High-precision nuclear-grade pressure transmitter

Abstract

The present invention discloses a high-precision nuclear-grade pressure transmitter, comprising a detection end housing, an electric control housing connected to the detection end housing, the electric control housing being connected to a signal connection terminal; a sensor chamber is formed inside the detection end housing, a pressure sensor is placed in the sensor chamber; a circuit chamber is formed inside the electric control housing, a transmitter signal processing circuit is placed in the circuit chamber, and the transmitter signal processing circuit is connected to the pressure sensor via a pressure sensor adapter circuit. Beneficial effect: When the transmitter with a secret passage design is interfered with by a nuclear radiation signal, the radiation signal can be effectively weakened in the secret passage to ensure that the internal circuit of the transmitter is not interfered with, so that the pressure transmitter can accurately detect the measured value, so that the transmitter still has high accuracy, strong reliability, long service life and strong practicality in special environments such as the nuclear industry.

Description

Technical Field

[0001] The present invention relates to the field of transmitters, in particular to a high-precision nuclear-grade pressure transmitter. Background Art

[0002] With the development of modern industry, pressure transmitters are being used more and more frequently in modern industry. As their applications become more widespread, the requirements for pressure transmitters are becoming higher and higher. This requires that pressure transmitters can accurately detect process parameters and transmit the measured values in the form of specific signals under different environments.

[0003] However, in special environments such as nuclear radiation, the transmission lines inside the pressure transmitter need to be opened to arrange the lines. In order to save paths and reduce line layout, multi-hole coaxial and other settings are generally used. Since nuclear radiation signals are easy to leak, arbitrary openings can easily cause radiation signals to enter the transmitter and radiate interference to the circuit, resulting in the pressure transmitter being unable to accurately detect the measurement value, and the detection accuracy and reliability are poor.

[0004] Transmitters designed for general environments have simple internal structures, and lack radiation protection features during wiring and structural design, making them incapable of meeting the detection requirements of special environments such as nuclear radiation. This results in transmitters with poor reliability, poor anti-interference capabilities, short service life, and limited practicality. Summary of the Invention

[0005] In response to the above problems, the present invention provides a high-precision nuclear-grade pressure transmitter that can accurately detect measured values without interference under special circumstances such as nuclear radiation, and has high detection accuracy and reliability.

[0006] In order to achieve the above object, the specific technical solutions adopted by the present invention are as follows:

[0007] A high-precision nuclear-grade pressure transmitter, characterized by comprising a detection end housing, an electric control housing connected to the detection end housing, and a signal connection terminal connected to the electric control housing;

[0008] A sensor chamber is formed inside the detection end housing, and a pressure sensor is placed in the sensor chamber;

[0009] A circuit chamber is formed inside the electronic control housing. A transmitter signal processing circuit is placed in the circuit chamber. The transmitter signal processing circuit is connected to the pressure sensor via a pressure sensor switching circuit.

[0010] Through the above design, the pressure sensor is placed inside the sensor chamber, and the circuit is placed inside the circuit chamber, which improves the signal processing accuracy and isolates the two chambers from each other. Based on the principle of linear propagation of radiation, nuclear radiation is weakened by partitioning.

[0011] Further description, the detection end shell includes a three-way welding sleeve, and the two opposite ends of the three-way welding sleeve are provided with sleeve covers, and a detection hole is respectively opened on the two sleeve covers, and the two detection holes are symmetrically arranged, and the detection holes are communicated with the sensor chamber; a detection signal input hole is opened on the side wall of the circuit chamber, and the detection signal input hole is communicated with the sensor chamber; the shell wall at the detection signal input hole of the electronic control shell protrudes outward in the circumferential direction along the extension direction of the detection signal input hole to form a ring-shaped sensor connection part, which is connected to the vertical end of the three-way welding sleeve, and forms a pressure sensor transfer circuit chamber at the vertical end of the three-way welding sleeve, and a pressure sensor transfer circuit chamber is provided in the pressure sensor transfer circuit chamber, and the pressure sensor transfer circuit chamber is communicated with the adjustment circuit chamber through the detection signal input hole of the electronic control shell; the pressure sensor transfer circuit is connected to the demodulation circuit and the voltage / current conversion circuit in sequence; the detection hole wall extends toward the sensor chamber to form a circle of sealing strips, and the sealing strips and the three-way welding sleeve form a sealing groove. Through the sealing groove, when the sensor is installed and sealed, the sealing ring and the fixing ring are sequentially arranged in the sealing groove to seal the circumference of the collection end of the sensor to prevent liquid from entering the instrument.

[0012] Using this solution, the sensor is placed inside the sensor chamber. A differential pressure signal is generated through multiple detection holes. This differential pressure signal is fed into the circuit board chamber of the electronic control housing through the detection signal input hole and output through the signal connection terminal. The detection, signal processing, and signal output components are designed as separate, independent chambers. Each chamber is isolated from the others, and based on the principle of linear radiation propagation, radiation is attenuated through zoning and isolation. Two symmetrically positioned detection holes are used to obtain different pressure values, thereby generating a differential pressure signal. A second adapter circuit board chamber is formed by the sensor connection and the vertical end of the three-way welding sleeve.

[0013] To further describe, the electronic control housing includes a meter housing and first and second housing end covers disposed at opposite ends of the meter housing. The first and second housing end covers are threadedly connected to the meter housing, with housing sealing rings disposed at the threaded connections. A raised ring is formed axially outward on the covering surfaces of the first and second housing end covers. A partition is radially disposed within the meter housing, dividing the circuit chamber into an adjustment circuit chamber and a control circuit chamber. A threading hole is formed on the partition. N raised strips protrude uniformly along the axial direction from the inner wall of the control circuit chamber. The detection signal input hole is disposed on the wall of the meter housing corresponding to the adjustment circuit chamber.

[0014] Using this solution, a partition divides the circuit chamber into two compartments, partitioning the two circuits and attenuating radiated signals. The demodulated circuit enters the control circuit board compartment through a threading hole. N is a positive integer. The ridges facilitate press-fitting the lead box during installation. The lead protective plate within the chamber provides enhanced radiation and interference resistance. The signal output is determined by the current flowing into the internal circuit of the cylinder. The signal output hole then powers the instrument and generates the detected differential pressure signal.

[0015] To further describe, there is a lead box in the control circuit chamber, and there is a radiation-proof transmitter secret passage in the lead box, and the interior of the lead box is connected to the sensor chamber through the transmitter secret passage; the lead box includes a lower protective plate of the meter head, and a meter head protective tube in the shape of a blind tube is provided on the protective surface side of the lower protective plate of the meter head; the meter head protective plate is provided on the end of the meter head protective tube away from the lower protective plate of the meter head, and the two are coaxially arranged; the protective surface of the lower protective plate of the meter head is provided with a groove, and the groove of the lower protective plate of the meter head is in contact with the bottom of the tube of the meter head protective tube to form a first transfer circuit chamber; the meter head protective tube and the meter head protective tube The protective plate surrounds the main circuit chamber; the protective plate under the meter head, the protective tube of the meter head and the protective plate on the meter head are all made of lead material; a first through-hole is opened at the bottom of the groove of the protective plate under the meter head, and a second through-hole is opened at the bottom of the protective tube of the meter head, and the first through-hole and the second through-hole are staggered; the first through-hole, the first transfer circuit chamber, the second through-hole, and the main circuit chamber are connected, and the path of the first through-hole, the first transfer circuit chamber, and the second through-hole forms a transmitter secret passage; the adjustment circuit chamber is connected to the first transfer circuit chamber through the second through-hole; the first transfer circuit chamber is connected to the main circuit chamber through the first through-hole.

[0016] With this solution, the transmitter's secret passageway must make multiple turns during transmission line routing before entering the main circuit chamber. When the lead box is placed in a radiation environment, the radiation signal is effectively weakened after making at least two turns—through the first via, the first transfer circuit chamber, and the second via. This multiple turns weakens the radiation energy.

