CN106352132A - T-junction used for detecting pointer type SF6 gas density controller - Google Patents
T-junction used for detecting pointer type SF6 gas density controller Download PDFInfo
- Publication number
- CN106352132A CN106352132A CN201610821813.6A CN201610821813A CN106352132A CN 106352132 A CN106352132 A CN 106352132A CN 201610821813 A CN201610821813 A CN 201610821813A CN 106352132 A CN106352132 A CN 106352132A
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- China
- Prior art keywords
- valve
- self
- styled
- gas density
- density controller
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K24/00—Devices, e.g. valves, for venting or aerating enclosures
- F16K24/06—Devices, e.g. valves, for venting or aerating enclosures for aerating only
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
- F16K1/38—Valve members of conical shape
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0254—Construction of housing; Use of materials therefor of lift valves with conical shaped valve members
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/26—Details
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Valve Housings (AREA)
Abstract
The invention relates to a t-junction used for detecting a pointer type SF6 gas density controller, and belongs to the technical field of electric power electrical equipment detection joints. The t-junction is composed of a multi-pass joint base, a self-styled valve component, an open valve mechanism and the like, wherein the upper part of the multi-pass joint base is connected to an electrical equipment main body through a connecting head, the lower part of the multi-pass joint base is connected to the gas density controller through a controller base; air inlet holes are formed in the top of a mounting hole of the self-styled component inside the multi-pass joint base, air outlet holes are formed in the upper part of a mounting hole of the open valve mechanism; the self-styled valve component is arranged inside the mounting hole of the self-styled valve component, the open valve mechanism is arranged inside the mounting hole of the open valve mechanism, the self-styled valve component is composed of a valve rod, a valve core, a spring, a blocking element and a sealing element; the open valve mechanism is composed of a top rod, a nut, a blocking ring and a sealing ring; the open valve mechanism is movably connected to the valve core of the self-styled valve component through the top rod, a spring is arranged on the valve rod of the self-styled valve component. Detection can be conducted without dismantling; in addition, the t-junction used for detecting the pointer type SF6 gas density controller has simple structure, convenient operation, good sealing effect, and is safe and reliable to use.
Description
Technical field
The present invention relates to one kind is used for verifying pointer sf6The three way cock of gas density controller, belongs to electric power electric and sets
Standby detection tabs technical field.
Background technology
Sulfur hexafluoride (sf6) electrical equipment promotes the fast development of power industry in the extensive application of power department.sf6
Gas density controller is used for detecting sf6Sf in electrical equipment6The situation of change of gas density, because it directly concerns sf6Electrically set
Standby reliable and secure operation, specifies for this government test code: each sf6Electrical equipment should be periodically to sf using unit6Gas density
Controller is verified.Some sf at present6The multiple-pass joint seat of the gas density controller of electrical equipment adopts non-return valve form
Connect, the density controller of verification or replacing this form connection can only unload its multiple-pass joint seat and disengage it from sf6Electrically set
Standby start again to verify or change density controller, troublesome poeration.Additionally, traditional multiple-pass joint seat can only verify and with source of the gas direction be in
The density controller that plumbness is installed, but have density controller much to be verified to be to put down with source of the gas direction in real work
Row is installed, and traditional multiple-pass joint seat is helpless to this, substantially reduces work efficiency, it is difficult to ensure that sf6Electrical equipment can
By safe operation.
Content of the invention
It is an object of the invention to, for above-mentioned the deficiencies in the prior art, providing one kind need not dismantle can detect, structure
Simply, easy to operate, good sealing effect, safe and reliable for verifying pointer sf6The threeway of gas density controller
Joint.
The present invention is to realize above-mentioned purpose by the following technical solutions:
This is used for verifying pointer sf6The three way cock of gas density controller is by multiple-pass joint seat, self-styled valve components, valve opening machine
Structure, union joint, controller seat constitute it is characterised in that: the top of multiple-pass joint seat is passed through union joint and electrical equipment body and is pacified
Load connects, and the bottom of multiple-pass joint seat is passed through controller seat and is connected with gas density controller installation；Right side in multiple-pass joint seat
Making has self-styled valve components installing hole, and in multiple-pass joint seat, left side makes valve-opening mechanism installing hole, self-styled valve components installing hole
Top is opened and is formed with air inlet a, and valve-opening mechanism installing hole bottom is opened and is formed with venthole b；It is provided with self-styled valve components installing hole certainly
Envelope valve components, valve-opening mechanism is installed in the hole and is provided with valve-opening mechanism；Self-styled valve components are by valve rod, valve element, spring, blocking piece, sealing
Part forms；Valve-opening mechanism is made up of push rod, nut, back-up ring, sealing ring a, sealing ring b；Valve-opening mechanism passes through push rod and Self-sealing valve
The valve element activity docking of element, the valve rod of self-styled valve components is provided with spring.
