CN214748596U - Pressure transmitter - Google Patents
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- CN214748596U CN214748596U CN202023342353.XU CN202023342353U CN214748596U CN 214748596 U CN214748596 U CN 214748596U CN 202023342353 U CN202023342353 U CN 202023342353U CN 214748596 U CN214748596 U CN 214748596U
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Abstract
The utility model discloses a pressure transmitter, which comprises a tubular electric control shell, wherein two end parts of the electric control shell are respectively connected with an end cover, and an adjusting circuit and a control circuit are arranged in the electric control shell; the side wall of the electric control shell is connected with a detection bobbin, a pressure sensor switching circuit is arranged in the detection bobbin, a signal sending end of the detection bobbin is communicated with the inside of the electric control shell, a signal sending end of the detection bobbin is connected with a pressure sensor detection end sealing shell, the side wall of the electric control shell is connected with a signal connection end head, and the signal connection end head is communicated with the inside of the electric control shell; the pressure sensor detection end sealing shell comprises a pressure sensor protection shell and a pressure sensor sealing structure shell arranged inside the pressure sensor protection shell. Has the advantages that: the design of the sub-cavity has good sealing effect, strong nuclear radiation resistance and high pressure detection precision.
Description
Technical Field
The utility model belongs to the technical field of the pressure sensor technique and specifically relates to a pressure transmitter.
Background
With the development of modern industry, pressure transmitters are applied to the modern industry more and more frequently. The pressure transmitter is required to be more and more widely applied, so that the pressure transmitter can accurately detect the process parameters and transmit the measured values in a specific signal form under different environments.
In the nuclear industry, due to problems of nuclear radiation, irradiation and the like, all adopted instruments are nuclear-grade equipment, and when the pressure sensor, particularly a differential pressure transmitter, is designed and installed, the service life of the pressure sensor is prolonged according to the nuclear-grade equipment. For example, some conventional transmissions fail to meet nuclear grade requirements during a pressure differential sensing operation. In the prior art, when people send a conventional transmitter into a nuclear reaction plant area for detection test, the fact that the sealing structure of the pressure sensor easily damages the sensor and influences the detection precision is found. And in the whole pressure detection process, due to the problem that the inner structure of the shell is not sealed, the damage caused by nuclear irradiation is large, so that the shell is easy to break down after being used for a period of time, or the detection has large deviation. However, due to the particularity of the installation environment, equipment replacement and installation are faced when faults occur, and radiation may exist in all operations due to the fact that the equipment belongs to the nuclear industry, so that the life safety of people is threatened. Therefore, it is necessary to design a transmitter housing suitable for the nuclear industry aiming at the use environment of the nuclear industry.
The transmitter with general environmental requirements has a simple internal structure, and circuits are all installed and placed by integrating a cavity, so that the detection requirements under special environments such as nuclear radiation and the like cannot be met. This leads to poor transmitter reliability, poor interference rejection, short service life, and poor practicality.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a pressure transmitter adopts seal structure to carry out seal installation to pressure sensor, and the circuit divides the function to divide the cavity installation, arranges rationally, improves and detects the precision.
In order to achieve the above purpose, the utility model adopts the following specific technical scheme:
a pressure transmitter, its key technology lies in: the device comprises a tubular electric control shell, wherein two end parts of the electric control shell are respectively connected with an end cover, and an adjusting circuit and a control circuit are arranged in the electric control shell;
the side wall of the electric control shell is connected with a detection bobbin, a pressure sensor switching circuit is arranged in the detection bobbin, a signal sending end of the detection bobbin is communicated with the inside of the electric control shell, a signal sending end of the detection bobbin is connected with a pressure sensor detection end sealing shell, and the side wall of the electric control shell is connected with a signal connecting end which is communicated with the inside of the electric control shell;
the pressure sensor detection end sealing shell comprises a pressure sensor protection shell and a pressure sensor sealing structure shell arranged in the pressure sensor protection shell.
By adopting the scheme, the circuit is installed in the sub-cavity, the pressure sensor is fixed in the sealed shell at the detection end of the pressure sensor, and the pressure signal is collected and then sent into the electric control shell through the detection bobbin. The pressure sensor detection end sealing shell is provided, and a more accurate pressure sensor mounting sealing structure is designed. The detection precision and the service cycle are effectively improved. And the electric control shell, the end cover, the detection bobbin and the pressure sensor detection end sealing shell are all made of lead box materials, so that the nuclear radiation prevention performance of the whole shell is effectively improved.
The further technical scheme is as follows: the pressure sensor sealing structure shell comprises a pressure sensor, a three-way welding sleeve and two templates, wherein the pressure sensor is fixed in the three-way welding sleeve to form a diaphragm capsule, the thickness of the pressure sensor is equal to the length of a transverse channel of the three-way welding sleeve, the end faces of two pressure detection ends of the diaphragm capsule are flush, the end faces of the two pressure detection ends of the diaphragm capsule are correspondingly abutted and sealed with the planes of the two templates, and a signal sending end of a detection barrel pipe extends into the pressure sensor detection end sealing shell and then is connected with a vertical through hole of the three-way welding sleeve; the two templates are connected through at least two bolts, and the distance between the two templates is equal to the length of the outer diameter of the vertical channel of the three-way welding sleeve.
By adopting the scheme, the end parts of the pressure sensor and the tee joint welding sleeve are mutually flushed, and are in plane butt joint when being clamped by two templates, the two end parts are welded and have equal acting force, the deviation and the asymmetry are not easy to occur, the welding is symmetrical finally, and the precision of the pressure sensor is small. And the end parts of the bellows formed by the pressure sensor and the three-way welding sleeve are flush, so that the two templates can share the acting force when being clamped, and the influence of the assembly stress of the sensor is reduced. The two templates firmly hold the bellows between them. Effectively avoiding the influence and the effect of external force on the internal welding part.
According to a further technical scheme, the template comprises an outer contact surface, an inner contact surface and a side surface, a membrane seat mounting groove is formed in the inner contact surface of the template, the end surface of a pressure detection end of the membrane box just extends into the membrane seat mounting groove, the transverse end surface of a three-way welding sleeve of the pressure detection end of the membrane box is abutted against the bottom of the membrane seat mounting groove, and the edge of the detection end of the pressure sensor is abutted against the bottom of the membrane seat mounting groove through an O-shaped ring; the template is internally provided with a pressure acquisition hole which is three through holes, the transverse through hole of the pressure acquisition hole penetrates through the side surface of the template, and the vertical hole of the pressure acquisition hole penetrates out of the bottom of the film seat mounting groove; and the pressure sensor protective shell is provided with shell pressure acquisition holes which correspond to the pressure acquisition holes on the side surface of the template one by one.
By adopting the scheme, the pressure sensor and the three-way welding sleeve form the diaphragm box, and the end part of the diaphragm box is integrally assembled in the groove through the diaphragm seat mounting groove. And the three-way welding sleeve is also welded in the groove. And the O-shaped ring is adopted for plane butt joint, so that the acting force of stress on the pressure sensor is reduced.
