CN107968018B - High vibration-resistant gas density relay - Google Patents
High vibration-resistant gas density relay Download PDFInfo
- Publication number
- CN107968018B CN107968018B CN201810028412.4A CN201810028412A CN107968018B CN 107968018 B CN107968018 B CN 107968018B CN 201810028412 A CN201810028412 A CN 201810028412A CN 107968018 B CN107968018 B CN 107968018B
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- gas
- density relay
- corrugated pipe
- gas density
- sealing
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- 230000007246 mechanism Effects 0.000 claims abstract description 52
- 238000007789 sealing Methods 0.000 claims abstract description 52
- 238000009413 insulation Methods 0.000 claims abstract description 11
- 230000003750 conditioning effect Effects 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 4
- 230000008054 signal transmission Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 88
- 229910018503 SF6 Inorganic materials 0.000 description 22
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 22
- 229960000909 sulfur hexafluoride Drugs 0.000 description 18
- 238000012544 monitoring process Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
-
- 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
- H01H35/32—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by bellows
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention discloses a high vibration-resistant gas density relay. The density relay includes: the device comprises a shell, a first corrugated pipe, a second corrugated pipe, a micro switch, a spring and a signal adjusting mechanism, wherein one end of the first corrugated pipe is fixed on the inner wall of the shell and is communicated with gas insulation equipment, and the other end of the first corrugated pipe is connected with a first sealing piece in a sealing way; the first corrugated pipe, the first sealing piece, the shell and the gas insulation equipment form a first sealing cavity; one end of the second corrugated pipe is in sealing connection with the first sealing element, the other end of the second corrugated pipe is in sealing connection with the second sealing element, and the first corrugated pipe, the first sealing element, the second corrugated pipe, the second sealing element and the shell form a second sealing cavity filled with compensation gas; the signal adjusting mechanism corresponding to the microswitch is connected with the first sealing element, one end of the spring is connected with the connecting part of the signal adjusting mechanism and the second corrugated pipe, and the other end of the spring is fixed on the spring fixing seat. The density relay has good vibration resistance and high reliability.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a high vibration-resistant gas density relay.
Background
Currently, gas density relays with micro-switches at the contact point are commonly used to monitor the density of insulating gas in gas insulated equipment. Fig. 1 is a schematic structural diagram of a conventional sulfur hexafluoride gas density relay, and as shown in fig. 1, micro switches used in the sulfur hexafluoride gas density relay are all provided with operation arms 1011, 1021, 1031, and the operation arms 1011, 1021, 1031 can be contacted with corresponding signal adjusting mechanisms. The gas density relay with the structure has the advantage of good electrical performance, but due to the fact that the length of the contact operation arm 102 is long and the contact operation arm belongs to a cantilever beam, extremely small vibration in the working environment can cause the vibration of the contact operation arm 102 to be large, so that the sulfur hexafluoride gas density relay is in misoperation, even the micro switch is destroyed, and the sulfur hexafluoride gas density relay cannot work normally. Therefore, how to provide a gas density relay with good vibration resistance is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a high vibration-resistant gas density relay, which can improve the vibration resistance of the gas density relay, thereby improving the reliability of the gas density relay.
In order to achieve the above object, the present invention provides the following solutions:
a high vibration resistant gas density relay connected with a gas insulated device, the high vibration resistant gas density relay comprising: the shell, the first corrugated pipe, the second corrugated pipe, the micro switch, the spring and the signal adjusting mechanism, wherein,
the first opening end of the first corrugated pipe is fixed on the inner wall of the shell, the first corrugated pipe is communicated with insulating gas in the gas insulation equipment, and the second opening end of the first corrugated pipe is in sealing connection with the first sealing piece; the inner wall of the first bellows, the first seal, the inner wall of the housing, and the gas-insulated apparatus together define a first sealed cavity;
the first opening end of the second corrugated pipe is in sealing connection with the first sealing element, the second opening end of the second corrugated pipe is in sealing connection with the second sealing element, the outer wall of the first corrugated pipe, the first sealing element, the outer wall of the second corrugated pipe, the second sealing element and the inner wall of the shell jointly define a second sealing cavity, and the second sealing cavity is filled with compensation gas;
the signal adjusting mechanism is connected with the first sealing element, the micro switch is arranged corresponding to the signal adjusting mechanism, the first end of the spring is connected to the connecting part of the signal adjusting mechanism and the first sealing element, and the second end of the spring is fixed on the spring fixing seat.
