CN109238552B - Pressure sensor assembly for microwave digestion device - Google Patents
Pressure sensor assembly for microwave digestion device Download PDFInfo
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- CN109238552B CN109238552B CN201811173140.3A CN201811173140A CN109238552B CN 109238552 B CN109238552 B CN 109238552B CN 201811173140 A CN201811173140 A CN 201811173140A CN 109238552 B CN109238552 B CN 109238552B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- Chemical & Material Sciences (AREA)
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Abstract
The invention discloses a pressure sensor assembly for a microwave digester, which relates to the technical field of laboratory detection equipment and comprises a pressure sensor 8 and a pressure sensor signal cable 10; the pressure sensor also comprises a base 9, a cover 1, a pressure sensor fixing seat 5 and a pressure sensor surface protection layer group; the pressure sensor fixing seat 5 is arranged in a step blind hole in the middle of the base 9, the pressure sensor 8 is arranged in a step through hole in the middle of the pressure sensor fixing seat 5, and a pressure sensor signal cable 10 connected with the bottom surface of the pressure sensor 8 passes through a through hole below the pressure sensor fixing seat 5 and then passes through a radial hole at the lower part of the base 9; the pressure sensor surface protection layer is arranged on the base 9, and the cover 1 with the step through hole in the middle is sleeved on the upper part of the base 9; the device has the characteristics of simple structure, good corrosion resistance, high precision and the like, and is used for detecting heavy metals or other harmful substances in a laboratory.
Description
Technical Field
The invention relates to the technical field of laboratory detection equipment, in particular to a pressure sensor assembly for a microwave digester.
Background
At present, in the process of detecting samples in a laboratory, the samples with proper weight are generally required to be filled in a digestion tank, then strong acid such as concentrated nitric acid, perchloric acid, hydrogen peroxide and the like and strong oxidizing reagents are added, the digestion tank assembly is assembled, the digestion tank assembly (single or multiple) is placed on a digestion tank tray, the reagents in the tank are soaked for a plurality of hours and then transferred into a microwave digestion device, and then the digestion process is carried out according to a set program. In the digestion process, microwaves generated by the microwave digestion device act on the digestion tank, and the temperature in the digestion tank is continuously increased due to the reaction of strong acid and strong alkali with the sample, so that the air pressure is increased. Dangerous situations can occur when the air pressure in the tank exceeds a certain value. Thus, in general, a pressure sensor is placed in the digestion tank to monitor the gas pressure within the tank to avoid dangerous situations. As strong acid and strong alkali are added in the digestion tank, the digestion tank belongs to a high corrosion environment, and therefore, the requirement on the corrosion resistance of the pressure sensor is high.
The patent application number 95231269.7 discloses a corrosion-resistant pressure sensor, which comprises a shell, a junction box and a connecting flange which are assembled with the shell into a whole, and a silicon sensitive element which is encapsulated in the shell, wherein the two ends of the silicon sensitive element in the shell are respectively encapsulated with a pressure-guiding medium by using isolation diaphragms made of corrosion-resistant materials, and the connecting flange is combined with a sealing flange which is coated with a lining seal into a whole through a corrosion-resistant sealing gasket.
Another chinese patent (patent application No. 98813506. X) discloses a "media compatible pressure sensor housing" that includes a base (105) with a printed circuit board (115) disposed on the base (105) having a pressure sensor (18) mounted thereon. A sealing element (45) is arranged on the circuit board for sealing the pressure sensor, and a diaphragm (30) is arranged on the sealing element. A fluid port (130) is connected to the base and is compressively connected to the diaphragm to form a sealed cavity around the pressure sensor. A pressure transfer fluid (21), such as oil, is injected into the sealed cavity through an injection port (140) provided on the printed circuit board. Such a construction allows the sensor housing to be easily assembled from common components and allows all of the outer surfaces of the housing to be made of a material that is extremely corrosion resistant.