Described self-styled valve components are connected with multiple-pass joint seat by sealing member, and self-styled valve components are welded by blocking piece and are fixed on
In multiple-pass joint seat.
Described valve-opening mechanism is arranged in multiple-pass joint seat by nut, passes through sealing between valve-opening mechanism and multiple-pass joint seat
Circle a and sealing ring b is tightly connected.
On described push rod, symmetrical making has back-up ring, and back-up ring plays position-limiting action to nut.
Described union joint has two kinds, and one kind is with clamp nut formula joint, and another kind of is flanged fitting, two kinds of connections
All each make fluted on head, in groove, be placed with sealing member, union joint is passed through sealing member and installed even with electrical equipment body
Connect.
The present invention having the beneficial effects that compared with prior art:
This is used for verifying pointer sf6The three way cock of gas density controller adopts self-styled valve components, valve-opening mechanism, connection
Head, need not dismantle density controller can verify to vertical, horizontal direction installation density controller, and good airproof performance makes
With safe and reliable, meet customer need, easy to operate, mitigate work load, greatly improve work efficiency.Improve and solve now
Multiple-pass joint seat can only be unloaded when having technology verification, changing makes density controller depart from sf6Verified again after electrical equipment or
Change, troublesome poeration, increase labor intensity, and cannot level check install density controller it is difficult to ensure sf6Electrical equipment
The problem of reliable and secure operation.
Brief description
Fig. 1 is used for verifying pointer sf for one kind6The overall structure diagram of the three way cock of gas density controller；
Fig. 2 is used for verifying pointer sf for one kind6The structural representation of the test status of the three way cock of gas density controller；
Fig. 3 is used for verifying pointer sf for one kind6The section view knot of second embodiment of the three way cock of gas density controller
Structure schematic diagram；
Fig. 4 is used for verifying pointer sf for one kind6The section view knot of the 3rd embodiment of the three way cock of gas density controller
Structure schematic diagram.
In figure: 1, multiple-pass joint seat, 2, self-styled valve components, 3, valve-opening mechanism, 4, union joint, 5, clamp nut, 6, sealing
Part, 7, electric equipment body, 8, controller seat, 9, sealing member, 10, gas density controller, 201, valve rod, 202, valve element,
203rd, spring, 204, blocking piece, 205, sealing member, 301, push rod, 302, nut, 303, back-up ring, 304, sealing ring a, 305, sealing
Circle b.
Specific embodiment
Below in conjunction with the accompanying drawings this is used for verifying pointer sf6The embodiment of the three way cock of gas density controller is made
Further describe:
This is used for verifying pointer sf6The three way cock of gas density controller is by multiple-pass joint seat 1, self-styled valve components 2, valve opening
Mechanism 3, union joint 4, controller seat 8 are constituted, and the top of multiple-pass joint seat 1 is passed through union joint 4 and installed even with electrical equipment body 7
Connect, the bottom of multiple-pass joint seat 1 is passed through controller seat 8 and is connected with gas density controller 10 installation；Right side in multiple-pass joint seat 1
Making has self-styled valve components installing hole, and in multiple-pass joint seat 1, left side makes valve-opening mechanism installing hole, self-styled valve components installing hole
Top is opened and is formed with air inlet a, and valve-opening mechanism installing hole bottom is opened and is formed with venthole b；It is provided with self-styled valve components installing hole certainly
Envelope valve components 2, valve-opening mechanism is installed in the hole and is provided with valve-opening mechanism 3；Self-styled valve components 2 are by valve rod 201, valve element 202, spring
203rd, blocking piece 204, sealing member 205 form；Valve-opening mechanism 3 is by push rod 301, nut 302, back-up ring 303, sealing ring a304, sealing
Circle b305 composition；Valve-opening mechanism 3 is passed through push rod 301 and is docked with valve element 202 activity of self-styled valve components 2, the valve of self-styled valve components 2
Spring 203 is provided with bar 201.
Described self-styled valve components 2 are connected with multiple-pass joint seat 1 by sealing member 205, and self-styled valve components 2 pass through blocking piece 204
It is welded and be fixed in multiple-pass joint seat 1.
