CN105338774B - A kind of watch crystal and the integrated SF of watchcase6Air density meter - Google Patents
A kind of watch crystal and the integrated SF of watchcase6Air density meter Download PDFInfo
- Publication number
- CN105338774B CN105338774B CN201510788321.7A CN201510788321A CN105338774B CN 105338774 B CN105338774 B CN 105338774B CN 201510788321 A CN201510788321 A CN 201510788321A CN 105338774 B CN105338774 B CN 105338774B
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- Prior art keywords
- shell
- watchcase
- integrated
- chassis
- density meter
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/06—Hermetically-sealed casings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/26—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences
- G01N9/266—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences for determining gas density
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/06—Hermetically-sealed casings
- H05K5/061—Hermetically-sealed casings sealed by a gasket held between a removable cover and a body, e.g. O-ring, packing
Abstract
The invention discloses a kind of watch crystals and the integrated SF of watchcase6Air density meter, density meter includes shell and is set to the intracorporal dial of shell, pedestal, it sits up straight, chassis, Baden pipe, machine core and pointer, wherein, shell is using watch crystal and the integrated design method of watchcase, shell includes bottom surface and the side perpendicular with bottom surface, the side and chassis of shell are linked together by fixing piece, to which shell is linked together with chassis, shell and chassis are provided with sealing element at chassis beside the position of fixing piece, pedestal is fixed on chassis by sealing element and fixing piece sealing, one end welding of Baden pipe is on the base, the other end of Baden pipe, which is welded on, sits up straight, pointer, dial and machine core are sequentially fixed on pedestal, pedestal is connected by joint assembly with external other equipment.Compared with prior art, due to watch crystal and the integrated SF of watchcase of the invention6Air density meter be it is integrated, sealing effect can be improved, be greatly simplified manufacture craft, improve efficiency, reduce cost, can apply on sulfur hexafluoride electrical equipment well.
Description
Technical field
The present invention relates to the device for detecting density of high voltage electric equipment more particularly to a kind of watch crystal and watchcase are integrated
SF6Air density meter.
Background technique
SF6Electric product has been widely used the fast development that power industry is promoted in power department, industrial and mining enterprises.It protects
The reliable and secure operation of card sulfur hexafluoride electric product has become one of vital task of power department.Sulfur hexafluoride electric product
Arc-extinguishing medium and dielectric be sulfur hexafluoride gas, therefore gas leakage cannot occur, in case of gas leakage, cannot guarantee six
The reliable and secure operation of sulfur fluoride electric product, so the sulfur hexafluoride pressure value of monitoring sulfur hexafluoride electric product or density value are
Very necessary.
In industrial circle and in the daily work and in other fields, miscellaneous shell filling liquid is all largely used
(such as vibrationproof oil) or the density meter of inflation (such as sulfur hexafluoride gas, nitrogen), promotes the progress of the mankind and the development of civilization.Such as
The widely applied shock type oil dumped pressure gauge of the departments such as electric power, chemical industry, metallurgy, water supply, as in electric system it is widely applied absolutely
To pressure-type sulfur hexafluoride density table, oil-filled type electro connecting pressure gauge and oil-filled type sulfur hexafluoride gas density relay isodensity
Table.These density meters all play huge effect in respective post, promote the fast development of human society.How this is guaranteed
The intracorporal gas of shell or liquid of a little density meters will not leak, and guarantee the reliable and secure operation of its system, it has also become people's
One of vital task and work.Because the performance quality of these density meters directly influences the reliable and secure fortune of its related system
Row, installs these density meters on site, often occurs the intracorporal gas of its shell after one period or liquid occurs leakage and asks
Topic.From the point of view of practical operation situation, these density meter oil leaks or gas leak phenomenon are very universal, seriously affect system safety and can
It leans on, while such as to replace these density meters and spend many funds again.Because junction block and shell on these density meters is close
For envelope due to being to take to seal in cambered surface, sealing effect is bad, and oil leak or leakage problem can usually occur；Because of these density
Observation window on table is also to seal in small cambered surface, and sealing effect is bad, and oil leak or leakage problem can usually occur.