There is also "a corrosion-resistant pressure sensor based on PDMS piezoresistive and stainless steel capacitance" disclosed in chinese patent (patent application No. 201420231416. X), which includes a hermetically sealed corrosion-resistant housing, and a PDMS piezoresistive sensing unit and a stainless steel capacitance sensing unit mounted in the corrosion-resistant housing. The corrosion-resistant shell is formed by sequentially assembling a hollow bolt, a stainless steel diaphragm, a sealing cover and a nut; the PDMS piezoresistive sensing unit consists of an insulating film, a PDMS piezoresistive layer and an inert rubber upper electrode substrate with a detection electrode on the lower surface; the stainless steel capacitive sensing unit consists of a stainless steel thin film polar plate with a hole in the center and a rear shield base plate.
The micro-pressure corrosion-resistant pressure sensor disclosed in China patent (patent application No. 200520078947.0) comprises a metal shell with a lead and a reference pressure cavity, and is characterized in that a silicon micro-pressure sensor chip is bonded in the metal shell, the chip is connected with the lead in a bonding mode through a gold wire, the metal shell, a gold-platinum-silver-copper alloy diaphragm and a pressure welding ring are welded through a laser, silicone oil is filled between the gold-platinum-silver-copper alloy diaphragm and the silicon pressure sensor chip, and a thick film resistor compensation network is connected to a lead end. The gold-platinum-silver-copper alloy diaphragm is made of gold-platinum-silver-copper alloy 71.5:7.5:6:15. The membrane is made of gold-platinum-silver-copper alloy 71.5:7.5:6:15 and has a thickness of 15 μm.
Also disclosed in chinese patent (patent application No. 201620699457.0) is an "anti-corrosion pressure sensor", comprising a ceramic core (4), an external wire crimping piece (5) and a housing, characterized in that the housing comprises a front housing, the pressure sensor further comprises a liner (2) having a first end and a second end, a groove is provided at the second end of the liner, a through hole for introducing a fluid to be measured is provided along the axial direction of the liner, and the through hole is communicated with the groove; the ceramic core body (4) is tightly pressed at the second end of the lining by the external wire crimping piece (5) to form a pressure measuring cavity; a cavity is arranged along the axial direction of the front shell; the inner lining, the ceramic core body (4) and the external wire crimping piece (5) are sequentially arranged in the cavity.
Disclosure of Invention
The invention aims to solve the technical problem of providing a pressure sensor assembly which has the advantages of simple structure, good corrosion resistance and high precision.
In order to achieve the above object, the present invention adopts a technical scheme that a pressure sensor assembly for a microwave digestion device is provided: comprising a pressure sensor 8 and a pressure sensor signal cable 10; the pressure sensor also comprises a base 9, a cover 1, a pressure sensor fixing seat 5 and a pressure sensor surface protection layer group; the pressure sensor fixing seat 5 is arranged in a step blind hole in the middle of the base 9, the pressure sensor 8 is arranged in a step through hole in the middle of the pressure sensor fixing seat 5, and a pressure sensor signal cable 10 connected with the bottom surface of the pressure sensor 8 passes through a through hole below the pressure sensor fixing seat 5 and then passes through a radial hole at the lower part of the base 9; the pressure sensor surface protection layer is arranged on the base 9, and the cover 1 with the step through hole in the middle is sleeved on the upper part of the base 9.
The pressure sensor surface protection layer group comprises a tetrafluoro soft board 2 and a copper foil board 7, wherein the copper foil board 7 is tightly attached to the ceramic surface of the pressure sensor 8, and the tetrafluoro soft board 2 is arranged on the copper foil board 7.
An aluminum foil plate 3 is also arranged between the tetrafluoro soft plate 2 and the copper foil plate 7.
An external thread is processed on an external cylindrical surface at the upper part of the base 9; an internal thread is also processed on the inner column surface of the step hole at the lower part of the cover 1; the cover 1 is screwed to the upper portion of the base 9.
The wall of the upper part of the base 9 is provided with more than one screw hole, and the pressure sensor fixing seat 5 is fixed by a set screw 4 screwed in the screw hole.
