WO2016197631A1 - 抗酸碱全金属流量温度传感器 - Google Patents

抗酸碱全金属流量温度传感器 Download PDF

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Publication number
WO2016197631A1
WO2016197631A1 PCT/CN2016/075205 CN2016075205W WO2016197631A1 WO 2016197631 A1 WO2016197631 A1 WO 2016197631A1 CN 2016075205 W CN2016075205 W CN 2016075205W WO 2016197631 A1 WO2016197631 A1 WO 2016197631A1
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WIPO (PCT)
Prior art keywords
circuit
output
flow
metal
temperature
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PCT/CN2016/075205
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English (en)
French (fr)
Inventor
陈怡因
Original Assignee
伊玛精密电子（苏州）有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 伊玛精密电子（苏州）有限公司 filed Critical 伊玛精密电子（苏州）有限公司
Priority to DE212016000001.2U priority Critical patent/DE212016000001U1/de
Publication of WO2016197631A1 publication Critical patent/WO2016197631A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass

Definitions

  • the invention relates to a fluid detecting instrument in the instrument and meter industry, in particular to an acid-alkali full metal flow temperature sensor.
  • the flow sensor is used in the flow monitoring system. When the flow rate reaches the set flow rate threshold, a detection signal is generated for starting the interlock protection system; their structure is complicated and cumbersome, the installation is difficult, the accuracy is easily affected by temperature, and the resistance is poor. The interference ability is poor, and the gas and liquid cannot be used universally.
  • the temperature sensor is used to display the temperature and generate control signals, and the digital tube is used to display the button setting menu status.
  • an object of the present invention is to provide a flow sensor and a temperature sensor, which have all functions of a temperature sensor and a flow sensor, and have high reliability, accurate detection precision, strong anti-interference ability, and gas resistance.
  • An acid-alkali full metal flow temperature sensor includes a housing, a probe and an electrical portion, the electrical portion being disposed in the housing, the electrical portion including a detecting unit, a circuit board, a display unit, and an external control unit
  • the detecting unit includes a temperature detecting unit and a flow detecting unit, and the temperature detecting unit and the flow detecting unit are installed in the probe;
  • the housing includes an outer casing made of an acid and alkali resistant metal, and a fixing bracket prepared by an insulating material, the fixing bracket being embedded in a cavity of the outer casing, the fixing bracket having a mounting hole for mounting the circuit board a mounting portion and a cavity for housing the circuit board.
  • the beneficial effects of adopting the technical scheme are: combining the flow sensor and the temperature sensor into one, having all the functions of the temperature sensor and the flow sensor, high reliability, accurate detection precision, strong anti-interference ability, and can be used for mediums such as gas and liquid.
  • the real-time monitoring of the flow the shell is made of all-metal material, anti-corrosion and durable, and can achieve a high sealing level, no need to use the potting process, simple structure, convenient installation and maintenance, small size, low cost and beautiful appearance.
  • the design of the fixed bracket improves the degree of insulation protection, and has the advantages of anti-vibration and high reliability. With a metal casing, it can be used with an interference fit structure, without potting, and the protection grade can reach IP68, IP69K food hygiene level.
  • the circuit board includes at least two independent pieces, and the cavity of the fixing bracket is an upper cavity and a lower cavity which are mutually sealed, and the circuit board is respectively disposed on the upper cavity and the lower cavity.
  • the connection line between the circuit boards in the upper and lower chambers is set by the following structure:
  • the upper and lower cavities are integrally embedded with connecting wires or metal posts, and the circuit boards in the upper and lower cavities are connected by the connecting wires, or contacts are disposed on the circuit board, and the circuit boards in the upper and lower cavities pass through The contacts are in contact with corresponding metal posts to achieve electrical connection;
  • a through hole and a sealing rubber ring are disposed on the partition between the upper and lower cavities, and a connecting wire is disposed through the through hole and the sealing rubber ring, and the circuit board in the upper and lower cavity is connected through the connecting wire .
  • the fixed integral package metal column has high stability and shock resistance, which overcomes the problem that the original wire connection is easy to loose, fall off, and disconnection, and the connector or welding can be eliminated. It is more convenient and quick to take the process and disassemble and install it at the same time.
  • circuit disposed on the circuit board includes:
  • a temperature filter circuit connected to the output end of the temperature detecting unit; the output signal of the temperature filter circuit is input to the central processing circuit for processing;
  • the output signal of the flow filter circuit is input to the central processing circuit for processing
  • the central processing circuit is provided with a temperature drift compensation circuit and a voltage range learning circuit;
  • a D/A conversion circuit an input end of the D/A conversion circuit being coupled to an output of the central processing circuit, the voltage range learning circuit providing a digital reference signal to the D/A conversion circuit, the D The output end of the /A conversion circuit is connected to the input end of the reference voltage module, and the D/A conversion circuit converts the digital reference signal into an analog reference signal to the reference voltage module;
  • a reference voltage module having an output connected to the differential amplifier, the reference voltage module processing the analog reference signal to provide a reference voltage for the differential amplifier;
  • a display driving circuit wherein the input end is connected to the central processing circuit, and the output ends thereof are respectively provided with a temperature output end and a flow output end;
  • the display driving circuit is further provided with a gyroscope or a gravity sensing device, and the temperature can be adjusted according to requirements The direction in which the digital display is displayed on the display circuit and the flow display circuit;
  • the display unit includes:
  • a temperature display circuit having an input end connected to the temperature output end and displaying corresponding temperature detection information
  • a flow display circuit wherein the input end is connected to the flow output end, and displays corresponding flow detection information
  • the temperature detecting unit and the flow detecting unit respectively collect the temperature signal and the flow signal of the measured medium and transmit the flow signal to the central processing circuit, and the processed data respectively outputs and/or displays the numerical signal through the temperature display circuit and the flow display circuit. .
  • the so-called learning function is mainly for high and low point learning.
  • the user can select a point as the switching point (threshold value) within this range, and if there is a signal output when the switching point is reached; meanwhile, if the detection medium is lower or higher In this range (that is, below or below the high point) an alarm will be issued.
  • the threshold can be set via an external button or remote adjustment.
  • the present invention is further provided with a gyroscope or a gravity sensing device, which can adjust the direction of the digital display on the display module as needed, so that the sensor can adjust the digital display direction regardless of the installation orientation and the installation position, thereby facilitating the operator.
  • the problem that the display direction is fixed and the reading parameters of some installation positions are inconvenient is overcome in the prior art.
  • circuit further includes:
  • a temperature output circuit having an input end connected to the central processing circuit and an output end connected to an input end of the output protection circuit
  • a flow output circuit having an input end connected to the central processing circuit and an output end connected to the other input end of the output protection circuit
  • An output protection circuit having an output connected to an input of the central processing circuit. If the temperature signal and/or the flow signal exceeds a set value, the central processing circuit is triggered to activate a protection circuit disposed therein.
  • circuit is further provided with an anti-interference module.
  • the central processing circuit generates two monitoring signals corresponding to the flow output and the temperature output respectively, and when the output type of the monitoring signal is a switching output, through an NPN transistor, a PNP transistor, or a relay output, when the monitoring When the output type of the signal is analog output, the output current is 4 to 20 mA and the output voltage is 0 to 10 V.
  • the housing includes an upper cover and a lower cover, the lower cover is provided with two upper slots and two lower slots, the upper slot is provided with a sealing ring, and the lower slot is provided with a sealing
  • the pad, the upper cover and the lower cover are sealed by an interference fit.
  • the fixing bracket is disposed in the upper cover, wherein the fixing bracket is two symmetrical plastic parts, the plastic part is semi-elliptical, and a bayonet is arranged on the inner wall of the semi-ellipse for fixing
  • the circuit board functions as anti-vibration, shielding and anti-interference.
  • the probe includes a probe and a connecting nut
  • the lower cover is provided with a circular hole in the middle, and the circular hole has a boss extending downward, and the probe passes through a circular hole in the middle of the lower cover and passes through Interference fit and fixed with a fixing nut.