It is used to monitor the pointer type density relay that sulfur hexafluoride density generallys use a kind of machinery in the prior art, has
When sulfur hexafluoride electric product occur gas leakage when can alarm and blocking function and scene display density value performance.It uses at present
Density monitor contact mainly use electric contact type and microswitch type, electric contact type density monitor will generally fill antivibration
Silicone oil, and the density monitor of microswitch type vibrates special occasions at some and is also required to fill vibrationproof oil, and current generation
These oil-filled or inflation density monitors are since the sealing of its junction block, observation window and shell taken in cambered surface in boundary
It is sealed in (or small cambered surface), sealing effect is bad, and oil leak usually can occur at shell and watch crystal (observation window) or gas leakage is asked
Topic, brings error, brings loss to user.It also will affect normal use when serious.And these inflations or oil-filled currently on the market
Density monitor include watchcase 301, cover 201, sealing element 401 and observation window 101 (as shown in fig. 1), 301 upper end of watchcase
It is provided with sealing element 601, watchcase 301 has fore shaft at fore shaft A.Since the open end of current watchcase 301 is with respect to observation window 101
Sealing surface is cambered surface or facet, and sealing element 401 is placed on facet or is easy displacement in cambered surface, and does not have the work of sealing
With, therefore oil leak or leakage problem can usually occur, error is brought, more brings loss to user, also will affect when serious normal
It uses.And most importantly this seal approach, the seal compression of sealing element cannot control well, if sealing
Decrement is big, on the one hand, may cause rubber seal and compression set occurs during installation；On the other hand, so that rubber
Glue sealing element generates biggish equivalent Von Mises stress, to cause the failure of rubber seal material, lowering it significantly makes
With the service life, and cause gas leakage or oil leak；If instead decrement is too small, just it is easy to that leakage can be generated.So this density
Shell gas leakage or Leakage can usually occur for table or density monitor, bring error, more bring loss to user, when serious also
It will affect normal use.And the density meter of this structure, manufacturing cost is higher, needs multiple parts, and these part manufacturings
It is at high cost.And since glass is easier broken, and bad installation, so all being consolidated in the prior art using many parts
Fixed, not only sealing effect is not very well, many materials also to be wasted, to increase the cost of production for this.Present market warp
Ji, needs to simplify, improve efficiency to the manufacture craft of product, reduces cost, improves competitiveness.
It would therefore be highly desirable to develop a kind of good seal performance, simplify manufacture craft, improve efficiency, reduce the lithium of cost
Sulphur air density meter or density monitor.
Summary of the invention
In view of the above drawbacks of the prior art, technical problem to be solved by the invention is to provide a kind of watch crystal and tables
Shell integrated SF6Air density meter, not only good seal performance, manufacture craft also compare simplification, also improve working efficiency, drop
Low cost, so as to meet actual demand.
To achieve the above object, the present invention provides a kind of watch crystal and the integrated SF of watchcase6Air density meter, the table glass
Glass and the integrated SF of watchcase6Air density meter includes shell and is set to the intracorporal dial of the shell, pedestal, sits up straight, bottom
Disk, Baden pipe, machine core and pointer, wherein the shell is using watch crystal and the integrated design method of watchcase, the shell packet
Bottom surface and the side perpendicular with bottom surface are included, the side of the shell is linked together with the chassis by fixing piece,
To which the shell is linked together with the chassis, the shell and the chassis are beside the position of the fixing piece
Sealing element is provided at the chassis, the pedestal is fixed on the bottom by the sealing element and fixing piece sealing
On disk, one end of the Baden pipe is welded on the pedestal, the other end of the Baden pipe be welded on it is described sit up straight, it is described
Pointer, the dial and the machine core are sequentially fixed on the pedestal, and the pedestal passes through its of joint assembly and outside
He is connected equipment.
Further, the watch crystal and the integrated SF of watchcase6Air density meter further includes temperature compensating element, described
One end of temperature compensating element is connected with described sit up straight, and the other end of the temperature compensating element is connected with the machine core.
Further, the temperature compensating element is bimetallic material.
Further, the temperature compensating element is the internal closed structure filled with the gas for temperature-compensating.