The base 9 and the cover 1 are made of copper or aluminum alloy or other metal materials, and the inner surface and the outer surface of the base 9 and the cover 1 are coated with Teflon coating.
On the inner step of the base 9, a ground wire fixing screw hole is opened, and the ground wire in the pressure sensor signal cable 10 is connected to the base 9 by a ground wire fixing screw 6.
The pressure sensor assembly for the microwave digestion device is characterized in that the pressure sensor is arranged in a metal box formed by a base and a cover, so that the pressure sensor assembly is relatively simple in structure; meanwhile, the inner surface and the outer surface of the base and the cover are coated with Teflon coatings, and the exposed surface of the pressure sensor is provided with a pressure sensor surface protection layer group, so that the corrosion resistance is better; in addition, the protective layer contacted with the ceramic surface of the pressure sensor adopts a copper foil plate, and the thermal expansion coefficients of the ceramic and the copper are almost the same, so that the occurrence of great pressure deviation can be avoided, and the sensing precision is higher.
Drawings
FIG. 1 is a schematic view in principal section of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is an enlarged schematic view of a portion K of the present invention;
fig. 4 is an exploded isometric view of the present invention.
In the figure:
the pressure sensor comprises a cover 1, a tetrafluoro soft board 2, an aluminum foil board 3, a set screw 4, a pressure sensor fixing seat 5, a ground wire fixing screw 6, a copper foil board 7, a pressure sensor 8, a base 9 and a pressure sensor signal cable 10.
Detailed Description
The invention is further described below with reference to the drawings and examples. The following description is by way of example only, and the scope of the invention should not be limited thereto.
The pressure sensor assembly for the microwave digester of the embodiment is composed of a pressure sensor 8, a pressure sensor signal cable 10, a base 9, a cover 1, a pressure sensor fixing seat 5 and a pressure sensor surface protection layer group.
The pressure sensor 8 is a cake-shaped ceramic pressure sensor, and the lower surface of the pressure sensor is connected with the lead-in end of the pressure sensor signal cable 10.
The base 9 is a short cylinder with a double inner step blind hole in the middle; a ground wire fixing screw hole is formed in the lower step of the blind hole, and a ground wire in the pressure sensor signal cable 10 is connected to the base 9 through a ground wire fixing screw 6; external threads are processed on an external cylindrical surface at the upper part of the base 9; two (two in this example, one or three or other numbers) fastening screw holes are formed in the seat wall at the upper part of the base 9; a radial hole for threading the pressure sensor signal cable 10 is formed in the base wall at the lower part of the base 9.
The cover 1 is a short cylinder with a bidirectional inner step through hole, and the inner hole wall of the inner step at the lower part of the short cylinder is provided with an inner thread matched with the outer thread on the outer cylindrical surface at the upper part of the base 9.
The base 9 and the cover 1 are made of aluminum alloy (other metals or alloys can be adopted) and the inner surface and the outer surface of the base and the cover are coated with Teflon coating for corrosion prevention.
The pressure sensor fixing seat 5 is a short cylinder with an outer step at the upper part and an inner step through hole at the lower part.
The pressure sensor surface protection layer group is a three-layer protection layer group formed by a tetrafluoro soft board 2, an aluminum foil board 3 and a copper foil board 7 from top to bottom.
