CN111707408A - Sputtering film pressure transmitter - Google Patents
Sputtering film pressure transmitter Download PDFInfo
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- CN111707408A CN111707408A CN202010651589.7A CN202010651589A CN111707408A CN 111707408 A CN111707408 A CN 111707408A CN 202010651589 A CN202010651589 A CN 202010651589A CN 111707408 A CN111707408 A CN 111707408A
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- pressure transmitter
- holder
- film pressure
- signal processing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/0061—Electrical connection means
- G01L19/0069—Electrical connection means from the sensor to its support
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
- G01L19/069—Protection against electromagnetic or electrostatic interferences
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/14—Housings
- G01L19/142—Multiple part housings
- G01L19/143—Two part housings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/14—Housings
- G01L19/145—Housings with stress relieving means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/14—Housings
- G01L19/147—Details about the mounting of the sensor to support or covering means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/14—Housings
- G01L19/148—Details about the circuit board integration, e.g. integrated with the diaphragm surface or encapsulation
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Electromagnetism (AREA)
- Health & Medical Sciences (AREA)
- Child & Adolescent Psychology (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention provides a sputtering film pressure transmitter, which belongs to the technical field of sensors and sequentially comprises the following components from top to bottom: go up shell subassembly, circuit board assembly and lower shell subassembly, and form the electricity through first contact pin between upper shell subassembly and the circuit board assembly and link, form the electricity through the gold silk between lower shell subassembly and the circuit board assembly and link, go up shell subassembly and pass through welded fastening between the shell subassembly. According to the sputtering film pressure transmitter provided by the invention, reverse connection prevention and suppression of interference signals such as surge, pulse group, conduction, radiation and the like are realized through the power supply protection circuit board, and in addition, the power supply protection circuit board, the signal processing circuit board and the signal switching circuit board in the circuit board assembly are all fixed through pure mechanical structures, so that the method is different from the method of fixing by adopting colloid in the prior art, the influence on the reliability of the transmitter due to high-temperature molten colloid is avoided, and the use stability of the transmitter is improved.
Description
Technical Field
The invention belongs to the technical field of sensors, and relates to a transmitter, in particular to a sputtering film pressure transmitter.
Background
Pressure transmitters are the most common sensors used in industrial practice, and are suitable for use in industrial autonomous environments for measuring the pressure of liquids, gases or vapors, etc. The pressure transmitter mainly comprises a load cell sensor, a module circuit, a display gauge head, a meter shell, a connecting piece and the like, and can convert pressure signals of gas, liquid and the like received by the load cell sensor into standard current and voltage signals.
Chinese patent (CN 210400699U) discloses a pressure transmitter, a pressure detection device and an engineering machine, wherein the pressure transmitter includes an electrical connector and a pressure guiding nozzle connected together, a pressure detection path and a pressure sensitive element for detecting the pressure in the pressure detection path are arranged in the pressure guiding nozzle, a signal conditioning circuit board is arranged in the electrical connector, and the pressure sensitive element, the signal conditioning circuit board and the electrical connector are electrically connected in sequence; in addition, the pressure transmitter also comprises a metal shielding cover which has shielding and heat dissipation functions for the signal conditioning circuit board, and a pressure buffer channel for buffering the impact of the detected high-pressure medium; the pressure detection device and the engineering machinery both comprise the pressure transmitter.
Although the above-described pressure transmitter implements signal interference by the metal shield, the effect of interference resistance is not good.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a pressure transmitter with a strong anti-interference effect.
The purpose of the invention can be realized by the following technical scheme: a sputtered film pressure transmitter comprising: from top to bottom include in proper order: the utility model provides a signal processing device, including upper casing subassembly, circuit board assembly and lower casing subassembly, and form the electricity through first contact pin between upper casing subassembly and the circuit board assembly and link, bind through the gold wire between lower casing subassembly and the circuit board assembly and form the electricity and link, through welded fastening between upper casing subassembly and the lower casing subassembly, wherein, circuit board assembly includes the contact pin support, and the thickness direction along the contact pin support has set gradually power protection circuit board, signal processing circuit board and signal switching circuit board, wherein, power protection circuit board and signal processing circuit board, all link through second contact pin electricity between signal processing circuit board and the signal switching circuit board.