Optionally, the extension of the signal conditioning mechanism extends into the second bellows, wherein the extension of the signal conditioning mechanism is an end of the signal conditioning mechanism connected to the second bellows.
Optionally, an extension of the signal conditioning mechanism is connected to the first seal.
Optionally, the spring fixing seat is disposed between the second bellows and the micro switch.
Optionally, the gas density relay is further provided with a temperature sensing bulb, and the compensation gas is connected with the temperature sensing bulb through a connecting gas pipe.
Optionally, the gas density relay further comprises a pressure sensor and/or a temperature sensor arranged in the first sealed cavity.
Optionally, a display mechanism for displaying the density of the insulating gas in the gas insulation device is further arranged on the shell.
Optionally, the display mechanism specifically includes: the device comprises a connecting mechanism, a movement, a dial and a pointer; wherein,
the movement is connected with the signal adjusting mechanism through the connecting mechanism, and the pointer is arranged on the movement and is arranged in front of the dial.
Optionally, the display mechanism specifically includes: display the Bardon tube, temperature compensation component, display end seat, movement, dial, pointer and base; wherein,
one end of the display Bardon tube and one end of the temperature compensation element are both fixed on the display end seat, the other end of the display Bardon tube is connected to the base, the other end of the temperature compensation element is connected with the movement, and the pointer is installed on the movement and arranged in front of the dial.
Optionally, the gas density relay is further provided with a heat insulation layer wrapping the first sealing cavity and the second sealing cavity.
Optionally, the first seal is an integral part or is composed of a split part.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the gas density relay provided by the invention, the first end of the spring is connected to the connecting part of the signal adjusting mechanism and the second corrugated pipe, the pressure change caused by the gas density change is transmitted to the spring through the first corrugated pipe and the second corrugated pipe, the corrugated pipe is mainly used for transmitting pressure, and the actual pressure measurement is performed by the spring. The spring has small volume and good stability, so that the vibration resistance of the gas density relay can be greatly improved.
The invention adopts the double bellows structure design, the joint debugging is very convenient, and the production requirements of density relays with various pressures can be met. The gas density relay provided by the invention has the advantages of convenience in production, low manufacturing cost, high monitoring precision, good electrical performance, long service life, capability of working under the oil-free condition and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a sulfur hexafluoride gas density relay of the prior art;
FIG. 2 is a schematic partial cross-sectional view of a high vibration resistant sulfur hexafluoride gas density relay provided by an embodiment of the invention;
fig. 3 is a schematic partial cross-sectional view of a high vibration resistance wide range gas density relay according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a high vibration-resistant gas density relay, which can improve the vibration resistance of the gas density relay, thereby improving the reliability of the gas density relay.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
In this embodiment, the sulfur hexafluoride gas density relay is taken as an example, and the structure of the high vibration-resistant gas density relay provided by the invention is introduced.
Fig. 2 is a schematic partial cross-sectional view of a sulfur hexafluoride gas density relay with high vibration resistance according to an embodiment of the invention. As shown in fig. 2, a high vibration-resistant gas density relay connected with a gas-insulated device, the high vibration-resistant gas density relay comprising: a housing 1, a first bellows 2, a second bellows 3, a micro switch 4, a signal adjusting mechanism 5 and a spring 6, wherein,
the shell 1 is provided with an opening, a first opening end of the first corrugated pipe 2 is fixed on the inner wall of the shell 1 through welding, the first corrugated pipe 2 is communicated with insulating gas in the gas insulation equipment 7 through the opening, and a second opening end of the first corrugated pipe 2 is in sealing connection with the first sealing piece 8; the inner wall of the first bellows 2, the first seal 8, the inner wall of the housing 1 and the gas insulation apparatus 7 together define a first sealed cavity A1;
the first opening end of the second corrugated pipe 3 is in sealing connection with the first sealing element 8, the second opening end of the second corrugated pipe 3 is in sealing connection with the second sealing element 9, the outer wall of the first corrugated pipe 2, the first sealing element 8, the outer wall of the second corrugated pipe 3, the second sealing element 9 and the inner wall of the shell 1 jointly define a second sealing cavity A2, and the second sealing cavity A2 is filled with compensation gas;
the signal adjusting mechanism 5 is connected with the first sealing element 8, the micro switch 4 is arranged corresponding to the signal adjusting mechanism 5, a first end of the spring 6 is connected to the connecting part of the signal adjusting mechanism 5, the first sealing element 8 and the second corrugated tube 3, a second end of the spring 6 is connected to the spring fixing seat 10 through the spring adjusting element, and the spring fixing seat 10 is arranged between the second corrugated tube 3 and the micro switch 4. In this embodiment, the signal adjusting mechanism 5 includes an adjusting screw 501, an adjusting rod 502, and a disc 503, where the adjusting screw 501 is disposed on the disc 503.