Described valve-opening mechanism 3 is arranged in multiple-pass joint seat 1 by nut 302, between valve-opening mechanism 3 and multiple-pass joint seat 1
It is tightly connected by sealing ring a304 and sealing ring b305.
On described push rod 301, symmetrical making has back-up ring 303, and back-up ring 303 is to 302 position-limiting actions of nut.
Described union joint 4 has two kinds, and one kind is with clamp nut formula joint, and another kind of is flanged fitting, two kinds of companies
All each make fluted on joint 4, be placed with sealing member in groove, union joint 4 passes through sealing member 6 and electrical equipment body 7
Install and connect.(referring to Fig. 1～4)
Embodiment 1: this is used for verifying pointer sf62 points of three kinds of feelings of the self-styled valve components of the three way cock of gas density controller
Condition: when self-styled valve components 2 are provided with valve-opening mechanism 3, the push rod 301 of valve-opening mechanism 3 backs down the valve element of self-styled valve components 2 to one
202, now, away from multiple-pass joint seat 1, so, the gas circuit of air inlet a and venthole b is unobstructed for the sealing member 205 on valve rod 201,
I.e. electrical equipment body 7 is connected with air inlet a；
Its two when self-styled valve components 2 unload valve-opening mechanism 3, in the presence of spring 203, the now valve rod of self-styled valve components 2
Sealing member 205 on 201 is adjacent to multiple-pass joint seat 1, is in sealing state, and so, self-styled valve components 2 make air inlet a and give vent to anger
The gas channels closing of hole b, has also blocked the gas of air inlet a, it is to avoid gas leaks outside simultaneously.
Three when self-styled valve components 2 are in normal operating conditions, the push rod 301 of valve-opening mechanism 3 backs down self-styled valve components 2 for it
Valve element 202, now the sealing member 205 of self-styled valve components 2 is away from multiple-pass joint seat 1, i.e. sealing member 205 and multiple-pass joint seat 1
Do not contact, so, the gas circuit of switch air inlet is communicated with gas density controller 10.Wherein: self-styled valve components 2 are from valve opening machine
The reverse loading multiple-pass joint seat 1 of structure 3, self-styled valve components 2, after installing, are welded close by blocking piece 204 and multiple-pass joint seat 1
Sealing is fixed.
There are two seals between the push rod 301 of valve-opening mechanism 3 and multiple-pass joint seat 1, that is, pass through sealing ring a304 and sealing ring
B305 constitutes two seals；By nut 302, push rod 301 is fixed in multiple-pass joint seat 1, ensures to reliably seal with this, make
Generally in normal operation state (referring to Fig. 1)；Also it is arranged with back-up ring 303 in the outside of push rod 301, back-up ring 303 is used
Position-limiting action in nut 302.
When verification or replacing gas density controller 10, as long as first backing out nut 302 with spanner to unload valve-opening mechanism 3, (ginseng
See Fig. 2), now, in the presence of spring 203, the sealing member 205 on the valve rod 201 of self-styled valve components 2 is just adjacent to multiple-pass joint
Seat 1 is in sealing state, and so, self-styled valve components 2 can make the gas circuit of air inlet a and venthole b close, and also seal up simultaneously
The gas of air inlet a so as to gas will not leak outside, now, the gas circuit of all air inlets of electrical equipment body 7 and gas density
It is not connected that controller 10 is in cut-off state, so that gas density controller 10 is separated with electrical equipment body 7 in gas circuit, this
Sample, if verify in the position attaching of former valve-opening mechanism 3 used cross joint, this transit joint and gas density controller 10 exist
Communicate in gas circuit, (referring to Fig. 2), gas density controller 10 can be verified by this transit joint, in the same manner, this state is also
Can carry out changing the operation of gas density controller 10.
It is used for verifying pointer sf to further improve this6The sealing of the three way cock of gas density controller
Can, controller seat 8 makes fluted, and device has sealing member 9 on groove, to strengthen controller seat 8 and sf6Gas is close
The sealing of degree 10 contact planes of controller is it is ensured that the present invention is airtight, reliability service.
Make fluted on the boss of union joint 4, and sealing member 6 is arranged on groove, make in union joint 4 outside simultaneously
There is at least one seal groove to increase flat seal, so, by guaranteeing the good airproof performance of whole device using dual-seal, protect
Card reliability service.
