CN212658986U - Flow control alarm system - Google Patents
Flow control alarm system Download PDFInfo
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- CN212658986U CN212658986U CN202021233879.1U CN202021233879U CN212658986U CN 212658986 U CN212658986 U CN 212658986U CN 202021233879 U CN202021233879 U CN 202021233879U CN 212658986 U CN212658986 U CN 212658986U
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Abstract
The utility model provides a flow control alarm system, which forms a high integration device by integrating an excitation signal generating circuit and a signal processing circuit in a sensor, greatly shortens the distance between the excitation signal and a sensitive element, and avoids the interference in the transmission process; in addition, a signal processing circuit is integrated in the sensor, the capacitance change generated by the liquid level change is converted into a voltage signal, the voltage signal is preprocessed in the sensor probe to be converted into a digital signal and then transmitted, and the signal interference generated in the transmission process of the analog signal is greatly reduced.
Description
Technical Field
The utility model relates to a flow sensor field especially relates to a flow control alarm system.
Background
Flow control alarm systems are generally composed of a sensor, a transmission line (4-5 meters) and a control unit, which generates an excitation signal. However, the existing flow control alarm system has the following defects:
1) the excitation signal is susceptible to signal interference during transmission from the control unit to the sensor probe, resulting in instability of the excitation signal (manifested as amplitude and frequency variations), which is very likely to cause false alarms.
2) The capacitance change that the liquid level change produced is converted into voltage signal (analog signal), need pass to the control unit through the sensor probe, also can receive decay and interference in the transmission course, causes the unable state that really reflects the liquid level of signal that detects, and this can directly influence the precision of control unit subsequent processing, very easily causes the wrong report police.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings of the prior art, the present invention provides a flow control alarm system capable of suppressing signal interference.
In order to achieve the above object, the utility model provides a flow control alarm system, include: a control unit; a sensor unit in communication connection with the control unit; the sensor unit comprises a sensor probe and is integrated with an excitation signal generating circuit and/or a signal processing circuit; the excitation signal generating circuit is connected with the control unit and the sensor probe, generates an excitation signal and transmits the excitation signal to the sensor probe; the input end of the signal processing circuit is connected with the output end of the sensor probe, and the output end of the signal processing circuit is connected with the control unit and used for converting an analog signal detected by the sensor probe into a digital signal, processing the digital signal and transmitting the digital signal to the control unit.
In an alternative implementation of the present invention, in a case where the sensor unit is integrated with the excitation signal generating circuit and the signal processing circuit, the control unit includes: the power supply circuit is connected with an external signal and outputs a power supply to the excitation signal generating circuit; and the input end of the signal output circuit is connected with the output end of the signal processing circuit, and the output end outputs signals outwards.
In an alternative implementation manner of the present invention, in a case where the sensor unit is integrated with only the excitation signal generating circuit, the control unit includes: the power supply circuit is connected with an external signal and outputs a power supply to the excitation signal generating circuit; the input end of the signal processing circuit is connected with the output end of the sensor probe; and the input end of the signal output circuit is connected with the output end of the signal processing circuit, and the output end outputs signals outwards.
In an alternative implementation of the present invention, under the condition that the sensor unit is integrated with only the signal output circuit, the control unit includes: the power supply circuit is connected with an external signal; the input end of the excitation signal generating circuit is connected with the output end of the power supply circuit so as to receive a power supply signal; and the input end of the signal output circuit is connected with the output end of the signal processing circuit, and the output end outputs signals outwards.
In an optional implementation of the present invention, the power circuit includes: any one or combination of a plurality of voltage-stabilized power supply circuits, current-stabilized power supply circuits, inverter power supply circuits, DC-DC power supply circuits, protective power supply circuits or switch power supply circuits.
In an alternative implementation of the present invention, the signal processing circuit includes an analog-to-digital conversion circuit.
In an optional implementation manner of the present invention, the control unit includes: MCU controller, FPGA controller, SOC controller, DSP controller or ARM controller.
As described above, the utility model relates to a flow control alarm system has following beneficial effect: the utility model forms a high integration device by integrating the excitation signal generating circuit and the signal processing circuit in the sensor, greatly shortens the distance between the excitation signal and the sensitive element, and avoids the interference in the transmission process; in addition, a signal processing circuit is integrated in the sensor, the capacitance change generated by the liquid level change is converted into a voltage signal, the voltage signal is preprocessed in the sensor probe to be converted into a digital signal and then transmitted, and the signal interference generated in the transmission process of the analog signal is greatly reduced.
Drawings
Fig. 1 is a schematic structural diagram of a flow control alarm system in the prior art.
Fig. 2 is a schematic structural diagram of a flow control alarm system according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a flow control alarm system according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a flow control alarm system according to an embodiment of the present invention.