In this embodiment, the extension of the signal conditioning mechanism 5 extends into the second bellows 3 and is connected to the first seal 8, wherein the extension of the signal conditioning mechanism 5 is the end of the signal conditioning mechanism 5 connected to the second bellows 3. The spring fixing seat 10 is arranged between the second corrugated pipe 3 and the micro switch 4.
Further, the housing 1 of the gas relay provided in the present embodiment is further provided with a display mechanism 11 for displaying the density of the insulating gas in the gas insulation device.
As shown in fig. 2, the display mechanism 11 specifically includes: a connection 1101, a movement 1102, a dial 1103, and a pointer 1104; wherein,
the movement 1102 is connected with the signal adjusting mechanism 5 through the connecting mechanism 1101, and the pointer 1104 is mounted on the movement 1102 and is arranged in front of the dial 1103.
Preferably, the gas density relay is further provided with a temperature sensing bulb, and the compensation gas is connected with the temperature sensing bulb through a connecting gas pipe, so that the gas density relay can be used for occasions with large temperature difference between the density relay and equipment. The gas density relay is further provided with an insulating layer 12 wrapping the first sealed cavity A1 and the second sealed cavity A2.
In order to realize on-line monitoring, the gas density relay is also provided with a pressure sensor and/or a temperature sensor, wherein,
the pressure sensor and the temperature sensor are both arranged in the first sealed cavity. The pressure sensor and/or the temperature sensor are/is connected with the signal processing unit, and the signal processing unit is connected with the signal transmission unit. Therefore, the gas density relay provided by the embodiment has a remote signal, and can realize on-line monitoring of density.
Further, the gas density relay provided in this embodiment is further provided with a holding mechanism and a reset mechanism after the signal operation.
Optionally, the first sealed cavity A1 and the second sealed cavity A2 may be formed in the following manner: both ends of the first corrugated pipe 2 are sealed to form a first sealed cavity A1, and the first sealed cavity A1 is filled with compensation gas. The two ends of the second corrugated pipe 3 are sealed to form a second sealed cavity A2, the outer wall of the first corrugated pipe 2, the outer wall of the second corrugated pipe 3 and the inner wall of the shell 1 jointly define to form the second sealed cavity A2, and the second sealed cavity A2 is communicated with sulfur hexafluoride electrical equipment.
Optionally, the first sealing member 8 is an integral part or is composed of a split part.
The working principle of the high vibration-resistant sulfur hexafluoride gas density relay provided by the invention is as follows: after adjusting the adjusting screw 501, the sealing of the cavity A2 is typically achieved by welding. And then the sealed cavity A2 is vacuumized, and compensating gas with corresponding pressure is filled into the sealed cavity A2 according to the rated pressure, the alarm pressure, the locking pressure and other parameters of the Gao Kangzhen sulfur hexafluoride gas density relay. The greater the density of the sealed cavity A2 and the sealed cavity A1 at the same ambient temperature, the greater the pressure. If SF6 (sulfur hexafluoride) electrical equipment does not leak gas, the high vibration-resistant sulfur hexafluoride gas density relay does not send out an alarm locking signal; if SF6 electrical equipment leaks, when SF6 gas density in SF6 electrical equipment is close to or is lower than the density of the compensation gas in the sealed cavity A2, the high vibration-resistant sulfur hexafluoride gas density relay sends out an alarm locking signal, and power grid safety is ensured.