When in assembly, the pressure sensor 8 is firstly arranged in the inner step through hole of the pressure sensor fixing seat 5, and the pressure sensor signal cable 10 downwards penetrates out of the through hole and the radial hole on the seat wall at the lower part of the base 9; thereafter, the ground fixing screw 6 is screwed to the ground fixing screw hole, thereby connecting the ground of the pressure sensor signal cable 10 to the base 9. Then, the pressure sensor fixing seat 5 is placed in the blind hole of the inner step of the base 9, the bottom surface of the pressure sensor fixing seat is propped against the inner step of the lower part of the base 9, the outer step of the upper part of the pressure sensor fixing seat is propped against the step of the upper part of the base 9, then the set screw 4 is screwed into the screw hole on the wall of the upper part of the base 9, and the end part of the set screw 4 is propped against the outer column surface of the pressure sensor fixing seat 5, so that the pressure sensor fixing seat 5 is fixed; then, a copper foil plate 7 (the diameter of the copper foil plate 7 is larger than the diameter of the step through hole in the pressure sensor fixing seat 5 and smaller than the diameter of the upper end surface of the pressure sensor fixing seat 5) is covered on the pressure sensor 8, so that the copper foil plate 7 and the ceramic surface of the pressure sensor 8 are tightly attached together; then, an aluminum foil plate 3 (the diameter of the aluminum foil plate 3 is larger than the diameter of the upper part of the double inner step blind hole of the base 9 and smaller than the outer diameter of the upper end surface of the base 9) is covered on the copper foil plate 7; covering the aluminum foil plate 3 with a tetrafluoro soft plate 2 (the diameter of the tetrafluoro soft plate 2 is larger than that of the aluminum foil plate 3 and smaller than the outer diameter of the upper end surface of the base 9) to form a three-layer protective layer group; thereafter, the cap 1 is screwed onto the upper portion of the base 9, and the inner step of the lower portion of the cap 1 is pressed against the tetrafluoro-flex plate 2 to form a seal.
Before use, the pressure sensor assembly for the microwave digester of this embodiment is placed in the digester tank and an anti-corrosion column in the tank is allowed to contact the tetrafluoro flexible sheet 2.
In the use process, microwaves generated by the microwave digestion device act in a digestion tank with strong acid and strong alkali to react with a sample, and the temperature in the digestion tank is continuously increased to enhance the air pressure; after the air pressure in the tank is increased, the bottom of the digestion tank body can generate tiny deformation, the corrosion-resistant columns are pushed to extrude the tetrafluoro soft board 2, then the corrosion-resistant columns are transmitted to the aluminum foil board 3, the copper foil board 7 and the ceramic surface of the pressure sensor 8, tiny voltage is generated after the ceramic of the pressure sensor 8 is pressed and transmitted to the circuit board inside the pressure sensor 8, the sensed pressure is accurately converted into a specific pressure value, and then the specific pressure value is transmitted out through the pressure sensor signal cable 10 for monitoring in the digestion process.
Because the thermal expansion coefficients of the ceramics and the copper are almost the same, the great deviation of pressure can be avoided, and the contact of the ceramic surfaces of the tetrafluoro soft board 2, the aluminum foil board 3 and the copper foil board 7 is tight, even if three layers of protection are adopted, the pressure sensor can still detect weak voltage of the pressure sensor under the condition that microwaves exist in the microwave digestion device, and the precision requirement can be ensured.
The pressure sensor assembly for the microwave digester is used for detecting heavy metals or other harmful substances in a laboratory.
Claims (5)
1. A pressure sensor assembly for a microwave digester includes a pressure sensor (8) and a pressure sensor signal cable (10); the method is characterized in that: the device also comprises a base (9), a cover (1), a pressure sensor fixing seat (5) and a pressure sensor surface protection layer group; the pressure sensor fixing seat (5) is arranged in a step blind hole in the middle of the base (9), the pressure sensor (8) is arranged in a step through hole in the middle of the pressure sensor fixing seat (5), and a pressure sensor signal cable (10) connected with the bottom surface of the pressure sensor (8) passes through a through hole below the pressure sensor fixing seat (5) and then passes through a radial hole at the lower part of the base (9); the pressure sensor surface protection layer is arranged on the base (9), and the cover (1) with the step through hole in the middle is sleeved on the upper part of the base (9);
The pressure sensor surface protection layer group comprises a tetrafluoro soft board (2) and a copper foil board (7), wherein the copper foil board (7) is tightly attached to the ceramic surface of the pressure sensor (8), and the tetrafluoro soft board (2) is arranged on the copper foil board (7); the pressure sensor (8) is a cake-shaped ceramic pressure sensor;
the base (9) and the cover (1) are made of copper or aluminum alloy or other metal materials, and the inner surface and the outer surface of the base (9) and the inner surface and the outer surface of the cover (1) are coated with Teflon coatings.