In the sputtering film pressure transmitter, the power protection circuit board is provided with a first socket and a second socket, the first socket is provided with three interfaces, namely a VCC interface, an OUT interface and an EARTH interface, and the second socket is provided with two interfaces, namely a first interface and a second interface; one end of an inductor Z1 is connected with one end of a voltage dependent resistor RV1 and the VCC interface respectively, and the other end of the inductor Z1 is connected with one end of a diode V1, one end of a diode V2, one end of a capacitor C1, one end of a capacitor C3 and the first interface in the second socket respectively; one end of an inductor Z2 is connected with the other end of the piezoresistor RV1 and the OUT interface respectively, and the other end of the inductor Z2 is connected with the other end of the diode V1, the other end of the diode V2, one end of the capacitor C2, the other end of the capacitor C3 and a second interface in the second socket respectively; the other end of the capacitor C1 and the other end of the capacitor C2 are connected with EARTH.
In the sputtering film pressure transmitter, the copper-clad salient points are arranged at the edges of the power protection circuit board and the signal switching circuit board.
In the sputtering film pressure transmitter, the pin support comprises a first support and a second support which are arranged in an up-down overlapping mode, the signal processing circuit board is located between the first support and the second support, two sides of the signal processing circuit board are respectively welded with the first support and the second support, and a positioning portion is respectively arranged between the signal processing circuit board and the first support as well as between the signal processing circuit board and the second support and respectively comprises a first positioning portion and a second positioning portion.
In the sputtering film pressure transmitter, the first support and the second support are both provided with elastic fins.
In the sputtering film pressure transmitter, a third pin is further arranged between the circuit board assembly and the upper shell assembly, wherein two ends of the third pin are respectively and electrically connected with the power supply protection circuit board in the circuit board assembly and the connector core piece in the upper shell assembly.
In the sputtering film pressure transmitter, the upper shell assembly comprises an upper shell, one end of the upper shell is provided with an external thread, and the other end of the upper shell is provided with a first vent hole; the connector core piece is nested on the upper shell, wherein a concave cavity and a second vent hole are formed in the connector core piece; the waterproof breathable film is embedded in the concave cavity and corresponds to the first vent hole in position.
In the sputtering film pressure transmitter, the connector core is arranged in a step shape, and the step-shaped connector core comprises a first step part and a second step part, wherein the second step part is abutted and matched with the step part of the upper shell, and the second step part is arranged in an umbrella shape.
In the above-mentioned sputtered film pressure transmitter, the lower shell subassembly includes the lower casing, and nested a core seat in it, wherein, the one end and the pressure core welding of core seat, the other end and the inside wall welding of lower casing of core seat.
In the sputtering film pressure transmitter, a ring of annular flange is arranged along the axial direction of the core seat, and the annular flange is abutted and matched with the step part on the lower shell, wherein an annular groove is arranged along the axial direction of the annular flange.