According to a further technical scheme, the pressure sensor comprises two pressure measurement components and a measurement diaphragm, wherein the two pressure measurement components are symmetrically connected to two measurement surfaces of the measurement diaphragm;
the pressure measuring assembly comprises a membrane seat, one surface of the membrane seat facing the measuring membrane is a concave arc surface, the concave arc surface of the membrane seat and the measuring membrane surround to form an oil cavity, isolation coatings are coated on the concave arc surfaces of the membrane seat, a signal oil pipe is embedded in the membrane seat, one end of the signal oil pipe penetrates through the isolation coatings to be communicated with the oil cavity, and the other end of the signal oil pipe penetrates out of the side wall of the membrane seat; the signal oil pipe is a hollow silicon oil pipe, the material of the signal oil pipe is a metal wire material, and the other end of the signal oil pipe is plugged by a weld scar;
one surface of the membrane seat, which is far away from the concave cambered surface, is connected with the plane end of the corrugated base;
one surface of the corrugated base, which is far away from the plane end of the corrugated base, is a corrugated surface, a positioning groove is formed in the corrugated surface of the corrugated base, an isolation diaphragm and a gasket ring are sequentially installed in the positioning groove from the bottom of the groove, the size of the positioning groove is matched with that of the isolation diaphragm and the gasket ring, the gasket ring covers the edge of the isolation diaphragm, and the O-shaped ring is abutted to the gasket ring;
and the diaphragm seat and the corrugated base are internally provided with a through pressure oil hole, one end of the pressure oil hole is communicated with the oil cavity, and the other end of the pressure oil hole is abutted to the isolation diaphragm.
By adopting the scheme, when pressure is applied to the pressure measurement assembly, the isolation diaphragm is applied with pressure, the internal oil body is extruded to move along the pressure oil hole so as to extrude the measurement diaphragm, and when pressure difference exists, the measurement diaphragm deviates left and right, so that the output signal of the signal oil pipe deviates, and a differential pressure signal is formed. The edge tip of constant head tank a week is directly used for butt template and welding, effectively avoids welding seam and isolation diaphragm contact. The influence of the welding seam on the isolation diaphragm of the pressure sensor is avoided. The signal oil pipe can be used for processing and oil filling of the pressure sensor, is used for oil filling of the pressure sensor, and can also be used for signal detection and transmission.
The bottom of the positioning groove is provided with a corrugated bottom surface arranged on the inner ring and a plane bottom surface of the outer ring, and the surface where the corrugated bottom surface is located is in a high-low corrugated shape from inside to outside; the isolation diaphragm comprises an inner ring of corrugated diaphragm and an outer ring of planar diaphragm, and the corrugated diaphragm of the isolation diaphragm is in a high-low corrugated shape from inside to outside; the corrugated diaphragm of the isolation diaphragm is correspondingly arranged on the corrugated bottom surface of the positioning groove, and the planar diaphragm of the isolation diaphragm is correspondingly arranged on the planar bottom surface of the positioning groove; the gasket ring is welded on the plane diaphragm of the isolation diaphragm.
Through the pressure sensor and the sealing structure of the pressure sensor, the stress effect on the sensor isolation diaphragm in the installation and assembly process is effectively reduced. And the problem that the detection precision of the pressure sensor has deviation due to asymmetric welding in the prior art is solved, and error superposition is avoided.
In a further technical scheme, for power supply and data detection, the signal connection end comprises an aviation socket base, a connector socket and a connector plug which are connected in sequence; the bottom of the aviation socket base is communicated with the control circuit board cavity.
According to a further technical scheme, the end face of the end part of the electric control shell is provided with three-level steps which are sequentially increased from the inner ring to the outer ring, the step faces of the three-level steps are a first end face step face, a second end face step face and a third end face step face from inside to outside, a circle of end cover convex ring is protruded in the end cover covering face of the end cover, the end cover convex ring table face of the end cover is just abutted to the first end face step face, the edge of the end cover covering face of the end cover is abutted to the third end face step face, and an end cover sealing ring is further arranged between the second end face step face and the end cover covering face of the end cover.
The end cover is abutted with the electric control shell, a gap exists between the end cover and the electric control shell, but an anti-radiation structure is formed through three steps, the gap is a turning gap, and the nuclear radiation signal can be reduced to the minimum after being vertically turned for many times. The electronic control shell can effectively shield or reduce the external nuclear radiation. The working period of the electronic circuit in the electric control chamber is prolonged. The end cap seal ring can isolate liquid ingress and the like.
In order to adjust circuits and the like in the electric control cavity, at least one adjusting hole is further formed in the side wall of the electric control shell, and an adjusting rod is arranged in the adjusting hole; an adjusting protective cover is further mounted on the outer wall of the electric control shell corresponding to the adjusting hole; a protective boss protrudes from the protective covering surface of the adjusting protective cover; the adjusting hole corresponds it has the level four step that reduces from outside to inside to open on the automatically controlled casing outer wall, the level face of level four step is first protection step face, second protection step face, third protection step face and fourth protection step face from inside to outside in proper order, first protection step face with adjusting hole inner wall connection, first protection step face is used for the joint the adjusting lever, second protection step face with protection boss mesa butt, fourth protection step face does automatically controlled casing outer wall, the protection covering face butt of adjustment visor is in on the fourth protection step face, third protection step face with be provided with the protection sealing washer between the protection covering face of adjustment visor.
Similarly, the four-stage steps are also designed for radiation protection.
According to a further technical scheme, the electric control shell is divided into a control circuit board cavity and an adjusting circuit board cavity through a partition plate; the control circuit board cavity is communicated with the signal connection end; the adjusting circuit board cavity is communicated with the detection bobbin; the adjusting circuit is fixed in the adjusting circuit board cavity through the adjusting circuit board; the control circuit is fixed in the control circuit board cavity through the control circuit board; the pressure sensor switching circuit is fixed on the detection bobbin through a pressure sensor switching circuit board.
By adopting the scheme, the electric control shell is divided into the control circuit board cavity and the adjusting circuit board cavity, the pressure sensor is fixed in the pressure sensor detection end sealing shell, each cavity is correspondingly provided with a circuit according to the circuit function, and the cavities are mutually independent. Each circuit board is fixedly installed through screws. Because the circuit is many, adopt a plurality of circuit boards to install respectively and integrate in the cavity.
The pressure sensor switching circuit comprises a first port, a second port and a third port which are connected with a pressure sensor, the first port is connected with the anode of a third series diode D03 through an eleventh capacitor C11, the cathode of the third series diode D03 is sequentially connected with one end of a second voltage equalizing resistor R02 through a first voltage equalizing resistor R01, the other end of the second voltage equalizing resistor R02 is connected with the anode of a fourth series diode D04, and the cathode of the fourth series diode D04 is connected with the second port through a twelfth capacitor C12; the anode of a second series diode D02 is connected to the common end of the twelfth capacitor C12 and the fourth series diode D04, and the cathode of the second series diode D02 is connected to the anode of the first series diode D01; the common end of the third series diode D03 and the eleventh capacitor C11 is connected with the cathode of the first series diode D01; the third port is connected with a thirteenth capacitor C13 and a twenty-second capacitor C22 which are grounded; the common end of the third series diode D03 and the first voltage-sharing resistor R01 is used as a first output end of the pressure sensor switching circuit; the common end of the first series diode D01 and the second series diode D02 is used as a second output end of the pressure sensor switching circuit; the common end of the second voltage-sharing resistor R02 and the fourth series diode D04 is used as a third output end of the pressure sensor switching circuit.