2. The pressure sensor assembly for a microwave digester as claimed in claim 1, wherein: an aluminum foil plate (3) is arranged between the tetrafluoro soft plate (2) and the copper foil plate (7).
3. A pressure sensor assembly for a microwave digester as claimed in claim 2, wherein: an external thread is processed on an external cylindrical surface at the upper part of the base (9); an internal thread is also processed on the inner column surface of the step hole at the lower part of the cover (1); the cover (1) is screwed on the upper part of the base (9).
4. A pressure sensor assembly for a microwave digester according to claim 3, characterised in that: the wall of the upper part of the base (9) is provided with more than one screw hole, and the pressure sensor fixing seat (5) is fixed by a set screw (4) screwed in the screw hole.
5. The pressure sensor assembly for a microwave digester as claimed in claim 4, wherein: on the inner step of the base (9), a ground wire fixing screw hole is formed, and a ground wire in the pressure sensor signal cable (10) is connected to the base (9) by a ground wire fixing screw (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811173140.3A CN109238552B (en) | 2018-10-09 | 2018-10-09 | Pressure sensor assembly for microwave digestion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811173140.3A CN109238552B (en) | 2018-10-09 | 2018-10-09 | Pressure sensor assembly for microwave digestion device |
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| CN109238552A CN109238552A (en) | 2019-01-18 |
| CN109238552B true CN109238552B (en) | 2024-10-22 |
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| CN201811173140.3A Active CN109238552B (en) | 2018-10-09 | 2018-10-09 | Pressure sensor assembly for microwave digestion device |
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| CN120685229B (en) * | 2025-08-22 | 2025-11-25 | 克拉玛依市圣起钻采设备有限责任公司 | Integrated sensing protection device and automatic balance beam pumping unit |
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| CN106017787A (en) * | 2016-07-06 | 2016-10-12 | 济南海能仪器股份有限公司 | Anticorrosion pressure transducer |
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| JP3260597B2 (en) * | 1995-08-04 | 2002-02-25 | 日本特殊陶業株式会社 | Plug with pressure sensor |
| US7383737B1 (en) * | 2007-03-29 | 2008-06-10 | Delphi Technologies, Inc | Capacitive pressure sensor |
| CN201653787U (en) * | 2010-03-19 | 2010-11-24 | 上海新拓分析仪器科技有限公司 | Non-contact pressure measuring device and chemical digestion equipment |
| CN102065634A (en) * | 2011-01-05 | 2011-05-18 | 倪新军 | LED high-frequency aluminum-based circuit board |
| CN103968975B (en) * | 2014-05-07 | 2016-03-02 | 衢州学院 | Based on the anti-corrosion pressure transducer of PDMS pressure drag and stainless steel electric capacity |
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| CN204855080U (en) * | 2015-06-08 | 2015-12-09 | 伊玛精密电子（苏州）有限公司 | Corrosion -resistant type all -metal pressure sensor |
| CN205904621U (en) * | 2016-07-07 | 2017-01-25 | 上海华培动力科技有限公司 | Pretightning force laser welding frock |
| CN205937803U (en) * | 2016-08-16 | 2017-02-08 | 长沙永乐康仪器设备有限公司 | Automatic pressure release container blocks water |
| CN107487043A (en) * | 2017-07-07 | 2017-12-19 | 周丽 | A kind of polyfluortetraethylealuminum aluminum base copper-clad laminate of advantages of good shielding performance |
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| CN101800093A (en) * | 2010-03-18 | 2010-08-11 | 钱秋英 | Externally-sleeved insulated sleeve |
| CN106017787A (en) * | 2016-07-06 | 2016-10-12 | 济南海能仪器股份有限公司 | Anticorrosion pressure transducer |
| CN208704946U (en) * | 2018-10-09 | 2019-04-05 | 长沙永乐康仪器设备有限公司 | A kind of pressure sensor assembly of microwave eliminating device |
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