Envelope detection type non-magnetic remote water meter

Abstract

The utility model discloses an envelope detection type non-magnetic remote water meter which comprises a water meter base meter and a sampling sensing module, the water meter base meter comprises an impeller and a dial rotor, the impeller is connected with the dial rotor, the dial rotor is divided into a metal area and a non-metal area, the metal area and the non-metal area are respectively provided with a probe, and the sampling sensing module is connected with the water meter base meter. Each probe is connected with a sampling sensing module; the sampling sensing module comprises a three-point LC oscillating circuit, an integrating circuit, an envelope detection circuit and a push-pull output circuit which are connected in sequence; wherein the envelope detection circuit comprises a first-stage triode and a second-stage triode, the first-stage triode is connected with the output end of the integrating circuit, the second-stage triode is connected with the input end of the push-pull output circuit, and an acceleration capacitor and an acceleration resistor are arranged between the first-stage triode and the second-stage triode. The water meter does not need a processor and can output standard and stable pulse square waves, and the accuracy, reliability and applicability of the water meter are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of water meter equipment, and in particular relates to an envelope detection type non-magnetic remote transmission water meter. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Most traditional non-magnetic water meters use the magnetic sampling principle to sample flow, and then rely on built-in processors for data processing and transmission. Although this method avoids the problem of magnetic components being easily interfered by the outside world to a certain extent, the weak front-end signal may still be affected by environmental factors (such as electromagnetic interference, temperature and humidity, etc.), resulting in inaccurate measurement or frequent failures. At the same time, the processor also brings additional power consumption and shortens the battery life. In addition, fragile electronic components such as processors may be damaged in extreme environments (such as high temperature and high humidity environments), resulting in inaccurate measurement. Moreover, some special fields have strict restrictions on the software application of processors. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the above-mentioned prior art, and to provide an envelope detection type non-magnetic remote transmission water meter, which uses a hardware circuit to replace the processor module to achieve non-magnetic detection, and adopts a dual-probe envelope detection technology, which significantly improves the signal-to-noise ratio and measurement accuracy of the signal. At the same time, through precise signal processing, accurate water flow pulse counting is achieved without a processor, reducing system complexity and cost. Moreover, the processor-free design is more adaptable to extreme use environments and some specific fields, with stronger reliability and better applicability, while greatly reducing the power consumption of the water meter, and reducing maintenance costs and difficulties.

[0005] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] The technical solution of the utility model provides an envelope detection type non-magnetic remote transmission water meter, comprising: a water meter base meter and a sampling sensor module, the water meter base meter comprises an impeller and a dial rotor, the impeller is connected to the dial rotor, the dial rotor is divided into a metal area and a non-metal area, the metal area and the non-metal area are respectively provided with a probe, and each probe is connected to a sampling sensor module;

[0007] The sampling sensing module includes a three-point LC oscillation circuit, an integration circuit, an envelope detection circuit and a push-pull output circuit connected in sequence; wherein the envelope detection circuit includes a first-stage triode and a second-stage triode, the first-stage triode is connected to the output end of the integration circuit, the second-stage triode is connected to the input end of the push-pull output circuit, and an acceleration capacitor and an acceleration resistor are arranged between the first-stage triode and the second-stage triode.

[0008] In at least one embodiment, the envelope detection circuit specifically includes a first branch and a second branch connected in parallel, the first branch includes a first-stage triode and an acceleration capacitor connected in series, and the second branch includes a second-stage triode and an acceleration resistor connected in series; the base of the first-stage triode is connected to the output end of the integration circuit, the collector of the second-stage triode is connected to the input end of the push-pull output circuit, and the emitter of the first-stage triode is connected to the emitter of the second-stage triode.

[0009] In at least one embodiment, a first-order low-pass filter circuit is provided between the output end of the envelope detection circuit and the input end of the push-pull output circuit.

[0010] In at least one embodiment, the first-order low-pass filter circuit includes a ninth resistor and a twenty-eighth capacitor connected in series; the first-order low-pass filter circuit is connected in parallel at both ends of the series branch of the second-stage transistor and the acceleration resistor; the collector of the second-stage transistor is connected in series with the ninth resistor and then connected to the input end of the push-pull output circuit.