  • a top of the probe is provided with a circular hole, and a grounding wire for enhancing the anti-interference ability of the product is installed in the circular hole, and the circular hole has a hole diameter of ⁇ 1.5 mm; preferably, the top of the probe is provided with a step
  • the step is provided with a sealing ring, and the sealing ring plays a role of sealing when the probe is matched with the lower cover.
  • the probe has two card slots, and the upper card slot is matched with the connecting nut, and then fixed by a snap spring.
  • the lower card slot is provided with a sealing ring for waterproofing.
  • a connector for connecting an external cable is further disposed on the housing, and in some embodiments, the connector includes a connecting portion fixed to the outer casing and an integral sealing package on the outer casing. And a metal contact in the cavity provided in the connecting portion, the metal contact is made of a metal column, and penetrates the outer casing and the fixing bracket, and is correspondingly connected with the circuit board, the external cable The connection is operatively connected to the connector, and the signal lines of the external cable are electrically connected to the metal contacts in a one-to-one correspondence.
  • the corresponding number of metal posts (usually copper pillars, or copper pillars, etc.) are prepared according to the number of externally connected contacts, and then the connection portion of the outer casing is installed. And drilling the corresponding position of the fixing bracket, inserting the metal columns one by one into the air, passing through the fixing bracket inside the outer casing and the outer casing, and then filling the gap between the sealing metal column and the outer casing and the fixing bracket with the sealing glue to achieve the sealing.
  • the joint is a flanged hollow cylinder, the flange is used to fix the joint on the outer casing (can be glued or screwed), the cylindrical cavity will be the metal contact cover Live, the cylinder is provided with a thread or a buckle for mating connection with the connector of the external cable.
  • the end face of the metal contact on the outer side of the outer casing is lower than the outer surface of the outer casing, that is, each metal contact is disposed in a circular recess (when installed, Pushing the metal post inside the outer casing so that its outer surface sinks into the through hole of the outer casing), corresponding to the metal probe mounted on the connector on the outer cable, the metal probe is provided with a sealing member
  • the sealing member is an insulating waterproof material (such as plastic, rubber or other elastic insulating material) wrapped on the cylinder of the metal probe, and the top end surface of the metal probe is exposed when the metal probe is When the pins are inserted into the pits in which the metal contacts are located, the end faces thereof are electrically connected to the metal contacts, and A portion of the sealing member is interference-fitted with the outer wall of the recess to achieve the purpose of sealing. At this time, even if the entire sensor is placed in the conductive medium, the use is not affected.
  • 1 is a schematic block diagram of an acid-alkali full metal flow temperature sensor of the present invention.
  • FIG. 2 is a schematic structural view of an acid-alkali-resistant all-metal flow temperature sensor of the present invention.
  • Figure 3 is a cross-sectional view of the acid and alkali resistant all metal flow temperature sensor of the present invention.
  • Figure 4 is an exploded view of the acid and alkali resistant all metal flow temperature sensor of the present invention.
  • an acid-alkali full metal flow temperature sensor includes a housing 1, a probe 3 and an electrical part 2, and the electrical part 2 is disposed in the housing 1, the electrical part 2 includes a detecting unit, a circuit board 21, a display unit (display screen 112), and an external control unit (button 113), the detecting unit includes a temperature detecting unit and a flow detecting unit, and the temperature detecting unit and the flow detecting unit are installed at the Inside the probe, the casing 1 includes an outer casing prepared by an acid and alkali resistant metal, and a fixing bracket prepared by an insulating material (specifically, a plastic member 115 is used, and other insulating materials such as rubber products, other high molecular polymers, etc. may be used.
  • the fixing bracket is embedded in the inner cavity of the outer casing, and the fixing bracket has a mounting portion for mounting the circuit board 21 and a cavity for accommodating the circuit board.
  • the beneficial effects of adopting the technical scheme are: combining the flow sensor and the temperature sensor into one, having all the functions of the temperature sensor and the flow sensor, high reliability, accurate detection precision, strong anti-interference ability, and can be used for mediums such as gas and liquid.
  • the shell is made of all-metal material, anti-corrosion and durable, and can achieve a high sealing level, no
  • the potting process needs to be adopted, the structure is simple, the installation and maintenance are convenient, the volume is small, the cost is low, and the shape is beautiful.
  • the design of the fixed bracket improves the degree of insulation protection, and has the advantages of anti-vibration and high reliability. With a metal casing, it can be used with an interference fit structure, without potting, and the protection grade can reach IP68, IP69K food hygiene level.
  • the acid-resistant alkali metal flow temperature sensor includes a housing 1, a probe 3 and an electrical part 2, the electrical part 2 is disposed in the housing 1, and the electrical part 2 includes a temperature detecting unit.
  • Flow detection unit, differential amplification, filter circuit, central processing circuit usually selectable with single-chip microcomputer, or other integrated circuit and data processing circuit composed of peripheral components
  • reference voltage module usually selectable with single-chip microcomputer, or other integrated circuit and data processing circuit composed of peripheral components
  • reference voltage module usually selectable with single-chip microcomputer, or other integrated circuit and data processing circuit composed of peripheral components
  • reference voltage module D/A conversion, temperature output, flow output, output Protection, display drive, temperature display, flow display, external control, anti-interference module, power conversion module
  • temperature detection unit, flow detection unit, differential amplification, filter circuit, single-chip microcomputer, reference voltage module, D/A Circuits such as conversion, temperature output, flow output, output protection, display drive, etc. are arranged on one or two or three or more circuit boards, and the temperature display and flow
  • the housing 1 can be assembled and mounted by a combination of an upper 11 cover and a lower cover 12.
  • the probe 3 includes a probe 31 and a connecting nut 32, and the probe 3 has an end (upper end) and The lower cover 12 is connected, and the temperature detecting unit and the flow detecting unit are mounted on the other end of the probe 3 (the lower end, that is, the free end), and the connecting nut 32 functions to fix and lock during installation.
  • the circuit disposed on the circuit board includes:
  • a temperature detecting unit connected to the temperature sensor at the input end and a temperature filtering circuit connected to the output end of the temperature detecting unit; the output signal of the temperature filtering circuit is input to the single chip for processing;
  • a flow detecting unit connected to the flow sensor at the input end, a differential amplifier connected to the output end of the flow detecting unit, an input end and a flow filter circuit connected to the differential amplifier output end; an output signal of the flow filter circuit Input to the microcontroller for processing;
  • the single chip microcomputer is provided with a temperature drift compensation circuit and Voltage range learning circuit;
  • a D/A conversion circuit an input end of the D/A conversion circuit is connected to an output end of the single chip microcomputer, and the voltage range learning circuit provides a digital reference signal to the D/A conversion circuit, the D/A An output end of the conversion circuit is connected to an input end of the reference voltage module, and the D/A conversion circuit converts the digital reference signal into an analog reference signal to the reference voltage module;
  • a reference voltage module having an output connected to the differential amplifier, the reference voltage module processing the analog reference signal to provide a reference voltage for the differential amplifier;
  • a display driving circuit wherein the input end is connected to the single chip microcomputer, and the output ends thereof are respectively provided with a temperature output end and a flow output end; the display driving circuit is further provided with a gyroscope or a gravity sensing device, and the temperature display circuit can be adjusted according to requirements And the direction of the digital display on the flow display circuit;
  • the display unit includes:
  • a temperature display circuit having an input end connected to the temperature output end and displaying corresponding temperature detection information
  • a flow display circuit wherein the input end is connected to the flow output end, and displays corresponding flow detection information
  • the temperature detecting unit and the flow detecting unit respectively collect temperature signals and flow signals from the temperature sensor and the flow sensor to be transmitted to the single chip microcomputer, and the processed data respectively output and/or display values through the temperature display circuit and the flow display circuit. signal.