Compared with the prior art, the invention has the beneficial effects that:
(1) in addition, the power protection circuit board, the signal processing circuit board and the signal switching circuit board in the circuit board assembly are fixed through pure mechanical structures, and the method is different from the method of fixing by adopting a colloid in the prior art, so that the reliability of the transmitter is prevented from being influenced by melting the colloid at high temperature, and the use stability of the transmitter is improved;
(2) in addition, compared with the prior art that a triode is adopted to amplify output current, the rated power of the triode is greatly reduced under the high-temperature state, and the requirement of output power cannot be met, in the embodiment, the output signal is amplified, temperature compensated and nonlinear compensated through a signal processing circuit board and is converted into a standard signal for output, so that the problem that the output power is influenced by high temperature is solved, and the use reliability of the transmitter is improved;
(3) axial gaps between the power protection circuit board and the upper shell assembly and between the signal transfer circuit board and the lower shell assembly are eliminated by arranging the copper-clad layer salient points, so that the circumferential freedom degree of the power protection circuit board and the signal transfer circuit board is limited, and the use reliability of the transmitter is improved;
(4) the accuracy of the signal processing circuit board when the signal processing circuit board is welded with the first support and the second support is achieved through the first positioning part and the second positioning part, and the first positioning part and the second positioning part share the groove in the signal processing circuit board, so that the number of grooves in the signal processing circuit board is reduced, and the strength of the signal processing circuit board is improved;
(5) the elastic fins are arranged on the first support and the second support, so that the reliability of connection between the first support and the power supply protective circuit board and between the second support and the signal transfer circuit board is improved, the power supply protective circuit board and the signal transfer circuit board are prevented from moving, two ends of the circuit board assembly are respectively abutted against the upper shell assembly and the lower shell assembly, the axial clearance between the circuit board assembly and the upper shell assembly and between the circuit board assembly and the lower shell assembly is eliminated, the circumferential freedom degree of the circuit board assembly is limited, and the use reliability of the transmitter is improved;
(6) through setting up the third contact pin, and this third contact pin is the debugging contact pin for pressure transmitter is after the assembly is accomplished, under finished product state promptly, can debug, test, has made things convenient for the debugging process of changer, and has accelerated the assembly efficiency of changer. In addition, the length of the third pin at the end of the connector core member in this embodiment is much less than the length of the first pin, and thus, the provision of the third pin does not affect the use of the first pin. The first contact pin is a contact pin used by a user;
(7) through the arrangement of the waterproof and breathable film, on one hand, the waterproof and dustproof effect of the transmitter is achieved, the service life of the transmitter is prolonged, on the other hand, the pressure balance inside and outside the transmitter is guaranteed, the measurement accuracy of the transmitter is improved, and on the third hand, through the first vent hole, the waterproof and breathable film and the second vent hole, the smooth air passage between the upper shell assembly and the lower shell assembly in the transmitter is guaranteed, the response time of the transmitter is shortened, and the response speed is accelerated;
(8) through setting up the cavity for waterproof ventilated membrane can be embedded on the lateral wall of connector chipware, reduces the axial clearance between the inner wall of last casing and the connector chipware outer wall, further improves the water-proof effects of changer. In addition, the concave cavity is arranged in a convex structure, and the convex part of the convex structure is aligned to the second vent hole, so that the flow range of the gas path is limited, and the response speed of the transmitter is further increased;
(9) axial clearance when the connector core piece is connected with the upper shell in a nested manner is eliminated through the second step part arranged in an umbrella shape, and the circumferential freedom degree of the connector core piece is limited, so that the smoothness of an air path is ensured, and the corresponding speed of the transmitter is improved;
(10) through setting up annular groove for release the welding stress between core body seat and the inferior valve, and the produced stress of pretightning force when releasing the changer installation, avoided pressure signal's drift, improve the stability of changer.
Drawings
FIG. 1 is a schematic diagram of a sputtered film pressure transducer of the present invention.
FIG. 2 is a cross-sectional view of a sputtered thin film pressure transmitter of the present invention.
FIG. 3 is an exploded view of a sputtered film pressure transmitter of the present invention.
Fig. 4 is a schematic structural diagram of the upper case assembly and the power protection circuit board according to a preferred embodiment of the invention.
Fig. 5 is a partial schematic structural diagram of a circuit board assembly according to a preferred embodiment of the invention.
Fig. 6 is a schematic structural diagram of the lower housing assembly and the signal transfer circuit board according to a preferred embodiment of the invention.
FIG. 7 is a schematic circuit diagram of a power protection circuit board according to a preferred embodiment of the invention.