[0011] In at least one embodiment, the push-pull output circuit includes a third branch and a fourth branch connected in parallel; the third branch includes a second triode; the fourth branch includes a first triode and a sixth triode connected in series;

[0012] Among them, the collector of the second triode is connected in series with the sixth resistor and then connected to the base of the first triode; the emitter of the second triode is connected to the base of the sixth triode; the twenty-fifth capacitor is also connected in parallel between the two ends of the sixth triode; the collector of the sixth triode is connected in series with the thirty-eighth resistor and then connected to the output end.

[0013] In at least one embodiment, the integration circuit is composed of an equivalent internal resistance of a first-stage transistor front-end circuit of an envelope detection circuit and an acceleration capacitor.

[0014] In at least one embodiment, the impeller is connected to the dial rotor through a transmission mechanism to drive the dial rotor to rotate.

[0015] In at least one embodiment, a mechanical character wheel is further included, and the mechanical character wheel is connected to the impeller through a transmission mechanism.

[0016] In at least one embodiment, an embedded antenna is also built-in; the embedded antenna adopts FPC material and has an additional metal shielding layer; and a filter is also connected to the antenna feed end.

[0017] In at least one embodiment, a remote transmission module is also built-in; the input end of the remote transmission module is connected to the output end of the sampling sensor module, and the output end is connected to the input end of the embedded antenna.

[0018] The beneficial effects of the technical solution of the utility model are as follows:

[0019] 1) The utility model uses an envelope detection type non-magnetic remote water meter to replace the processor module with a hardware circuit. The standard sine wave generated by a three-point LC oscillation circuit is used as a carrier wave, and the impeller rotation signal is used as a modulation signal. The two are combined to generate a frequency modulated wave. The frequency modulated signal is converted into a frequency modulated amplitude modulated signal through an integration circuit. Subsequently, the envelope of this signal is accurately amplitude-detected through an envelope detection circuit to extract an amplitude signal reflecting the flow rate information. Finally, the amplitude signal is converted into a pulse square wave signal for stable output through a push-pull output circuit.

[0020] 2) The utility model improves the sampling sensor module circuit by an envelope detection type non-magnetic remote water meter. By adding an acceleration capacitor and an acceleration resistor between the two-stage transistors in the envelope detection circuit, the voltage fluctuation of the emitters of the two-stage transistors can be reduced, the circuit hysteresis can be reduced, the two-stage transistor switches can be faster, and the switching between the bistable states can be accelerated; at the same time, by setting the acceleration capacitor, it can also play the role of amplitude detection and realize the envelope detection effect.

[0021] 3) In the envelope detection type non-magnetic remote water meter of the utility model, a first-order low-pass filter circuit is arranged between the envelope detection circuit and the push-pull push circuit, which can filter out high-frequency carrier components, eliminate interference and other glitches, and make the output waveform become a square wave.

[0022] 4) The envelope detection type non-magnetic remote water meter of the utility model adopts dual-probe envelope detection technology. Through the simultaneous operation of the dual probes, it realizes the comprehensive capture and accurate demodulation of complex signals, effectively solving the limitations of traditional non-magnetic sampling technology in signal capture. The dual probes can verify each other, and through the envelope detection circuit, the noise signal is eliminated and the real eddy current signal is retained, which significantly improves the signal-to-noise ratio and measurement accuracy of the signal. In addition, through precise signal processing, accurate water flow pulse counting is achieved without a processor, reducing system complexity and cost.

[0023] 5) The envelope detection type non-magnetic remote water meter of the utility model does not have vulnerable electronic components such as processors, which reduces potential failure points. The electronic components used have stronger adaptability to environmental factors such as temperature and humidity, reducing the problem of inaccurate measurement caused by component aging. At the same time, it can be applied to special fields with strict restrictions on processor software, with higher reliability and wider application range. In addition, the processor-free design greatly reduces the power consumption of the water meter, reducing maintenance costs and difficulties.