  • the temperature detecting unit is configured to detect a temperature signal of the measured medium, and the detected temperature signal is transmitted to the single chip microcomputer after being processed by the filter circuit;
  • the flow detecting unit is configured to detect the flow rate and temperature of the measured medium, and the flow rate sensing resistance inside the flow detecting unit and
  • the temperature sensing resistor is connected with the single chip microcomputer, and the single chip outputs a digital signal to the D/A conversion module, and the D/A conversion module transmits the analog signal to the reference voltage module, and the flow detecting module and the reference voltage module transmit the signal to the differential amplifying portion for amplification.
  • the filter circuit After being processed by the filter circuit, it is input to the single-chip microcomputer, and the single-chip microcomputer performs internal temperature drift compensation; the voltage range learning device is connected to the single-chip microcomputer, and is used for manually setting the flow test range; the single-chip computer exchanges the collected flow signal and temperature signal. After the processing, the flow output and temperature output are performed.
  • the output protection circuit is mainly used to detect the output signal size, and the output signal collected by the output protection unit is fed back to the single-chip microcomputer, and the single-chip microcomputer judges whether the output is normal; meanwhile, the single-chip microcomputer outputs the drive through serial communication.
  • the display unit drives the display unit output signal to the display module unit, and displays the temperature signal and the flow signal through the digital tube and the LED lamp; the external control unit can realize the automatic flow learning function, which can be realized by the key learning and the remote learning.
  • the button control can also be used to learn menu settings and function selections such as calibration flow high and low points, switch point selection, temperature unit selection, etc.
  • the remote learning function is the same as the button learning function, except that the distance learning is extracted by the "connector 114"
  • the remote cable is used to realize high and low point learning, which is convenient for users to control remotely.
  • the power conversion module is mainly used to provide the required voltage to each unit; the anti-interference module is used to prevent electromagnetic static interference and the like, and improve the stability and reliability of the product.
  • the anti-interference module is mainly composed of one or two anti-interference components, and then some anti-interference techniques are adopted in the circuit layout.
  • the anti-jamming module removes the aforementioned metal casing, plastic parts and grounding wires, and is mainly realized by magnetic beads and common mode choke coils on the circuit, and some anti-interference is applied on the PCB layout.
  • Layout techniques specifically, a common mode choke at the input of the power supply to suppress common mode interference signals in the circuit; and a magnetic bead in parallel behind the choke to eliminate the circuit High-frequency interference signal; at the same time, the power supply unit is connected to the housing and connected to the ground to release excess charge and interference inside the circuit, thereby enhancing the anti-jamming performance of the product.
  • the single chip respectively generates two monitoring signals corresponding to the flow output and the temperature output, and when the output type of the monitoring signal is a switching output, the NPN transistor, the PNP transistor, or the relay output, when the monitoring signal is When the output type is analog output, the output current is 4 to 20 mA and the output voltage is 0 to 10 V. Divided into two-wire and three-wire outputs according to the output mode.
  • the circuit can also be added when necessary:
  • a temperature output circuit having an input end connected to the single chip microcomputer and an output end connected to an input end of the output protection circuit
  • a flow output circuit the input end of which is connected to the single chip microcomputer, and the output end thereof is connected to the other input end of the output protection circuit;
  • the output protection circuit has an output terminal connected to an input end of the single chip microcomputer. If the temperature signal and/or the flow rate signal exceed a set value, the single chip microcomputer is triggered to start a protection circuit disposed therein.
  • the output protection unit can implement various protection functions such as short circuit protection, reverse polarity protection, and overload protection.
  • the temperature display unit uses three seven-segment digital tubes to display the temperature value.
  • the temperature display can also display the forward and reverse directions through the menu setting.
  • the flow display unit uses 10 LEDs to display the flow rate, arranged from left to right, and the number of LEDs illuminated. To indicate the size of the traffic.
  • the housing 1 includes an upper cover 11 and a lower cover 12.
  • the upper cover 11 is provided with a display cover 112, a button 113, and a connector 114.
  • the display cover 112 includes a temperature display unit A and a flow display unit B. 112 is fixed from the inside of the upper cover through the pressing piece 111 for displaying the current flow rate and temperature; the button 113 is loaded from the surface of the housing to learn menu settings such as calibration flow high and low points, switch point selection, temperature unit selection, and the like.
  • the connector 114 is provided with a sealing ring extending from the circular hole on the side of the upper cover 11 into the housing, and the connector 114 is used for connecting the external cable to supply power to the circuit part, and can also be realized by an external cable.
  • the function of remote flow learning; the plastic part 115 is used to fix the circuit part 2, and has the functions of anti-vibration, insulation and anti-interference.
  • the lower cover 12 is provided with two card slots, the upper card slot is provided with a sealing ring 121, and the lower card slot is provided with a sealing pad 122, and the sealing ring 121 and the sealing pad 122 are waterproof and dustproof. .
  • the double-slot design greatly improves the sealing performance, and it is waterproof, moisture-proof and dust-proof, and it is easy to increase the explosion-proof grade.
  • a circular hole is arranged in the middle of the lower cover, and a circular boss extends downward.
  • the probe 3 includes a probe 31 and a connecting nut 32. The probe is ⁇ 10 mm, the top is provided with a step, and the step is provided with a sealing ring 311.
  • the sealing ring 311 plays when the probe 31 and the lower cover 12 are matched.
  • the function of the sealing is to provide two card slots on the probe.
  • the upper card slot is fixedly engaged with the connecting nut 32 and then fixed by the circlip 312; the lower card slot is provided with a sealing ring 313 for waterproofing.
  • the housing 1 includes an upper cover 11 and a lower cover 12.
  • the upper cover 11 and the lower cover 12 are both made of a metal material, and the upper cover 11 and the lower cover 12 are fixed by an interference fit, and the seal ring on the lower cover 12 is passed.
  • probe 3 is made of anti-corrosive material, anti- The rot ability is relatively strong, the probe 31 is inserted through the circular hole in the middle of the lower cover 12, a sealing ring is added on the top of the probe 31, fixed by the interference fit, and then the nut 32 is passed through the probe 31 and the card at the upper part of the probe.
  • the slot clearance is matched, and then fixed by the snap spring 312.
  • the card slot at the lower part of the probe is sealed to prevent water leakage during installation.
  • the menu is displayed for the present invention.
  • the first column is the setup menu
  • the second column is the menu function comment
  • the third column is the parameter setting range
  • the fourth column is the setting range comment
  • the comment indicates the menu object.
  • the last action of the table is the remote learning line setting, which is only for the learning function of the traffic, and has the same function as the "high point learning” "low point learning” in the menu, in order to set the flow range. This function setting is convenient for users to operate in the field. Users only need to short the white line in the output line to the positive pole of the power supply to operate.
  • the setting method is as shown in Fig. 2.
  • the left MODE/ENTER key is the menu setting and confirmation function.
  • the right LEARN/SET key is parameter setting.
  • the MODE/ENTER key set the parameters of the corresponding menu (also displayed on the digital tube), and confirm the parameter and press the MODE/ENTER key again.
  • SP1 temperature switch point: After setting SP1, when the temperature rises or exceeds the SP1 temperature value, the output is open (normally open), (normally closed); when the temperature is lowered, it is reached or low At the SP1 temperature, the output is closed (normally open), (normally closed).
  • rp1 hysteresis: After rP1 is set, when the temperature rises or exceeds the SP1 temperature value, the output is open (normally open), (normally closed); when the temperature is lowered, when it reaches or falls below rP1, the output The end is closed (normally open), (normally closed).
  • SP flow switch point: between the high and low points set by the system, you can select any point as the SP point.
  • the output end is open (normally open), (normally closed)
  • the output is closed (normally open), (normally closed).
  • FAC restore factory settings: return all menu and data settings to the factory default settings.
  • Remote adjustment It is the same as the button learning function. The difference is that the remote learning is to realize the high and low point learning and restore the factory settings through the remote cable led out by the "connector 114", which is convenient for the user to remotely control.
  • the circuit board includes at least two independent pieces, and the cavity of the fixing bracket is an upper cavity and a lower cavity which are mutually sealed, and the circuit board is respectively disposed on the upper cavity and the lower cavity.