In the figure, 100, the upper shell component; 110. an upper housing; 111. a first vent hole; 120. a connector core member; 121. a second vent hole; 122. a concave cavity; 123. a first step portion; 124. a second step section; 130. a waterproof breathable film; 200. a circuit board assembly; 210. a pin support; 211. a first bracket; 2111. a first bump; 212. a second bracket; 2121. a second bump; 213. a first positioning portion; 214. a second positioning portion; 220. a power supply protection circuit board; 221. a first socket; 222. a second socket; 230. a signal processing circuit board; 231. a groove; 240. a signal transfer circuit board; 250. a second pin; 260. salient points; 270. an elastic fin; 300. a lower housing assembly; 310. a lower housing; 320. a core body seat; 321. an annular flange; 3211. an annular groove; 330. a pressure core; 400. a first pin; 500. gold wire; 600. and a third pin.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1 to 7, the sputtering film pressure transmitter provided by the present invention sequentially comprises, from top to bottom: the upper case assembly 100, the circuit board assembly 200 and the lower case assembly 300 are electrically connected through a first pin 400 between the upper case assembly 100 and the circuit board assembly 200, the lower case assembly 300 and the circuit board assembly 200 are electrically connected through a gold wire 500, and the upper case assembly 100 and the lower case assembly 300 are fixed by welding, wherein the circuit board assembly 200 includes a pin bracket 210, and a power protection circuit board 220, a signal processing circuit board 230 and a signal transfer circuit board 240 are sequentially disposed along a thickness direction of the pin bracket 210, wherein the power protection circuit board 220 and the signal processing circuit board 230, and the signal processing circuit board 230 and the signal transfer circuit board 240 are electrically connected through a second pin 250.
According to the sputtering film pressure transmitter provided by the invention, reverse connection prevention and suppression of interference signals such as surge, pulse group, conduction, radiation and the like are realized through the power supply protection circuit board 220, and in addition, the power supply protection circuit board 220, the signal processing circuit board 230 and the signal switching circuit board 240 in the circuit board assembly 200 are all fixed through pure mechanical structures, so that the method is different from the method of fixing by adopting colloid in the prior art, the influence on the reliability of the transmitter due to high-temperature colloid melting is avoided, and the use stability of the transmitter is improved.
Preferably, as shown in fig. 1 to 7, a first socket 221 and a first socket 222 are disposed on the power protection circuit board 220, the first socket 221 is provided with three interfaces, which are a VCC interface, an OUT interface and an EARTH interface, respectively, and the first socket 222 is provided with two interfaces, which are a first interface and a second interface, respectively; one end of an inductor Z1 is connected with one end of a voltage dependent resistor RV1 and the VCC interface respectively, and the other end of the inductor Z1 is connected with one end of a diode V1, one end of a diode V2, one end of a capacitor C1, one end of a capacitor C3 and the first interface in the first socket 222 respectively; one end of an inductor Z2 is connected with the other end of the piezoresistor RV1 and the OUT interface respectively, and the other end of the inductor Z2 is connected with the other end of the diode V1, the other end of the diode V2, one end of the capacitor C2, the other end of the capacitor C3 and the second interface in the first socket 222 respectively; the other end of the capacitor C1 and the other end of the capacitor C2 are connected with EARTH.
In this embodiment, the inductors Z1 and Z2 are used to suppress high-frequency common mode interference, the diodes V1 and V2 suppress interference such as surge and pulse group, the capacitors C1 and C2 are high-voltage ceramic capacitors to filter common mode interference, and the capacitor C3 is a differential capacitor to filter differential mode interference, in addition, compared with the prior art that a triode is used to amplify an output current, the rated power of the triode is greatly reduced at a high temperature state, which cannot meet the requirement of output power, in this embodiment, the signal processing circuit board 230 is used to amplify, temperature compensate and nonlinear compensate an output signal and convert the output signal into a standard signal for output, thereby solving the problem that high temperature affects the output power and improving the reliability of the transmitter.
Preferably, as shown in fig. 1 to 7, copper-clad bumps 260 are provided at the edges of the power supply protection circuit board 220 and the signal relay circuit board 240. Therefore, axial gaps between the power protection circuit board 220 and the upper shell assembly 100 and between the signal transfer circuit board 240 and the lower shell assembly 300 are eliminated, the circumferential freedom degree of the power protection circuit board 220 and the signal transfer circuit board 240 is further limited, and the use reliability of the transmitter is improved.
