CN102092938B - Glass used for liquid level observation window of level gauge and level gauge - Google Patents
Glass used for liquid level observation window of level gauge and level gauge Download PDFInfo
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- CN102092938B CN102092938B CN 201010297808 CN201010297808A CN102092938B CN 102092938 B CN102092938 B CN 102092938B CN 201010297808 CN201010297808 CN 201010297808 CN 201010297808 A CN201010297808 A CN 201010297808A CN 102092938 B CN102092938 B CN 102092938B
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Abstract
The invention provides a glass used for a liquid level observation window of a level gauge and a level gauge, which are advantaged by no corrosion in long-term use and excellent alkali resistance. In the glass used for the liquid level observation window of the level gauge, the level gauge uses a liquid column to represent a liquid level, and the liquid level is observed via observation of the liquid column via the liquid level observation window, the glass used for the liquid level observation window of the level gauge is characterized by comprising: 20-30wt% of SiO2, 15-20 wt% of Al203, 25-30 wt % of Y2O3, 15-20wt% of La2O3, 4-10wt% of TiO2, and 5-10wt% of ZrO2.
Description
Technical field
The present invention relates to a kind of glass of window of the demonstration liquid level for liquid level meter, particularly the glazing of the liquid level meter of alkali resistance excellence.
Background technology
In prior art, be provided with the liquid level meter for the observation liquid level on the water tank in boiler and workshop.
Liquid level meter comprises reflex level gauge or perspective formula liquid level meter etc., their utilize the fluid column of the liquid level meter be connected with water tank to show the liquid level of the water tank of boiler etc., the window (observation window of liquid level) that sees through on the front that is arranged on liquid level meter is watched fluid column, observes thus liquid level.
The glass that embeds the character with anti-liquid level meter working conditions in the hole of above-mentioned window on being formed at the liquid level meter main body consists of, for example, see through window and watch along the liquid level that moves up and down in liquid level meter, can monitor safely the liquid level of boiler under the condition such as High Temperature High Pressure etc.
Liquid level meter as mentioned above has the liquid level meter of record in patent documentation 1 for example.
The liquid level meter of putting down in writing in patent documentation 1 by the liquid level meter main body, form the liquid level meter glass of window and liquid level meter glass be fixed liquid level meter shell on the liquid level meter main body and gasket seal etc. and consist of.
The conditions such as the pressure of the boiler that connects according to liquid level meter etc. and temperature, the differences such as the material of the component parts of liquid level meter, structure, and the different liquid level meter glass that is used for window such as used thickness and composition.
In addition, under the situation of the liquid level meter of the boiler that is used for High Temperature High Pressure etc., for the corrosion to liquid level meter glass of the boiler water storage of the water and steam that prevents high temperature and high pH value (10～11), and on liquid level meter glass and saturated surface that liquid contacts, mica is installed.
Further; when the liquid in water tank is alkalescence; install on the saturated surface of liquid level meter glass with the same printing opacity of glass and have alkali-proof Teflon (registered trademark) plate; or at protective membranes such as direct coating Teflons on glass and form guard block, so that liquid level meter glass does not contact with alkaline liquid.
As having alkali resistance, stable on heating guard block, record by the materials such as fluoro-resin are carried out the parts that forming process forms in patent documentation 1.
As mentioned above; under the situation of the liquid level meter that sees through window supervision fluid column; liquid level meter glass by conditions such as use high temperature high voltage resistants; and for the corrosion that prevents liquid level meter glass, mica is installed or is had alkali resistance corrosion protection plate or at coating protective membrane on glass, and guarantee the weather resistance of the window part of liquid level meter.
[patent documentation 1] Japanese kokai publication hei 7-19929 communique
Summary of the invention
But, when as mentioned above, when the corrosion protection plate of the installed inside alkali resistance excellence of liquid level meter glass etc., the pad that existence need to be protected these parts, and make assembling become complicated, increase the problems such as cost because using the guard blocks such as corrosion protection plate.
In addition, even use liquid level meter glass, corrosion protection plate as above is installed in addition, when long-time the use, can not be prevented the corrosion of corrosion protection plate fully, need to regularly replace the corrosion protection plate that is arranged on liquid level meter.
In order to change the corrosion protection plate, need the dismounting liquid level meter, therefore in window, liquid level meter glass is installed other the guard block such as corrosion protection plate in addition, at this moment, need accurate field engineering in order to prevent leak of liquid, make on the contrary and change operation and become loaded down with trivial details.