The adjusting circuit comprises a zero adjusting circuit, an oscillation control circuit, a demodulation circuit, a temperature compensation circuit and the linear adjusting circuit;
the main control cavity is provided with a voltage stabilizing source and the voltage/current conversion circuit;
the pressure sensor switching circuit is connected with the demodulation circuit, the demodulation circuit is connected with the voltage/current conversion circuit, the adjustment driving end of the demodulation circuit is further connected with the temperature compensation circuit and the linear adjustment circuit, and a zero point adjustment circuit is arranged on a connection line of the demodulation circuit and the voltage/current conversion circuit.
The demodulation circuit comprises a first coupling inductor TIA, a second coupling inductor TIB and a third coupling inductor TIC; the first coupling inductor TIA, the second coupling inductor TIB and the third coupling inductor TIC are connected by adopting homonymous terminals; a third capacitor C3 is connected between one end of the first coupling inductor TIA and one end of the second coupling inductor TIB, and one end of the first coupling inductor TIA and one end of the third capacitor C3 are used as first input ends in 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 a third capacitor C3 are used as a second input end of the demodulation circuit;
one end of the third coupling inductor TIC and the other end of the fourth capacitor C4 are used as a third input end of the demodulation circuit;
the first coupling inductor TIA is connected with a second capacitor C2 in parallel; the other end of the first coupling inductor TIA is connected with one end of a twenty-ninth resistor R29; one end of the twenty-ninth resistor is connected with a second capacitor C2; the other end of the twenty-ninth resistor R29 is connected to the anode of a second diode D2, the cathode of the second diode D2 is connected to the anode of a first diode D1, the cathode of the first diode D1 is connected to one end of a second resistor R2, and the other end of the second resistor R2 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 with one end of a first coupling inductor TIA through a first capacitor C1; the other end of the first coupling inductor TIA is connected with a positive phase input end of an instrument amplifier in the demodulation circuit, and the other end of the third coupling inductor TIC is connected with an inverted phase input end of the instrument amplifier in the demodulation circuit; the positive phase input end and the negative phase input end of the instrumentation amplifier are connected with a twenty-first active capacitance C21; the positive phase input end of the instrument amplifier in the demodulation circuit is connected with a power supply VCC through a fifteenth resistor R15; a non-inverting input end of an instrumentation amplifier in the demodulation circuit is connected with a common end of a fifteenth resistor R15 through a sixteenth resistor R16 and one end of a fourteenth resistor R14, and the other end of the fourteenth resistor R14 is connected with a power supply VCC through a thirteenth resistor R13; the common end of the fourteenth resistor R14 and the thirteenth resistor R13 is connected with the inverting input end of the instrumentation amplifier in the demodulation circuit, the inverting input end of the instrumentation amplifier in the demodulation circuit is connected with the other end of a seventeenth capacitor C17, and one end of the seventeenth capacitor C17 is connected with 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 with the output end of the amplitude control instrumentation amplifier, and the output end of the amplitude control instrumentation amplifier is connected with the inverting input end of the amplitude control instrumentation amplifier; the positive phase input end of the amplitude control instrument amplifier is connected with a power supply VCC through a seventeenth resistor R17, and the common end of the positive phase input end of the amplitude control instrument amplifier and a seventeenth resistor R17 is connected with one end of an eighteenth resistor R18; the other end of the eighteenth resistor R18 is used as the demodulation output end of the demodulation circuit.
The oscillation control circuit comprises a first triode Q1, the base electrode of the first triode Q1 is connected with one end of an eleventh resistor R11, and the common end of the base electrode of the first triode Q1 and the eleventh resistor R11 is connected with one end of a seventh capacitor C7; an emitter of the first triode Q1 is connected with one end of the fourth coupling inductor TID; the other end of the TID of the fourth coupling inductor is connected with the other end of the seventh capacitor C7 through the common end of a twelfth resistor R12; the collector of the first triode Q1 is connected with one end of a fifth coupling inductor TIE; the other end of the eleventh resistor R11 and the other end of the fifth coupling inductor TIE are connected with a power supply VCC; the dotted terminals of the fourth coupling inductor TID and the fifth coupling inductor TIE are connected with a sixth capacitor C6 in series, and the twelfth resistor R12 is connected with the output end of the demodulation circuit instrument amplifier;
the linear adjusting circuit comprises a third potentiometer PP3, wherein the resistance end of the third potentiometer PP3 is connected with the other end of a twenty-ninth resistor R29 in the demodulation circuit and the sliding end is connected with the other end of a second resistor R2 in the demodulation circuit;
the temperature compensation circuit comprises a thermistor Rt, one end of the thermistor Rt is connected with one end of a first resistor R1 in parallel, and the common end of the thermistor Rt, which is connected with the first resistor R1 in parallel, is connected with one end of a negative resistor R-; one end of the negative resistor R-is connected with 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 with one end of the positive resistor R +, and the other end of the positive resistor R + is connected with a power supply VCC; the thermistor Rt is connected with one end of a fifth capacitor C5, and the other end of the fifth capacitor C5 is connected with 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 with the other end of the second coupling inductor TIB;
the voltage regulator comprises a first series voltage stabilizing diode Z1, and the first series voltage stabilizing diode Z1 is formed by connecting the anode of a voltage stabilizing diode Z11 and the anode of a voltage stabilizing diode Z12; the cathode of the voltage stabilizing diode Z12 is connected with a fifth resistor R5, and the fifth resistor R5 is connected with the first port of the first terminal row; the common terminal of the fifth resistor R5 and the cathode of the zener diode Z12 is connected with a power supply VCC; the common end of the anode of the zener diode Z12 and the anode of the zener 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 other end of the nineteenth resistor R19 is connected with one end of a twenty-first resistor R21, and the other end of the twenty-first resistor R21 is connected with the twenty-third resistor R23 and then grounded; the common end of the twenty-first resistor R21 and the twenty-third resistor R23 is connected with one end of a twenty-second resistor R22, the other end of the twenty-second resistor R22 is connected with the other end of a twentieth resistor R20, the cathode of the zener diode Z11 is connected with the anode of a fifth diode D5, and the cathode of the fifth diode is connected with one end of a twenty-second resistor R22; the anode of the fifth diode D5 and the cathode of the Zener diode Z11 are connected with the voltage/current conversion circuit in common; the cathode of the fifth diode D5 is connected to the base of a fourth triode Q4 in the voltage/current conversion circuit;
the zero point adjusting circuit comprises a fifth potentiometer PP5, wherein the fifth potentiometer PP5 is in sliding termination with one end of an eighth resistor R8, the resistance end of the fifth potentiometer PP5 is connected with one ends of a third resistor R3 and a fourth resistor R4, and one end of a fourth resistor R4 is connected with the fourth terminal of the first terminal row; the other end of the fourth resistor R4 is connected with the other end of the resistor of the twentieth resistor R22; the other end of the resistance end of the fifth potentiometer PP5 is connected with a twenty-fourth resistor R24; the other end of the third resistor R3 and the other end of the eighth resistor R8 are connected with the other end of the sixth resistor R6; the other end of the sixth resistor R6 is coupled to the other end of the second coupling inductor TIB.