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. The following detailed description is not to be taken in a limiting sense, and the scope of embodiments of the present application is defined only by the claims of the issued patent. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Spatially relative terms, such as "upper," "lower," "left," "right," "lower," "below," "lower," "above," "upper," and the like, may be used herein to facilitate describing one element or feature's relationship to another element or feature as illustrated in the figures.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," "retained," and the like are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," and/or "comprising," when used in this specification, specify the presence of stated features, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, operations, elements, components, items, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions or operations are inherently mutually exclusive in some way.
Fig. 1 shows a schematic structural diagram of a flow control alarm system in the prior art. The flow control alarm system comprises a control unit 11, a sensor 12, a transmission line 13 and a transmission line 14; it should be understood that fig. 1 is a schematic diagram, the actual lengths of the transmission lines 13 and 14 are not limited to fig. 1, and the actual length of the transmission lines may reach 4-5 meters.
Specifically, the control unit 11 includes a power supply circuit 111, an excitation signal generation circuit 112, a signal processing circuit 113, and a signal output circuit 114. The power circuit 111 is used for processing power, and includes, but is not limited to, a regulated power circuit, an inverter power circuit, a DC-DC power circuit, a protection power circuit, or a switching power circuit; the excitation signal generating circuit 112 is used for generating an excitation signal, and includes, but is not limited to, a square wave generating circuit, a pulse signal generating circuit, etc.; the signal processing circuit 113 is used for performing analog-to-digital conversion on the received analog signal and then performing liquid level analysis processing; the signal output circuit 114 is used to output a signal.
As can be seen from fig. 1, the excitation signal generating circuit 112 in the control unit 11 generates an excitation signal, transmits the excitation signal to the sensor probe 121 in the sensor 12 through the transmission line 13, and detects a change in the liquid level to be measured through the sensor probe 121, where the change in the liquid level causes a change in the conductivity and thus a change in the capacitance, converts the change in the capacitance into a corresponding voltage signal, transmits the voltage signal to the signal processing circuit 113 through the transmission line 14, analyzes the state of the liquid level, and sends an alarm signal.
However, this detection method causes the following disadvantages: firstly, in the process that an excitation signal is transmitted to a sensor probe from an excitation signal generating circuit of a control unit through a transmission line, the excitation signal is easily interfered, and the excitation signal is unstable (amplitude and frequency change occurs), so that false alarm is easily caused; secondly, the capacitance change generated by the liquid level change can be converted into a voltage signal (namely an analog signal) which is transmitted to the control unit from the sensor probe through the transmission line, and the voltage signal can not really reflect the state of the liquid level due to signal attenuation and interference in the transmission process, so that the accuracy of subsequent processing of the control unit is influenced, and false alarm is easily generated.
In view of this, the utility model provides a novel flow control alarm system for solve the problem that prior art kind of signal received the interference. In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the technical solutions in the embodiments of the present invention are further described in detail through the following embodiments in combination with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting.
As shown in fig. 2, a schematic structural diagram of a flow control alarm system in an embodiment of the present invention is shown. The flow control alarm system provided by the embodiment comprises: a control unit 21 and a sensor unit 22; the control unit 21 is in communication connection with the sensor unit 22; the sensor unit 22 includes a sensor probe 221, and is integrated with an excitation signal generation circuit 222 and a signal processing circuit 223.
The control unit 21 includes a power supply circuit 211 and a signal output circuit 212; the power circuit 211 is used for processing power, and includes, but is not limited to, a regulated power circuit, an inverter power circuit, a DC-DC power circuit, a protection power circuit, or a switching power circuit; the signal output circuit 212 is used to transmit the signal to the outside.
In the present embodiment, the excitation signal generating circuit 222 integrated with the sensor unit 22 is used for generating an excitation signal, and includes, but is not limited to, a square wave generating circuit, a pulse signal generating circuit, and the like. The technical scheme of the embodiment greatly shortens the distance between the excitation signal and the sensitive element, and avoids the interference in the transmission process; however, in the prior art, the excitation signal can be transmitted to the sensor probe only through the transmission line of 4-5 meters, and the transmission process can experience serious signal interference, so that the embodiment well solves the problem of signal interference and avoids false alarm.
In the present embodiment, the signal processing circuit 223 integrated with the sensor unit 22 is used to convert the analog signal detected by the sensor probe into a digital signal for processing. That is, the technical solution of this embodiment converts the capacitance change generated by the liquid level change into a corresponding voltage signal, and the voltage signal is preprocessed in the sensor probe to be converted into a digital signal and then transmitted, so that signal interference and false alarm caused by transmitting an analog signal by a long-distance transmission line as in the prior art can be avoided.
It should be noted that, the present invention can integrate both the excitation signal generating circuit and the signal processing circuit in the sensor unit, and can also integrate only the excitation signal generating circuit in the sensor unit, or integrate only the signal processing circuit, and in fact, each technical solution can play a role in suppressing signal interference, and the following two technical solutions will be explained with reference to the drawings.
As shown in fig. 3, a schematic structural diagram of a flow control alarm system in an embodiment of the present invention is shown. The flow control alarm system provided by the embodiment comprises: a control unit 31 and a sensor unit 32; the control unit 31 is communicatively connected to the sensor unit 32. The control unit 31 includes a power supply circuit 311, a signal processing circuit 312, and a signal output circuit 313; the sensor unit 32 includes a sensor probe 321 and is integrated with an excitation signal generation circuit 322.