[0017] Further description, the first through hole is arranged at the edge of the groove of the lower protective plate of the meter header, and the orthographic projection of the second through hole falls into the bottom of the groove of the lower protective plate of the meter header, and the orthographic projection of the second through hole is placed at the farthest end from the first through hole; a cylindrical surface inner support cylinder is placed in the main circuit chamber, and the structural shape of the surface inner support cylinder is adapted to the internal structural shape of the meter header protective cylinder, and the top cover of the surface inner support cylinder is provided with a meter header inner support plate, and the meter header inner support plate and the surface inner support cylinder form the main circuit chamber; the side wall of the groove of the lower protective plate of the meter header is provided with an installation step; a circle of raised portions is formed on the inner surface of the protective plate on the meter header, and the size of the raised portion is adapted to the size of the tube hole of the meter header protective cylinder; a circle of recessed portions is formed on the outer surface of the protective plate on the meter header.

[0018] With this solution, the position of the first via defines the input port of the first transfer circuit chamber, and the position of the second via defines the output port of the first transfer circuit chamber. The first and second vias are positioned on either side of the farthest end, maximizing the distance between them and extending the attenuation distance of the radiated signal. The distance at the farthest end is determined by the inner diameter of the groove. The raised and recessed portions of the protective plate on the meter head are designed to attenuate the radiated signal in the event of interference, thereby ensuring the quality of the protective box housing for the transmitter.

[0019] Further description, the transmitter signal processing circuit includes a demodulation circuit and a voltage / current conversion circuit, and the pressure sensor adapter circuit is connected to the demodulation circuit and the voltage / current conversion circuit in sequence; the demodulation circuit is connected to a temperature compensation circuit, a linear adjustment circuit and an oscillation control circuit; the connection line between the demodulation circuit and the voltage / current conversion circuit is connected to a zero point adjustment circuit; the output end of the voltage / current conversion circuit is connected to a voltage regulator; the voltage regulator is connected to the demodulation circuit; the adjustment circuit chamber is provided with the zero point adjustment circuit, the oscillation control circuit, the demodulation circuit, the temperature compensation circuit and the linear adjustment circuit; the main circuit chamber is provided with the voltage regulator and the voltage / current conversion circuit; the output end of the voltage / current conversion circuit is connected to one end of the first adapter circuit board inside the first adapter circuit chamber through the second via hole, and the other end of the first adapter circuit board is connected to the terminal block through the first via hole, the third via hole and the adjustment circuit chamber.

[0020] Using this solution, a linear adjustment circuit can be used to change the resistance of the potentiometer in the linear adjustment circuit, thereby varying the current and minimizing the error generated by the pressure transmitter. The zero adjustment circuit ensures that the lower limit of the transmitter's output signal corresponds to the lower limit of the measurement range. A voltage regulator stabilizes the generated voltage, effectively preventing damage to the circuit caused by spikes and sudden voltage changes.

[0021] To further describe, the demodulation circuit includes a first coupled inductor TIA, a second coupled inductor TIB, and a third coupled inductor TIC; the first coupled inductor TIA, the second coupled inductor TIB, and the third coupled inductor TIC are connected using like-named ends; a third capacitor C3 is connected between one end of the first coupled inductor TIA and one end of the second coupled inductor TIB, and one end of the first coupled inductor TIA and one end of the third capacitor C3 serve as the first input end of the demodulation circuit;

[0022] A fourth capacitor C4 is connected between one end of the second coupling inductor TIB and one end of the third coupling inductor TIC; one end of the fourth capacitor C4 is connected to the other end of the third capacitor C3, and the other end of the third capacitor C3 is connected to one end of the second coupling inductor TIB; one end of the second coupling inductor TIB and one end of the third capacitor C3 serve as the second input end of the demodulation circuit;

[0023] One end of the third coupled inductor TIC and the other end of the fourth capacitor C4 serve as a third input end of the demodulation circuit;

[0024] The first coupled inductor TIA is connected in parallel to the second capacitor C2; the other end of the first coupled inductor TIA is connected to one end of a twenty-ninth resistor R29; one end of the twenty-ninth resistor is connected to the second capacitor C2; the other end of the twenty-ninth resistor R29 is connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the other end of the third coupled inductor TIC;

[0025] The cathode of the second diode D2 and the anode of the first diode D1 are connected to one end of the first coupled inductor TIA via the first capacitor C1; the other end of the first coupled inductor TIA is connected to the non-inverting input end of the instrumentation amplifier in the demodulation circuit, and the other end of the third coupled inductor TIC is connected to the inverting input end of the instrumentation amplifier in the demodulation circuit; the non-inverting input end and the inverting input end of the instrumentation amplifier are connected to the twenty-first polarized capacitor C21; the non-inverting input end of the instrumentation amplifier in the demodulation circuit is connected to the power supply VCC via the fifteenth resistor R15; the non-inverting input end of the instrumentation amplifier in the demodulation circuit and the common end of the fifteenth resistor R15 are connected to one end of the fourteenth resistor R14 via the sixteenth resistor R16, and the other end of the fourteenth resistor R14 is connected to the power supply VCC via the thirteenth resistor R13; The common end of the fourth resistor R14 and the thirteenth resistor R13 is connected to the inverting input end of the instrumentation amplifier in the demodulation circuit, which is connected to the other end of the seventeenth capacitor C17, and one end of the seventeenth capacitor C17 is connected to the output end of the instrumentation amplifier in the demodulation circuit; the common end of the fourteenth resistor R14 and the sixteenth resistor R16 is connected to the output end of the amplitude control instrumentation amplifier, which is connected to the inverting input end of the amplitude control instrumentation amplifier; the non-inverting input end of the amplitude control instrumentation amplifier is connected to the power supply VCC via the seventeenth resistor R17, and the non-inverting input end of the amplitude control instrumentation amplifier and the common end of the seventeenth resistor R17 are connected to one end of an eighteenth resistor R18; the other end of the eighteenth resistor R18 serves as the demodulation output end of the demodulation circuit.

[0026] The above solution is used to adjust the signal frequency through a demodulation circuit.

[0027] To further describe, the oscillation control circuit includes a first transistor Q1, the base of which is connected to one end of an eleventh resistor R11, and the common end of the base of the first transistor Q1 and the eleventh resistor R11 is connected to one end of a seventh capacitor C7; the emitter of the first transistor Q1 is connected to one end of a fourth coupled inductor TID; the other end of the fourth coupled inductor TID is connected to the other end of the seventh capacitor C7 via the common end of a twelfth resistor R12; the collector of the first transistor Q1 is connected to one end of a fifth coupled inductor TIE; the other end of the eleventh resistor R11 and the other end of the fifth coupled inductor TIE are connected to a power supply VCC; the same-name ends of the fourth coupled inductor TID and the fifth coupled inductor TIE are connected in series with a sixth capacitor C6, and the twelfth resistor R12 is connected to the output end of the instrumentation amplifier of the demodulation circuit;

[0028] The linear adjustment circuit includes a third potentiometer PP3, the third potentiometer PP3 is connected to the other end of the twenty-ninth resistor R29 in the demodulation circuit with a resistance terminal and to the other end of the second resistor R2 in the demodulation circuit with a sliding terminal;

[0029] The temperature compensation circuit includes a thermistor Rt, one end of the thermistor Rt is connected in parallel with one end of the first resistor R1, and the common end of the thermistor Rt and the first resistor R1 is connected to one end of a negative resistor R-; one end of the negative resistor R- is connected to the common end of a fourteenth resistor R14 and a sixteenth resistor R16 in the demodulation circuit; one end of the negative resistor R- is connected to one end of a positive resistor R+, and the other end of the positive resistor R+ is connected to a power supply VCC; the thermistor Rt is connected to one end of a fifth capacitor C5, and the other end of the fifth capacitor C5 is connected to one end of a seventeenth resistor R17; the other end of the thermistor Rt and the other end of the first resistor R1 are connected to the other end of a second coupled inductor TIB;

