CN201196596Y - Low-pressure gauge used for hazardous gas security measurement - Google Patents
Low-pressure gauge used for hazardous gas security measurement Download PDFInfo
- Publication number
- CN201196596Y CN201196596Y CNU2007201910071U CN200720191007U CN201196596Y CN 201196596 Y CN201196596 Y CN 201196596Y CN U2007201910071 U CNU2007201910071 U CN U2007201910071U CN 200720191007 U CN200720191007 U CN 200720191007U CN 201196596 Y CN201196596 Y CN 201196596Y
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- China
- Prior art keywords
- stainless steel
- ring
- radioactive source
- intensifying ring
- ceramic lead
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Abstract
The utility model discloses a low pressure gauge structure for measuring the safety of a hazardous gas. The gauge consists of a radioactive source, a collector electrode, an intensifying ring, a housing, an end cap, a stainless steel plate, a bench insulator, a flange base, an indium filament metal seal ring, a connecting bolt, a connecting screw, ceramic lead wire and an electrode assembly. An external device charges the direct current voltage from a voltage output end to the intensifying ring through the ceramic lead wire and the stainless steel plate which are fixed on the electrode assembly. The intensifying ring is positioned above the bench insulator. The bench insulator is positioned on the bottom of an inner cavity. The ceramic lead wire and the intensifying ring are respectively connected to two ends of the stainless steel plate by welding. The collector electrode is positioned on the axle wire of the inner cavity. The radioactive source is spot welded to the inner wall surface of the intensifying ring, and the inner wall surface adopts the collector electrode as an axle center. The electrode assembly is welded to two holes on the flange base. The ceramic lead wire runs through the electrode assembly to be connected to the external device. The housing is fixed to the flange base through the connecting bolt and the indium filament metal seal ring. The gauge is high in measurement accuracy, and explosion proof, and can be used for the measurement in a low temperature environment.
Description
Affiliated technical field
The utility model relates to a kind of low-pressure gauge that is used for hazardous gas security measurement, can be used on pressure survey in the low vacuum system under inflammable and explosive and the low temperature environment.
Technical background
Liquefied gas at low temp as liquid hydrogen, liquid oxygen and liquefied natural gas (LNG) etc., adopts the Cryo Heat Insulation pressure vessel to store and transport usually at present.Weigh a force value that important indicator is its vacuum interlayer of Cryo Heat Insulation pressure vessel performance.After the vacuum interlayer pressure of Cryo Heat Insulation pressure vessel surpassed certain value, the heat-insulating property of product will obviously descend, and must carry out depot repair.On the other hand, for storing and transport inflammable and explosive liquefied gas at low temp, the vacuum interlayer if flammable explosive gas bleeds runs into the danger that also has blast behind the naked light.Thermopair vacuum gauge, heat conduction vacuum gauge and the hot cathode ioization gauge etc. that are used for low-vacuum measurement at present, generally need to produce heavy current or high voltage during its work, on the other hand, these vacuum gauges generally adopt rubber ring or oxygen-free copper pad to realize vacuum seal, these vacuum gauges are used for the measurement of Cryo Heat Insulation pressure vessel laminated vacuum pressure, be easy to generate the problem of naked light and leakage, have potential safety hazard.
The utility model content
Technology of the present utility model is dealt with problems and is: overcome the deficiencies in the prior art, provide a kind of simple in structure, measuring accuracy is high, volume is little, explosion-proof, can be used for the vacuum gauge that the low temperature environment vacuum pressure is measured.
Technical solution of the present utility model is: a kind of low-pressure gauge that is used for hazardous gas security measurement, its characteristics are: it is made up of radioactive source, collector, intensifying ring, shell, end cap, stainless steel substrates, insulating base, flange seat, indium metal silk O-ring seal, coupling bolt, attachment screw, ceramic lead and electrode assemblie.
Wherein, described radioactive source adopts the tritiated titanium target radioactive source, and radioactivity is 1Ci, is the rectangle stainless steel substrates of 30mm * 10mm * 0.1mm; It is that φ 30mm, wall thickness are the stainless steel cylinder of 0.2mm that intensifying ring adopts diameter, need add the 100V DC voltage during work of radioactive ionization gauge rule; The material that indium metal silk O-ring seal adopts is an indium metal.