Therefore; the liquid level meter glass that needs a kind of liquid level meter to use; when not using Teflon plate or mica etc. to have alkali-proof guard block with the split of liquid level meter glass, even independent liquid level meter glass also can make the good and excellent in te pins of durability of the chemical stabilities such as alkali resistance.
Thereby the object of the invention is to provide a kind of observation window of liquid level glass of liquid level meter, even long-time use also can make the corrosion of liquid level meter glass few, and alkali resistance is excellent.
In order to solve above-mentioned problem, the observation window of liquid level of liquid level meter of the present invention is with in glass, described liquid level meter utilizes fluid column to represent liquid level, and observe described liquid level by watch described fluid column through observation window of liquid level, the observation window of liquid level of described liquid level meter is characterised in that with glass, contains: the SiO of 20～30wt%
2, 15～20wt% Al
2O
3, 25～30wt% Y
2O
3, 15～20wt% La
2O
3, 4～10wt% TiO
2, 5～10wt% ZrO
2
According to the present invention, can access the liquid level meter glass of alkali resistance excellence, excellent in te pins of durability.
Especially, under the situation of the liquid level meter of observing liquid level, need to correctly observe liquid level through observation window of liquid level, if thereby observation window of liquid level with the surface corrosion of glass, identifiability is brought impact.
But, according to the present invention, even when using under the environment of high-temperature high pressure water or in alkaline liquid, can suppress the saturated surface corrosion that observation window of liquid level is used glass, the life-time service identifiability can not descend yet.
In addition; according to observation window of liquid level glass of the present invention; guard blocks such as having alkali-proof corrosion protection plate need to be set in addition in liquid level meter, thereby compare cost with the situation that guard block must be set low, can alleviate the burden of liquid level meter being carried out upkeep operation.
Description of drawings
Fig. 1 makes the sectional view of the liquid level meter of embodiment of the present invention.
Nomenclature
1 liquid level meter 2 liquid level meter main body 4a, 4b window
6a, 6b liquid level meter shell 10 liner pad 12 gasket seals
G liquid level meter glass
Embodiment
Below, the liquid level meter glass G that uses glass as the observation window of liquid level of liquid level meter is described.
At first, the structure of the liquid level meter 1 of the liquid level meter glass G that has utilized present embodiment is described according to Fig. 1.
Fig. 1 is the cross-sectional view of liquid level meter 1.
And, the liquid level meter 1 of present embodiment makes the Clairvoyant type liquid level meter, be formed with window 4a, 4b through a plurality of circles of light on its front and the back side, utilize and penetrate into the light of front from the back side of liquid level meter 1 from this window 4a, 4b, can watch the fluid column in liquid level meter 1.
Below, the assembling procedure of liquid level meter 1 is described.
At first, on the front and the back side of liquid level meter main body 2, be formed with the front that connects liquid level meter main body 2, the communicating pores at the back side at the part place that will have an X-rayed fluid column, be formed with a pile embedded groove 20 that can embed liquid level meter glass G at this.
Across gasket seal 12, liquid level meter glass G is embedded in this embedded groove 20.
Then, liner pad 10 is clipped between liquid level meter glass G and liquid level meter shell 6a, 6b, under this state, liquid level meter shell 6a, 6b is fixed in liquid level meter main body 2.
Due to the fixedly embedded liquid level meter glass G of needs, so that liquid can not leak from hermetic unit between liquid level meter main body 2 and liquid level meter glass G, therefore utilize fixing part 8a, the 8b such as screw securely liquid level meter shell 6a, 6b to be fixed.
On liquid level meter shell 6a, the 6b of the liquid level meter 1 of assembling as mentioned above, be formed with circular port 60a, 60b in order to form window 4a, 4b, can see through the liquid level meter glass G that is fixed between this circular port 60a, 60b and liquid level meter main body 2 and observe fluid column.
In consisting of as mentioned above liquid level meter 1, light penetrates into the front from the back side of liquid level meter 1, can see through window and observe fluid column.
And, in the liquid level meter 1 of present embodiment, be circular window to window 4a, the 4b that observes liquid level, and liquid level meter glass G is illustrated for circular situation, but, be not limited to this, certainly also can be applicable to make liquid level meter glass G is elongate windows, and makes situation about can observe continuously along liquid level change through window.
In the situation that window is elongate windows, can make the form fit of liquid level meter glass G and elongate windows form elongated shape.