[0030] The voltage stabilizing source includes a first series voltage stabilizing diode Z1, which is composed of an anode of a voltage stabilizing diode Z11 and an anode of a voltage stabilizing diode Z12 connected together; the cathode of the voltage stabilizing diode Z12 is connected to a fifth resistor R5, which is connected to the first port of the first terminal block; the common end of the fifth resistor R5 and the cathode of the voltage stabilizing diode Z12 is connected to a power supply VCC; the common end of the anode of the voltage stabilizing diode Z12 and the anode of the voltage stabilizing diode Z11 is connected to one end of a nineteenth resistor R19, which is connected to one end of a twentieth resistor R20, and the other end of the nineteenth resistor R19 is connected to the demodulation output end of the demodulation circuit; the nineteenth resistor R19 The other end of the Zener diode Z11 is connected to one end of the twenty-first resistor R21, the other end of the twenty-first resistor R21 is connected to the twenty-third resistor R23 and then to ground; the common end of the twenty-first resistor R21 and the twenty-third resistor R23 is connected to one end of the twenty-second resistor R22, the other end of the twenty-second resistor R22 is connected to the other end of the twentieth resistor R20, the cathode of the Zener diode Z11 is connected to the anode of the fifth diode D5, the cathode of the fifth diode is connected to one end of the twenty-second resistor R22; the common end of the anode of the fifth diode D5 and the cathode of the Zener diode Z11 is connected to the voltage / current conversion circuit; the cathode of the fifth diode D5 is connected to the base of the fourth transistor Q4 in the voltage / current conversion circuit;

[0031] The zero-point adjustment circuit includes a fifth potentiometer PP5, a sliding end of the fifth potentiometer PP5 connected to one end of the eighth resistor R8, one resistance end of the fifth potentiometer PP5 connected to one end of the third resistor R3 and one end of the fourth resistor R4, one end of the fourth resistor R4 connected to the fourth terminal of the first terminal row; the other end of the fourth resistor R4 connected to the other end of the twentieth resistor R22; the other end of the resistance end of the fifth potentiometer PP5 connected to the twenty-fourth resistor R24; the other end of the third resistor R3 and the other end of the eighth resistor R8 connected to the other end of the sixth resistor R6; the other end of the sixth resistor R6 is connected to the other end of the second coupling inductor TIB.

[0032] In this solution, the oscillator circuit and demodulator circuit are combined to adjust the signal frequency. A voltage regulator stabilizes the generated voltage, effectively preventing damage to the circuit caused by spikes and sudden voltage changes. Changing the resistance of potentiometer PP3 in the linear adjustment circuit changes the current, minimizing the resulting error.

[0033] To further describe, the voltage / current conversion circuit includes a damping adjustment circuit and a range adjustment circuit; the range adjustment circuit includes a sixth potentiometer PP6, one end of the resistance end of the sixth potentiometer PP6 is connected to the cathode of the third diode D3, and the anode of the third diode D3 is connected to the first terminal of the third terminal row; the other end of the resistance end of the sixth potentiometer PP6 is connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is connected to the power supply VCC; the sliding end of the sixth potentiometer PP6 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor is connected to one end of the thirty-fourth resistor R34, and the other end of the thirty-fourth resistor R34 is connected to the resistance end of the fourth potentiometer PP4. The thirty-fifth resistor R35 is connected to the non-inverting input terminal of the instrumentation amplifier of the damping adjustment circuit; the potential terminal of the fourth potentiometer PP4 is connected to one end of the fifteenth capacitor C15, the other end of the fifteenth capacitor C15 is connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is connected to the sliding terminal of the sixth potentiometer PP6; the inverting input terminal of the instrumentation amplifier of the damping adjustment circuit is connected to the twenty-sixth resistor R26 and the twenty-fourth resistor R24 in sequence; the output terminal of the instrumentation amplifier of the damping adjustment circuit is connected to one end of the twenty-seventh resistor R27, the other end of the twenty-seventh resistor R27 is connected to the second transistor Q2 in the signal loop; the sixth potentiometer PP6 is connected to the voltage / current conversion circuit;

[0034] The cathode of the third diode D3 is connected to the ninth resistor R9, the tenth resistor R10, and the twenty-eighth resistor R28 in sequence. One end of the twenty-eighth resistor R28 is connected to the cathode of the sixth voltage-stabilizing diode D6. The anode of the sixth voltage-stabilizing diode D6 is connected to the second terminal of the third terminal row. The other end of the twenty-eighth resistor R28 is connected to the anode of the third diode D3. The cathode of the third diode D3 is connected to the anode of the fourth diode D4. The cathode of the fourth diode D4 is connected to the emitter of the second transistor Q2. The base of the second transistor Q2 is connected to one end of the twenty-seventh resistor R27. The other end of the twenty-seventh resistor R27 is connected to the output end of the instrumentation amplifier of the voltage / current conversion circuit. The twenty-seventh resistor R27 is connected to the output end of the instrumentation amplifier of the voltage / current conversion circuit. One end of resistor R27 is connected to one end of a nineteenth polarized capacitor C19, the other end of which is connected to a power supply VCC; one end of the nineteenth polarized capacitor C19 is connected to one end of a twentieth polarized capacitor C20; the emitter of the second transistor Q2 is connected to the other end of the twentieth polarized capacitor C20; the collector of the second transistor Q2 is connected to the base of the third transistor Q3, the emitter of the third transistor Q3 is connected to terminal No. 2 of the third terminal row, the base of the third transistor Q3 and the second terminal of the third terminal row are connected to a sixteenth capacitor C16; the second terminal of the third terminal row is connected to the anode of a sixth voltage stabilizing diode D6, the cathode of the sixth voltage stabilizing diode D6 is connected to the power supply VCC;

[0035] The cathode of the fourth diode D4 is connected to the collector of the fourth transistor Q4, and the emitter of the fourth transistor Q4 is connected to one end of the thirty-third resistor R33; the other end of the thirty-third resistor R33 is connected to the base of the fifth transistor Q5, and the collector of the fifth transistor Q5 is connected to the common end of the emitter of the fourth transistor Q4 and the collector of the third transistor Q3; the emitter of the fourth transistor is grounded; the common end of the other end of the thirty-third resistor R33 and the base of the fifth transistor Q5 is connected to the cathode of the eighth voltage-stabilizing diode D8, and the anode of the eighth voltage-stabilizing diode D8 is connected to the second terminal of the third terminal row; the emitter of the fifth transistor Q5 is connected to one end of the thirty-second resistor R32, and the other end of the thirty-second resistor R32 is connected to the second terminal of the third terminal row.

[0036] In this scheme, the purpose of changing the resistance value of potentiometer PP5 in the zero-point adjustment circuit is to change the differential pressure, so that the lower limit of the transmitter output signal corresponds to the lower limit of the measurement range. When the amplification factor changes, the range also needs to be adjusted. The resistance value of potentiometer PP6 is changed so that the upper limit of the transmitter output signal corresponds to the upper limit of the measurement range.

[0037] To further describe, the signal connection end includes a signal output hole connected in sequence to the aviation socket base, the connector socket and the connector plug; the side wall of the circuit chamber is also provided with a signal output hole; the bottom of the aviation socket base is docked with the signal output hole; the shell wall at the signal output hole protrudes outward circumferentially along the extension direction of the signal output hole to form a ring-shaped signal output connection part; the signal output connection part is connected to the aviation socket base, and the connection at the bottom of the aviation socket base forms a terminal circuit chamber, and the terminal circuit chamber places the terminal row.

[0038] The beneficial effects of the present invention are as follows: in response to the need for radiation protection in the nuclear industry, the shell structure is designed to partition the detection, signal processing, and signal output parts of the pressure differential transmitter, and the circuit layout is performed in the corresponding set chambers. At the same time, in response to the nuclear grade requirements, a radiation-proof control circuit board chamber is reserved for installing a radiation-proof lead box. Functional zoning, precise design, and good sealing effect. When the transmitter with a secret channel design is interfered with by a nuclear radiation signal, the radiation signal can be effectively weakened in the secret channel to ensure that the internal circuit of the transmitter is not interfered with, so that the pressure transmitter can accurately detect the measured value, so that the transmitter is still highly accurate, reliable, long-lasting, and practical in special environments such as the nuclear industry. The use of analog circuits has low power consumption during use in the nuclear industry and can meet the needs of different ranges. The change in pressure difference is judged by the amount of current consumed, thereby accurately measuring the corresponding value. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the three-dimensional structure of a high-precision nuclear-grade pressure transmitter;

[0040] Figure 2 This is an exploded view of a high-precision nuclear-grade pressure transmitter;

[0041] Figure 3 This is a cross-sectional view of the high-precision nuclear-grade pressure transmitter with the signal connection end disconnected;

[0042] Figure 4 yes Figure 3 Enlarged view of the middle part C;

[0043] Figure 5 yes Figure 3 Middle AA section view;

[0044] Figure 6 yes Figure 3 Middle BB cross-section;

[0045] Figure 7 It is a schematic diagram of the lead box structure;

[0046] Figure 8 This is the front view of the lead box;

[0047] Figure 9 yes Figure 8 Cross-section at AA in the middle;

[0048] Figure 10 This is a diagram showing the layout of the lines and the direction of the radiation signals of the present invention;

[0049] Figure 11 It is the circuit principle block diagram;

[0050] Figure 12 It is a circuit schematic. DETAILED DESCRIPTION

[0051] The specific implementation manner and working principle of the present invention will be further described in detail below with reference to the accompanying drawings.