  • the connection line between the circuit boards in the upper and lower cavities is set by the following structure:
  • the upper and lower cavities are integrally embedded with connecting wires or metal posts, and the circuit boards in the upper and lower cavities are connected by the connecting wires, or contacts are disposed on the circuit board, and the circuit boards in the upper and lower cavities pass through The contacts are in contact with corresponding metal posts to achieve electrical connection;
  • a through hole and a sealing rubber ring are disposed on the partition between the upper and lower cavities, and a connecting wire is disposed through the through hole and the sealing rubber ring, and the circuit board in the upper and lower cavity is connected through the connecting wire .
  • the program further improves the sealing level and prolongs the service life.
  • Metal column and contact connection The way to make the installation easier, while increasing the electrical connection contact area and improving electrical reliability.
  • the fixed integrated package metal column has high stability and shock resistance, overcomes the problem that the original wire connection is easy to loose, fall off, and breaks. It can also eliminate the connector or welding process, and the disassembly and installation are more convenient and quick.
  • the present invention is further provided with a gyroscope or a gravity sensing device, which can adjust the direction of the digital display on the display module as needed, so that the sensor can adjust the digital display regardless of the installation orientation and the installation position.
  • the direction is convenient for the operator to read the data, and overcomes the problem that the display direction is fixed in the prior art, and the reading parameters are inconvenient in some installation positions.
  • a connector 114 for connecting an external cable is further provided on the housing, and in some embodiments, the connector 114 includes a connection portion fixed to the outer casing 1 and Integrally sealing the metal contacts on the outer casing 1 and located in the cavity provided by the connecting portion, the metal contacts are made of metal columns, and penetrate the outer casing and the fixing bracket, and The circuit board is correspondingly connected, and the external cable is movably connected through a connector matched with the connecting portion, and the signal wires of the external cable are electrically connected to the metal contacts in one-to-one correspondence.
  • the corresponding number of metal posts (usually copper pillars, or copper pillars, etc.) are prepared according to the number of externally connected contacts, and then the connection portion of the outer casing is installed. And drilling the corresponding position of the fixing bracket, inserting the metal columns one by one into the air, passing through the fixing bracket inside the outer casing and the outer casing, and then filling the gap between the sealing metal column and the outer casing and the fixing bracket with the sealing glue to achieve the sealing.
  • the joint is a flanged hollow cylinder, the flange is used to fix the joint on the outer casing (can be glued or screwed), the cylindrical cavity will be the metal contact cover Live, the cylinder is provided with a thread or a buckle for mating connection with the connector of the external cable.
  • the end face of the metal contact on the outer side of the outer casing is lower than the outer surface of the outer casing, that is, each metal contact is disposed in a circular recess (when installed, Pushing the metal post inside the outer casing so that its outer surface sinks into the through hole of the outer casing), corresponding to the metal probe mounted on the connector on the outer cable, the metal probe is provided with a sealing member