[0024] 6) The envelope detection type non-magnetic remote transmission water meter of the utility model can accurately measure water consumption, support remote meter reading and network recharge, and improve the convenience and accuracy of water management. In addition, the water meter also has intelligent functions such as remote control and fault detection, which provides strong support for the construction of smart cities. It plays an important role in the fields of residential water management, industrial water monitoring, etc., and helps to promote the rational allocation and effective use of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0026] Figure 1 This is a schematic diagram of the structure of an envelope detection type non-magnetic remote transmission water meter of the utility model;

[0027] Figure 2 This is a schematic diagram of a sampling sensor module of an envelope detection type non-magnetic remote transmission water meter of the utility model;

[0028] Figure 3 This is a schematic diagram comparing the output pulses before and after the improvement of the sampling sensor module circuit.

[0029] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0030] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0031] As introduced in the background technology, the purpose of the utility model is to overcome the deficiencies existing in the above-mentioned prior art, and to provide an envelope detection type non-magnetic remote water meter, which uses hardware circuits instead of processor modules to achieve non-magnetic detection, and adopts dual-probe envelope detection technology, which significantly improves the signal-to-noise ratio and measurement accuracy of the signal. At the same time, through precise signal processing, accurate water flow pulse counting is achieved without a processor, reducing system complexity and cost. Moreover, the processor-free design is more adaptable to extreme use environments and some specific fields, with stronger reliability and better applicability, while greatly reducing the power consumption of the water meter, and reducing maintenance costs and difficulties.

[0032] Example 1

[0033] In a typical implementation of the utility model, the embodiment discloses an envelope detection type non-magnetic remote transmission water meter, including: a water meter base meter and a sampling sensor module, the water meter base meter includes an impeller and a dial rotor, the impeller is connected to the dial rotor, the dial rotor is divided into a metal area and a non-metal area, the metal area and the non-metal area are respectively provided with a probe, and each probe is connected to a sampling sensor module;

[0034] The sampling sensing module includes a three-point LC oscillation circuit, an integration circuit, an envelope detection circuit and a push-pull output circuit connected in sequence; wherein the envelope detection circuit includes a first-stage transistor Q5 and a second-stage transistor Q3, the first-stage transistor Q5 is connected to the output end of the integration circuit, the second-stage transistor Q3 is connected to the input end of the push-pull output circuit, and an acceleration capacitor C27 and an acceleration resistor R41 are arranged between the first-stage transistor Q5 and the second-stage transistor Q3.

[0035] In this embodiment, the sampling sensor module is based on the transformation of the Schmidt circuit, and is composed of an envelope detection part and a low-pass filtering part.

[0036] The envelope detection part is specifically an envelope detection circuit, and its main function is to complete the conversion from frequency to amplitude, that is, the conversion from a sine wave to a high or low level. In this embodiment, the envelope detection circuit includes a first branch and a second branch connected in parallel, the first branch includes a first-stage triode Q5 and an acceleration capacitor C27 connected in series, and the second branch includes a second-stage triode Q3 and an acceleration resistor R41 connected in series; the base of the first-stage triode Q5 is connected to the output end of the integration circuit, the collector of the second-stage triode Q3 is connected to the input end of the push-pull output circuit, and the emitter of the first-stage triode Q5 is connected to the emitter of the second-stage triode Q3.

[0037] like Figure 2As shown, the first branch is a series branch formed by the seventh resistor R7, the collector and emitter of the first-stage triode Q5, and the acceleration capacitor C27 connected in sequence, and the second branch is a series branch formed by the fifth resistor R5, the collector and emitter of the second-stage triode Q3, and the acceleration resistor R41 connected in sequence. The collector of the first-stage triode Q5 is connected in series with the twentieth capacitor C20 and then connected to the base of the second-stage triode Q3, and the eighth resistor R8 is connected in parallel at both ends of the twentieth capacitor C20; the emitter of the first-stage triode Q5 is connected to the emitter of the second-stage triode Q3. The series branch of the fifteenth resistor R15 and the twenty-fourth capacitor C24 is also connected in parallel at both ends of the series branch of the first-stage triode Q5 and the twenty-seventh capacitor C27.