Preferably, as shown in fig. 1 to 7, the pin holder 210 includes a first holder 211 and a second holder 212 which are stacked up and down, and the signal processing circuit board 230 is located between the first holder 211 and the second holder 212, wherein two sides of the signal processing circuit board 230 are respectively welded with the first holder 211 and the second holder 212, and a positioning portion, namely a first positioning portion 213 and a second positioning portion 214, is respectively provided between the signal processing circuit board 230 and the first holder 211 and the second holder 212.
Further preferably, the first positioning portion 213 and the second positioning portion 214 are both in a concave-convex nesting fit.
Further preferably, the first positioning portion 213 includes a first protrusion 2111 disposed on the first bracket 211, and a first groove 231 disposed on the signal processing circuit board 230; the second positioning portion 214 includes a second protrusion 2121 disposed on the second bracket 212 and a second groove 231 disposed on the signal processing circuit board 230, wherein the first groove 231 and the second groove 231 are disposed in an overlapping manner or disposed at an interval.
In this embodiment, the first positioning portion 213 and the second positioning portion 214 are used to achieve the accuracy when the signal processing circuit board 230 is welded to the first bracket 211 and the second bracket 212, and the first positioning portion 213 and the second positioning portion 214 share the groove 231 on the signal processing circuit board 230, so as to reduce the number of slots on the signal processing circuit board 230 and improve the strength of the signal processing circuit board 230.
It is further preferable that the elastic fins 270 are disposed on both the first bracket 211 and the second bracket 212, wherein the positions of the elastic fins 270 on the first bracket 211 correspond to the positions of the first protrusions 2111 on the first bracket 211, and the positions of the elastic fins 270 on the second bracket 212 correspond to the positions of the second protrusions 2121 on the second bracket 212.
In this embodiment, by providing the elastic fins 270 on the first bracket 211 and the second bracket 212, on one hand, the reliability of the connection between the first bracket 211 and the power protection circuit board 220 and the reliability of the connection between the second bracket 212 and the signal transmission circuit board 240 are increased, thereby preventing the power protection circuit board 220 and the signal transmission circuit board 240 from moving, on the other hand, two ends of the circuit board assembly 200 are respectively abutted against the upper casing assembly 100 and the lower casing assembly 300, eliminating the axial gaps between the circuit board assembly 200 and the upper casing assembly 100 and between the circuit board assembly 200 and the lower casing assembly 300, limiting the circumferential degree of freedom of the circuit board assembly 200, and improving the reliability of the transmitter in use.
Preferably, as shown in fig. 1 to 7, a third pin 600 is further provided between the circuit board assembly 200 and the upper shell assembly 100, wherein both ends of the third pin 600 are electrically connected to the power supply protection circuit board 220 in the circuit board assembly 200 and the connector core member 120 in the upper shell assembly 100, respectively.
In this embodiment, the transmitter all needs to debug before using to this ensures the reliability that the transmitter used, and among the prior art, only set up the contact pin that the user used on general transmitter, does not have the debugging contact pin that corresponds, consequently, need in the assembling process of transmitter, for under the unfinished product state, just need debug the processing to the transmitter, the operation is inconvenient, influences the assembly efficiency of transmitter moreover. In this embodiment, the third pin 600 is provided, and the third pin 600 is a debugging pin, so that the pressure transmitter can be debugged and tested after the pressure transmitter is assembled, i.e., in a finished product state, thereby facilitating the debugging process of the transmitter and accelerating the assembly efficiency of the transmitter. Additionally, the length of the third pin 600 at one end of the connector core 120 in this embodiment is much less than the length of the first pin 400, and thus, the provision of the third pin 600 does not affect the use of the first pin 400. Wherein the first pin 400 is a pin used by a user.
Preferably, as shown in fig. 1 to 7, the upper case assembly 100 includes an upper case 110 provided with an external thread at one end and a first vent hole 111 at the end; the connector core piece 120 is fitted to the upper case 110, and the second vent hole 121 is provided in the connector core piece 120; and the waterproof breathable film 130 is positioned between the upper shell 110 and the connector core member 120 and corresponds to the position of the first vent hole 111.