The voltage/current conversion circuit comprises a damping adjustment circuit and a range adjustment circuit; the range adjusting circuit comprises a sixth potentiometer PP6, one end of the resistance end of the sixth potentiometer PP6 is connected with the cathode of a third diode D3, and the anode of the third diode D3 is connected with the first terminal of the third terminal row; the other end of the resistor end of the sixth potentiometer PP6 is connected with one end of a tenth resistor R10, and the other end of the tenth resistor R10 is connected with a power supply VCC; the sliding end of the sixth potentiometer PP6 is connected to one end of a sixth resistor R6, the other end of the sixth resistor is connected to one end of a thirty-fourth resistor R34, and the other end of the thirty-fourth resistor R34 is connected to the non-inverting input end of the instrumentation amplifier of the damping adjustment circuit through the resistor end of the fourth potentiometer PP4 and the thirty-fifth resistor R35; the potential of the fourth potentiometer PP4 is connected to one end of a fifteenth capacitor C15, the other end of the fifteenth capacitor C15 is connected to one end of a seventh resistor R7, and the other end of the seventh resistor R7 is connected to the sliding end of the sixth potentiometer PP 6; the inverting input end of the instrument amplifier of the damping adjusting circuit is sequentially connected with a twenty-sixth resistor R26 and a twenty-fourth resistor R24; the output end of an instrumentation amplifier of the damping adjustment circuit is connected with one end of a twenty-seventh resistor R27, the other end of the twenty-seventh resistor R27 is connected with a second triode Q2 in a signal loop, and the sixth potentiometer PP6 is connected with a voltage/current conversion circuit;
the cathode of the third diode D3 is connected to a ninth resistor R9, a tenth resistor R10 and a twenty-eighth resistor R28 in sequence, one end of the twenty-eighth resistor R28 is connected to the cathode of a sixth zener diode D6, and the anode of the sixth zener diode D6 is connected to the second terminal of the third terminal row; the other end of the twenty-eighth resistor R28 is connected with the anode of a third diode D3, the cathode of the third diode D3 is connected with the anode of a fourth diode D4, the cathode of the fourth diode D4 is connected with the emitter of a second triode Q2, the base of the second triode Q2 is connected with one end of a twenty-seventh resistor R27, the other end of the twenty-seventh resistor R27 is connected with the output end of a voltage/current switching circuit instrument amplifier, one end of the twenty-seventh resistor R27 is connected with one end of a nineteenth polar capacitor C19, and the other end of the nineteenth polar capacitor C19 is connected with a power supply VCC; one end of the nineteenth active capacitor C19 is connected with one end of the twentieth active capacitor C20; an emitter of the second triode Q2 is connected with the other end of the twentieth active capacitor C20; a collector of the second triode Q2 is connected with a base of a third triode Q3, an emitter of the third triode Q3 is connected with a second terminal of a third terminal row, and lead-out circuits of the base of the third triode Q3 and the second terminal of the third terminal row are connected with a sixteenth capacitor C16; the second terminal of the third terminal row is connected with the anode of a sixth voltage-stabilizing diode D6, and the cathode of the sixth voltage-stabilizing diode D6 is connected with a 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 with the base electrode of a fifth triode Q5, and the collector electrode of the fifth triode Q5 is connected with the common end of the emitter electrode of the fourth triode Q4 and the collector electrode of the third triode Q3; an emitting electrode of the fourth triode is grounded; the common end of the other end of the thirty-third resistor R33 and the base of the fifth triode Q5 is connected with the cathode of an eighth zener diode D8, and the anode of the eighth zener diode D8 is connected with the second terminal of the third terminal row; an emitter of the fifth transistor Q5 is connected to one end of a 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.
The utility model has the advantages that: the pressure sensor and the sealing structure of the pressure sensor effectively reduce the stress effect on the sensor isolation diaphragm in the installation and assembly processes. And the problem that the detection precision of the pressure sensor has deviation due to asymmetric welding in the prior art is solved, and error superposition is avoided. The pressure sensor shell effectively improves the sealing performance of the installation of the pressure sensor and improves the detection precision. By adopting the above-described housing and stepped seal design. The effect of the core environment on the electronic circuitry inside the housing can be reduced.
Drawings
Fig. 1 is a schematic perspective view of the present invention;
fig. 2 is a left side view of the present invention;
FIG. 3 is a schematic cross-sectional view at E-E in FIG. 2;
FIG. 4 is an enlarged schematic view of C in FIG. 3;
fig. 5 is a right side view of the present invention;
FIG. 6 is a schematic cross-sectional view at F-F in FIG. 5;
fig. 7 is an enlarged schematic view of D in fig. 6.
FIG. 8 is a schematic structural view of a pressure sensor seal structure;
FIG. 9 is a front view of a pressure sensor seal structure;
FIG. 10 is a side view of a pressure sensor seal structure;
FIG. 11 is a cross-sectional view taken at A-A of FIG. 10 and an enlarged view of a portion of the cross-sectional view;
FIG. 12 is a schematic view of a pressure sensor configuration;
FIG. 13 is an exploded schematic view of the pressure sensor;
FIG. 14 is a side view of the pressure sensor;
fig. 15 is a sectional view taken at B-B in fig. 14.
Fig. 16 is a block diagram of the internal circuit of the present invention;
fig. 17 is a schematic diagram of the internal circuit of the present invention.
Detailed Description
The following provides a more detailed description of the embodiments and the operation of the present invention with reference to the accompanying drawings.
A pressure transmitter, see fig. 1 and fig. 2, comprises a tubular electric control housing 1, two end parts of the electric control housing 1 are respectively connected with an end cover 2, and an adjusting circuit and a control circuit are arranged in the electric control housing 1; a detection bobbin 4 is connected to the side wall of the electric control shell 1, a pressure sensor switching circuit is arranged in the detection bobbin 4, the signal sending end of the detection bobbin 4 is communicated with the inside of the electric control shell 1, the signal sending end of the detection bobbin 4 is connected with a pressure sensor detection end sealing shell 5, the side wall of the electric control shell 1 is connected with a signal connecting end 6, and the signal connecting end 6 is communicated with the inside of the electric control shell 1;
referring to fig. 8 and 11, the pressure sensor detection end seal housing 5 includes a pressure sensor protection housing 7 and a pressure sensor seal structure housing provided inside the pressure sensor protection housing 7.
