power to the circuit unit that can be intermittently powered through the reed and the first terminal.

18. The ultrasonic fluid flow measurement instrument according to claim 17, characterized in that: The ultrasonic fluid flow measurement instrument also includes a seventh capacitor; A first end of the seventh capacitor is electrically connected to the battery, and a second end of the seventh capacitor is grounded.

19. The ultrasonic fluid flow measurement instrument according to claim 18, characterized in that: The ultrasonic fluid flow measurement instrument also includes an eighth capacitor; A first end of the eighth capacitor is electrically connected to the circuit unit capable of intermittent power supply and the first terminal, and a second end of the eighth capacitor is grounded.

20. The ultrasonic fluid flow measurement instrument according to claim 1, characterized in that: The ultrasonic fluid flow meter also includes a housing and a circuit board; The battery, the main circuit module, the switch module, the transducer, the measuring tube and the circuit board are all arranged in the shell, and the main circuit module and the switch module are integrated on the circuit board, and the power interface is arranged on the shell or on the circuit board.

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