  • the sealing member is a column of the metal probe a body-insulated insulating waterproof material (such as plastic, rubber or other elastic insulating material), the top end surface of the metal probe is exposed, and the metal probe is inserted into the metal contact one by one
  • the recess is electrically connected to the metal contact, and a part of the sealing member is interference-fitted with the outer wall of the recess to achieve the purpose of sealing. At this time, even if the entire sensor is placed in the conductive medium, Does not affect the use.
  • circuit is further provided with an anti-interference module.
  • the housing comprises an upper cover and a lower cover, the lower cover is provided with two upper slots and two lower slots, the upper slot is provided with a sealing ring, and the lower portion
  • the card slot is provided with a gasket, and the upper cover and the lower cover are sealed by an interference fit.
  • the fixing bracket is disposed in the upper cover, the fixing bracket is two symmetrical plastic parts, the plastic part is semi-elliptical, and 15 bayonet ports are arranged on the inner wall of the semi-ellipse (card The number of ports can be arbitrarily set according to requirements), and is used to fix the circuit board to prevent vibration, shielding, and anti-interference. As shown in Figure 4.
  • the probe comprises a probe and a connecting nut, and a circular hole is arranged in the middle of the lower cover, and a circular boss extends downwardly, and the probe passes through a circular hole in the middle of the lower cover, and the interference fit is adopted. And fixed with a fixing nut.
  • a top of the probe is provided with a circular hole, and a grounding wire for enhancing the anti-interference ability of the product is installed in the circular hole, and the circular hole has a hole diameter of ⁇ 1.5 mm; preferably, the top of the probe is provided with a step
  • the step is provided with a sealing ring, and the sealing ring plays a role of sealing when the probe is matched with the lower cover.
  • the probe has two card slots, and the upper card slot is matched with the connecting nut, and then fixed by a snap spring.
  • the lower card slot is provided with a sealing ring for waterproofing.

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  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

一种抗酸碱全金属流量温度传感器，包括壳体(1)、探头(3)和电气部分(2)，所述壳体(1)包括，耐酸碱金属制备的外壳，以及绝缘材质制备的固定支架，所述固定支架嵌设于所述外壳的内腔中，所述固定支架具有用于安装电路板(21)的安装部及容纳所述电路板(21)的腔体。由于壳体(1)采用全金属材质，防腐耐用，并且可以做到很高的密封等级，无需再采用灌封工艺，结构简单，安装、维修方便，体积小、成本低，造型美观。固定支架的设计，提高了绝缘防护等级，同时具备抗震动、可靠性高等优点。

Description

抗酸碱全金属流量温度传感器 技术领域
本发明涉及仪器仪表行业中一种流体检测仪器，尤其涉及一种抗酸碱全金属流量温度传感器。
背景技术
在现有技术中，对于流体的流量和温度检测是两个单独的产品。
流量传感器用于流量监控***中，当流速达到设定的流速阀值时，产生检测信号，用于启动连锁保护***；它们的结构复杂笨重，安装困难，精度易受温度影响而变差，抗干扰能力差，并且气体、液体不能通用。温度传感器用于显示温度和产生控制信号，数码管用于显示按键设定菜单状态。
以上两种设备是自动化***中最常用的，大多数***中会同时用到这两类传感器，作为两个分别独立的设备，操作、维护和安装都比较繁琐，同时带来***接线复杂和可靠性问题。常用的流量传感器或温度传感器，不具备对检测信号进行全自动化控制、报警、启动连锁保护***等功能，而且大多已灌封为主，工艺复杂、成本高、维修不方便，耐腐蚀能力差，体积较大，造型不够美观。
发明内容
为解决上述问题，本发明的目的在于提供一种将流量传感器和温度传感器合二为一，具备温度传感器和流量传感器的所有功能，可靠性高、检测精度准确，抗干扰能力强，可对气体、液体等介质进行流量实时监控；采用过盈配合结构，不需灌封，防护等级可达IP68、IP69K食品卫生等级；壳体采用全金属材质，防腐耐用；结构简单，安装、维修方便，体积小、成本低，造型美观的抗酸碱全金属流量温度传感器。
为达到上述目的，本发明的技术方案是：
一种抗酸碱全金属流量温度传感器，包括壳体、探头和电气部分，所述电气部分设置在所述壳体内，所述电气部分包括检测单元、电路板、显示单元、外部控制单元，所述检测单元包括温度检测单元、流量检测单元，所述温度检测单元、流量检测单元安装于所述探头内；
所述壳体包括，耐酸碱金属制备的外壳，以及绝缘材质制备的固定支架，所述固定支架嵌设于所述外壳的内腔中，所述固定支架具有用于安装所述电路板的安装部及容纳所述电路板的腔体。
采用本技术方案的有益效果是：将流量传感器和温度传感器合二为一，具备温度传感器和流量传感器的所有功能，可靠性高、检测精度准确，抗干扰能力强，可对气体、液体等介质进行流量实时监控，壳体采用全金属材质，防腐耐用，并且可以做到很高的密封等级，无需再采用灌封工艺，结构简单，安装、维修方便，体积小、成本低，造型美观。固定支架的设计，提高了绝缘防护等级，同时具备抗震动、可靠性高等优点。采用金属外壳，就可以采用过盈配合结构，不需灌封，防护等级可达IP68、IP69K食品卫生等级。
进一步的，所述电路板包括至少独立的两块，所述固定支架的腔体为相互独立密封的上腔体和下腔体，所述电路板分别设置于所述上腔体和下腔体中，所述上下腔体中电路板之间的连接线通过以下结构设置：
所述上下腔体上一体预埋连接线或金属柱，所述上下腔体中的电路板通过所述连接线连接，或在电路板上设置触点，所述上下腔体中的电路板通过所述触点与对应的金属柱接触而实现电连接；
或在上下腔体之间的隔板上设置通孔及密封胶圈，再设置一条连接线穿过所述通孔及密封胶圈，所述上下腔体中的电路板通过所述连接线连接。