Referring to fig. 8-11, the pressure sensor sealing structure shell comprises a pressure sensor Y, a three-way welding sleeve H and two templates M, the pressure sensor Y is fixed in the three-way welding sleeve H to form a capsule, the thickness of the pressure sensor Y is equal to the length of a transverse channel of the three-way welding sleeve H, the end faces of two pressure detection ends of the capsule are flush, the end faces of the two pressure detection ends of the capsule are correspondingly abutted and sealed with the planes of the two templates M, and a signal sending end of the detection bobbin 4 extends into the pressure sensor detection end sealing shell 5 and then is connected with a vertical through hole of the three-way welding sleeve H; in this embodiment, two templates M are connected by 4 bolts, and the distance between the two templates M is equal to the length of the outer diameter of the vertical channel of the three-way welding sleeve H.
In this embodiment, the template M includes an outer surface, an inner contact surface and a side surface, referring to fig. 11, the inner contact surface of the template M is provided with a membrane seat mounting groove, the end surface of the pressure detection end of the membrane cassette just extends into the membrane seat mounting groove, the transverse end surface of the three-way welding sleeve H of the pressure detection end of the membrane cassette abuts against the bottom of the membrane seat mounting groove, and the edge of the detection end of the pressure sensor Y abuts against the bottom of the membrane seat mounting groove through an O-ring; a pressure collecting hole is formed in the template M, and can be seen by combining the graph 9 and the graph 11, the pressure collecting hole is a three-through hole, the transverse through hole of the pressure collecting hole penetrates through the side surface of the template M, and the vertical hole of the pressure collecting hole penetrates through the bottom of the membrane seat mounting groove; referring to fig. 1, the pressure sensor protective shell 7 is provided with shell pressure collecting holes, and the shell pressure collecting holes correspond to the pressure collecting holes on the side surface of the template M one to one.
In the present embodiment, referring to fig. 13, 12 and 14, the pressure sensor Y includes two pressure measurement assemblies and a measurement diaphragm Y1, and the two pressure measurement assemblies are symmetrically connected to two measurement surfaces of the measurement diaphragm Y1;
in this embodiment, referring to fig. 13 and 15, the pressure measurement assembly includes a diaphragm seat Y2, one surface of the diaphragm seat Y2 facing the measurement diaphragm Y1 is a concave arc surface, the concave arc surface of the diaphragm seat Y2 and the measurement diaphragm Y1 surround to form an oil chamber Y3, the concave arc surfaces of the diaphragm seat Y2 are coated with an isolation coating Y4, the diaphragm seat Y2 is embedded with a signal oil pipe Y5, one end of the signal oil pipe Y5 passes through the isolation coating Y4 to communicate with the oil chamber Y3, and the other end of the signal oil pipe Y5 passes through the side wall of the diaphragm seat Y2; the signal oil pipe Y5 is a hollow silicon oil pipe and is made of a metal conducting wire, and the other end of the signal oil pipe Y5 is plugged by a crater;
referring to fig. 11, the side of the membrane seat Y2 away from the concave arc is connected with the flat end of the corrugated seat Y6;
referring to fig. 11 and 15, a surface of the corrugated base Y6, which is far away from the plane end thereof, is a corrugated surface, a positioning groove Y10 is formed in the corrugated surface of the corrugated base Y6, an isolation diaphragm Y7 and a gasket ring Y9 are sequentially installed in the positioning groove from the bottom of the groove, the size of the positioning groove is adapted to the size of the isolation diaphragm Y7 and the size of the gasket ring Y9, the gasket ring Y9 covers along the edge of the isolation diaphragm Y7, and the O-shaped ring abuts against the gasket ring Y9;
and a penetrating pressure oil hole Y8 is formed in the membrane seat Y2 and the corrugated base Y6, one end of the pressure oil hole Y8 is communicated with the oil cavity Y3, and the other end of the pressure oil hole Y8 is abutted against an isolation diaphragm Y7.
Referring to fig. 13 and 14, the bottom of the positioning groove Y10 is provided with a corrugated bottom surface arranged on the inner ring and a planar bottom surface arranged on the outer ring, and the surface of the corrugated bottom surface is in a corrugated shape from inside to outside; the isolation diaphragm Y7 comprises a corrugated diaphragm of an inner ring and a planar diaphragm of an outer ring, and the corrugated diaphragm of the isolation diaphragm Y7 is in a corrugated shape from inside to outside; the corrugated diaphragm of the isolating diaphragm Y7 is correspondingly arranged on the corrugated bottom surface of the positioning groove Y10, and the planar diaphragm of the isolating diaphragm Y7 is correspondingly arranged on the planar bottom surface of the positioning groove Y10; the gasket ring Y9 is welded to the planar diaphragm of the isolating diaphragm Y7.
Referring to fig. 3, the signal connection terminal 6 includes an aviation socket base 61, a connector socket 62 and a connector plug 63 which are connected in sequence; the bottom of the aviation socket base 61 is communicated with the control circuit board cavity 1 a.
As can be seen from fig. 3 and 4, the end face of the end of the electronic control housing 1 is provided with three steps which are sequentially increased from the inner ring to the outer ring, the step faces of the three steps are a first end face step face, a second end face step face and a third end face step face from inside to outside, a circle of end cover convex ring is protruded in the end cover covering face of the end cover 2, the end cover convex ring table face of the end cover 2 is just abutted to the first end face step face, the edge of the end cover covering face of the end cover 2 is abutted to the third end face step face, and an end cover sealing ring 8 is further arranged between the second end face step face and the end cover covering face of the end cover 2.
Referring to fig. 6 and 7, at least one adjusting hole is further formed in the side wall of the electronic control housing 1, and an adjusting rod 9 is disposed in the adjusting hole; an adjusting protective cover 10 is further mounted on the outer wall of the electric control shell 1 corresponding to the adjusting hole; referring to fig. 6, a protection boss protrudes from the protection covering surface of the adjustment protection cover 10; referring to fig. 7, the adjustment hole corresponds it has the level four step that reduces from outside to inside in proper order to open on the 1 outer wall of automatically controlled casing, the level face of level four step is first protection step face, second protection step face, third protection step face and fourth protection step face from inside to outside in proper order, first protection step face with adjustment hole inner wall connection, first protection step face is used for the joint adjusting lever 9, second protection step face with protection boss mesa butt, fourth protection step face does 1 outer wall of automatically controlled casing, the protection of adjustment visor 10 covers the face butt and is in on the fourth protection step face, third protection step face with be provided with protection sealing washer 11 between the protection face of adjustment visor 10.
Referring to fig. 3, the electronic control housing 1 is divided into a control circuit board chamber 1a and an adjusting circuit board chamber 1b by a partition plate; the control circuit board cavity 1a is communicated with the signal connection end 6; the adjusting circuit board cavity 1b is communicated with the detection bobbin 4; the adjusting circuit is fixed in the adjusting circuit board cavity 1b through an adjusting circuit board; the control circuit is fixed in the control circuit board cavity 1a through a control circuit board; the pressure sensor switching circuit is fixed on the detection bobbin 4 through a pressure sensor switching circuit board.