Annexation of the present utility model is: external device (ED) adds to DC voltage on the intensifying ring by ceramic lead and the stainless steel substrates that is fixed on the electrode assemblie from voltage output end.Quicken the very cylinder of a up/down perforation, be positioned at the top of inner chamber insulating base, link to each other with insulating base by attachment screw.Insulating base is positioned at the bottom of inner chamber, fixes by screw and flange seat; Ceramic lead links to each other with the stainless steel substrates two ends respectively by welding with intensifying ring.Charged intensifying ring provides DC voltage to make intensifying ring and form an electric field space between the collector on the inner chamber axis, and the volume of this electric field space and the ratio of cavity volume are 2:5; Collector is positioned on the axis of inner chamber, links to each other with ceramic lead with welding manner by stainless steel substrates; Radioactive source is welded to on the intensifying ring internal face of collecting axle center very, and according to the difference of measurement range, radioactive source is more than one; Two eyelet weldings connect on electrode assemblie and the flange seat, and ceramic lead passes electrode assemblie and links to each other with external device (ED); Housing parts is fixed by coupling bolt and indium metal silk O-ring seal and flange seat.
The method of operation of the present utility model is: external device (ED) is added in DC voltage on the intensifying ring, and charged intensifying ring provides DC voltage to make and forms an electric field space between intensifying ring and the collector.The β particle that radioactive source produces is ionized into positive ion with the gas molecule of test environment, positive ion under the effect of electric field force directed movement to collector, be collected extremely collected, form the small and weak current signal of a microampere magnitude, this current signal transmits back external device (ED) by stainless steel substrates and ceramic lead.External device (ED) finally converts current signal to force value by its inner converting unit.
Principle of work of the present utility model is: the β particle that produces by radioactive source carries out ionization to the gas molecule in the test environment, the DC voltage that intensifying ring provides makes and forms an electric field space between collector and intensifying ring, the positive ion that ionization produces finally accumulates on the collector under the effect of electric field force, form the small and weak current signal of a microampere magnitude, when the survey ambient pressure variations, the current signal value that produces also changes thereupon, and in the low vacuum scope, change according to linear scaling between the two, therefore can reach the purpose of measuring low vacuum pressure by the current signal that the measurement collection utmost point produces.
The utility model advantage compared with prior art is: the utility model is owing to adopt the method replacement employing tested gas of hot filament ionization of the tested gas of radioactive source ionization or utilize heat conduction, thermocouple principle to measure the method for test environment gaseous tension, adopt low temperature resistant indium metal silk O-ring seal to replace common rubber seal or oxygen-free copper O-ring seal to seal, have advantages such as no thermal source, explosion-proof and low temperature environment time use.
Description of drawings
Fig. 1 is a structural representation block diagram of the present utility model.
Among the figure: 1-radioactive source, 2-collector, 3-intensifying ring, 4-shell, 5-end cap, 6-stainless steel substrates, 7-insulating base, 8-flange seat, 9-indium metal silk O-ring seal, 10-coupling bolt, 11-attachment screw, 12-ceramic lead, 13-electrode assemblie.
Embodiment
As shown in Figure 1, be product structure synoptic diagram of the present utility model, it is made up of radioactive source (1), collector (2), intensifying ring (3), shell (4), end cap (5), stainless steel substrates (6), insulating base (7), flange seat (8), indium metal silk O-ring seal (9), coupling bolt (10), attachment screw (11), ceramic lead (12) and electrode assemblie (13).During product work, the β particle that radioactive source (1) produces carries out ionization to the tested gas in intensifying ring (3) space, the effect of intensifying ring (3) is to apply the 100V DC voltage, make and between intensifying ring (3) and collector (2), form an electric field space, under the effect of electric field force, the positive ion that ionization produces can arrive on the collector (2) in directed movement, is collected the utmost point (2) and collects, and forms the small and weak current signal of a microampere magnitude.There is linear relationship in this small and weak current signal at the pressure of low vacuum scope and test environment, therefore, promptly can realize the measurement function of test environment gaseous tension by measuring this signal.Shell (4) and flange seat (8) form the pressure survey space of a sealing, the gas of system under test (SUT) can be incorporated in intensifying ring (3) space, form stable atmosphere, play the shielding radioactive source simultaneously, prevent that radioactive source from leaking, and eliminates the potential safety hazard of product.Insulating base (7) is used for fixing intensifying ring (3), and forms electrical isolation between intensifying ring (3) and flange seat (8).Indium metal silk O-ring seal (9) plays the vacuum seal effect, prevents the ambient atmos measured system of bleeding.Coupling bolt (10) plays a part to connect shell (4) and flange seat (8), adopts this structure to be easy for installation and maintenance.Ceramic lead (12) is used for the measurement that applies the small and weak current signal that produces with collector of 100V DC voltage, and ceramic lead (12) can reduce the small and weak electric current leaky generation on the collector, the raising measuring accuracy with the ceramic material of high impedance.