Further, the cross section of the Baden pipe is in rectangle or ellipse, and the width of the Baden pipe is 14~
40mm。
Further, the watch crystal and the integrated SF of watchcase6Air density meter further includes sealing gland screw, the sealing gland
Screw is fixed on the chassis or the shell by the sealing element.
Further, the bottom surface of shell is transparent.
Further, the watch crystal and the integrated SF of watchcase6Air density meter further includes the anti-transport protection of Baden pipe
The outside of the Baden pipe is arranged in part, the anti-transport guard member of Baden pipe.
Further, the watch crystal and the integrated SF of watchcase6The also described machine core of air density meter is with damping
Structure.
Further, the watch crystal and the integrated SF of watchcase6Air density meter further includes warning block signal contact,
The warning block signal contact is arranged on the pedestal by connecting component, and is mounted on the dial and the machine core
Between.
Compared with prior art, due to watch crystal and the integrated SF of watchcase of the invention6Air density meter is integration
, sealing effect can be improved, be greatly simplified manufacture craft, improve efficiency, reduce cost, can apply well in hexafluoro
Change on sulphur electrical equipment.
Using above-mentioned technical solution, so that a kind of watch crystal of the present invention and the integrated SF of watchcase6Air density meter energy
Enough it is suitable for the pressure or density of the sulfur hexafluoride gas in various application in substations, control and monitoring sealing container, applies simultaneously
On sulfur hexafluoride electrical equipment, for the gas leakage situation occurred in sulfur hexafluoride electrical equipment, it can give and show immediately,
To ensure that electric power safety plays a role.Watch crystal and watchcase of the invention uses integrated technical solution, using transparent material
Production, eliminates cover, by the way that the sealing surface of lesser arc-shaped is improved to big planar sealing contact surface, while also adopting
It with sealing ring is located between integrated watchcase and watch crystal and chassis by groove, the seal compression of sealing element can be made to measure
To effective control, so that its seal compression be made to reach scheduled target, greatly extends the service life of sealing element, improve
Sealing performance.More importantly this density meter (or relay) can fill vibrationproof oil, production can also be greatly improved with inflatable body
Quality expands products application range.There are also being exactly to be enormously simplified to the manufacture craft of product, efficiency is improved, is reduced
Cost greatly increases competitiveness.
It is described further below with reference to technical effect of the attached drawing to design of the invention, specific structure and generation, with
It is fully understood from the purpose of the present invention, feature and effect.
Detailed description of the invention
Fig. 1 is the pointer sulfur hexafluoride gas gauge of the prior art or the structural schematic diagram of density meter；
Fig. 2 is watch crystal and the integrated SF of watchcase of the invention6The structural schematic diagram of the embodiment one of air density meter；
Fig. 3 is watch crystal and the integrated SF of watchcase of the invention6The structural schematic diagram of the embodiment two of air density meter.
In attached drawing, 1 indicates Baden pipe, and 2 indicate shell, and 3 indicate chassis, and 4 indicate sealing element, and 5 indicate fixing piece, and 6 indicate
Sealing element, 7 indicate sealing gland screw, and 8 indicate sealing element, and 9 indicate pedestal, and 10 indicate fixing piece, and 11 indicate joint assembly, and 12 indicate
Pointer, 13 indicate machine core, and 14 indicate dial, and 15 indicate warning block signal contact, and 16 indicate junction block, and 17 indicate sealing
Part, 18 indicate connecting component, and 19 indicate cable, and 20 indicate to sit up straight, and 21 indicate bottom surface, and 22 indicate side, and 301 indicate watchcase,
201 indicate cover, and 401 indicate sealing element, and 101 indicate observation window, and 601 indicate that sealing element, A indicate fore shaft.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
As shown in Figure 1, for the pointer sulfur hexafluoride gas gauge of the prior art or the structural schematic diagram of density meter, such as
As shown in the figure, these inflations or oil-filled density monitor include watchcase 301, cover 201,401 and of sealing element currently on the market
Observation window 101,301 upper end of watchcase are provided with sealing element 601, and watchcase 301 has fore shaft at fore shaft A.Due to current watchcase 301
Open end is cambered surface or facet with respect to the sealing surface of observation window 101, and sealing element 401 is placed on facet or is easy in cambered surface
Displacement, and the effect of sealing is not had, therefore oil leak or leakage problem can usually occur, error is brought, more brings damage to user
It loses, also will affect normal use when serious.