[0038] The envelope detection part has two stable states, namely, Q5 is saturated and Q3 is cut off, and Q5 is cut off and Q3 is saturated. The acceleration capacitor C27 and the acceleration resistor R41 can speed up the switching between the bistable states, and the acceleration capacitor C27 plays the role of amplitude detection. The RC loop composed of the acceleration capacitor C27 and the acceleration resistor R41 has a large time constant, which can reduce the emitter voltage fluctuation of the first-stage transistor Q5 and the second-stage transistor Q3, and reduce the circuit hysteresis, making the transistor switch faster.

[0039] The low-pass filter part is a first-order low-pass filter circuit arranged between the output end of the envelope detection circuit and the input end of the push-pull output circuit. The circuit is connected in parallel to the two ends of the series branch of the second-stage transistor Q3 and the acceleration resistor R41, specifically the series branch composed of the ninth resistor R9 and the twenty-eighth capacitor C28, which can filter out high-frequency carrier components, eliminate interference and other burrs, and make the output waveform become a square wave. When the envelope detection circuit is connected to the push-pull output circuit, the collector of the second-stage transistor Q3 of the envelope detection circuit is connected in series with the ninth resistor R9 and then connected to the input end of the push-pull output circuit.

[0040] The push-pull output circuit includes a third branch and a fourth branch connected in parallel: the third branch includes the second triode Q2, and the fourth branch includes the first triode Q1 and the sixth triode Q6 connected in series. The collector of the second triode Q2 is connected in series with the sixth resistor R6 and then connected to the base of the first triode Q1; the emitter of the second triode Q2 is connected to the base of the sixth triode Q6. Figure 2As shown, the third branch is a series branch formed by the second resistor R2, the collector and emitter of the second triode Q2, and the fortieth resistor R40 connected in sequence; the fourth branch is a series branch formed by the first resistor R1, the collector and emitter of the first triode Q1, the thirty-seventh resistor R37, and the collector and emitter of the sixth triode Q6 connected in sequence. The collector of the second triode Q2 is connected in series with the sixth resistor R6 and then connected to the base of the first triode Q1, and the emitter of the second triode Q2 is connected to the base of the sixth triode Q6. The base of the second triode Q2 is connected to the low voltage end of the ninth resistor R9, the twenty-fifth capacitor C25 is connected in parallel between the collector and emitter of the sixth triode Q6, and the collector of the sixth triode Q6 is connected in series with the thirty-eighth resistor R38 and then connected to the output end.

[0041] The push-pull output circuit is actually an inverted push-pull circuit, and the inverted signal is used as the input signal of the push-pull circuit. The push-pull circuit consists of two power switch tubes with the same parameters - the first transistor Q1 and the sixth transistor Q6, which work in a push-pull mode, that is, when one tube pushes out, the other tube pulls back and turns on alternately. This working mode enables the circuit to efficiently amplify the waveform of the positive and negative half cycles, thereby improving the circuit's load capacity and switching speed.

[0042] The signal filtered by the first-order low-pass filter circuit is output through the phase inversion stage and the push-pull type to improve the driving ability of the circuit. At the same time, the first transistor Q1 and the sixth transistor Q6 of the push-pull type output circuit will not be turned on at the same time, and there is no short-circuit current caused by simultaneous conduction, which can effectively reduce power consumption. Moreover, the push-pull type output circuit can reduce the sudden change of voltage and current in the circuit, thereby reducing radiation and conduction interference, and can effectively reduce electromagnetic interference.