Because the changer in this embodiment, be applied to gauge pressure (an atmospheric pressure) state, consequently, waterproof performance is an important index of changer, and in this embodiment, through setting up waterproof ventilated membrane 130, on the one hand, the waterproof dustproof effect of changer has been realized, the life of changer is prolonged, on the other hand, the pressure balance inside and outside the changer has been guaranteed, improve the measuring accuracy of changer, the third aspect, through first air vent 111, waterproof ventilated membrane 130 and second air vent 121, the gas circuit smoothness between upper shell subassembly 100 and the lower shell subassembly 300 in the changer has been guaranteed, the response time of changer has been shortened, and response speed has been accelerated.
It is further preferred that a cavity 122 is formed in the side wall of the connector core member 120, wherein the cavity 122 serves as a mounting space for the waterproof and breathable membrane 130.
Further preferably, the cavity 122 is configured in a "convex" shape, wherein the convex portion of the "convex" shaped cavity 122 is disposed opposite to the second ventilation hole 121.
In this embodiment, by providing the concave cavity 122, the waterproof air-permeable membrane 130 can be embedded on the side wall of the connector core 120, so as to reduce the axial gap between the inner wall of the upper shell 110 and the outer wall of the connector core 120, and further improve the waterproof effect of the transmitter. In addition, the cavity 122 is in a shape like a Chinese character 'tu', and the convex part of the Chinese character 'tu' is aligned with the second vent hole 121, so that the flow range of the gas path is limited, and the response speed of the transmitter is further increased.
It is further preferred that the connector core 120 is provided in a step-like manner, and that the step-like connector core 120 comprises a first step 123 and a second step 124, wherein the second step 124 is in abutting engagement with the step of the upper housing 110, and the second step 124 is provided in an umbrella-like manner.
In this embodiment, the second stepped portion 124 provided in an umbrella shape eliminates an axial gap when the core member 120 and the upper housing 110 are nested and connected, and defines a circumferential degree of freedom of the core member 120, thereby ensuring smooth air passages and further increasing the corresponding speed of the transmitter.
Preferably, as shown in fig. 1 to 7, the lower case assembly 300 includes a lower case 310 in which a core holder 320 is nested, wherein one end of the core holder 320 is welded to a pressure core 330, and the other end of the core holder 320 is welded to an inner sidewall of the lower case 310.
Further preferably, a ring of annular flange 321 is provided along the axial direction of the core body seat 320, and the annular flange 321 is in abutting engagement with the step portion on the lower housing 310, wherein an annular groove 3211 is provided along the axial direction of the annular flange 321.
In this embodiment, by providing the annular groove 3211, the welding stress between the core holder 320 and the lower case is released, and the stress generated by the pretightening force when the transmitter is installed is released, thereby avoiding the drift of the pressure signal and improving the stability of the transmitter.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a sputter film pressure transmitter which characterized in that from top to bottom includes in proper order: the utility model provides a power supply protection circuit board, signal processing circuit board and signal switching circuit board, wherein, power supply protection circuit board and signal processing circuit board, all link through second contact pin electricity between signal processing circuit board and the signal switching circuit board, circuit board subassembly and the lower casing subassembly, and form the electricity through first contact pin between upper casing subassembly and the circuit board subassembly and link, form the electricity through the gold wire between lower casing subassembly and the circuit board subassembly and link, through welded fastening between upper casing subassembly and the lower casing subassembly, wherein, circuit board subassembly includes the contact pin support, and the thickness direction along the contact pin support has set gradually power supply protection circuit board, signal processing circuit board and signal switching circuit board, wherein, power.