Fig. 2 is watch crystal and the integrated SF of watchcase of the invention6The structural schematic diagram of the embodiment one of air density meter,
For a preferred embodiment of the invention, as shown in the figure, the present invention provides a kind of watch crystal and watchcase are integrated
SF6Air density meter, this watch crystal and the integrated SF of watchcase6Air density meter includes shell 2, dial 14, pedestal 9, bottom
Disk 3, Baden pipe 1, machine core 13, pointer 12 and sit up straight 20 (referring to Fig. 3), wherein dial 14, pedestal 9, chassis 3, Baden pipe
1, machine core 13, pointer 12 and 20 sat up straight be set in shell 2, shell 2 using watch crystal and the integrated design method of watchcase,
And shell 2 is made for transparent material, such as polycarbonate transparent material, wherein at least bottom surface is transparent, shape one
As be it is round, i.e., side is typically round.Shell 2 includes bottom surface 21 and the side 22 perpendicular with bottom surface 21, the side of shell 2
Face 22 and chassis 3 are linked together by fixing piece 5, so as to so that shell 2 is linked together with chassis 3, shell 2
Sealing element 4 is provided at the chassis 3 beside the position of fixing piece 5 with chassis 3, shell 2 is by sealing element 4 and admittedly
Determine the sealing of part 5 to be fixed on chassis 3.Pedestal 9 is fixed on chassis 3 by sealing element 8 and the sealing of fixing piece 10.Baden pipe 1
One end is welded on pedestal 9, and the other end of Baden pipe 1, which is welded on, sits up straight on 20 (not marking in Fig. 2), pointer 12, dial
14 and machine core 13 be sequentially fixed on pedestal 9, pedestal 9 is connected by joint assembly 11 with external other equipment.Pedestal 9 is logical
It crosses sealing element 8 and the sealing of fixing piece 10 is fixed on chassis 3, so that shell 2, chassis 3 and pedestal 9 is formed a seal cavity, reach
To the function of absolute pressure gauge, the invention also includes a sealing gland screw 7, sealing gland screw 7 is fixed on chassis 3 by sealing element 6
Or on shell 2, it can not only play the role of better seal in this way, the air pressure that also guaranteed 2 inside of shell is sealed is
Atmospheric pressure (usually standard atmospheric pressure).Because interior when shell 2 and the sealing of chassis 3 are fixed together without sealing gland screw 7
The air pressure in portion will be squeezed, and be not just the local standard atmospheric pressure of envelope, meter will be made inaccurate.And there is sealing gland screw
The phenomenon would not occur for 7 effect, because after shell 2 and the sealing of chassis 3 are fixed together, then sealing gland screw is sealed, because
Sealing gland screw is small, and shared volume is very little, and the air pressure of the inside would not change.
Watch crystal and the integrated SF of watchcase of the invention6Air density meter further includes that temperature compensating element (does not show in figure
Out), one end of this temperature compensating element is connected with sitting up straight 20, and the other end of temperature compensating element is connected with machine core 13,
Temperature compensating element is metal material, and temperature compensating element is the internal closed structure filled with the gas for temperature-compensating,
Temperature compensating element is bimetallic material (or closed filled with the gas+connecting rod for playing temperature-compensating), and Baden pipe 1 is C-shaped, it
Cross section be in rectangle or ellipse, its one end is welded on pedestal 9 and in communication, and the other end, which is welded on, sits up straight on 20.
In order to improve resistance to shock, the width of Baden pipe 1 is in addition increased into 14~40mm, can also be improved the vibration resistance of Baden pipe 1
Energy.In addition, density meter can also have the anti-transport guard member (not shown) of Baden pipe, the anti-transport guard member setting of Baden pipe
In the outside of Baden pipe 1, its resistance to shock is further increased, the machine core 13 of pointer density meter of the invention can also have
Damping mechanism can be further improved its resistance to shock.