Specifically referring to fig. 17, the pressure sensor switching circuit includes a first port, a second port and a third port connected to the pressure sensor, the first port is connected to an anode of a third series diode D03 through an eleventh capacitor C11, a cathode of the third series diode D03 is sequentially connected to one end of a second voltage-sharing resistor R02 through a first voltage-sharing resistor R01, the other end of the second voltage-sharing resistor R02 is connected to an anode of a fourth series diode D04, and a cathode of the fourth series diode D04 is connected to the second port through a twelfth capacitor C12; the anode of a second series diode D02 is connected to the common end of the twelfth capacitor C12 and the fourth series diode D04, and the cathode of the second series diode D02 is connected to the anode of the first series diode D01; the common end of the third series diode D03 and the eleventh capacitor C11 is connected with the cathode of the first series diode D01; the third port is connected with a thirteenth capacitor C13 and a twenty-second capacitor C22 which are grounded; the common end of the third series diode D03 and the first voltage-sharing resistor R01 is used as a first output end of the pressure sensor switching circuit; the common end of the first series diode D01 and the second series diode D02 is used as a second output end of the pressure sensor switching circuit; the common end of the second voltage-sharing resistor R02 and the fourth series diode D04 is used as a third output end of the pressure sensor switching circuit.
As can be seen in fig. 16, the adjustment circuit includes a zero point adjustment circuit, an oscillation control circuit, a demodulation circuit, a temperature compensation circuit, and the linear adjustment circuit; the main control cavity is provided with a voltage stabilizing source and the voltage/current conversion circuit; the pressure sensor switching circuit is connected with the demodulation circuit, the demodulation circuit is connected with the voltage/current conversion circuit, the adjustment driving end of the demodulation circuit is further connected with the temperature compensation circuit and the linear adjustment circuit, and a zero point adjustment circuit is arranged on a connection line of the demodulation circuit and the voltage/current conversion circuit.
As can be seen in fig. 17, the demodulation circuit includes a first coupling inductor TIA, a second coupling inductor TIB, and a third coupling inductor TIC; the first coupling inductor TIA, the second coupling inductor TIB and the third coupling inductor TIC are connected by adopting homonymous terminals; a third capacitor C3 is connected between one end of the first coupling inductor TIA and one end of the second coupling inductor TIB, and one end of the first coupling inductor TIA and one end of the third capacitor C3 are used as first input ends in 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 a third capacitor C3 are used as a second input end of the demodulation circuit;
one end of the third coupling inductor TIC and the other end of the fourth capacitor C4 are used as a third input end of the demodulation circuit;
the first coupling inductor TIA is connected with a second capacitor C2 in parallel; the other end of the first coupling inductor TIA is connected with one end of a twenty-ninth resistor R29; one end of the twenty-ninth resistor is connected with a second capacitor C2; the other end of the twenty-ninth resistor R29 is connected to the anode of a second diode D2, the cathode of the second diode D2 is connected to the anode of a first diode D1, the cathode of the first diode D1 is connected to one end of a second resistor R2, and the other end of the second resistor R2 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 with one end of a first coupling inductor TIA through a first capacitor C1; the other end of the first coupling inductor TIA is connected with a positive phase input end of an instrument amplifier in the demodulation circuit, and the other end of the third coupling inductor TIC is connected with an inverted phase input end of the instrument amplifier in the demodulation circuit; the positive phase input end and the negative phase input end of the instrumentation amplifier are connected with a twenty-first active capacitance C21; the positive phase input end of the instrument amplifier in the demodulation circuit is connected with a power supply VCC through a fifteenth resistor R15; a non-inverting input end of an instrumentation amplifier in the demodulation circuit is connected with a common end of a fifteenth resistor R15 through a sixteenth resistor R16 and one end of a fourteenth resistor R14, and the other end of the fourteenth resistor R14 is connected with a power supply VCC through a thirteenth resistor R13; the common end of the fourteenth resistor R14 and the thirteenth resistor R13 is connected with the inverting input end of the instrumentation amplifier in the demodulation circuit, the inverting input end of the instrumentation amplifier in the demodulation circuit is connected with the other end of a seventeenth capacitor C17, and one end of the seventeenth capacitor C17 is connected with 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 with the output end of the amplitude control instrumentation amplifier, and the output end of the amplitude control instrumentation amplifier is connected with the inverting input end of the amplitude control instrumentation amplifier; the positive phase input end of the amplitude control instrument amplifier is connected with a power supply VCC through a seventeenth resistor R17, and the common end of the positive phase input end of the amplitude control instrument amplifier and a seventeenth resistor R17 is connected with one end of an eighteenth resistor R18; the other end of the eighteenth resistor R18 is used as the demodulation output end of the demodulation circuit.
The oscillation control circuit comprises a first triode Q1, the base electrode of the first triode Q1 is connected with one end of an eleventh resistor R11, and the common end of the base electrode of the first triode Q1 and the eleventh resistor R11 is connected with one end of a seventh capacitor C7; an emitter of the first triode Q1 is connected with one end of the fourth coupling inductor TID; the other end of the TID of the fourth coupling inductor is connected with the other end of the seventh capacitor C7 through the common end of a twelfth resistor R12; the collector of the first triode Q1 is connected with one end of a fifth coupling inductor TIE; the other end of the eleventh resistor R11 and the other end of the fifth coupling inductor TIE are connected with a power supply VCC; the dotted terminals of the fourth coupling inductor TID and the fifth coupling inductor TIE are connected with a sixth capacitor C6 in series, and the twelfth resistor R12 is connected with the output end of the demodulation circuit instrument amplifier;
the linear adjusting circuit comprises a third potentiometer PP3, wherein the resistance end of the third potentiometer PP3 is connected with the other end of a twenty-ninth resistor R29 in the demodulation circuit and the sliding end is connected with the other end of a second resistor R2 in the demodulation circuit;
the temperature compensation circuit comprises a thermistor Rt, one end of the thermistor Rt is connected with one end of a first resistor R1 in parallel, and the common end of the thermistor Rt, which is connected with the first resistor R1 in parallel, is connected with one end of a negative resistor R-; one end of the negative resistor R-is connected with 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 with one end of the positive resistor R +, and the other end of the positive resistor R + is connected with a power supply VCC; the thermistor Rt is connected with one end of a fifth capacitor C5, and the other end of the fifth capacitor C5 is connected with 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 with the other end of the second coupling inductor TIB;
the voltage regulator comprises a first series voltage stabilizing diode Z1, and the first series voltage stabilizing diode Z1 is formed by connecting the anode of a voltage stabilizing diode Z11 and the anode of a voltage stabilizing diode Z12; the cathode of the voltage stabilizing diode Z12 is connected with a fifth resistor R5, and the fifth resistor R5 is connected with the first port of the first terminal row; the common terminal of the fifth resistor R5 and the cathode of the zener diode Z12 is connected with a power supply VCC; the common end of the anode of the zener diode Z12 and the anode of the zener 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 other end of the nineteenth resistor R19 is connected with one end of a twenty-first resistor R21, and the other end of the twenty-first resistor R21 is connected with the twenty-third resistor R23 and then grounded; the common end of the twenty-first resistor R21 and the twenty-third resistor R23 is connected with one end of a twenty-second resistor R22, the other end of the twenty-second resistor R22 is connected with the other end of a twentieth resistor R20, the cathode of the zener diode Z11 is connected with the anode of a fifth diode D5, and the cathode of the fifth diode is connected with one end of a twenty-second resistor R22; the anode of the fifth diode D5 and the cathode of the Zener diode Z11 are connected with the voltage/current conversion circuit in common; the cathode of the fifth diode D5 is connected to the base of a fourth triode Q4 in the voltage/current conversion circuit;
the zero point adjusting circuit comprises a fifth potentiometer PP5, wherein the fifth potentiometer PP5 is in sliding termination with one end of an eighth resistor R8, the resistance end of the fifth potentiometer PP5 is connected with one ends of a third resistor R3 and a fourth resistor R4, and one end of a fourth resistor R4 is connected with the fourth terminal of the first terminal row; the other end of the fourth resistor R4 is connected with the other end of the resistor of the twentieth resistor R22; the other end of the resistance end of the fifth potentiometer PP5 is connected with a twenty-fourth resistor R24; the other end of the third resistor R3 and the other end of the eighth resistor R8 are connected with the other end of the sixth resistor R6; the other end of the sixth resistor R6 is coupled to the other end of the second coupling inductor TIB.