Verification or change after gas density controller 10 finishes, takes off the transit joint of verification, valve-opening mechanism 3 is installed
To in multiple-pass joint seat 1, (referring to Fig. 1), then with spanner, nut 302 being tightened guarantees to seal.So, whole verification or
It is no need for during changing density controller 10 dismantling sf6Gas density controller 10 or multiple-pass joint seat 1, facilitate electric power
The verification of maintainer, replacement operation, so that it is guaranteed that sf6Electrical equipment normal safe operates.
In order to ensure to seal, reduce sealing surface, union joint 4 described in the present embodiment, controller seat 8 and multiple-pass joint as far as possible
Fixed with welding manner between seat 1 and seal, make the sealing property of whole device relatively reliable.
Embodiment 2:(is referring to Fig. 3), union joint 4 is a flange shape joint, no clamp nut 5 on this flange shape joint, and
This flange shape joint is provided with groove, and is provided with sealing member 6 on groove.During installation, this flange shape joint is directly sealed
It is fixed on electrical equipment body 7.In addition, this flange shape joint can be joined together with multiple-pass joint seat 1, by this method
Blue shape joint and controller seat 8 join together, being integrally formed multiple-pass joint seat 1.
Embodiment 3:(is referring to Fig. 4), union joint 4 is a flange shape joint, no clamp nut 5 on this flange shape joint, and
This flange shape joint is provided with groove, and arranges sealing member 6 on groove.During installation, this flange shape joint is directly sealed solid
It is scheduled on electrical equipment body 7.In addition, this flange shape joint is joined together with multiple-pass joint seat 1, connect by this flange shape
Head is joined together with controller seat 8, the multiple-pass joint seat 1 of being integrally formed.
In sum, this is used for verifying pointer sf6During three way cock's normal operating conditions of gas density controller, from
The sealing member 205 of envelope valve components 2 does not contact with multiple-pass joint seat 1, the gas circuit of air inlet a and gas density controller 10
Passage communicate；To verify or changing gas density controller 10, as long as pulling down valve-opening mechanism 3, now, Self-sealing valve
The sealing member 205 of element 2 in the presence of spring 203 with multiple-pass joint seat 1 reliable contacts, the gas circuit of now air inlet is close with gas
Degree controller 10 passage be not communicated with, be in cut-off state, make gas density controller 10 in gas circuit with electrically set
Standby body 7 separates.And valve-opening mechanism 3 is communicated in gas circuit with the passage of gas density controller 10, now by special
Gas density controller 10 can easily be verified with checking joint.Also replaceable gas density controller under this state same
10.This is used for verifying pointer sf6The three way cock of gas density controller is not only verifying or is changing gas density controller
Without dismounting gas density controller 10 or multiple-pass joint seat 1 during 10, it is that the operation of electric power overhaul personnel brings convenience,
Guarantee the safe handling of electrical equipment, and sealing effectiveness is more preferably, using more safe and reliable and convenient.
The above is presently preferred embodiments of the present invention, and the example above explanation is not made to the flesh and blood of the present invention
Any pro forma restriction, person of an ordinary skill in the technical field is after having read this specification according to the technology of the present invention
Any simple modification or deformation that essence is made to above specific embodiment, and the technology contents possibly also with the disclosure above
Changed or be modified to the Equivalent embodiments of equivalent variations, all still fallen within the range of technical solution of the present invention, without departing from
The spirit and scope of the invention.
Claims (5)
1. one kind is used for verifying pointer sf6The three way cock of gas density controller, it is by multiple-pass joint seat (1), Self-sealing valve unit
Part (2), valve-opening mechanism (3), union joint (4), controller seat (8) constitute it is characterised in that: the top of multiple-pass joint seat (1) leads to
Cross union joint (4) and install with electrical equipment body (7) and be connected, controller seat (8) and gas are passed through in the bottom of multiple-pass joint seat (1)
Density controller (10) is installed and is connected；In multiple-pass joint seat (1), right side makes self-styled valve components (2) installing hole, multiple-pass joint
In seat (1), left side makes valve-opening mechanism (3) installing hole, and self-styled valve components (2) installing hole top is opened and is formed with air inlet (a), opens
Valve system (3) installing hole bottom is opened and is formed with venthole (b)；Self-styled valve components (2) are installed in the hole and are provided with self-styled valve components (2),
Valve-opening mechanism (3) is installed in the hole and is provided with valve-opening mechanism (3)；Self-styled valve components (2) are by valve rod (201), valve element (202), spring
(203), blocking piece (204), sealing member (205) composition；Valve-opening mechanism (3) is by push rod (301), nut (302), back-up ring (303), close
Seal a(304), sealing ring b(305) composition；Valve-opening mechanism (3) passes through the valve element of push rod (301) and self-styled valve components (2)
(202) activity docking, the valve rod (201) of self-styled valve components (2) is provided with spring (203).