[0043] In the selection of the oscillation circuit for generating the waveform, the present embodiment selects a three-point LC oscillation circuit whose output oscillation waveform is closer to a sine wave, which includes a fifth branch and a sixth branch connected in parallel: the fifth branch includes a fourth transistor Q4 and an inductor L1 connected in series, and the sixth branch includes a twenty-second capacitor C22 and a twenty-sixth capacitor C26 connected in series. Among them, the base of the fourth transistor Q4 and both ends of the inductor L1 are connected in series with a twenty-third capacitor C23, and both ends of the fifth branch are also connected in parallel with a twenty-first capacitor C21, the collector of the fourth transistor Q4 is connected to the base of the first-stage transistor Q5; the low-voltage end of the twenty-second capacitor C22 is connected to the base of the first-stage transistor Q5. Figure 2As shown, the fifth branch is specifically a series branch composed of the fourth resistor R4, the emitter and collector of the fourth transistor Q4, and the inductor L1 connected in sequence, and the sixth branch composed of the twenty-second capacitor C22 and the twenty-sixth capacitor C26 connected in series is connected in parallel between the two ends of the fourth transistor Q4. The fifteenth collector of the fourth transistor Q4 is connected to the low-voltage end of the twenty-second capacitor and then connected in series with the twenty-fourth capacitor and the base of the first-stage transistor Q5. The twenty-first capacitor C21 is also connected in parallel at both ends of the fifth series branch, and together with the twenty-second capacitor C22 and the inductor L1, it forms three points in the three-point LC oscillation circuit. At the same time, the third resistor R3 is connected in parallel at both ends of the series branch of the third resistor R3 and the base of the fourth transistor Q4, and the twenty-third capacitor C23 and the thirty-ninth resistor R39 are respectively connected in parallel at both ends of the series branch of the base of the fourth transistor Q4 and the inductor L1. The waveform generated based on the three-point LC oscillation circuit is close to a standard sine wave, has high high-frequency stability, and high waveform quality, so the circuit has high frequency stability and a larger operating frequency range.

[0044] The integration circuit is composed of the equivalent internal resistance of the front-end circuit of the first-stage transistor Q5 of the envelope detection circuit and the acceleration capacitor C27. Its output end is connected to the base of the first-stage transistor Q5, so as to convert the frequency change in the FM signal into amplitude change to form an FM amplitude modulation signal and transmit the FM amplitude modulation signal to the envelope detection circuit for accurate amplitude detection processing.

[0045] In this embodiment, the fourth transistor Q4 in the three-point LC oscillation circuit is a PNP transistor, and the other transistors are NPN transistors.

[0046] In this embodiment, the impeller of the water meter is connected to the dial rotor through a transmission mechanism. Under the impetus of the water flow, the impeller starts to rotate, and the dial rotor is driven to rotate synchronously through the transmission mechanism.

[0047] In this embodiment, the water meter further includes a mechanical character wheel, and the flow rate is displayed by the mechanical character wheel group. The mechanical character wheel is connected to the impeller through a transmission mechanism. When the impeller of the water meter is driven by the water flow and rotates, the mechanical character wheel group is driven to rotate through the mechanical transmission structure, and the flow rate is displayed by 8 character wheels (each character wheel includes numbers 0 to 9). The flow rate display can be realized without setting an electrical display component, and thus no additional processor is required to control the display.

[0048] The utility model discloses an envelope detection type non-magnetic remote transmission water meter, which includes an impeller and a dial rotor. The dial rotor is divided into a metal area and a non-metal area. A probe is respectively arranged in the metal area and the non-metal area, and each probe is connected to a sampling sensor module. When the water flow drives the water meter impeller to rotate, the impeller drives the dial rotor to rotate synchronously. When the rotor rotates, the metal area and the inductor coil in the three-point LC oscillation circuit generate an eddy current effect. Compared with the non-metal area, the sine wave generated by the three-point LC oscillation circuit decays faster. The sampling sensor module of the water meter uses the standard sine wave generated by the three-point LC oscillation circuit as a carrier. When the impeller rotates, its rotation signal is used as a modulation signal. The two are combined to generate a frequency modulation wave through frequency modulation. The integral circuit converts the frequency change in the frequency modulation signal into an amplitude change to form a frequency modulation amplitude modulation signal. Subsequently, the envelope of the signal is accurately detected by the envelope detection circuit to extract the amplitude signal reflecting the flow rate information. Finally, the amplitude signal is converted into a pulse square wave signal for stable output through a push-pull output circuit.