[0052] A high-precision nuclear-grade pressure transmitter, combined with Figure 1 It can be seen that it includes a detection end housing 1, an electric control housing 2 connected to the detection end housing 1, and a signal connection terminal 3 connected to the electric control housing 2; a sensor chamber is formed inside the detection end housing 1, and a sensor is placed in the sensor chamber;

[0053] A circuit chamber is formed inside the electronic control housing 2 , in which a transmitter signal processing circuit is placed. The transmitter signal processing circuit is connected to the pressure sensor via a pressure sensor switching circuit.

[0054] from Figure 2 It can be seen that the detection end housing 1 includes a three-way welding sleeve 12, and the two ends facing the three-way welding sleeve 12 are each provided with a sleeve cover, and the two sleeve covers are respectively provided with a detection hole 11, and the two detection holes 11 are symmetrically arranged, and the detection holes 11 are communicated with the sensor chamber;

[0055] from Figure 5 It can be seen that a detection signal input hole 21 is opened on the side wall of the circuit chamber, and the detection signal input hole 21 is connected to the sensor chamber;

[0056] from Figure 2 、 Figure 5 and Figure 6 It can be seen that the shell wall at the detection signal input hole 21 of the electronic control housing 2 protrudes outward in the circumferential direction along the extension direction of the detection signal input hole 21 to form an annular sensor connecting part, and the sensor connecting part is connected to the vertical end of the three-way welding sleeve 12, and a pressure sensor transfer circuit chamber is formed at the vertical end of the three-way welding sleeve 12. A pressure sensor transfer circuit is arranged in the pressure sensor transfer circuit chamber, and the pressure sensor transfer circuit chamber is connected to the adjustment circuit chamber through the detection signal input hole 21 of the electronic control housing 2; the hole wall of the detection hole 11 extends toward the sensor chamber to form a circle of sealing strips, and the sealing strips and the three-way welding sleeve 12 form a sealing groove.

[0057] from Figure 2 It can also be seen that the electronic control housing 2 includes a meter housing 23 and a first housing end cover 24 and a second housing end cover 25 provided at both ends of the meter housing 23. The first housing end cover 24 and the second housing end cover 25 are both threadedly connected to the two ends of the meter housing 23, and a housing sealing ring 27 is provided at the threaded connection. A convex ring is formed on the covering surface of the first housing end cover 24 and the second housing end cover 25 in the axial direction outward.

[0058] from Figure 2 and Figure 5 As can be seen, a partition 26 is radially disposed within the meter housing 23, dividing the circuit chamber into an adjustment circuit chamber and a control circuit chamber. The detection signal input port 21 is located on the wall of the meter housing 23 corresponding to the adjustment circuit chamber. Within the control circuit chamber lies a lead box 50, which houses a radiation-proof transmitter tunnel. This tunnel connects the interior of the lead box 50 to the sensor chamber.

[0059] from Figure 7 、 Figure 8 and Figure 9 It can be seen that the lead box includes a meter head lower protective plate 51, and a meter head protective tube 53 in the shape of a blind tube is provided on the protective surface side of the meter head lower protective plate 51; a meter head protective plate 57 is provided on the end of the meter head protective tube 53 away from the meter head lower protective plate 51, and the two are coaxially arranged; a groove is provided on the protective surface of the meter head lower protective plate 51, and the groove of the meter head lower protective plate 51 abuts against the bottom of the meter head protective tube 53 to form a first switching circuit chamber; the meter head protective tube 53 and the meter head The upper protective plate 57 encloses the main circuit chamber; a first through-hole is formed at the bottom of the groove of the lower protective plate 51 of the meter head, and a second through-hole is formed at the bottom of the protective tube 53 of the meter head. The first through-hole and the second through-hole are arranged alternately; the first through-hole, the first transfer circuit chamber, the second through-hole, and the main circuit chamber are connected, and the path of the first through-hole, the first transfer circuit chamber, and the second through-hole forms a transmitter secret passage; the lower protective plate 51 of the meter head, the protective tube 53 of the meter head, and the protective plate 57 of the meter head are all made of lead material;

[0060] from Figure 2 and Figure 5 It can also be seen that a threading hole is opened on the partition 26; and 12 convex strips are uniformly protruded along the axial direction on the inner wall of the control circuit chamber.

[0061] from Figure 9It can be seen that the first through hole is arranged at the edge of the groove of the lower protective plate 51 of the meter header, and the orthographic projection of the second through hole falls into the bottom of the groove of the lower protective plate 51 of the meter header, and the orthographic projection of the second through hole is placed at the farthest end from the first through hole; a cylindrical surface inner support cylinder 54 is placed in the main circuit chamber, and the structural shape of the surface inner support cylinder 54 is adapted to the internal structural shape of the meter header protective cylinder 53, and the top of the surface inner support cylinder 54 is covered with a meter header inner support plate 56, and the meter header inner support plate 56 and the surface inner support cylinder 54 form the main circuit chamber; the side wall of the groove of the lower protective plate 51 of the meter header is provided with an installation step; a circle of raised portions is formed on the inner surface of the protective plate 57 on the meter header, and the size of the raised portion is adapted to the size of the tube hole of the meter header protective cylinder 53; a circle of recessed portions is formed on the outer surface of the protective plate 57 on the meter header.

[0062] The adjustment circuit chamber is communicated with the first switching circuit chamber via the second via hole; the first switching circuit chamber is communicated with the main circuit chamber via the first via hole.

[0063] from Figure 2 、 Figure 3 and Figure 4 As can be seen, the signal connection terminal 3 comprises a connector socket 32 and a connector plug 33, which are sequentially connected to an aviation socket base 31. A signal output hole 22 is also formed in the side wall of the circuit chamber. The bottom of the aviation socket base 31 is connected to the signal output hole 22. The shell wall at the signal output hole 22 protrudes outward along the extension direction of the signal output hole to form an annular signal output connection portion. The signal output connection portion is connected to the aviation socket base 31. The connection at the bottom of the aviation socket base 31 forms a terminal circuit chamber, which houses the terminals.

[0064] See also Figure 3 、 5 , 10 and Figure 11 The transmitter signal processing circuit includes a demodulation circuit and a voltage / current conversion circuit. The pressure sensor adapter circuit is connected to the demodulation circuit and the voltage / current conversion circuit in sequence; the demodulation circuit is connected to a temperature compensation circuit, a linear adjustment circuit and an oscillation control circuit; a zero point adjustment circuit is connected to the connection line between the demodulation circuit and the voltage / current conversion circuit; the output end of the voltage / current conversion circuit is connected to a voltage regulator; the voltage regulator is connected to the demodulation circuit; the adjustment circuit chamber is provided with the zero point adjustment circuit, the oscillation control circuit, the demodulation circuit, the temperature compensation circuit and the linear adjustment circuit; the main circuit chamber is provided with the voltage regulator and the voltage / current conversion circuit; the output end of the voltage / current conversion circuit is connected to one end of the first adapter circuit board inside the first adapter circuit chamber through the second via hole, and the other end of the first adapter circuit board is connected to the terminal block through the first via hole, the third via hole and the adjustment circuit chamber.