2. The sputtering film pressure transmitter of claim 1, wherein the power protection circuit board is provided with a first socket and a second socket, the first socket is provided with three interfaces, namely a VCC interface, an OUT interface and an EARTH interface, the second socket is provided with two interfaces, namely a first interface and a second interface, wherein one end of the inductor Z1 is connected with one end of the varistor RV1 and the VCC interface, respectively, and the other end of the inductor Z1 is connected with one end of the diode V1, one end of the diode V2, one end of the capacitor C1, one end of the capacitor C3 and the first interface of the second socket, respectively; one end of an inductor Z2 is connected with the other end of the piezoresistor RV1 and the OUT interface respectively, and the other end of the inductor Z2 is connected with the other end of the diode V1, the other end of the diode V2, one end of the capacitor C2, the other end of the capacitor C3 and a second interface in the second socket respectively; the other end of the capacitor C1 and the other end of the capacitor C2 are connected with EARTH.
3. The sputtering film pressure transmitter of claim 1 or 2, wherein copper-clad bumps are provided on the edges of the power supply protection circuit board and the signal relay circuit board.
4. The sputtering film pressure transmitter according to claim 1 or 2, wherein the pin holder includes a first holder and a second holder which are arranged in an up-down stacked manner, and the signal processing circuit board is located between the first holder and the second holder, wherein both sides of the signal processing circuit board are respectively welded to the first holder and the second holder, and a positioning portion is respectively provided between the signal processing circuit board and the first holder and between the signal processing circuit board and the second holder.
5. The sputtering film pressure transmitter of claim 4 wherein resilient fins are provided on both the first support and the second support.
6. The sputtering film pressure transmitter of claim 1 or 2, wherein a third pin is further provided between the circuit board assembly and the upper case assembly, wherein both ends of the third pin are electrically connected to the connector core members in the power source protective circuit board and the upper case assembly, respectively.
7. The sputtering film pressure transmitter of claim 6 wherein the upper housing assembly comprises an upper housing having an external thread at one end and a first vent at the end; the connector core piece is nested on the upper shell, wherein a concave cavity and a second vent hole are formed in the connector core piece; the waterproof breathable film is embedded in the concave cavity and corresponds to the first vent hole in position.
8. The sputtering film pressure transmitter of claim 7 wherein the connector core is stepped and includes a first step and a second step, wherein the second step is in abutting engagement with the step of the upper housing and the second step is umbrella shaped.
9. The sputtering film pressure transmitter of claim 1 or 2 wherein the lower housing assembly comprises a lower housing in which a core holder is nested, wherein one end of the core holder is welded to the pressure core and the other end of the core holder is welded to the inner sidewall of the lower housing.
10. The sputtering film pressure transmitter of claim 9 wherein a ring of annular flange is provided along the axial direction of the core holder and the annular flange is in abutting engagement with the step on the lower housing, wherein an annular groove is provided along the axial direction of the annular flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010651589.7A CN111707408B (en) | 2020-07-08 | 2020-07-08 | Sputtering film pressure transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010651589.7A CN111707408B (en) | 2020-07-08 | 2020-07-08 | Sputtering film pressure transmitter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112414615A (en) * | 2020-11-10 | 2021-02-26 | 宁波中车时代传感技术有限公司 | Ultrahigh voltage sputtering resistant film pressure transmitter and manufacturing method thereof |
| CN112611503A (en) * | 2020-11-25 | 2021-04-06 | 武汉中航传感技术有限责任公司 | Miniaturized pressure sensor structure |
| CN114646420A (en) * | 2022-05-19 | 2022-06-21 | 成都倍芯传感技术有限公司 | Pressure transmitter with high reliability |
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| CN112414615A (en) * | 2020-11-10 | 2021-02-26 | 宁波中车时代传感技术有限公司 | Ultrahigh voltage sputtering resistant film pressure transmitter and manufacturing method thereof |
| CN112611503A (en) * | 2020-11-25 | 2021-04-06 | 武汉中航传感技术有限责任公司 | Miniaturized pressure sensor structure |
| CN112611503B (en) * | 2020-11-25 | 2022-05-03 | 武汉中航传感技术有限责任公司 | Miniaturized pressure sensor structure |
| CN114646420A (en) * | 2022-05-19 | 2022-06-21 | 成都倍芯传感技术有限公司 | Pressure transmitter with high reliability |
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| CN111707408B (en) | 2021-10-29 |
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