[0049] like Figure 3 As shown in the figure, before the sampling sensor module circuit is improved, the output pulse signal is a low-frequency pulse signal with a low-amplitude high-frequency signal parasitic on it, and the pulse amplitude fluctuates irregularly, which easily leads to miscount pulses. After the sampling sensor circuit is improved, the output pulse signal is a stable and standard square wave pulse, which can ensure more accurate water flow pulse counting.

[0050] In addition, the envelope detection type non-magnetic remote transmission water meter of the utility model uses a pure hardware circuit to replace the processor module. The electronic components used have stronger adaptability to environmental factors such as temperature and humidity, stronger stability, and a wider range of applications. At the same time, it also reduces the problem of inaccurate measurement caused by damage to components by external factors. Compared with the processor, the pure hardware circuit is more adaptable to extreme use environments. Moreover, in some special fields (such as the nuclear power field), the participation of software in the processor will bring additional instability risks, which may lead to a reduction in the reliability of the overall equipment. Therefore, some specific factories do not allow the use of equipment with software, and some require that the equipment software must rely on software V&V to improve its quality. The water meter does not have a processor, which can improve the reliability of the water meter and can be applied to some special fields. It has a wider range of applications and stronger applicability.

[0051] The water meter of this embodiment adopts dual-probe envelope detection technology. The two probes on the dial rotor work simultaneously, which enhances the comprehensiveness and accuracy of signal capture. Moreover, the output signal of one probe is added as a feedback signal to the input end of another probe to achieve mutual verification of the two probes. The nonlinear distortion of the output waveform can be reduced and noise can be suppressed by negative feedback. When faced with complex signals, the demodulation and detection capabilities of the dual-probe envelope detection technology can accurately eliminate the interference of noise signals and ensure the complete retention of the real eddy current signal. The flow signal of this water meter processed by the dual-probe envelope detection technology can achieve accurate water flow pulse counting even without a processor. This feature not only simplifies the complexity of the system and reduces costs, but also improves the response speed and real-time performance of the system.

[0052] The water meter of this embodiment reduces the nonlinear distortion of the output waveform and suppresses noise by means of double-probe negative feedback on the one hand, and processes it by means of an optimized sampling sensor circuit on the other hand: first, adding an acceleration capacitor and an acceleration resistor between the two-stage triodes of the envelope detection circuit accelerates the switching between the bistable states, which can reduce the voltage fluctuation of the emitter of the two-stage triodes and reduce the circuit hysteresis. At the same time, the design of the acceleration capacitor can also realize the envelope amplitude discrimination; secondly, a first-order low-pass filter circuit is set between the envelope detection circuit and the push-pull output circuit, which can filter out the high-frequency carrier component, eliminate interference and other glitches, and make the output waveform a square wave; finally, the push-pull output current is used to reduce the sudden change of voltage and current in the circuit, reduce the interference of radiation and conduction, and make the output pulse signal a standard square wave pulse signal. In this way, the demodulation and detection capabilities of the double-probe envelope detection technology can accurately eliminate the interference of noise signals and ensure the complete retention of the real eddy current signal.

[0053] In this embodiment, the water meter is also equipped with an embedded antenna, using FPC material with excellent conductivity and shielding effect, and adding a metal shielding layer to reduce the impact of external electromagnetic fields on antenna performance, and adding a filter at the antenna feed end to suppress interference signals. The position and direction of the antenna are optimized through electromagnetic simulation software to ensure that the antenna has good anti-interference performance and stable signal transmission quality in a complex electromagnetic environment.

[0054] The use of embedded antennas does not require external antenna components, which not only significantly improves the overall aesthetics and compactness of the water meter, but also ensures high stability and reliability of data transmission. Through antenna layout design and electromagnetic shielding strategies, embedded antennas can effectively resist interference from external environmental factors, such as electromagnetic noise, temperature and humidity changes, and physical damage, thereby significantly extending the service life and maintenance cycle of the water meter.