[0065] See also Figure 11 and 12 The pressure sensor adapter circuit includes a first port, a second port, and a third port connected to the pressure sensor. The first port is connected to the anode of the third series diode D03 via the eleventh capacitor C11. The cathode of the third series diode D03 is connected to one end of the second series diode R02 via the first equalizing resistor R01. The other end of the second equalizing resistor R02 is connected to the anode of the fourth series diode D04. The cathode of the fourth series diode D04 is connected to the second port via the twelfth capacitor C12. The common end of the twelfth capacitor C12 and the fourth series diode D04 is connected to the anode of the second series diode D02. The cathode of the second series diode D02 is connected to the cathode of the second series diode D02. Connect the anode of the first series diode D01; the common end of the third series diode D03 and the eleventh capacitor C11 is connected to the cathode of the first series diode D01; the third port is connected to the thirteenth capacitor C13, connected to the twenty-second capacitor C22 and grounded; the common end of the third series diode D03 and the first voltage-equalizing resistor R01 serves as the first output end of the pressure sensor adapter circuit; the common end of the first series diode D01 and the second series diode D02 serves as the second output end of the pressure sensor adapter circuit; the common end of the second voltage-equalizing resistor R02 and the fourth series diode D04 serves as the third output end of the pressure sensor adapter circuit.

[0066] from Figure 12It can also be seen that the demodulation circuit includes a first coupled inductor TIA, a second coupled inductor TIB, and a third coupled inductor TIC; the first coupled inductor TIA, the second coupled inductor TIB, and the third coupled inductor TIC are connected with the same end; a third capacitor C3 is connected between one end of the first coupled inductor TIA and one end of the second coupled inductor TIB, and one end of the first coupled inductor TIA and one end of the third capacitor C3 serve as the first input end of the demodulation circuit; a fourth capacitor C4 is connected between one end of the second coupled inductor TIB and one end of the third coupled inductor TIC; one end of the fourth capacitor C4 is connected to the other end of the third capacitor C3, and the other end of the third capacitor C3 is connected to the second coupled inductor TIB. One end of the inductor TIB; one end of the second coupled inductor TIB and one end of the third capacitor C3 serve as the second input end of the demodulation circuit; one end of the third coupled inductor TIC and the other end of the fourth capacitor C4 serve as the third input end of the demodulation circuit; the first coupled inductor TIA is connected in parallel with the second capacitor C2; the other end of the first coupled inductor TIA is connected to one end of the twenty-ninth resistor R29; one end of the twenty-ninth resistor is connected to the second capacitor C2; the other end of the twenty-ninth resistor R29 is connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to one end of the second resistor R2, and the second resistor R2 The other end of the second diode D2 is connected to the other end of the third coupling inductor TIC; the common end of the cathode of the second diode D2 and the anode of the first diode D1 is connected to one end of the first coupling inductor TIA via the first capacitor C1; the other end of the first coupling inductor TIA is connected to the non-inverting input end of the instrumentation amplifier in the demodulation circuit, and the other end of the third coupling inductor TIC is connected to the inverting input end of the instrumentation amplifier in the demodulation circuit; the non-inverting input end and the inverting input end of the instrumentation amplifier are connected to the twenty-first polar capacitor C21; the non-inverting input end of the instrumentation amplifier in the demodulation circuit is connected to the power supply VCC via the fifteenth resistor R15; the non-inverting input end of the instrumentation amplifier in the demodulation circuit is connected to the fifteenth resistor R15 The common end is connected to one end of a fourteenth resistor R14 via a sixteenth resistor R16, and the other end of the fourteenth resistor R14 is connected to a power supply VCC via a thirteenth resistor R13; the common end of the fourteenth resistor R14 and the thirteenth resistor R13 is connected to an inverting input end of an instrumentation amplifier in the demodulation circuit, which is connected to the other end of a seventeenth capacitor C17, and one end of the seventeenth capacitor C17 is connected to the output end of the instrumentation amplifier in the demodulation circuit; the common end of the fourteenth resistor R14 and the sixteenth resistor R16 is connected to the output end of an amplitude control instrumentation amplifier, which is connected to the inverting input end of the amplitude control instrumentation amplifier;The non-inverting input terminal of the amplitude control instrumentation amplifier is connected to the power supply VCC via the seventeenth resistor R17. The common terminal of the non-inverting input terminal of the amplitude control instrumentation amplifier and the seventeenth resistor R17 is connected to one end of the eighteenth resistor R18. The other end of the eighteenth resistor R18 serves as the demodulation output terminal of the demodulation circuit.

[0067] from Figure 12 It can also be seen that the oscillation control circuit includes a first transistor Q1, the base of which is connected to one end of an eleventh resistor R11, and the common end of the base of the first transistor Q1 and the eleventh resistor R11 is connected to one end of a seventh capacitor C7; the emitter of the first transistor Q1 is connected to one end of a fourth coupled inductor TID; the other end of the fourth coupled inductor TID is connected to the other end of the seventh capacitor C7 via the common end of a twelfth resistor R12; the collector of the first transistor Q1 is connected to one end of a fifth coupled inductor TIE; the other end of the eleventh resistor R11 and the other end of the fifth coupled inductor TIE are connected to a power supply VCC; the same-named ends of the fourth coupled inductor TID and the fifth coupled inductor TIE are connected in series with a sixth capacitor C6, and the twelfth resistor R12 is connected to the output end of the instrumentation amplifier of the demodulation circuit;

[0068] from Figure 12 It can also be seen that the linear adjustment circuit includes a third potentiometer PP3, the third potentiometer PP3 is connected to the other end of the twenty-ninth resistor R29 in the demodulation circuit with a resistance terminal and to the other end of the second resistor R2 in the demodulation circuit with a sliding terminal;

[0069] from Figure 12 It can also be seen that the temperature compensation circuit includes a thermistor Rt, one end of which is connected in parallel to one end of the first resistor R1, and the common end of the thermistor Rt and the first resistor R1 is connected to one end of a negative resistor R-; one end of the negative resistor R- is connected to the common end of the fourteenth resistor R14 and the sixteenth resistor R16 in the demodulation circuit; one end of the negative resistor R- is connected to one end of the positive resistor R+, and the other end of the positive resistor R+ is connected to the power supply VCC; the thermistor Rt is connected to one end of the fifth capacitor C5, and the other end of the fifth capacitor C5 is connected to one end of the seventeenth resistor R17; the other end of the thermistor Rt and the other end of the first resistor R1 are connected to the other end of the second coupling inductor TIB;

[0070] from Figure 12It can also be seen that the voltage stabilizing source includes a first series voltage stabilizing diode Z1, which is composed of an anode of a voltage stabilizing diode Z11 and an anode of a voltage stabilizing diode Z12 connected together; the cathode of the voltage stabilizing diode Z12 is connected to a fifth resistor R5, and the fifth resistor R5 is connected to the first port of the first terminal block; the common end of the fifth resistor R5 and the cathode of the voltage stabilizing diode Z12 is connected to the power supply VCC; the common end of the anode of the voltage stabilizing diode Z12 and the anode of the voltage stabilizing diode Z11 is connected to one end of a nineteenth resistor R19, one end of the nineteenth resistor R19 is connected to one end of a twentieth resistor R20, and the other end of the nineteenth resistor R19 is connected to the demodulation output end of the demodulation circuit; the nineteenth resistor The other end of R19 is connected to one end of a twenty-first resistor R21, the other end of the twenty-first resistor R21 is connected to a twenty-third resistor R23 and then to ground; the common end of the twenty-first resistor R21 and the twenty-third resistor R23 is connected to one end of a twenty-second resistor R22, the other end of the twenty-second resistor R22 is connected to the other end of the twentieth resistor R20; the cathode of the Zener diode Z11 is connected to the anode of a fifth diode D5, the cathode of the fifth diode is connected to one end of the twenty-second resistor R22; the common end of the anode of the fifth diode D5 and the cathode of the Zener diode Z11 is connected to the voltage / current conversion circuit; the cathode of the fifth diode D5 is connected to the base of a fourth transistor Q4 in the voltage / current conversion circuit;

[0071] from Figure 12 It can also be seen that the zero-point adjustment circuit includes a fifth potentiometer PP5, a sliding end of the fifth potentiometer PP5 is connected to one end of the eighth resistor R8, one resistance end of the fifth potentiometer PP5 is connected to one end of the third resistor R3 and one end of the fourth resistor R4, one end of the fourth resistor R4 is connected to the fourth terminal of the first terminal row; the other end of the fourth resistor R4 is connected to the other end of the twentieth resistor R22; the other end of the resistance end of the fifth potentiometer PP5 is connected to the twenty-fourth resistor R24; the other end of the third resistor R3 and the other end of the eighth resistor R8 are connected to the other end of the sixth resistor R6; the other end of the sixth resistor R6 is connected to the other end of the second coupling inductor TIB.