The specific process is as follows: when the electrical equipment is normal, the density ρ of the sealed air chamber A1 1 Density ρ greater than seal air chamber A2 2 I.e. ρ 1 >ρ 2 . When the gas pressure P1 of the sealed gas chamber A1 is greater than the pressure P2 of the sealed gas chamber A2, i.e. the difference DeltaP between P1 and P2 is greater than a certain set value, as can be seen from FIG. 2, the adjusting screw 5A corresponding distance L exists between 01 and the micro switch 4, and at this time, the adjusting screw 501 of the signal adjusting mechanism 5 does not contact the micro switch 4, i.e. does not trigger the micro switch 4, so that the micro switch 4 does not act, and the contact signal thereof is not output. Conversely, if the gas insulation device leaks, the gas density value of the sealed gas chamber A1 decreases, and the gas pressure value of the sealed gas chamber A1 also decreases, when the density value thereof decreases to a certain degree (reaches an alarm or lock value) close to or lower than the gas density value of the sealed gas chamber A2, i.e., when Δp is smaller than a certain set value, L in fig. 2 decreases, and when L is smaller than a corresponding value, the adjusting screw 501 of the signal adjusting mechanism 5 contacts the micro switch 4, i.e., triggers the micro switch 4, so that the corresponding micro switch 4 contact is turned on, and a corresponding signal (alarm or lock) is sent, thereby monitoring and controlling the gas density in the high voltage switch and other devices, and making the electrical device work safely. The pressure difference between the air chamber A1 and the air chamber A2 changes, so that the adjusting rod 502 moves up and down, and the adjusting rod 502 is connected with the movement 1102 through the connecting mechanism 1101. When the pressure changes, there is a pressure difference, which is transmitted to the movement 1102 through the adjustment lever 502 and the connection mechanism 1101, and the pressure is displayed on the dial 1103 through the movement 1102 and the pointer 1103.
Fig. 3 is a schematic partial cross-sectional view of a high vibration resistance wide range gas density relay according to an embodiment of the present invention. As shown in fig. 3, in order to expand the range of the gas density relay, the display mechanism 11 in this embodiment specifically includes: movement 1102, dial 1103, pointer 1104, display barden tube 1105, temperature compensation element 1106, display end seat 1107 and base 1108; wherein,
one end of the display barden tube 1105 and one end of the temperature compensation element 1106 are both fixed on the display end seat 1107, the other end of the display barden tube 1105 is connected to the base 1108, the other end of the temperature compensation element 1106 is connected to the movement 1102 through a connecting rod or the other end of the temperature compensation element 1106 is directly connected to the movement 1102, and the pointer 1104 is mounted on the movement 1102 and is disposed in front of the dial 1103. The pedestal 1108 communicates with the gas-insulated device 7 in a gas path.
The high vibration-resistant gas density relay shown in fig. 3 can easily realize the full range (-0.1-0.9 MPa), especially the display with the initial value of-0.1 MPa, and the vacuum degree can be displayed when vacuumizing, so that the popularization and the application are convenient.