进一步提高密封等级，延长使用寿命。金属柱与触点连接的方式，使得安装更加简单，同时提高了电连接接触面积，提高了电气可靠性。另外，固定的一体封装的金属柱具有高度的稳定性和抗震能力，克服了原来线连接容易松动、脱落、断线的问题，也可以取消接插件或焊 接工序，同时拆卸安装都更加方便快捷。
进一步的，设置于所述电路板上的电路包括：
输入端与所述温度检测单元输出端连接的温度滤波电路；所述温度滤波电路的输出信号输入给中央处理电路进行处理；
输入端与流量检测单元输出端连接的差动放大器、输入端与所述差动放大器输出端连接流量滤波电路；所述流量滤波电路的输出信号输入给中央处理电路进行处理；
作为数据处理器的中央处理电路，所述中央处理电路设有温度漂移补偿电路和电压范围学习电路；
D/A转换电路，所述D/A转换电路的输入端与所述中央处理电路的一个输出端连接，所述电压范围学习电路为所述D/A转换电路提供数字基准信号，所述D/A转换电路的输出端与基准电压模块的输入端连接，所述D/A转换电路将数字基准信号转换为模拟基准信号给基准电压模块；
基准电压模块，其输出端与所述差动放大器连接，所述基准电压模块将模拟基准信号处理后，为差动放大器提供基准电压；
显示驱动电路，其输入端与所述中央处理电路连接，其输出端分别设有温度输出端和流量输出端；所述显示驱动电路还设有陀螺仪或重力感应装置，可以根据需要，调整温度显示电路和流量显示电路上数字显示的方向；
所述显示单元包括：
温度显示电路，其输入端与所述温度输出端连接，并显示对应的温度检测信息；
流量显示电路，其输入端与所述流量输出端连接，并显示对应的流量检测信息；
所述温度检测单元、流量检测单元分别采集被测量介质的温度信号、流量信号传输到所述中央处理电路，经处理后数据分别通过所述温度显示电路、流量显示电路输出和/或显示数值信号。
具有流量自动学习功能，所谓学习功能，主要是进行高低点学习， 通过高点和低点学习对测量设定一个范围，用户可以在这个范围内选择一个点作为开关点(阀值)，如果达到开关点时会有信号输出；同时，如果检测介质低于或高于这个范围(也就是低于低点或高于高点)会进行报警。可以通过外部按键或远程调整来设置其阀值。进一步的，本发明还设有陀螺仪或重力感应装置，可以根据需要，调整显示模块上数字显示的方向，这样，传感器无论安装方位和安装位置如何，都可以通过调整数字显示方向，方便作业人员来读取数据，克服了现有技术中显示方向固定不变，某些安装位置读取参数不便的问题。
进一步的，所述电路还包括：
温度输出电路，其输入端与所述中央处理电路连接，其输出端与输出保护电路的一个输入端连接；
流量输出电路，其输入端与所述中央处理电路连接，其输出端与输出保护电路的另一个输入端连接；
输出保护电路，其输出端与所述中央处理电路的一个输入端连接，如果温度信号和/或流量信号超过设定值，将触发中央处理电路启动设置于其内部的保护电路。
进一步的，所述电路还设有抗干扰模块。
进一步的，所述中央处理电路分别对应流量输出和温度输出产生两路监控信号，当所述监控信号的输出类型为开关量输出时，通过NPN三极管、PNP三极管、或继电器输出，当所述监控信号的输出类型为模拟量输出时，输出电流为4～20mA、输出电压为0～10V。
进一步的，所述壳体包括上盖和下盖，所述下盖设有上部卡槽和下部卡槽2个卡槽，所述上部卡槽设有密封圈，所述下部卡槽设有密封垫，上盖与下盖通过过盈配合密封。
进一步的，所述固定支架设置于所述上盖中，所述固定支架为2个对称的塑胶件，所述塑胶件呈半椭圆状，在半椭圆的内壁上设有卡口，用来固定所述电路板，起到防振、屏蔽、抗干扰的作用。
进一步的，所述探头包括探棒和连接螺母，所述下盖中间设有圆孔，圆孔向下延伸有一个凸台，所述探棒穿过下盖中间的圆孔，通过 过盈配合并用固定螺母固定。
进一步的，所述探棒顶部设有一个圆孔，所述圆孔中安装有用于增强产品抗干扰能力接地线，所述圆孔孔径≤1.5mm；优选的，所述探棒顶部设有台阶，台阶上设有密封圈，密封圈在探棒与下盖配合时起到密封的作用，探棒上设有2个卡槽，上部的卡槽通过与连接螺母间隙配合，再用卡簧固定；下部卡槽上设有密封圈，起到防水作用。
进一步的，在所述壳体上还设有用于连接外部电缆的接插件，在某些实施例中，所述接插件包括固定于所述外壳上的连接部和一体密封封装于所述外壳上并位于所述连接部设有的腔体中的金属触点，所述金属触点由金属柱制成，并贯穿所述外壳与固定支架，并与所述电路板对应连接，所述外部电缆通过与所述连接部匹配的连接头活动连接，同时使外部电缆的各信号线与所述金属触点一一对应电连接。具体来说，在生产制备接插件时，先根据需要的对外连接的触点数量，制备相应数量的金属柱(一般选用铜柱，或铜柱镀银等)，然后在外壳安装连接部的位置及固定支架对应的位置钻孔，将金属柱逐一***上述空中，使其穿过外壳及外壳内部的固定支架，然后用密封胶灌注密封金属柱与外壳及固定支架之间的缝隙，达到密封的目的，然后将连接部安装到位(一般连接部是一个带法兰的中空圆柱，法兰用于将连接部固定在外壳上(可以粘接或螺丝固定)，圆柱的腔体将金属触点罩住，圆柱上设有用于与外部电缆的接插头匹配连接的螺纹或卡扣。
为了更进一步优化上述密封方案，所述金属触点位于外壳外部的一侧的端面低于所述外壳的外表面，即每个金属触点都设置在一个圆形凹坑中(在安装时，将金属柱向外壳内部推移，使其外部表面沉入外壳的通孔中)，与之对应，安装于外部电缆上的接插件上的金属探针，所述金属探针设有密封部件，所述密封部件为所述金属探针的柱体上包裹的绝缘防水的材料(如塑料、橡胶或其他具有弹性的绝缘材料制成)，所述金属探针的顶端端面裸露，当所述金属探针一一对应***所述金属触点所在的凹坑时，其端面与所述金属触点电连接，其 密封部件的一部分与所述凹坑外壁过盈配合，从而达到密封的目的，此时，即使整个传感器都置于导电介质中，也不影响使用。
附图说明
图1为本发明抗酸碱全金属流量温度传感器的原理框图。
图2为本发明抗酸碱全金属流量温度传感器的结构示意图。
图3为本发明抗酸碱全金属流量温度传感器的剖视图。
图4为本发明抗酸碱全金属流量温度传感器的***图。
其中：1.壳体11.上盖111.压合片112.显示罩113.按键114.接插件115塑胶件12.下盖121.密封圈122.密封垫2.电路部分3.探头31.探棒311.密封圈312.卡簧313.密封圈32.连接螺母21.电路板22.检测单元
具体实施方式
下面结合附图和具体实施方式对本发明作进一步详细的说明。
如图2及图3所示，一种抗酸碱全金属流量温度传感器，包括壳体1、探头3和电气部分2，所述电气部分2设置在所述壳体1内，所述电气部分2包括检测单元、电路板21、显示单元(显示屏112)、外部控制单元(按键113)，所述检测单元包括温度检测单元和流量检测单元，所述温度检测单元、流量检测单元安装于所述探头内部，所述壳体1包括，耐酸碱金属制备的外壳，以及绝缘材质制备的固定支架(具体使用塑胶件115，也可以是其他绝缘材质，如橡胶制品、其它高分子聚合物等)，所述固定支架嵌设于所述外壳的内腔中，所述固定支架具有用于安装所述电路板21的安装部及容纳所述电路板的腔体。
采用本技术方案的有益效果是：将流量传感器和温度传感器合二为一，具备温度传感器和流量传感器的所有功能，可靠性高、检测精度准确，抗干扰能力强，可对气体、液体等介质进行流量实时监控，壳体采用全金属材质，防腐耐用，并且可以做到很高的密封等级，无 需再采用灌封工艺，结构简单，安装、维修方便，体积小、成本低，造型美观。固定支架的设计，提高了绝缘防护等级，同时具备抗震动、可靠性高等优点。采用金属外壳，就可以采用过盈配合结构，不需灌封，防护等级可达IP68、IP69K食品卫生等级。
具体如图1、2、3所示，抗酸碱全金属流量温度传感器，包括壳体1、探头3和电气部分2，电气部分2设置在壳体1内，电气部分2包括温度检测单元、流量检测单元、差动放大、滤波电路、中央处理电路(一般可选用单片机、或其它集成电路及***元件组成的数据处理电路)、基准电压模块、D/A转换、温度输出、流量输出、输出保护、显示驱动、温度显示、流量显示、外部控制、抗干扰模块、电源转换模块；其中根据需要，温度检测单元、流量检测单元、差动放大、滤波电路、单片机、基准电压模块、D/A转换、温度输出、流量输出、输出保护、显示驱动等电路设置在一块或两块或三块及以上电路板上，温度显示及流量显示可以集成在一块显示屏112上，也可以分别由两个显示屏显示。
在实际应用中，所述壳体1可以采用上11盖和下盖12结合的结构，方便制作和安装，所述探头3包括探棒31和连接螺母32，所述探头3一端(上端)与下盖12连接，温度检测单元和流量检测单元安装在探头3的另一端(下端即自由端)，连接螺母32在安装时起到固定、锁紧的作用。
设置于所述电路板上的电路包括：
输入端与所述温度传感器连接的温度检测单元、输入端与所述温度检测单元输出端连接的温度滤波电路；所述温度滤波电路的输出信号输入给单片机进行处理；
输入端与所述流量传感器连接的流量检测单元、输入端与流量检测单元输出端连接的差动放大器、输入端与所述差动放大器输出端连接流量滤波电路；所述流量滤波电路的输出信号输入给单片机进行处理；
作为数据处理器的单片机，所述单片机设有温度漂移补偿电路和 电压范围学习电路；
D/A转换电路，所述D/A转换电路的输入端与所述单片机的一个输出端连接，所述电压范围学习电路为所述D/A转换电路提供数字基准信号，所述D/A转换电路的输出端与基准电压模块的输入端连接，所述D/A转换电路将数字基准信号转换为模拟基准信号给基准电压模块；