The voltage/current conversion circuit comprises a damping adjustment circuit and a range adjustment circuit; the range adjusting circuit comprises a sixth potentiometer PP6, one end of the resistance end of the sixth potentiometer PP6 is connected with the cathode of a third diode D3, and the anode of the third diode D3 is connected with the first terminal of the third terminal row; the other end of the resistor end of the sixth potentiometer PP6 is connected with one end of a tenth resistor R10, and the other end of the tenth resistor R10 is connected with a power supply VCC; the sliding end of the sixth potentiometer PP6 is connected to one end of a sixth resistor R6, the other end of the sixth resistor is connected to one end of a thirty-fourth resistor R34, and the other end of the thirty-fourth resistor R34 is connected to the non-inverting input end of the instrumentation amplifier of the damping adjustment circuit through the resistor end of the fourth potentiometer PP4 and the thirty-fifth resistor R35; the potential of the fourth potentiometer PP4 is connected to one end of a fifteenth capacitor C15, the other end of the fifteenth capacitor C15 is connected to one end of a seventh resistor R7, and the other end of the seventh resistor R7 is connected to the sliding end of the sixth potentiometer PP 6; the inverting input end of the instrument amplifier of the damping adjusting circuit is sequentially connected with a twenty-sixth resistor R26 and a twenty-fourth resistor R24; the output end of an instrumentation amplifier of the damping adjustment circuit is connected with one end of a twenty-seventh resistor R27, the other end of the twenty-seventh resistor R27 is connected with a second triode Q2 in a signal loop, and the sixth potentiometer PP6 is connected with a voltage/current conversion circuit;
the cathode of the third diode D3 is connected to a ninth resistor R9, a tenth resistor R10 and a twenty-eighth resistor R28 in sequence, one end of the twenty-eighth resistor R28 is connected to the cathode of a sixth zener diode D6, and the anode of the sixth zener diode D6 is connected to the second terminal of the third terminal row; the other end of the twenty-eighth resistor R28 is connected with the anode of a third diode D3, the cathode of the third diode D3 is connected with the anode of a fourth diode D4, the cathode of the fourth diode D4 is connected with the emitter of a second triode Q2, the base of the second triode Q2 is connected with one end of a twenty-seventh resistor R27, the other end of the twenty-seventh resistor R27 is connected with the output end of a voltage/current switching circuit instrument amplifier, one end of the twenty-seventh resistor R27 is connected with one end of a nineteenth polar capacitor C19, and the other end of the nineteenth polar capacitor C19 is connected with a power supply VCC; one end of the nineteenth active capacitor C19 is connected with one end of the twentieth active capacitor C20; an emitter of the second triode Q2 is connected with the other end of the twentieth active capacitor C20; a collector of the second triode Q2 is connected with a base of a third triode Q3, an emitter of the third triode Q3 is connected with a second terminal of a third terminal row, and lead-out circuits of the base of the third triode Q3 and the second terminal of the third terminal row are connected with a sixteenth capacitor C16; the second terminal of the third terminal row is connected with the anode of a sixth voltage-stabilizing diode D6, and the cathode of the sixth voltage-stabilizing diode D6 is connected with a 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 with the base electrode of a fifth triode Q5, and the collector electrode of the fifth triode Q5 is connected with the common end of the emitter electrode of the fourth triode Q4 and the collector electrode of the third triode Q3; an emitting electrode of the fourth triode is grounded; the common end of the other end of the thirty-third resistor R33 and the base of the fifth triode Q5 is connected with the cathode of an eighth zener diode D8, and the anode of the eighth zener diode D8 is connected with the second terminal of the third terminal row; an emitter of the fifth transistor Q5 is connected to one end of a 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.
The electric control shell 1 is divided into a control circuit board chamber 1a and an adjusting circuit board chamber 1b through a partition board, an adjusting circuit is arranged in the adjusting circuit board chamber 1b, a pressure signal electric control circuit is arranged in the control circuit board chamber 1a, and a pressure signal acquisition circuit is further arranged in the detection bobbin 4. The pressure sensor is hermetically mounted in the pressure sensor detection end sealing shell 5, and the end part of the pressure sensor is abutted against the template plane and is welded and sealed. The two templates are led into a pressure source, and after the two pressure detection end parts of the pressure sensor detect the pressure, the pressure is fed back to the electric control chamber. The whole shell is sealed and the nuclear radiation resistant capacity cavity is arranged on the electric control cavity, and the position with the gap is communicated with the outside after being bent for many times, so that the influence of nuclear radiation is effectively reduced, the service time of an internal electronic element is prolonged, and the differential pressure detection precision is kept in a high-precision measurement state all the time.
Claims (8)
1. A pressure transmitter, characterized by: the device comprises a cylindrical electric control shell (1), wherein two end parts of the electric control shell (1) are respectively connected with an end cover (2), and an adjusting circuit and a control circuit are arranged in the electric control shell (1);
the side wall of the electric control shell (1) is connected with a detection bobbin (4), a pressure sensor switching circuit is arranged in the detection bobbin (4), the signal sending end of the detection bobbin (4) is communicated with the inside of the electric control shell (1), the signal sending end of the detection bobbin (4) is connected with a pressure sensor detection end sealing shell (5), the side wall of the electric control shell (1) is connected with a signal connection end (6), and the signal connection end (6) is communicated with the inside of the electric control shell (1);
the pressure sensor detection end sealing shell (5) comprises a pressure sensor protection shell (7) and a pressure sensor sealing structure shell arranged inside the pressure sensor protection shell (7).