[0072] from Figure 12It can also be seen that the voltage / current conversion circuit includes a damping adjustment circuit and a range adjustment circuit; the range adjustment circuit includes a sixth potentiometer PP6, one end of the resistance end of the sixth potentiometer PP6 is connected to the cathode of the third diode D3, and the anode of the third diode D3 is connected to the first terminal of the third terminal row; the other end of the resistance end of the sixth potentiometer PP6 is connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is connected to the power supply VCC; the sliding end of the sixth potentiometer PP6 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor is connected to one end of the thirty-fourth resistor R34, and the other end of the thirty-fourth resistor R34 is connected to the resistance end of the fourth potentiometer PP4 and the first resistor R10. The thirty-fifth resistor R35 is connected to the non-inverting input terminal of the instrumentation amplifier of the damping adjustment circuit; the potential terminal of the fourth potentiometer PP4 is connected to one end of the fifteenth capacitor C15, the other end of the fifteenth capacitor C15 is connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is connected to the sliding terminal of the sixth potentiometer PP6; the inverting input terminal of the instrumentation amplifier of the damping adjustment circuit is connected to the twenty-sixth resistor R26 and the twenty-fourth resistor R24 in sequence; the output terminal of the instrumentation amplifier of the damping adjustment circuit is connected to one end of the twenty-seventh resistor R27, the other end of the twenty-seventh resistor R27 is connected to the second transistor Q2 in the signal loop; the sixth potentiometer PP6 is connected to the voltage / current conversion circuit;

[0073] The cathode of the third diode D3 is connected to the ninth resistor R9, the tenth resistor R10, and the twenty-eighth resistor R28 in sequence. One end of the twenty-eighth resistor R28 is connected to the cathode of the sixth voltage-stabilizing diode D6. The anode of the sixth voltage-stabilizing diode D6 is connected to the second terminal of the third terminal row. The other end of the twenty-eighth resistor R28 is connected to the anode of the third diode D3. The cathode of the third diode D3 is connected to the anode of the fourth diode D4. The cathode of the fourth diode D4 is connected to the emitter of the second transistor Q2. The base of the second transistor Q2 is connected to one end of the twenty-seventh resistor R27. The other end of the twenty-seventh resistor R27 is connected to the output end of the instrumentation amplifier of the voltage / current conversion circuit. The twenty-seventh resistor R27 is connected to the output end of the instrumentation amplifier of the voltage / current conversion circuit. One end of resistor R27 is connected to one end of a nineteenth polarized capacitor C19, the other end of which is connected to a power supply VCC; one end of the nineteenth polarized capacitor C19 is connected to one end of a twentieth polarized capacitor C20; the emitter of the second transistor Q2 is connected to the other end of the twentieth polarized capacitor C20; the collector of the second transistor Q2 is connected to the base of the third transistor Q3, the emitter of the third transistor Q3 is connected to terminal No. 2 of the third terminal row, the base of the third transistor Q3 and the second terminal of the third terminal row are connected to a sixteenth capacitor C16; the second terminal of the third terminal row is connected to the anode of a sixth voltage stabilizing diode D6, the cathode of the sixth voltage stabilizing diode D6 is connected to the power supply VCC;

[0074] The cathode of the fourth diode D4 is connected to the collector of the fourth transistor Q4, and the emitter of the fourth transistor Q4 is connected to one end of the thirty-third resistor R33; the other end of the thirty-third resistor R33 is connected to the base of the fifth transistor Q5, and the collector of the fifth transistor Q5 is connected to the common end of the emitter of the fourth transistor Q4 and the collector of the third transistor Q3; the emitter of the fourth transistor is grounded; the common end of the other end of the thirty-third resistor R33 and the base of the fifth transistor Q5 is connected to the cathode of the eighth voltage-stabilizing diode D8, and the anode of the eighth voltage-stabilizing diode D8 is connected to the second terminal of the third terminal row; the emitter of the fifth transistor Q5 is connected to one end of the thirty-second resistor R32, and the other end of the thirty-second resistor R32 is connected to the second terminal of the third terminal row.

Claims

1. A high-precision nuclear-grade pressure transmitter, characterized by: It comprises a detection end housing (1), an electric control housing (2) connected to the detection end housing (1), the electric control housing (2) being connected to a signal connection terminal (3), the signal connection terminal (3) comprising a connection terminal (31), a connector socket (32) and a connector plug (33) connected in sequence; A sensor chamber is formed inside the detection end housing (1), and a pressure sensor is placed in the sensor chamber; A circuit chamber is formed inside the electric control housing (2), a transmitter signal processing circuit is placed in the circuit chamber, and the transmitter signal processing circuit is connected to the pressure sensor via a pressure sensor switching circuit; The electric control housing (2) includes a meter housing (23), wherein a partition (26) is radially arranged inside the meter housing (23), and the partition (26) divides the circuit chamber into an adjustment circuit chamber and a control circuit chamber; A lead box (50) is provided in the control circuit chamber, wherein a radiation-proof transmitter secret passage is provided in the lead box (50), and the interior of the lead box (50) is communicated with the sensor chamber via the transmitter secret passage; The lead box includes a meter head lower protection plate (51), and a meter head protection tube (53) in the shape of a blind tube is provided on the protection surface side of the meter head lower protection plate (51); a meter head protection plate (57) is provided on the end of the meter head protection tube (53) away from the meter head lower protection plate (51), and the two are coaxially arranged; The protective surface of the meter head lower protective plate (51) is provided with a groove, and the groove of the meter head lower protective plate (51) abuts against the bottom of the meter head protective tube (53) to form a first switching circuit chamber; the meter head protective tube (53) and the meter head upper protective plate (57) form a main circuit chamber; the meter head lower protective plate (51), the meter head protective tube (53) and the meter head upper protective plate (57) are all made of lead material; A first through hole is formed at the bottom of the groove of the meter head lower protective plate (51), and a second through hole is formed at the bottom of the meter head protective tube (53), and the first through hole and the second through hole are arranged alternately; the first through hole, the first transfer circuit chamber, the second through hole, and the main circuit chamber are connected, and the path of the first through hole, the first transfer circuit chamber, and the second through hole forms a transmitter secret passage; The adjustment circuit chamber is communicated with the first switching circuit chamber via the second via hole; the first switching circuit chamber is communicated with the main circuit chamber via the first via hole.