基准电压模块，其输出端与所述差动放大器连接，所述基准电压模块将模拟基准信号处理后，为差动放大器提供基准电压；
显示驱动电路，其输入端与所述单片机连接，其输出端分别设有温度输出端和流量输出端；所述显示驱动电路还设有陀螺仪或重力感应装置，可以根据需要，调整温度显示电路和流量显示电路上数字显示的方向；
所述显示单元包括：
温度显示电路，其输入端与所述温度输出端连接，并显示对应的温度检测信息；
流量显示电路，其输入端与所述流量输出端连接，并显示对应的流量检测信息；
所述温度检测单元、流量检测单元分别采集来自温度传感器和流量传感器的温度信号、流量信号传输到所述单片机，经处理后数据分别通过所述温度显示电路、流量显示电路输出和/或显示数值信号。
如图1所示，电气部分的检测原理如下：
温度检测单元用来检测被测介质的温度信号，通过滤波电路处理后将检测的温度信号传输给单片机；流量检测单元用来检测被测介质的流速和温度，流量检测单元内部的流速感应电阻和温度感应电阻与单片机连接，单片机输出数字信号给D/A转换模块，D/A转换模块将模拟信号传输给基准电压模块，流量检测模块与基准电压模块一起将信号传输给差动放大部分放大，经滤波电路处理后输给单片机，单片机再进行内部温度漂移补偿；电压范围学习装置连接于单片机，用于人工设置流量测试范围；单片机将采集的流量信号和温度信号进行换 算处理后进行流量输出和温度输出，输出保护电路主要用来检测输出信号大小，并将输出保护单元采集的输出信号反馈给单片机，单片机判断是否输出正常；同时，单片机通过串行通信输出给驱动显示单元，驱动显示单元输出信号给显示模块单元，通过数码管和LED灯对温度信号和流量信号进行显示；外部控制单元可以实现流量自动学习功能，可以通过按键学习和远程学习两种方式来实现；按键控制还可以用于学习校准流量高低点、开关点选择、温度单位选择等菜单设置和功能选择；远程学习功能同按键学习功能是一样的，区别在于远程学习是通过″接插件114″引出的远程线缆来实现高低点学习的，方便用户远距离操控。电源转换模块主要用来给各个单元提供所需要的电压；抗干扰模块用来防止电磁静电等干扰，提高产品的稳定性和可靠性。所述抗干扰模块主要是由一两个抗干扰元件组成，再在电路布局时采用一些增强抗干扰的技巧。抗干扰模块除去前面提到的金属外壳、塑胶件、接大地线外，在电路上主要是由磁珠和共模扼流圈来实现，再加上PCB布局上的运用了一些增强抗干扰的布局技巧，具体来说，在电源的输入端设有共模扼流圈，用来抑制电路中的共模干扰信号；同时，在扼流圈的后面并联一个磁珠，用来消除电路中的高频干扰信号；同时，电源单元与壳体连接并连接大地，以释放电路内部多余电荷和干扰，从而增强产品的抗干扰性能。
进一步的，所述单片机分别对应流量输出和温度输出产生两路监控信号，当所述监控信号的输出类型为开关量输出时，通过NPN三极管、PNP三极管、或继电器输出，当所述监控信号的输出类型为模拟量输出时，输出电流为4～20mA、输出电压为0～10V。按输出方式分为，两线制和三线制输出。
在必要的时候，所述电路还可以增设：
温度输出电路，其输入端与所述单片机连接，其输出端与输出保护电路的一个输入端连接；
流量输出电路，其输入端与所述单片机连接，其输出端与输出保护电路的另一个输入端连接；
输出保护电路，其输出端与所述单片机的一个输入端连接，如果温度信号和/或流量信号超过设定值，将触发单片机启动设置于其内部的保护电路。
输出保护单元可以实现短路保护、反极性保护、过载保护等多种保护功能。
温度显示单元采用3个七段数码管显示温度数值，温度显示通过菜单设置还可以进行正反向显示；流量显示单元采用10个LED显示流量，从左至右一字排列，用LED发光的数目来表示流量的大小。
如图3所示，壳体1包括上盖11和下盖12，上盖11设有显示罩112、按键113、接插件114，显示罩112包括温度显示单元A和流量显示单元B，显示罩112从上盖内部通过压合片111固定，用来显示当前的流量和温度；按键113从壳体的表面装入，用来学习校准流量高低点、开关点选择、温度单位选择等菜单设置和功能选择；接插件114上设有密封圈，从上盖11侧面的圆孔伸入壳体，接插件114用来连接外接线缆，给电路部分供电的同时，还可以通过外接线缆来实现远程流量学习的功能；塑胶件115用来固定电路部分2，起到抗震、绝缘、抗干扰的作用。
如图3所示，下盖12设有2个卡槽，上部卡槽上设有密封圈121，下部卡槽上设有密封垫122，密封圈121和密封垫122起到防水防尘的效果。双槽设计大大提高了密封性能，起到防水、防潮和防尘的作用，也容易提高防爆等级。下盖中间设有一个圆孔，圆孔向下延伸有一个凸台。如图3所示，探头3包括探棒31和连接螺母32，探棒≤10mm，顶部设有台阶，台阶上设有密封圈311，密封圈311在探棒31与下盖12配合时起到密封的作用，探棒上设有2个卡槽，上部的卡槽通过与连接螺母32间隙配合，再用卡簧312固定；下部卡槽上设有密封圈313，起到防水作用。
壳体1包含上盖11和下盖12，上盖11和下盖12均采用金属材料制成，上盖11和下盖12之间通过过盈配合来固定，通过下盖12上的密封圈121和密封垫122来密封；探头3采用防腐蚀材料制成，防 腐能力比较强，探棒31穿过下盖12中间的圆孔装入，在探棒31顶部加密封圈，通过过盈配合固定，然后连接螺母32穿过探棒31与探棒上部的卡槽间隙配合，再用卡簧312固定，探棒下部的卡槽加密封圈防止安装时漏水。
如表1所示，为本发明显示菜单。其中第一列为设置菜单，第二列为菜单功能注释，第三列为参数设置范围，第四列为设置范围的注释，备注说明菜单对象。表格最后一行为远程学习线设置，它只针对流量的学习功能，与菜单中的″高点学习″″低点学习″功能相同，目的是设定流量范围。此功能设置是方便用户，现场操作，用户只需将输出线中的white线与电源正极短接即可操作。
其设置方法，参看图2，显示面板下部有两个按键，左边MODE/ENTER键为菜单设置和确认功能，每按一次菜单顺序显示在数码管上，右边LEARN/SET键为参数设定，用配合MODE/ENTER键，对相应菜单进行参数设置(同样在数码管上显示)，参数确认再次按MODE/ENTER键。
表1：
Figure PCTCN2016075205-appb-000001
Figure PCTCN2016075205-appb-000002
上表中：″SP1″温度开关点：设定好SP1后，当温度升高或超过SP1温度值时，输出端打开(常开)，(常闭相反)；当温度降低时，达到或低于SP1温度时，输出端关闭(常开)，(常闭相反)。
″rp1″迟滞：设定好rP1后，当温度升高或超过SP1温度值时，输出端打开(常开)，(常闭相反)；当温度降低时，达到或低于rP1温度时，输出端关闭(常开)，(常闭相反)。
″dIS″显示模式：在菜单″dIS″模式下，可以设定显示模式是″℃″还是″°F″。
″OU1″开关输出：在菜单″OU1″模式下，用户可以根据自己的需求设定流量温度同时常开、流量温度同时常闭、温度常开流量常闭、温度常闭流量常开4种模式。
″p_d″反向输出：在菜单″p_d″模式下，可以设定输出方式是正向显示还是反向显示，设置为″p″则为正向显示，设置为″d″ 则为反向显示。
″SP″流量开关点：在***设定的高点和低点之间，可以选择任意一点作为SP点，当流量达到或超过SP值时，输出端打开(常开)，(常闭相反)；当流量达到或低于SP时，输出端关闭(常开)，(常闭相反)。
″rE″远程调节设定：在″rE″模式下，可以设定″远程调整″功能是否开启。如果选择″EN″，则可以通过远程线缆来进行高低点的学习；反之，选择″dEN″，则不能通过远程线缆来进行高低点的学习。
″HIF″高点学习：在″HIF″模式下，将介质流速调至***所需的最大流速，对当前的流速进行学习和存储。
″LOF″低点学习：在″LOF″模式下，将介质流速调至***所需的最小流速，对当前的流速进行学习和存储。
″FAC″恢复出厂设定：将所有菜单、数据的设定返回到出厂时的设定值。
″远程调整″：同按键学习功能是一样的，区别在于远程学习是通过″接插件114″引出的远程线缆来实现高低点学习、恢复出厂设置，方便用户远距离操控。
在一些特殊场所，所述电路板包括至少独立的两块，所述固定支架的腔体为相互独立密封的上腔体和下腔体，所述电路板分别设置于所述上腔体和下腔体中，所述上下腔体中电路板之间的连接线通过以下结构设置：
所述上下腔体上一体预埋连接线或金属柱，所述上下腔体中的电路板通过所述连接线连接，或在电路板上设置触点，所述上下腔体中的电路板通过所述触点与对应的金属柱接触而实现电连接；
或在上下腔体之间的隔板上设置通孔及密封胶圈，再设置一条连接线穿过所述通孔及密封胶圈，所述上下腔体中的电路板通过所述连接线连接。
本方案进一步提高密封等级，延长使用寿命。金属柱与触点连接 的方式，使得安装更加简单，同时提高了电连接接触面积，提高了电气可靠性。另外，固定的一体封装的金属柱具有高度的稳定性和抗震能力，克服了原来线连接容易松动、脱落、断线的问题，也可以取消接插件或焊接工序，同时拆卸安装都更加方便快捷。
在另外一些实施例中，本发明还设有陀螺仪或重力感应装置，，可以根据需要，调整显示模块上数字显示的方向，这样，传感器无论安装方位和安装位置如何，都可以通过调整数字显示方向，方便作业人员来读取数据，克服了现有技术中显示方向固定不变，某些安装位置读取参数不便的问题。