Then, liquid level meter glass G that use in window 4a, the 4b of liquid level meter 1 described above, present embodiment is elaborated.
Because the liquid level meter glass G alkali resistance of present embodiment is excellent, therefore need to be at the face that contacts with fluid column of liquid level meter glass G, i.e. the guard blocks such as the upper installation of saturated surface G1 corrosion protection plate.
The following describes this liquid level meter glass G.
The liquid level meter glass G of present embodiment contains, the SiO of 20～30wt%
2, 15～20wt% Al
2O
3, 25～30wt% Y
2O
3, 15～20wt% La
2O
3, 4～10wt% TiO
2, 5～10wt% ZrO
2
SiO
2The necessary composition of vitrifying as network former.
Content is preferably 20～30wt%.Be difficult to vitrifying if be less than 20wt%; Unnecessary 30wt% alkali resistance descends.
Al
2O
3To reduce the necessary composition of glass melting temperature.
Content is preferably 15～20wt%.
Al
2O
3Content when being less than 15wt%, happy and harmonious temperature uprises; During unnecessary 20wt%, alkali resistance descends.
Y
2O
3To improve the necessary composition of alkali resistance.
Content is preferably 25～30wt%.
Be less than alkali resistance decline of 25wt%; Unnecessary 30wt% is difficult to vitrifying, and devitrification easily occurs.
La
2O
3With Y
2O
3Equally, be to improve the necessary composition of alkali resistance.
Content is preferably 15～20wt%.
Be less than alkali resistance decline of 15wt%; Unnecessary 20wt% is difficult to vitrifying, and devitrification easily occurs.
Further, the liquid level meter glass G of present embodiment is by making Y
2O
3And La
2O
3Content be above-mentioned scope, make on the saturated surface G1 of liquid level meter glass G and alkaline solution, even because white opacity temporarily occurs alkaline solution, light transmission descends, and also can peel off the thin film layer of this white opacity, reproduces the glass surface with light transmission.
Thus, even when liquid level meter glass G contacts with basic solution, also can keep for a long time light transmission, obtain being suitable for the liquid level meter glass of the level gauging of alkaline solution.
TiO
2To reduce the necessary composition of thermal expansivity.
Content is preferably 4～10wt%.
Be less than the effect that 4wt% can not get reducing thermal expansivity, unnecessary 10wt% alkali resistance descends.
ZrO
2To improve the necessary composition of alkali resistance.
Content is preferably 5～10wt%.
Can not get alkali-proof effect if be less than 5wt%, if unnecessary 10wt% is because of ZrO
2Fusing point (2715 ℃) is high and be difficult to vitrifying.
The liquid level meter glass G of present embodiment satisfies above condition, still, so long as satisfy this condition, can suitably contain the common composition (B that uses when making physics and chemistry with glass such as grade
2O
3Deng).
Further preferred liquid level meter glass of the present invention meets the following conditions.
At first, preferred mechanical intensity is stipulated (mechanical properties) according to JIS B8286 (2005) pressurized vessel with bezel, and flexural strength is 200N/mm
2Above.
If less than 200N/mm
2Have problems at secure context with liquid level meter glass as high pressure.
In addition, the liquid level meter glass G thermal expansivity of preferred present embodiment is 40 * 10
-7～60 * 10
-7/ ℃.
If less than 40 * 10
-7If/℃ the problem that exists flexural strength to descend is greater than 60 * 10
-7/ ℃ exist to be difficult to carry out tempering and to process (air-cooled intensive treatment), the problem that resistance to sudden heating descends.
In addition, the liquid level meter glass G of preferred present embodiment, the reduction rate of measuring to estimate the chemical-resistant powder method is below 0.5wt% for basic solution.
Alkali resistance is not enough if reduction rate surpasses 0.5wt%.
As the test of expression chemical-resistant, the chemical resistant properties measuring method (powder method) based on the opticglass of Japanese opticglass industry meeting standard (JOGIS06-1999) is for example arranged.
This chemical-resistant measuring method is, when measuring water tolerance, with sample (the volume 1cm of proportion weight part
3) glass powder (particle size 425～600 μ m) be immersed in the water more than 99 ℃ 60 minutes, when measuring acid resistance, this sample is immersed in the nitric acid of 0.01N 60 minutes, measure respectively the weight reduction after dipping.