Watch crystal and the integrated SF of watchcase of the invention6The action principle of air density meter is based on elastic element Baden
Pipe 1 is modified using pressure and temperature of the temperature compensating element to variation, reacts the variation of sulfur hexafluoride gas density, i.e.,
Under the pressure effect of measured medium sulfur hexafluoride gas, because of the effect of temperature compensating element, the variation of density value,
Pressure value also changes accordingly, and the end of Baden pipe 1 is forced to generate corresponding flexible deformation --- displacement, by means of temperature-compensating
Element passes to machine core 13, and machine core 13 passes to pointer 12 again, by the sulfur hexafluoride gas density value that will be tested in dial 14
On indicate.
Fig. 3 is watch crystal and the integrated SF of watchcase of the invention6The structural schematic diagram of air density meter embodiment two, bar
Step on that pipe 1 is C-shaped, its cross section is in rectangle or ellipse, its one end is welded on pedestal 9 and in communication, other end weldering
It connects and is sitting up straight on 20.Compared with the first embodiment, warning block signal contact 15, warning block signal contact 15 are increased
It is arranged on pedestal 9 by connecting component 18, and is mounted between dial 14 and machine core 13.Junction block 16 passes through sealing element 17
Sealing is fixed on chassis 3, and warning block signal contact 15 is exported by junction block 16, and then is output to by cable 19
Equipment or system.If gas leakage, density value decline (reaches alarm or locking value) to a certain extent, alarm or locking contact
It connects, issues corresponding signal (alarm or locking), reach the SF in the equipment such as monitoring and the electrical beginning of control6Gas density,
Make electrical equipment trouble free service.
Watch crystal and watchcase of the invention uses integrated technological innovation scheme, is made, is eliminated of transparent material
Cover by the way that the sealing surface of lesser arc-shaped is improved to big planar sealing contact surface, while being also using sealing ring
It is located between integrated watchcase and watch crystal and chassis by groove, the seal compression of sealing element can be made effectively to be controlled
System, makes its seal compression reach scheduled target, greatly extends the service life of sealing element, improves sealing performance.More
It is important that this density meter (or relay) can fill vibrationproof oil, product quality can also be greatly improved with inflatable body, expand and produce
Product application range.There are also being exactly to be enormously simplified to the manufacture craft of product, efficiency is improved, is reduced costs, is greatly mentioned
High competitiveness.Also it is exactly, since watch crystal and watchcase use integrated technological innovation scheme, without necking, so
The outer diameter of this density meter (or relay) be can be made smaller, and can be suitble in more applications.
Those of ordinary skill in the art it should be appreciated that more than embodiment be intended merely to illustrate the present invention
, and be not used as limitation of the invention, as long as in spirit of the invention, to embodiment described above
Variation, modification will all be fallen within the scope of claims of the present invention.The density meter can also include that there is teletransmission to communicate function
Energy；The density meter can also further extend to density switch.It should be appreciated that the ordinary skill of this field is not necessarily to creative labor
It moves according to the present invention to conceive and makes many modifications and variations.Therefore, all technician in the art Yi Benfa
Bright design passes through the available technical solution of logical analysis, reasoning, or a limited experiment on the basis of existing technology,
It all should be within the scope of protection determined by the claims.
Claims (10)
1. a kind of watch crystal and the integrated SF of watchcase6Air density meter, which is characterized in that including shell and be set to the shell
Intracorporal dial pedestal, is sat up straight, chassis, Baden pipe, machine core and pointer, wherein the shell is using watch crystal and watchcase one
The design method of body, the shell include bottom surface and the side perpendicular with the bottom surface, the side of the shell
Inner wall is linked together with the chassis by fixing piece, so that the shell is linked together with the chassis, it is described
Shell and the chassis are provided with sealing element beside the position of the fixing piece at the chassis, and the pedestal passes through the
Two sealing elements and the sealing of the second fixing piece are fixed on the chassis, and one end of the Baden pipe is welded on the pedestal, institute
State Baden pipe the other end be welded on it is described sit up straight, the pointer, the dial and the machine core are sequentially fixed at described
On pedestal, the pedestal is connected by joint assembly with external other equipment；
The sealing element is located between the side and the chassis of the shell.