[0055] In this embodiment, the water meter is also equipped with a remote transmission module, whose input end is connected to the output end of the sampling sensor module, and the output end is connected to the input end of the embedded antenna. It can receive the square wave pulse signal output by the push-pull output circuit of the sampling sensor module, and generate flow information after data processing of the signal. After being compressed by the packaging box, the flow information is efficiently and securely transmitted to the embedded antenna for remote transmission, thereby improving the convenience and accuracy of water use management.

[0056] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An envelope detection type non-magnetic remote water meter, characterized in that: include: A water meter base meter and a sampling sensor module, wherein the water meter base meter comprises an impeller and a dial rotor, wherein the impeller is connected to the dial rotor, and the dial rotor is divided into a metal area and a non-metal area, wherein a probe is respectively arranged in the metal area and the non-metal area, and each probe is connected to a sampling sensor module; The sampling sensing module includes a three-point LC oscillation circuit, an integration circuit, an envelope detection circuit and a push-pull output circuit connected in sequence; wherein the envelope detection circuit includes a first-stage triode and a second-stage triode, the first-stage triode is connected to the output end of the integration circuit, the second-stage triode is connected to the input end of the push-pull output circuit, and an acceleration capacitor and an acceleration resistor are arranged between the first-stage triode and the second-stage triode.

2. An envelope detection type non-magnetic remote water meter as claimed in claim 1, characterized in that: The envelope detection circuit specifically includes a first branch and a second branch connected in parallel with each other, the first branch includes a first-stage triode and an accelerating capacitor connected in series, and the second branch includes a second-stage triode and an accelerating resistor connected in series; the base of the first-stage triode is connected to the output end of the integrating circuit, the collector of the second-stage triode is connected to the input end of the push-pull output circuit, and the emitter of the first-stage triode is connected to the emitter of the second-stage triode.

3. The envelope detection type non-magnetic remote transmission water meter according to claim 1, characterized in that: A first-order low-pass filter circuit is arranged between the output end of the envelope detection circuit and the input end of the push-pull output circuit.

4. An envelope detection type non-magnetic remote water meter as claimed in claim 3, characterized in that: The first-order low-pass filter circuit includes a ninth resistor and a twenty-eighth capacitor connected in series; the first-order low-pass filter circuit is connected in parallel to the two ends of the series branch of the second-stage triode and the acceleration resistor; the collector of the second-stage triode is connected in series with the ninth resistor and then connected to the input end of the push-pull output circuit.

5. The envelope detection type non-magnetic remote transmission water meter as claimed in claim 3, characterized in that: The push-pull output circuit comprises a third branch and a fourth branch connected in parallel with each other; the third branch comprises a second triode; the fourth branch comprises a first triode and a sixth triode connected in series; Among them, the collector of the second triode is connected in series with the sixth resistor and then connected to the base of the first triode; the emitter of the second triode is connected to the base of the sixth triode; the twenty-fifth capacitor is also connected in parallel between the two ends of the sixth triode; the collector of the sixth triode is connected in series with the thirty-eighth resistor and then connected to the output end.

6. An envelope detection type non-magnetic remote transmission water meter as claimed in claim 5, characterized in that: The integration circuit is composed of the equivalent internal resistance of the first-stage triode front-end circuit of the envelope detection circuit and the acceleration capacitor.

7. The envelope detection type non-magnetic remote transmission water meter according to claim 1, characterized in that: The impeller is connected to the dial rotor through a transmission mechanism to drive the dial rotor to rotate.

8. The envelope detection type non-magnetic remote transmission water meter according to claim 1, characterized in that: It also includes a mechanical character wheel, which is connected to the impeller through a transmission mechanism.

9. The envelope detection type non-magnetic remote transmission water meter according to claim 1, characterized in that: An embedded antenna is also built in; the embedded antenna adopts FPC material and has an additional metal shielding layer; a filter is also connected to the antenna feed end.

10. An envelope detection type non-magnetic remote transmission water meter as claimed in claim 9, characterized in that: A remote transmission module is also built in; the input end of the remote transmission module is connected to the output end of the sampling sensor module, and the output end is connected to the input end of the embedded antenna.

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