Claims (5)
1. low-pressure gauge that is used for hazardous gas security measurement, it comprises radioactive source, collector, intensifying ring, shell, end cap, stainless steel substrates, insulating base, flange seat, indium metal silk O-ring seal, coupling bolt, attachment screw, ceramic lead and electrode assemblie; It is characterized in that: external device (ED) adds to DC voltage on the intensifying ring by ceramic lead and the stainless steel substrates that is fixed on the electrode assemblie from voltage output end; Quicken the very cylinder of a up/down perforation, be positioned at the top of inner chamber insulating base, link to each other with insulating base by attachment screw; Insulating base is positioned at the bottom of inner chamber, fixes by screw and flange seat; Ceramic lead links to each other with the stainless steel substrates two ends respectively by welding with intensifying ring; Charged intensifying ring provides DC voltage to make intensifying ring and form an electric field space between the collector on the inner chamber axis, and the volume of this electric field space and the ratio of cavity volume are 2:5; Collector is positioned on the axis of inner chamber, links to each other with ceramic lead with welding manner by stainless steel substrates; Radioactive source is welded to on the intensifying ring internal face of collecting axle center very; Two eyelet weldings connect on electrode assemblie and the flange seat, and ceramic lead passes electrode assemblie and links to each other with external device (ED); Shell is fixed by coupling bolt and indium metal silk O-ring seal and flange seat.
2. a kind of low-pressure gauge that is used for hazardous gas security measurement according to claim 1, its radioactive source is characterised in that: radioactive source is more than one.
3. a kind of low-pressure gauge that is used for hazardous gas security measurement according to claim 1, its intensifying ring is characterised in that: adopting diameter is that φ 30mm, wall thickness are the stainless steel cylinder of 0.2mm, need add the 100V DC voltage during work of radioactive ionization gauge rule.
4. a kind of low-pressure gauge that is used for hazardous gas security measurement according to claim 1, its indium metal silk O-ring seal is characterised in that: the material of employing is an indium metal.
5. a kind of low-pressure gauge that is used for hazardous gas security measurement according to claim 1, its radioactive source is characterised in that: radioactive source adopts the tritiated titanium target radioactive source, and radioactivity is 1Ci, is the rectangle stainless steel substrates of 30mm * 10mm * 0.1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201910071U CN201196596Y (en) | 2007-12-28 | 2007-12-28 | Low-pressure gauge used for hazardous gas security measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201910071U CN201196596Y (en) | 2007-12-28 | 2007-12-28 | Low-pressure gauge used for hazardous gas security measurement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201196596Y true CN201196596Y (en) | 2009-02-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201910071U Expired - Fee Related CN201196596Y (en) | 2007-12-28 | 2007-12-28 | Low-pressure gauge used for hazardous gas security measurement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201196596Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101937751A (en) * | 2010-06-18 | 2011-01-05 | 中国科学院电工研究所 | Low-temperature superconduction current lead sealing device |
| CN101470040B (en) * | 2007-12-28 | 2011-05-25 | 中国航天科技集团公司第五研究院第五一〇研究所 | Low-pressure gauge used for hazardous gas security measurement |
-
2007
- 2007-12-28 CN CNU2007201910071U patent/CN201196596Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101470040B (en) * | 2007-12-28 | 2011-05-25 | 中国航天科技集团公司第五研究院第五一〇研究所 | Low-pressure gauge used for hazardous gas security measurement |
| CN101937751A (en) * | 2010-06-18 | 2011-01-05 | 中国科学院电工研究所 | Low-temperature superconduction current lead sealing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090218 Termination date: 20100128 |