In the present embodiment, the excitation signal generating circuit 322 integrated with the sensor unit 32 is used for generating an excitation signal, and includes, but is not limited to, a square wave generating circuit, a pulse signal generating circuit, and the like. The technical scheme of the embodiment greatly shortens the distance between the excitation signal and the sensitive element, and avoids the interference in the transmission process; however, in the prior art, the excitation signal can be transmitted to the sensor probe only through the transmission line of 4-5 meters, and the transmission process can experience serious signal interference, so that the embodiment well solves the problem of signal interference and avoids false alarm.
As shown in fig. 4, a schematic structural diagram of a flow control alarm system in an embodiment of the present invention is shown. The flow control alarm system provided by the embodiment comprises: a control unit 41 and a sensor unit 42; the control unit 41 and the sensor unit 42 are communicatively connected. The control unit 41 includes a power supply circuit 411, an excitation signal generation circuit 412, and a signal output circuit 413; the sensor unit 42 includes a sensor probe 421 and is integrated with a signal processing circuit 422.
In the present embodiment, the signal processing circuit 422 integrated with the sensor unit 42 is used for converting the analog signal detected by the sensor probe into a digital signal for processing. That is, the technical solution of this embodiment converts the capacitance change generated by the liquid level change into a corresponding voltage signal, and the voltage signal is preprocessed in the sensor probe to be converted into a digital signal and then transmitted, so that signal interference and false alarm caused by transmitting an analog signal by a long-distance transmission line as in the prior art can be avoided.
To sum up, the flow control alarm system provided by the utility model forms a high integration device by integrating the excitation signal generating circuit and the signal processing circuit in the sensor, greatly shortens the distance between the excitation signal and the sensitive element, and avoids the interference in the transmission process; in addition, a signal processing circuit is integrated in the sensor, the capacitance change generated by the liquid level change is converted into a voltage signal, the voltage signal is preprocessed in the sensor probe to be converted into a digital signal and then transmitted, and the signal interference generated in the transmission process of the analog signal is greatly reduced. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A flow control alarm system, comprising:
a control unit;
a sensor unit in communication connection with the control unit; the sensor unit comprises a sensor probe and is integrated with an excitation signal generating circuit and/or a signal processing circuit;
the excitation signal generating circuit is connected with the control unit and the sensor probe, generates an excitation signal and transmits the excitation signal to the sensor probe; the input end of the signal processing circuit is connected with the output end of the sensor probe, and the output end of the signal processing circuit is connected with the control unit and used for converting an analog signal detected by the sensor probe into a digital signal, processing the digital signal and transmitting the digital signal to the control unit.
2. The flow control alarm system according to claim 1, wherein in the case where the sensor unit is integrated with an excitation signal generation circuit and a signal processing circuit, the control unit comprises:
the power supply circuit is connected with an external signal and outputs a power supply to the excitation signal generating circuit;
and the input end of the signal output circuit is connected with the output end of the signal processing circuit, and the output end outputs signals outwards.
3. The flow control alarm system according to claim 1, wherein in the case where the sensor unit is integrated with only an excitation signal generation circuit, the control unit includes:
the power supply circuit is connected with an external signal and outputs a power supply to the excitation signal generating circuit;
the input end of the signal processing circuit is connected with the output end of the sensor probe;
and the input end of the signal output circuit is connected with the output end of the signal processing circuit, and the output end outputs signals outwards.
4. The flow control alarm system according to claim 1, wherein in the case where the sensor unit is integrated with only a signal output circuit, the control unit includes:
the power supply circuit is connected with an external signal;
the input end of the excitation signal generating circuit is connected with the output end of the power supply circuit so as to receive a power supply signal;
and the input end of the signal output circuit is connected with the output end of the signal processing circuit, and the output end outputs signals outwards.
5. The flow control alarm system according to any one of claims 2 to 4, wherein the power supply circuit comprises: any one or combination of a plurality of voltage-stabilized power supply circuits, current-stabilized power supply circuits, inverter power supply circuits, DC-DC power supply circuits, protective power supply circuits or switch power supply circuits.
6. The flow control alarm system of claim 1, wherein the signal processing circuit comprises an analog-to-digital conversion circuit.
7. The flow control alarm system according to claim 1, wherein the control unit comprises: MCU controller, FPGA controller, SOC controller, DSP controller or ARM controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021233879.1U CN212658986U (en) | 2020-06-29 | 2020-06-29 | Flow control alarm system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021233879.1U CN212658986U (en) | 2020-06-29 | 2020-06-29 | Flow control alarm system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212658986U true CN212658986U (en) | 2021-03-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021233879.1U Active CN212658986U (en) | 2020-06-29 | 2020-06-29 | Flow control alarm system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212658986U (en) |
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2020
- 2020-06-29 CN CN202021233879.1U patent/CN212658986U/en active Active
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