2. The high-precision nuclear-grade pressure transmitter according to claim 1, characterized in that: The detection end housing (1) comprises a three-way welding sleeve (12), and the two opposite ends of the three-way welding sleeve (12) are both provided with sleeve covers, and the two sleeve covers are respectively provided with a detection hole (11), and the two detection holes (11) are symmetrically arranged, and the detection holes (11) are communicated with the sensor chamber; A detection signal input hole (21) is provided on the side wall of the circuit chamber, and the detection signal input hole (21) is communicated with the sensor chamber; The shell wall at the detection signal input hole (21) of the electric control housing (2) protrudes outward in the circumferential direction along the extension direction of the detection signal input hole (21) to form an annular sensor connection portion, the sensor connection portion is connected to the vertical end of the three-way welding sleeve (12), and the vertical end of the three-way welding sleeve (12) is surrounded to form a pressure sensor switching circuit chamber; the pressure sensor switching circuit is arranged in the pressure sensor switching circuit chamber, and the pressure sensor switching circuit chamber is communicated with the adjustment circuit chamber through the detection signal input hole (21) of the electric control housing (2); The pressure sensor adapter circuit includes a first port, a second port, and a third port connected to the pressure sensor. The first port is connected to the anode of the third series-connected diode D03 via the eleventh capacitor C11. The cathode of the third series-connected diode D03 is connected to one end of the second series-connected resistor R02 in turn via the first equalizing resistor R01. The other end of the second equalizing resistor R02 is connected to the anode of the fourth series-connected diode D04. The cathode of the fourth series-connected diode D04 is connected to the second port via the twelfth capacitor C12. The common end of the twelfth capacitor C12 and the fourth series-connected diode D04 is connected to the anode of the second series-connected diode D02, and the cathode of the second series-connected diode D02 is connected to the anode of the first series-connected diode D01. The common end of the third series-connected diode D03 and the eleventh capacitor C11 is connected to the cathode of the first series-connected diode D01. The third port is connected to the thirteenth capacitor C13, connected to the twenty-second capacitor C22, and grounded. The common end of the third series-connected diode D03 and the first voltage-uniforming resistor R01 serves as the first output end of the pressure sensor switching circuit; The common end of the first series-connected diode D01 and the second series-connected diode D02 serves as the second output end of the pressure sensor switching circuit; The common end of the second voltage-equalizing resistor R02 and the fourth series-connected diode D04 serves as the third output end of the pressure sensor switching circuit; The wall of the detection hole (11) extends toward the sensor chamber to form a circle of sealing strips, and the sealing strips and the three-way welding sleeve (12) form a sealing groove; The detection signal input hole (21) is provided on the wall of the meter housing (23) corresponding to the adjustment circuit chamber.

3. The high-precision nuclear-grade pressure transmitter according to claim 2, characterized in that: The electronic control housing (2) further comprises a first housing end cover (24) and a second housing end cover (25) provided at both ends of the meter housing barrel (23); the first housing end cover (24) and the second housing end cover (25) are both threadedly connected to both ends of the meter housing barrel (23); a housing sealing ring (27) is provided at the threaded connection; a convex ring is formed on the covering surface of the first housing end cover (24) and the second housing end cover (25) in the axial direction outward; The partition (26) is provided with a threading hole; and the inner wall of the control circuit chamber is provided with N convex strips protruding uniformly in the axial direction.

4. The high-precision nuclear-grade pressure transmitter according to claim 2, characterized in that: The first through hole is arranged at the edge of the groove of the meter head lower protective plate (51), and the orthographic projection of the second through hole falls into the bottom of the groove of the meter head lower protective plate (51), and the orthographic projection of the second through hole is located at the farthest end from the first through hole; A cylindrical surface inner support cylinder (54) is placed in the main circuit chamber. The structural shape of the surface inner support cylinder (54) is adapted to the internal structural shape of the meter head protection cylinder (53). The top cover of the surface inner support cylinder (54) is provided with a meter head inner support plate (56). The meter head inner support plate (56) and the surface inner support cylinder (54) enclose the main circuit chamber. The side wall of the groove of the meter head lower protective plate (51) is provided with a mounting step; A circle of raised portions is formed on the inner surface of the meter head protection plate (57), and the size of the raised portions is adapted to the size of the bore of the meter head protection tube (53); A circle of recessed portions is formed on the outer surface of the meter head protection plate (57).

5. The high-precision nuclear-grade pressure transmitter according to claim 2, characterized in that: The transmitter signal processing circuit includes a demodulation circuit and a voltage / current conversion circuit. The pressure sensor adapter circuit is connected to the demodulation circuit and the voltage / current conversion circuit in sequence. The demodulation circuit is connected to a temperature compensation circuit, a linear adjustment circuit, and an oscillation control circuit. A zero point adjustment circuit is connected to the connection line between the demodulation circuit and the voltage / current conversion circuit. The output end of the voltage / current conversion circuit is connected to a voltage stabilizing source. The voltage stabilizing source is connected to the demodulation circuit. The adjustment circuit chamber is provided with the zero point adjustment circuit, the oscillation control circuit, the demodulation circuit, the temperature compensation circuit and the linear adjustment circuit; The main circuit chamber is provided with the voltage stabilizing source and the voltage / current conversion circuit; The output end of the voltage / current conversion circuit is connected to one end of the first adapter circuit board inside the first adapter circuit chamber through the second via hole, and the other end of the first adapter circuit board is connected to the terminal block through the first via hole, the third via hole, and the adjustment circuit chamber.

6. The high-precision nuclear-grade pressure transmitter according to claim 5, characterized in that: The demodulation circuit includes a first coupled inductor TIA, a second coupled inductor TIB, and a third coupled inductor TIC; the first coupled inductor TIA, the second coupled inductor TIB, and the third coupled inductor TIC are connected with like-named ends; a third capacitor C3 is connected between one end of the first coupled inductor TIA and one end of the second coupled inductor TIB, and one end of the first coupled inductor TIA and one end of the third capacitor C3 serve as a first input end of the demodulation circuit; A fourth capacitor C4 is connected between one end of the second coupling inductor TIB and one end of the third coupling inductor TIC; one end of the fourth capacitor C4 is connected to the other end of the third capacitor C3, and the other end of the third capacitor C3 is connected to one end of the second coupling inductor TIB; one end of the second coupling inductor TIB and one end of the third capacitor C3 serve as the second input end of the demodulation circuit; One end of the third coupled inductor TIC and the other end of the fourth capacitor C4 serve as a third input end of the demodulation circuit; The first coupled inductor TIA is connected in parallel to the second capacitor C2; the other end of the first coupled inductor TIA is connected to one end of a twenty-ninth resistor R29; one end of the twenty-ninth resistor is connected to the second capacitor C2; the other end of the twenty-ninth resistor R29 is connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the other end of the third coupled inductor TIC; A common end of the cathode of the second diode D2 and the anode of the first diode D1 is connected to one end of the first coupling inductor TIA via the first capacitor C1; The other end of the first coupled inductor TIA is connected to the non-inverting input end of the instrumentation amplifier in the demodulation circuit, and the other end of the third coupled inductor TIC is connected to the inverting input end of the instrumentation amplifier in the demodulation circuit; the non-inverting input end and the inverting input end of the instrumentation amplifier are connected to the twenty-first polarized capacitor C21; the non-inverting input end of the instrumentation amplifier in the demodulation circuit is connected to the power supply VCC via the fifteenth resistor R15; the non-inverting input end of the instrumentation amplifier in the demodulation circuit and the common end of the fifteenth resistor R15 are connected to one end of the fourteenth resistor R14 via the sixteenth resistor R16, and the other end of the fourteenth resistor R14 is connected to the power supply VCC via the thirteenth resistor R13; the common end of the fourteenth resistor R14 and the thirteenth resistor R13 is connected to the demodulation circuit The inverting input terminal of the instrument amplifier in the demodulation circuit is connected to the inverting input terminal of the instrument amplifier in the demodulation circuit, the inverting input terminal of the instrument amplifier in the demodulation circuit is connected to the other end of the seventeenth capacitor C17, and one end of the seventeenth capacitor C17 is connected to the output end of the instrument amplifier in the demodulation circuit; the common end of the fourteenth resistor R14 and the sixteenth resistor R16 is connected to the output end of the amplitude control instrument amplifier, and the output end of the amplitude control instrument amplifier is connected to the inverting input end of the amplitude control instrument amplifier; the non-inverting input end of the amplitude control instrument amplifier is connected to the power supply VCC via the seventeenth resistor R17, and the non-inverting input end of the amplitude control instrument amplifier and the common end of the seventeenth resistor R17 are connected to one end of an eighteenth resistor R18; the other end of the eighteenth resistor R18 serves as the demodulation output end of the demodulation circuit.