The alkali-proof above-mentioned reduction rate of the liquid level meter glass G of expression present embodiment is, in accordance with the chemical-resistant measuring method of Japanese opticglass industry meeting standard, the value of measuring after the powdered sample effect alkaline solution to liquid level meter glass G.
Be specially, liquid level meter glass G be immersed in the NaOH aqueous solution 500ml of 2 regulations (N), dipping is 48 hours under the condition of 95 ℃ ± 1 ℃, then measures the reduction of the quality of historical data, tries to achieve thus alkali-proof reduction rate.
And the quality change of sample is measured and is accurate to 0.1mg.
For the liquid level meter glass G of present embodiment, utilize the reduction rate of above-mentioned test determination for below 0.5wt%, can fully satisfy desired alkali resistance when being used for liquid level meter.
In addition, the liquid level meter glass G of preferred present embodiment, even in the situation that the effect basic solution, the optical properties such as perviousness descend seldom, so as can be correct watch liquid level.
Carrying out following test in the evaluation that optical property is kept, is dipping 120 days in the NaOH aqueous solution 2000ml of 30%, 20 ℃ with liquid level meter glass G at mass percent concentration, observes the identifiability before and after its dipping.
To the liquid level meter glass G of present embodiment, after acting on alkaline solution in the above conditions, identifiability does not descend, can be as the liquid level meter glass life-time service of liquid level meter.
As mentioned above, the liquid level meter glass alkali resistance of present embodiment is excellent, and desired light transmission when can long term maintenance being used for the perspective glazing of liquid level meter.
Therefore, be applicable to the perspective glazing of liquid level meter that the liquid level of alkaline solution is measured.
And, in the present embodiment, at the front of liquid level meter main body 2 and the back side, window is set and makes light transmission seeing through, thereby the perspective formula liquid level meter that can observe liquid level is illustrated with liquid level meter glass G, but, the present invention is not limited thereto, can use too liquid level meter glass G in reflex level gauge.
In reflex level gauge, saturated surface side at liquid level meter glass is formed with a plurality of pods, when light incides window, partly locates light at gas and is presented silvery white by the reflection of the pod of glass, present black in liquid portion place light continues to incide liquid, can utilize this phenomenon to observe liquid level.
Therefore, by cut out a plurality of pods on the liquid level meter glass G of present embodiment, can be used in equally the liquid level meter glass that reflection makes liquid level meter.
Thereby, can with the liquid level meter glass G of present embodiment, be easy to maintenance, used in reflex level gauge cheaply.
[embodiment]
Below, the embodiment of liquid level meter glass of the liquid level meter of present embodiment is described.
Table 1 illustrates composition and the solid state properties value of each embodiment and the comparative example of actual fabrication.
In addition, to these embodiment and comparative example, carry out the test that alkali resistance is estimated, and obtain reduction rate.
Utilize Archimedes's method to obtain proportion.
Can try to achieve reduction rate (alkali resistance evaluation) by standard (JOGIS) 06-1999 in accordance with Japanese opticglass industry.
That is, the sample weighing grams identical with proportion of particle size 420 μ m～590 μ m put in platinum net (platinum カ go), flooded 48 hours under 95 ℃ in the NaOH of 2N aqueous solution 500ml, utilize the weight before and after flooding to try to achieve reduction rate.
[table 1]
In embodiment 1～3, either party, representing on the characteristics such as alkali-proof reduction rate, physical strength, thermal expansivity, can fine perspective glazing as liquid level meter.
On the other hand, in comparative example 3～7, because the alkali-proof reduction rate of expression is more than 1.30wt%, to substantially exceed 0.5wt%, therefore, can not solve alkali-proof problem.
In addition, in comparative example 2, because thermal expansivity surpasses 60 * 10
-7/ ℃, therefore being difficult to carry out tempering and processing (air-cooled intensive treatment), shock-resistance descends, therefore not preferred.
Below, illustrate the endurance test with the light transmission of glass of the embodiment 1～3 in above-described embodiment and comparative example and comparative example 1,2,5 liquid level meter that carry out, relevant.
In test, utilize the circular liquid level meter glass that uses in liquid level meter, do following 3 kinds of tests: be immersed in test (test 1), the test under the high-temperature and high-pressure conditions that autoclave pressure produces (test 2) of carrying out in alkaline aqueous solution and the actual load test (test 3) of carrying out for the liquid level meter of boiler.
(1) test 1
With the liquid level meter glass of sample in the NaOH of mass percent concentration 30% aqueous solution the lower dipping of normal temperature (10 ℃～20 ℃) 120 days, come with visual that the light transmission of glass changes before and after viewing test.