2. watch crystal as described in claim 1 and the integrated SF of watchcase6Air density meter, which is characterized in that further include temperature
Compensating element, one end of the temperature compensating element are connected with described sit up straight, the other end of the temperature compensating element and institute
Machine core is stated to be connected.
3. watch crystal as claimed in claim 2 and the integrated SF of watchcase6Air density meter, which is characterized in that the temperature is mended
Repaying element is bimetallic material.
4. watch crystal as claimed in claim 2 and the integrated SF of watchcase6Air density meter, which is characterized in that the temperature is mended
Element is repaid as the internal closed structure filled with the gas for temperature-compensating.
5. watch crystal as claimed in claim 4 and the integrated SF of watchcase6Air density meter, it is characterised in that the Baden pipe
Cross section be in rectangle or ellipse, the width of the Baden pipe is 14~40mm.
6. watch crystal as claimed in claim 5 and the integrated SF of watchcase6Air density meter, which is characterized in that further include sealing gland
Screw, the sealing gland screw are fixed on the chassis or the shell by third sealing element.
7. watch crystal as described in claim 1 and the integrated SF of watchcase6Air density meter, which is characterized in that the shell
Bottom surface is transparent.
8. watch crystal and the integrated SF of watchcase as claimed in claims 6 or 76Air density meter, which is characterized in that further include
The outside of the Baden pipe is arranged in the anti-transport guard member of Baden pipe, the anti-transport guard member of Baden pipe.
9. watch crystal as claimed in claim 8 and the integrated SF of watchcase6Air density meter, which is characterized in that the machine core is
Structure with damping.
10. watch crystal as claimed in claim 9 and the integrated SF of watchcase6Air density meter, which is characterized in that further include report
Alert block signal contact, the warning block signal contact are arranged on the pedestal by connecting component, and are mounted on described
Between dial and the machine core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510788321.7A CN105338774B (en) | 2015-11-17 | 2015-11-17 | A kind of watch crystal and the integrated SF of watchcase6Air density meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510788321.7A CN105338774B (en) | 2015-11-17 | 2015-11-17 | A kind of watch crystal and the integrated SF of watchcase6Air density meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105338774A CN105338774A (en) | 2016-02-17 |
| CN105338774B true CN105338774B (en) | 2019-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510788321.7A Active CN105338774B (en) | 2015-11-17 | 2015-11-17 | A kind of watch crystal and the integrated SF of watchcase6Air density meter |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108037042B (en) * | 2018-01-12 | 2024-04-09 | 上海乐研电气有限公司 | Gas density meter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4214474A (en) * | 1977-10-04 | 1980-07-29 | Bbc Brown, Boveri & Co., Ltd. | Density monitoring apparatus |
| CN2856956Y (en) * | 2005-12-15 | 2007-01-10 | 黄伯春 | Manometer |
| CN202195908U (en) * | 2011-07-21 | 2012-04-18 | 上海乐研电气科技有限公司 | Vibration-resisting pointer type sulfur-hexafluoride gas pressure gauge |
| CN205179580U (en) * | 2015-11-17 | 2016-04-20 | 上海乐研电气科技有限公司 | Table glass and SF6 gas density of watchcase integration show |
-
2015
- 2015-11-17 CN CN201510788321.7A patent/CN105338774B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4214474A (en) * | 1977-10-04 | 1980-07-29 | Bbc Brown, Boveri & Co., Ltd. | Density monitoring apparatus |
| CN2856956Y (en) * | 2005-12-15 | 2007-01-10 | 黄伯春 | Manometer |
| CN202195908U (en) * | 2011-07-21 | 2012-04-18 | 上海乐研电气科技有限公司 | Vibration-resisting pointer type sulfur-hexafluoride gas pressure gauge |
| CN205179580U (en) * | 2015-11-17 | 2016-04-20 | 上海乐研电气科技有限公司 | Table glass and SF6 gas density of watchcase integration show |
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| Publication number | Publication date |
|---|---|
| CN105338774A (en) | 2016-02-17 |
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