为了进一步提高产品的密封性能，在所述壳体上还设有用于连接外部电缆的接插件114，在某些实施例中，所述接插件114包括固定于所述外壳1上的连接部和一体密封封装于所述外壳1上并位于所述连接部设有的腔体中的金属触点，所述金属触点由金属柱制成，并贯穿所述外壳与固定支架，并与所述电路板对应连接，所述外部电缆通过与所述连接部匹配的连接头活动连接，同时使外部电缆的各信号线与所述金属触点一一对应电连接。具体来说，在生产制备接插件时，先根据需要的对外连接的触点数量，制备相应数量的金属柱(一般选用铜柱，或铜柱镀银等)，然后在外壳安装连接部的位置及固定支架对应的位置钻孔，将金属柱逐一***上述空中，使其穿过外壳及外壳内部的固定支架，然后用密封胶灌注密封金属柱与外壳及固定支架之间的缝隙，达到密封的目的，然后将连接部安装到位(一般连接部是一个带法兰的中空圆柱，法兰用于将连接部固定在外壳上(可以粘接或螺丝固定)，圆柱的腔体将金属触点罩住，圆柱上设有用于与外部电缆的接插头匹配连接的螺纹或卡扣。
为了更进一步优化上述密封方案，所述金属触点位于外壳外部的一侧的端面低于所述外壳的外表面，即每个金属触点都设置在一个圆形凹坑中(在安装时，将金属柱向外壳内部推移，使其外部表面沉入外壳的通孔中)，与之对应，安装于外部电缆上的接插件上的金属探针，所述金属探针设有密封部件，所述密封部件为所述金属探针的柱 体上包裹的绝缘防水的材料(如塑料、橡胶或其他具有弹性的绝缘材料制成)，所述金属探针的顶端端面裸露，当所述金属探针一一对应***所述金属触点所在的凹坑时，其端面与所述金属触点电连接，其密封部件的一部分与所述凹坑外壁过盈配合，从而达到密封的目的，此时，即使整个传感器都置于导电介质中，也不影响使用。
进一步的，所述电路还设有抗干扰模块。
为了便于制作、安装和维护，所述壳体包括上盖和下盖，所述下盖设有上部卡槽和下部卡槽2个卡槽，所述上部卡槽设有密封圈，所述下部卡槽设有密封垫，上盖与下盖通过过盈配合密封。
进一步的，所述固定支架设置于所述上盖中，所述固定支架为2个对称的塑胶件，所述塑胶件呈半椭圆状，在半椭圆的内壁上设有15个卡口(卡口的数量根据需要可以任意设定)，用来固定所述电路板，起到防振、屏蔽、抗干扰的作用。如图4所示。
进一步的，所述探头包括探棒和连接螺母，所述下盖中间设有圆孔，圆孔向下延伸有一个凸台，所述探棒穿过下盖中间的圆孔，通过过盈配合并用固定螺母固定。
进一步的，所述探棒顶部设有一个圆孔，所述圆孔中安装有用于增强产品抗干扰能力接地线，所述圆孔孔径≤1.5mm；优选的，所述探棒顶部设有台阶，台阶上设有密封圈，密封圈在探棒与下盖配合时起到密封的作用，探棒上设有2个卡槽，上部的卡槽通过与连接螺母间隙配合，再用卡簧固定；下部卡槽上设有密封圈，起到防水作用。
以上所述的仅是本发明的优选实施方式，应当指出，对于本领域的普通技术人员来说，在不脱离本发明创造构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。

Claims (10)

  1. 一种抗酸碱全金属流量温度传感器，包括壳体、探头和电气部分，其特征在于，所述电气部分设置在所述壳体内，所述电气部分包括检测单元、电路板、显示单元、外部控制单元，所述检测单元包括温度检测单元、流量检测单元，所述温度检测单元、流量检测单元安装于所述探头内；
    所述壳体包括，耐酸碱金属制备的外壳，以及绝缘材质制备的固定支架，所述固定支架嵌设于所述外壳的内腔中，所述固定支架具有用于安装所述电路板的安装部及容纳所述电路板的腔体。
  2. 根据权利要求1所述的抗酸碱全金属流量温度传感器，其特征在于，所述电路板包括至少独立的两块，所述固定支架的腔体为相互独立密封的上腔体和下腔体，所述电路板分别设置于所述上腔体和下腔体中，所述上下腔体中电路板之间的连接线通过以下结构设置：
    所述上下腔体上一体预埋连接线或金属柱，所述上下腔体中的电路板通过所述连接线连接，或在电路板上设置触点，所述上下腔体中的电路板通过所述触点与对应的金属柱接触而实现电连接；
    或在上下腔体之间的隔板上设置通孔及密封胶圈，再设置一条连接线穿过所述通孔及密封胶圈，所述上下腔体中的电路板通过所述连接线连接。
  3. 根据权利要求1所述的抗酸碱全金属流量温度传感器，其特征在于，设置于所述电路板上的电路包括：
    输入端与所述温度检测单元输出端连接的温度滤波电路；所述温度滤波电路的输出信号输入给中央处理电路进行处理；
    输入端与流量检测单元输出端连接的差动放大器、输入端与所述差动放大器输出端连接流量滤波电路；所述流量滤波电路的输出信号输入给中央处理电路进行处理；
    作为数据处理器的中央处理电路，所述中央处理电路设有温度漂移补偿电路和电压范围学习电路；
    D/A转换电路，所述D/A转换电路的输入端与所述中央处理电路的 一个输出端连接，所述电压范围学习电路为所述D/A转换电路提供数字基准信号，所述D/A转换电路的输出端与基准电压模块的输入端连接，所述D/A转换电路将数字基准信号转换为模拟基准信号给基准电压模块；
    基准电压模块，其输出端与所述差动放大器连接，所述基准电压模块将模拟基准信号处理后，为差动放大器提供基准电压；
    显示驱动电路，其输入端与所述中央处理电路连接，其输出端分别设有温度输出端和流量输出端；所述显示驱动电路还设有陀螺仪或重力感应装置，可以根据需要，调整温度显示电路和流量显示电路上数字显示的方向；
    所述显示单元包括：
    温度显示电路，其输入端与所述温度输出端连接，并显示对应的温度检测信息；
    流量显示电路，其输入端与所述流量输出端连接，并显示对应的流量检测信息；所述温度检测单元、流量检测单元分别采集被测量介质的温度信号、流量信号传输到所述中央处理电路，经处理后数据分别通过所述温度显示电路、流量显示电路输出和/或显示数值信号。
  4. 根据权利要求3所述的抗酸碱全金属流量温度传感器，其特征在于，所述电路还包括：
    温度输出电路，其输入端与所述中央处理电路连接，其输出端与输出保护电路的一个输入端连接；
    流量输出电路，其输入端与所述中央处理电路连接，其输出端与输出保护电路的另一个输入端连接；
    输出保护电路，其输出端与所述中央处理电路的一个输入端连接，如果温度信号和/或流量信号超过设定值，将触发中央处理电路启动设置于其内部的保护电路。
  5. 根据权利要求4所述的抗酸碱全金属流量温度传感器，其特征在于，在所述壳体上还设有用于连接外部电缆的接插件，所述接插件包括固定于所述外壳上的连接部和一体密封封装于所述外壳上并位于所述连 接部设有的腔体中的金属触点，所述金属触点由金属柱制成，并贯穿所述外壳与固定支架，并与所述电路板对应连接，所述外部电缆通过与所述连接部匹配的连接头活动连接，同时使外部电缆的各信号线与所述金属触点一一对应电连接，所述连接部是一个带法兰的中空圆柱，所述法兰用于将连接部固定在外壳上，所述圆柱的腔体将金属触点罩住，圆柱上设有用于与外部电缆的接插头匹配连接的螺纹或卡扣，所述金属触点位于外壳外部的一侧的端面低于所述外壳的外表面，即每个金属触点都设置在一个圆形凹坑中，与之对应，安装于外部电缆上的接插件上的金属探针，所述金属探针设有密封部件，所述密封部件为所述金属探针的柱体上包裹的绝缘防水的材料，所述金属探针的顶端端面裸露，当所述金属探针一一对应***所述金属触点所在的凹坑时，其端面与所述金属触点电连接，其密封部件的一部分与所述凹坑外壁过盈配合，从而达到密封的目的。
  6. 根据权利要求4所述的抗酸碱全金属流量温度传感器，其特征在于，所述中央处理电路分别对应流量输出和温度输出产生两路监控信号，当所述监控信号的输出类型为开关量输出时，通过NPN三极管、PNP三极管、或继电器输出，当所述监控信号的输出类型为模拟量输出时，输出电流为4～20mA、输出电压为0～10V。
  7. 根据权利要求1所述的抗酸碱全金属流量温度传感器，其特征在于，所述壳体包括上盖和下盖，所述下盖设有上部卡槽和下部卡槽2个卡槽，所述上部卡槽设有密封圈，所述下部卡槽设有密封垫，上盖与下盖通过过盈配合密封。
  8. 根据权利要求7所述的抗酸碱全金属流量温度传感器，其特征在于，所述固定支架设置于所述上盖中，所述固定支架为2个对称的塑胶件，所述塑胶件呈半椭圆状，在半椭圆的内壁上设有卡口，用来固定所述电路板，起到防振、屏蔽、抗干扰的作用。
  9. 根据权利要求7所述的抗酸碱全金属流量温度传感器，其特征在于，所述探头包括探棒和连接螺母，所述下盖中间设有圆孔，圆孔向下延伸有一个凸台，所述探棒穿过下盖中间的圆孔，通过过盈配合并用固 定螺母固定。
  10. 根据权利要求9所述的抗酸碱全金属流量温度传感器，其特征在于，所述探棒顶部设有一个圆孔，所述圆孔中安装有用于增强产品抗干扰能力接地线，所述圆孔孔径≤1.5mm；优选的，所述探棒顶部设有台阶，台阶上设有密封圈，密封圈在探棒与下盖配合时起到密封的作用，探棒上设有2个卡槽，上部的卡槽通过与连接螺母间隙配合，再用卡簧固定；下部卡槽上设有密封圈，起到防水作用。
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