(2) test 2
The liquid level meter glass-impregnated of sample is dropped into autoclave pressure in distilled water, at pressure 15～20Mpa, placed under the condition that temperature is 330～360 ℃ 56 days, come with visual that the light transmission of glass changes before and after observation experiment.
(3) test 3
(i) the liquid level meter glass with sample is arranged on liquid level meter, the boiler that adds entry was worked 15 days under 330 ℃ of pressure 14MPa (ultra-high voltage), temperature, and liquid level meter glass is imposed effect.
After using on boiler, take off liquid level meter glass, come the light transmission of glass before and after observation experiment to change with visual observation.
(ii) the liquid level meter glass with sample is arranged on liquid level meter, the boiler that adds feedwater (the pH value is 10～11) was worked 10 months under 260 ℃ of pressure 5MPa (middle pressure), temperature, and liquid level meter glass is imposed effect.
After using on boiler, take off liquid level meter glass, come the light transmission of glass before and after observation experiment to change with visual observation.
Above test-results is presented in table 2.
[table 2]
The test-results of test 1～3 is described.
At first 1 result is tested in explanation.
Comparative example 1 is not corrosion almost, keeps initial light transmission.Consider that its reason is, due to the yttrium oxide (Y as alkali-proof effective constituent
2O
3) ratio (45%) brought up to vitrified reaching the standard grade, thereby improved alkali resistance.
In addition, comparative example 2 bleaches slightly, but keeps light transmission.
White opacity occurs in comparative example 5, can not have an X-rayed.And then, the upper layer corrosion spalling of glass, the white corrosion thing is layered in around it.
On the other hand, embodiment 2 compares with comparative example 1, and the surface bleaches slightly, is but that in other embodiment beyond comparative example 1 and comparative example, perviousness is the most excellent, has kept fully light transmission as the liquid level meter glass of liquid level meter.
The following describes the result of test 2.
Also can see same phenomenon in test 1,3, white film is peeled off and is reproduced the glass surface with light transmission, can have an X-rayed, but wherein the light transmission of embodiment 2 is the most excellent.
Comparative example 1, light transmission is good in the early stage, but there is no light transmission afterwards.
The phenomenon of the film separation recovery light transmission as embodiment 2 occurs, and can not have an X-rayed liquid level.
Comparative example 2 and comparative example 5, similarly to Example 2, the initial stage in test generates white film on the saturated surface of liquid level meter glass, and film separation is reproduced glass surface afterwards.
But, different from embodiment 2, repeatedly carry out after film separation and glass surface reproduce, glass surface becomes the frosted shape, does not have a light transmission, can not have an X-rayed liquid level.
The result of test 3 (i) then, is described.
But, under drying regime, can be easily with the white precipitate of liquid level meter glass surface from glass surface glass, reproduce glass surface.
Also can see roughly the same phenomenon in other embodiment 1,3, but the light transmission of embodiment 2 is the most excellent.
Comparative example 1, the 14th day front and back after on-test, the saturated surface generation white opacity of liquid level meter glass.
The white precipitate of glass surface is bonded to glass surface, can not peel off easily.
Comparative example 2 and comparative example 5 after on-test about the 7th day, at the saturated surface generation white opacity of liquid level meter glass in early stage, can not be had an X-rayed liquid level.
And be difficult to make white precipitate to be peeled off.
The following describes the result of test 3 (ii).
Compare corrosion with other comparative example few.
Therefore, embodiment 2 can be when boiler pressure be mesolow life-time service.
Also can see roughly the same phenomenon in other embodiment 1,3.
But embodiment 2 is the most excellent.
Comparative example 1 does not infiltrate the peeling on surface, and is faster than embodiment 2 white opacity progress.
Comparative example 2 and comparative example 5 corrosion make progress sooner.
And comparative example 1,2,5 all can not be kept light transmission.
Measurement result shown in above-mentioned table 2 is comprehensively judged, excellent based on the embodiments of the invention alkali resistance, after the effect of the feedwater that is subject to high temperature or steam, alkaline solution, the thin layer that white opacity occurs is peeled off naturally, reproduce glass surface, thereby can guarantee light transmission in life-time service.
Therefore, according to having the liquid level meter of liquid level meter glass as mentioned above, even under the situation that liquid level monitors or alkaline solution measures of boiler, also can subtract the reduced-maintenance frequency, significantly reduce the expense of safeguarding.