2. one kind according to claim 1 is used for verifying pointer sf6The three way cock of gas density controller, its feature
It is: described self-styled valve components (2) are connected with multiple-pass joint seat (1) by sealing member (205), self-styled valve components (2) are passed through
Blocking piece (204) is welded and is fixed in multiple-pass joint seat (1).
3. one kind according to claim 1 is used for verifying pointer sf6The three way cock of gas density controller, its feature
Be: described valve-opening mechanism (3) is arranged in multiple-pass joint seat (1) by nut (302), valve-opening mechanism (3) with connect more
Pass through sealing ring a(304 between headstock (1)) and sealing ring b(305) be tightly connected.
4. one kind according to claim 1 is used for verifying pointer sf6The three way cock of gas density controller, its feature
It is: upper symmetrical making of described push rod (301) has back-up ring (303), and back-up ring (303) plays position-limiting action to nut (302).
5. one kind according to claim 1 is used for verifying pointer sf6The three way cock of gas density controller, its feature
It is: described union joint (4) has two kinds, one kind is with clamp nut formula joint, another kind of is flanged fitting, two kinds of companies
All each make fluted on joint (4), in groove, be placed with sealing member (6), union joint (4) pass through sealing member (6) with electrically
Apparatus body (7) is installed and is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610821813.6A CN106352132A (en) | 2016-09-14 | 2016-09-14 | T-junction used for detecting pointer type SF6 gas density controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610821813.6A CN106352132A (en) | 2016-09-14 | 2016-09-14 | T-junction used for detecting pointer type SF6 gas density controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106352132A true CN106352132A (en) | 2017-01-25 |
Family
ID=57857970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610821813.6A Pending CN106352132A (en) | 2016-09-14 | 2016-09-14 | T-junction used for detecting pointer type SF6 gas density controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106352132A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108801854A (en) * | 2018-06-26 | 2018-11-13 | 南方电网科学研究院有限责任公司 | Gas density measuring device |
| CN108801853A (en) * | 2018-06-26 | 2018-11-13 | 南方电网科学研究院有限责任公司 | Gas density measuring device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001082835A (en) * | 1999-09-13 | 2001-03-30 | Denso Corp | Pressure control valve |
| CN201274257Y (en) * | 2008-06-05 | 2009-07-15 | 上海乐研电气科技有限公司 | Connecting apparatus for checking gas density relay |
| CN101776163A (en) * | 2010-02-09 | 2010-07-14 | 埃德鲁（陕西）机电设备有限公司 | Sulfur hexafluoride gas controllable multi-pass ball valve group |
| CN201820704U (en) * | 2010-09-01 | 2011-05-04 | 上海乐研电气科技有限公司 | Connecting device for checking gas density relay |
| CN104061341A (en) * | 2014-07-03 | 2014-09-24 | 叶平 | Multifunctional SF6 valve with temperature compensation and high sealing performance |
-
2016
- 2016-09-14 CN CN201610821813.6A patent/CN106352132A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001082835A (en) * | 1999-09-13 | 2001-03-30 | Denso Corp | Pressure control valve |
| CN201274257Y (en) * | 2008-06-05 | 2009-07-15 | 上海乐研电气科技有限公司 | Connecting apparatus for checking gas density relay |
| CN101776163A (en) * | 2010-02-09 | 2010-07-14 | 埃德鲁（陕西）机电设备有限公司 | Sulfur hexafluoride gas controllable multi-pass ball valve group |
| CN201820704U (en) * | 2010-09-01 | 2011-05-04 | 上海乐研电气科技有限公司 | Connecting device for checking gas density relay |
| CN104061341A (en) * | 2014-07-03 | 2014-09-24 | 叶平 | Multifunctional SF6 valve with temperature compensation and high sealing performance |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108801854A (en) * | 2018-06-26 | 2018-11-13 | 南方电网科学研究院有限责任公司 | Gas density measuring device |
| CN108801853A (en) * | 2018-06-26 | 2018-11-13 | 南方电网科学研究院有限责任公司 | Gas density measuring device |
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Application publication date: 20170125 |