2. The pressure transmitter of claim 1, wherein: the pressure sensor sealing structure shell comprises a pressure sensor (Y), a three-way welding sleeve (H) and two templates (M), the pressure sensor (Y) is fixed in the three-way welding sleeve (H) to form a diaphragm capsule, the thickness of the pressure sensor (Y) is equal to the length of a transverse channel of the three-way welding sleeve (H), the end faces of two pressure detection ends of the diaphragm capsule are flush, the end faces of the two pressure detection ends of the diaphragm capsule are correspondingly abutted and sealed with the planes of the two templates (M), and a signal sending end of a detection bobbin (4) extends into the pressure sensor detection end sealing shell (5) and then is connected with a vertical through hole of the three-way welding sleeve (H); the two templates (M) are connected through at least two bolts, and the distance between the two templates (M) is equal to the length of the outer diameter of the vertical channel of the three-way welding sleeve (H).
3. The pressure transmitter of claim 2, wherein: the template (M) comprises an outer display surface, an inner connection surface and a side surface, a membrane seat mounting groove is formed in the inner connection surface of the template (M), the end surface of a pressure detection end of the membrane box just extends into the membrane seat mounting groove, the transverse end surface of a three-way welding sleeve (H) of the pressure detection end of the membrane box is abutted against the bottom of the membrane seat mounting groove, and the edge of the detection end of the pressure sensor (Y) is abutted against the bottom of the membrane seat mounting groove through an O-shaped ring;
a pressure collecting hole is formed in the template (M), the pressure collecting hole is a three-through hole, the transverse through hole of the pressure collecting hole penetrates through the side face of the template (M), and the vertical hole of the pressure collecting hole penetrates out of the bottom of the mounting groove of the membrane seat;
and a shell pressure acquisition hole is formed in the pressure sensor protection shell (7), and corresponds to the pressure acquisition holes in the side surface of the template (M) one by one.
4. The pressure transmitter of claim 3, wherein: the pressure sensor (Y) comprises two pressure measuring assemblies and a measuring diaphragm (Y1), and the two pressure measuring assemblies are symmetrically connected to two measuring surfaces of the measuring diaphragm (Y1);
the pressure measurement assembly comprises a membrane seat (Y2), one surface, facing the measurement membrane (Y1), of the membrane seat (Y2) is a concave arc surface, the concave arc surface of the membrane seat (Y2) and the measurement membrane (Y1) are surrounded to form an oil cavity (Y3), the concave arc surface of the membrane seat (Y2) is coated with an isolation coating (Y4), a signal oil pipe (Y5) is embedded in the membrane seat (Y2), one end of the signal oil pipe (Y5) penetrates through the isolation coating (Y4) to be communicated with the oil cavity (Y3), and the other end of the signal oil pipe (Y5) penetrates out of the side wall of the membrane seat (Y2); the signal oil pipe (Y5) is a hollow silicon oil pipe, the material of the signal oil pipe is a metal conducting wire, and the other end of the signal oil pipe (Y5) is plugged by a crater;
one surface of the membrane seat (Y2) far away from the concave cambered surface is connected with the plane end of the corrugated base (Y6);
one surface of the corrugated base (Y6) far away from the plane end of the corrugated base is a corrugated surface, a positioning groove (Y10) is formed in the corrugated surface of the corrugated base (Y6), an isolation diaphragm (Y7) and a gasket ring (Y9) are sequentially installed in the positioning groove from the bottom of the groove, the size of the positioning groove is matched with the size of the isolation diaphragm (Y7) and the size of the gasket ring (Y9), the gasket ring (Y9) covers the edge of the isolation diaphragm (Y7), and the O-shaped ring is abutted to the gasket ring (Y9);
and a penetrating pressure oil hole (Y8) is formed in the membrane seat (Y2) and the corrugated base (Y6), one end of the pressure oil hole (Y8) is communicated with the oil cavity (Y3), and the other end of the pressure oil hole (Y8) is abutted to the isolation membrane (Y7).
5. The pressure transmitter of claim 1, wherein: the signal connection end (6) comprises an aviation socket base (61), a connector socket (62) and a connector plug (63) which are connected in sequence;
the bottom of the aviation socket base (61) is communicated with the control circuit board cavity (1 a).
6. The pressure transmitter of claim 1, wherein: the end face of the end part of the electric control shell (1) is provided with three-level steps which are sequentially increased from an inner ring to an outer ring, the step faces of the three-level steps are a first end face step face, a second end face step face and a third end face step face from inside to outside, a circle of end cover convex ring is protruded in the end cover covering face of the end cover (2), the end cover convex ring table face of the end cover (2) is just abutted to the first end face step face, the edge of the end cover covering face of the end cover (2) is abutted to the third end face step face, and an end cover sealing ring (8) is further arranged between the second end face step face and the end cover covering face of the end cover (2).
7. The pressure transmitter of claim 1, wherein: the side wall of the electric control shell (1) is also provided with at least one adjusting hole, and an adjusting rod (9) is arranged in the adjusting hole; an adjusting protective cover (10) is further mounted on the outer wall of the electric control shell (1) corresponding to the adjusting hole; a protective boss protrudes from the protective covering surface of the adjusting protective cover (10);
the adjusting hole corresponds it has the level four step that reduces from outside to inside in proper order to open on automatically controlled casing (1) outer wall, the level face of level four step is first protection step face, second protection step face, third protection step face and fourth protection step face from inside to outside in proper order, first protection step face with adjusting hole inner wall connection, first protection step face is used for the joint adjusting lever (9), second protection step face with protection boss mesa butt, fourth protection step face does automatically controlled casing (1) outer wall, the protection cover face butt of adjustment visor (10) is in on the fourth protection step face, third protection step face with be provided with protection sealing washer (11) between the protection cover face of adjustment visor (10).
8. The pressure transmitter of claim 1, wherein: the electric control shell (1) is divided into a control circuit board chamber (1a) and an adjusting circuit board chamber (1b) by a partition plate;
the control circuit board cavity (1a) is communicated with the signal connection end (6); the adjusting circuit board chamber (1b) is communicated with the detection bobbin (4);
the adjusting circuit is fixed in the adjusting circuit board cavity (1b) through an adjusting circuit board;
the control circuit is fixed in the control circuit board cavity (1a) through a control circuit board;
the pressure sensor switching circuit is fixed on the detection bobbin (4) through a pressure sensor switching circuit board.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023342353.XU CN214748596U (en) | 2020-12-31 | 2020-12-31 | Pressure transmitter |
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| CN202023342353.XU CN214748596U (en) | 2020-12-31 | 2020-12-31 | Pressure transmitter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115077784A (en) * | 2022-01-11 | 2022-09-20 | 上海洛丁森工业自动化设备有限公司 | Pressure transmitter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115077784A (en) * | 2022-01-11 | 2022-09-20 | 上海洛丁森工业自动化设备有限公司 | Pressure transmitter |
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