Claims (6)
1. the observation window of liquid level glass of a liquid level meter, wherein, described liquid level meter utilizes fluid column to represent liquid level, and watches described fluid column by observation window of liquid level and observe described liquid level, and the observation window of liquid level of described liquid level meter is characterised in that with glass, contains:
The SiO of 20～30wt%
2, 15～20wt% Al
2O
3, 25～30wt% Y
2O
3, 15～20wt% La
2O
3, 4～10wt% TiO
2, 5～10wt% ZrO
2
2. the observation window of liquid level glass of liquid level meter as claimed in claim 1 is characterized in that:
Flexural strength is 200N/mm
2Above.
3. the observation window of liquid level glass of liquid level meter as claimed in claim 1 is characterized in that:
Thermal expansivity is 40 * 10
-7～60 * 10
-7/ ℃.
4. the observation window of liquid level glass of liquid level meter as claimed in claim 1 is characterized in that:
Utilize the reduction rate of alkali-proof measuring method mensuration for below 0.5wt%, wherein said alkali-proof measuring method is the powder method in accordance with the chemical-resistant measuring method of the opticglass of understanding standard JOGIS06-1999 based on Japanese opticglass industry.
5. the observation window of liquid level glass of liquid level meter as claimed in claim 1 is characterized in that:
Peel off by the thin film layer that will contact with basic solution the white opacity that generates, and keep transparency.
6. a liquid level meter, is characterized in that, has the observation window of liquid level glass of liquid level meter as claimed in claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-279429 | 2009-12-09 | ||
| JP2009279429A JP4527193B1 (en) | 2009-12-09 | 2009-12-09 | Glass for liquid level observation window of level gauge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102092938A CN102092938A (en) | 2011-06-15 |
| CN102092938B true CN102092938B (en) | 2013-06-19 |
Family
ID=42767865
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010297808 Active CN102092938B (en) | 2009-12-09 | 2010-09-30 | Glass used for liquid level observation window of level gauge and level gauge |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4527193B1 (en) |
| CN (1) | CN102092938B (en) |
| HK (1) | HK1162454A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4527193B1 (en) * | 2009-12-09 | 2010-08-18 | 文化貿易工業株式会社 | Glass for liquid level observation window of level gauge |
| WO2017175552A1 (en) * | 2016-04-04 | 2017-10-12 | 株式会社 オハラ | Optical glass, preform material and optical element |
| TWI752046B (en) * | 2016-06-29 | 2022-01-11 | 日商小原股份有限公司 | Optical Glass, Preforms and Optical Components |
| CN106810067A (en) * | 2016-09-23 | 2017-06-09 | 南京神童特种玻璃技术有限公司 | A kind of alkaline-resisting high temperature resistant overpressure resistant zirconium yttrium lanthanum zinc-aluminium silica glass |
| CN110156327B (en) * | 2019-06-28 | 2022-05-17 | 鲁米星特种玻璃科技股份有限公司 | High-zirconium alkali-resistant glass and application thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4527193B1 (en) * | 2009-12-09 | 2010-08-18 | 文化貿易工業株式会社 | Glass for liquid level observation window of level gauge |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5934140B2 (en) * | 1980-03-12 | 1984-08-20 | 科学技術庁無機材質研究所長 | Alkali resistant aluminosilicate glass |
| JP3022071B2 (en) * | 1993-06-29 | 2000-03-15 | 三浦工業株式会社 | Boiler level gauge |
| JP4755994B2 (en) * | 2004-11-29 | 2011-08-24 | 日本板硝子株式会社 | Rubber reinforcing cord and rubber belt using the same |
| JPWO2006106781A1 (en) * | 2005-03-31 | 2008-09-11 | 日本板硝子株式会社 | Glass spacer for electron beam excited display including glass composition containing yttrium and electron beam excited display |
-
2009
- 2009-12-09 JP JP2009279429A patent/JP4527193B1/en active Active
-
2010
- 2010-09-30 CN CN 201010297808 patent/CN102092938B/en active Active
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4527193B1 (en) * | 2009-12-09 | 2010-08-18 | 文化貿易工業株式会社 | Glass for liquid level observation window of level gauge |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102092938A (en) | 2011-06-15 |
| JP4527193B1 (en) | 2010-08-18 |
| JP2011122881A (en) | 2011-06-23 |
| HK1162454A1 (en) | 2012-08-31 |
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