7. The high-precision nuclear-grade pressure transmitter according to claim 6, characterized in that: The oscillation control circuit includes a first transistor Q1, a base of the first transistor Q1 connected to one end of an eleventh resistor R11, a common end of the base of the first transistor Q1 and the eleventh resistor R11 connected to one end of a seventh capacitor C7; an emitter of the first transistor Q1 connected to one end of a fourth coupled inductor TID; the other end of the fourth coupled inductor TID connected to the other end of the seventh capacitor C7 via the common end of a twelfth resistor R12; a collector of the first transistor Q1 connected to one end of a fifth coupled inductor TIE; the other end of the eleventh resistor R11 and the other end of the fifth coupled inductor TIE connected to a power supply VCC; a sixth capacitor C6 connected in series to the same-named ends of the fourth coupled inductor TID and the fifth coupled inductor TIE; and the twelfth resistor R12 connected to the output end of the instrumentation amplifier of the demodulation circuit. The linear adjustment circuit includes a third potentiometer PP3, the third potentiometer PP3 is connected to the other end of the twenty-ninth resistor R29 in the demodulation circuit with a resistance terminal and to the other end of the second resistor R2 in the demodulation circuit with a sliding terminal; The temperature compensation circuit includes a thermistor Rt, one end of the thermistor Rt is connected in parallel with one end of the first resistor R1, and the common end of the thermistor Rt and the first resistor R1 is connected to one end of a negative resistor R-; one end of the negative resistor R- is connected to the common end of a fourteenth resistor R14 and a sixteenth resistor R16 in the demodulation circuit; one end of the negative resistor R- is connected to one end of a positive resistor R+, and the other end of the positive resistor R+ is connected to a power supply VCC; the thermistor Rt is connected to one end of a fifth capacitor C5, and the other end of the fifth capacitor C5 is connected to one end of a seventeenth resistor R17; the other end of the thermistor Rt and the other end of the first resistor R1 are connected to the other end of a second coupled inductor TIB; The voltage stabilizing source includes a first series voltage stabilizing diode Z1, which is composed of an anode of a voltage stabilizing diode Z11 and an anode of a voltage stabilizing diode Z12 connected together; the cathode of the voltage stabilizing diode Z12 is connected to a fifth resistor R5, which is connected to the first port of the first terminal block; the common end of the fifth resistor R5 and the cathode of the voltage stabilizing diode Z12 is connected to a power supply VCC; the common end of the anode of the voltage stabilizing diode Z12 and the anode of the voltage stabilizing diode Z11 is connected to one end of a nineteenth resistor R19, which is connected to one end of a twentieth resistor R20, and the other end of the nineteenth resistor R19 is connected to the demodulation output end of the demodulation circuit; the nineteenth resistor R19 The other end of the Zener diode Z11 is connected to one end of the twenty-first resistor R21, the other end of the twenty-first resistor R21 is connected to the twenty-third resistor R23 and then to ground; the common end of the twenty-first resistor R21 and the twenty-third resistor R23 is connected to one end of the twenty-second resistor R22, the other end of the twenty-second resistor R22 is connected to the other end of the twentieth resistor R20, the cathode of the Zener diode Z11 is connected to the anode of the fifth diode D5, the cathode of the fifth diode is connected to one end of the twenty-second resistor R22; the common end of the anode of the fifth diode D5 and the cathode of the Zener diode Z11 is connected to the voltage / current conversion circuit; the cathode of the fifth diode D5 is connected to the base of the fourth transistor Q4 in the voltage / current conversion circuit; The zero-point adjustment circuit includes a fifth potentiometer PP5, a sliding end of the fifth potentiometer PP5 connected to one end of the eighth resistor R8, one resistance end of the fifth potentiometer PP5 connected to one end of the third resistor R3 and one end of the fourth resistor R4, one end of the fourth resistor R4 connected to the fourth terminal of the first terminal row; the other end of the fourth resistor R4 connected to the other end of the twentieth resistor R22; the other end of the resistance end of the fifth potentiometer PP5 connected to the twenty-fourth resistor R24; the other end of the third resistor R3 and the other end of the eighth resistor R8 connected to the other end of the sixth resistor R6; the other end of the sixth resistor R6 is connected to the other end of the second coupling inductor TIB.

8. The high-precision nuclear-grade pressure transmitter according to claim 6, characterized in that: The voltage / current conversion circuit includes a damping adjustment circuit and a range adjustment circuit; the range adjustment circuit includes a sixth potentiometer PP6, one end of the resistance end of the sixth potentiometer PP6 is connected to the cathode of the third diode D3, and the anode of the third diode D3 is connected to the first terminal of the third terminal row; the other end of the resistance end of the sixth potentiometer PP6 is connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is connected to the power supply VCC; the sliding end of the sixth potentiometer PP6 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor is connected to one end of the thirty-fourth resistor R34, and the other end of the thirty-fourth resistor R34 is connected to the resistance end of the fourth potentiometer PP4 and the thirty-fifth resistor R34. Resistor R35 is connected to the non-inverting input terminal of the instrumentation amplifier of the damping adjustment circuit; the potential terminal of the fourth potentiometer PP4 is connected to one end of the fifteenth capacitor C15, the other end of the fifteenth capacitor C15 is connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is connected to the sliding terminal of the sixth potentiometer PP6; the inverting input terminal of the instrumentation amplifier of the damping adjustment circuit is connected to the twenty-sixth resistor R26 and the twenty-fourth resistor R24 in sequence; the output terminal of the instrumentation amplifier of the damping adjustment circuit is connected to one end of the twenty-seventh resistor R27, the other end of the twenty-seventh resistor R27 is connected to the second transistor Q2 in the signal loop; the sixth potentiometer PP6 is connected to the voltage / current conversion circuit; The cathode of the third diode D3 is connected to the ninth resistor R9, the tenth resistor R10, and the twenty-eighth resistor R28 in sequence. One end of the twenty-eighth resistor R28 is connected to the cathode of the sixth voltage-stabilizing diode D6. The anode of the sixth voltage-stabilizing diode D6 is connected to the second terminal of the third terminal row. The other end of the twenty-eighth resistor R28 is connected to the anode of the third diode D3. The cathode of the third diode D3 is connected to the anode of the fourth diode D4. The cathode of the fourth diode D4 is connected to the emitter of the second transistor Q2. The base of the second transistor Q2 is connected to one end of the twenty-seventh resistor R27. The other end of the twenty-seventh resistor R27 is connected to the output end of the instrumentation amplifier of the voltage / current conversion circuit. The twenty-seventh resistor R27 is connected to the output end of the instrumentation amplifier of the voltage / current conversion circuit. One end of resistor R27 is connected to one end of a nineteenth polarized capacitor C19, the other end of which is connected to a power supply VCC; one end of the nineteenth polarized capacitor C19 is connected to one end of a twentieth polarized capacitor C20; the emitter of the second transistor Q2 is connected to the other end of the twentieth polarized capacitor C20; the collector of the second transistor Q2 is connected to the base of the third transistor Q3, the emitter of the third transistor Q3 is connected to terminal No. 2 of the third terminal row, the base of the third transistor Q3 and the second terminal of the third terminal row are connected to a sixteenth capacitor C16; the second terminal of the third terminal row is connected to the anode of a sixth voltage stabilizing diode D6, the cathode of the sixth voltage stabilizing diode D6 is connected to the power supply VCC; The cathode of the fourth diode D4 is connected to the collector of the fourth transistor Q4, and the emitter of the fourth transistor Q4 is connected to one end of the thirty-third resistor R33; the other end of the thirty-third resistor R33 is connected to the base of the fifth transistor Q5, and the collector of the fifth transistor Q5 is connected to the common end of the emitter of the fourth transistor Q4 and the collector of the third transistor Q3; the emitter of the fourth transistor is grounded; the common end of the other end of the thirty-third resistor R33 and the base of the fifth transistor Q5 is connected to the cathode of the eighth voltage-stabilizing diode D8, and the anode of the eighth voltage-stabilizing diode D8 is connected to the second terminal of the third terminal row; the emitter of the fifth transistor Q5 is connected to one end of the thirty-second resistor R32, and the other end of the thirty-second resistor R32 is connected to the second terminal of the third terminal row.

9. The high-precision nuclear-grade pressure transmitter according to claim 1, characterized in that: A signal output hole (22) is also provided on the side wall of the circuit chamber; the bottom of the aviation socket base (31) is connected to the signal output hole (22); the shell wall at the signal output hole (22) protrudes outward in the circumferential direction along the extension direction of the signal output hole to form a ring-shaped signal output connection part; the signal output connection part is connected to the aviation socket base (31), and the connection at the bottom of the aviation socket base (31) forms a terminal circuit chamber, and the terminal circuit chamber is used to place a terminal row.

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