The gas density relay provided in this embodiment is applicable to all insulating gases such as sulfur hexafluoride gas mixture, nitrogen, dry air, compressed air, and the like, and is also applicable to monitoring the density of all insulating gases such as sulfur hexafluoride gas, sulfur hexafluoride gas mixture, nitrogen, dry air, compressed air, and the like, in addition to sulfur hexafluoride gas.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (9)
1. A high vibration resistant gas density relay, wherein the gas density relay is connected with a gas insulating device, the high vibration resistant gas density relay comprising: the shell, the first corrugated pipe, the second corrugated pipe, the micro switch, the spring and the signal adjusting mechanism, wherein,
the first opening end of the first corrugated pipe is fixed on the inner wall of the shell, the first corrugated pipe is communicated with insulating gas in the gas insulation equipment, and the second opening end of the first corrugated pipe is in sealing connection with the first sealing piece; the inner wall of the first bellows, the first seal, the inner wall of the housing, and the gas-insulated apparatus together define a first sealed cavity;
the first opening end of the second corrugated pipe is in sealing connection with the first sealing element, the second opening end of the second corrugated pipe is in sealing connection with the second sealing element, the outer wall of the first corrugated pipe, the first sealing element, the outer wall of the second corrugated pipe, the second sealing element and the inner wall of the shell jointly define a second sealing cavity, and the second sealing cavity is filled with compensation gas;
the signal adjusting mechanism is connected with the first sealing element, the micro switch is arranged corresponding to the signal adjusting mechanism, the first end of the spring is connected with the connecting part of the signal adjusting mechanism and the first sealing element, and the second end of the spring is fixed on the spring fixing seat;
the gas density relay is also provided with a temperature sensing bulb, and the compensation gas is connected with the temperature sensing bulb through a connecting gas pipe;
the gas density relay further comprises a pressure sensor and/or a temperature sensor arranged in the first sealed cavity; the pressure sensor and/or the temperature sensor are/is connected with the signal processing unit, and the signal processing unit is connected with the signal transmission unit.
2. The gas density relay of claim 1, wherein the extension of the signal conditioning mechanism extends into the second bellows, wherein the extension of the signal conditioning mechanism is an end of the signal conditioning mechanism that is connected to the second bellows.
3. The gas density relay of claim 2, wherein the extension of the signal conditioning mechanism is connected to the first seal.
4. A gas density relay according to claim 3, wherein the spring holder is disposed between the second bellows and the micro switch.
5. The gas density relay according to claim 1, wherein a display mechanism for displaying the density of the insulating gas in the gas insulating apparatus is further provided on the housing.
6. The gas density relay of claim 5, wherein the display mechanism specifically comprises: the device comprises a connecting mechanism, a movement, a dial and a pointer; wherein,
the movement is connected with the signal adjusting mechanism through the connecting mechanism, and the pointer is arranged on the movement and is arranged in front of the dial.
7. The gas density relay of claim 5, wherein the display mechanism specifically comprises: display the Bardon tube, temperature compensation component, display end seat, movement, dial, pointer and base; wherein,
one end of the display Bardon tube and one end of the temperature compensation element are both fixed on the display end seat, the other end of the display Bardon tube is connected to the base, the other end of the temperature compensation element is connected with the movement, and the pointer is installed on the movement and arranged in front of the dial.
8. The gas density relay of any one of claims 1-7, further provided with a thermal insulation layer surrounding the first and second sealed cavities.
9. The gas density relay of claim 1, wherein the first seal is a unitary part or is comprised of a split part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810028412.4A CN107968018B (en) | 2018-01-12 | 2018-01-12 | High vibration-resistant gas density relay |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810028412.4A CN107968018B (en) | 2018-01-12 | 2018-01-12 | High vibration-resistant gas density relay |
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| CN107968018A CN107968018A (en) | 2018-04-27 |
| CN107968018B true CN107968018B (en) | 2023-12-08 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11867712B2 (en) * | 2018-12-18 | 2024-01-09 | Wika Alexander Wiegand Se & Co. Kg | Gas densimeter |
| CN110416024B (en) * | 2019-09-04 | 2024-06-14 | 上海乐研电气有限公司 | Vibration-resistant digital display gas density relay |
| CN110646727A (en) * | 2019-09-04 | 2020-01-03 | 上海乐研电气有限公司 | Overvoltage-resistant remote transmission gas density relay |
| CN110459431B (en) * | 2019-09-04 | 2024-08-23 | 上海乐研电气有限公司 | Vibration-resistant remote gas density relay |
| CN111243881A (en) * | 2020-03-11 | 2020-06-05 | 上海乐研电气有限公司 | Thin high vibration resistance gas density relay |
| CN111192790A (en) * | 2020-03-11 | 2020-05-22 | 上海乐研电气有限公司 | Wide-range high-vibration-resistance gas density relay |
| CN111192791A (en) * | 2020-03-11 | 2020-05-22 | 上海乐研电气有限公司 | High-vibration-resistance gas density relay |
| CN111952105B (en) * | 2020-07-07 | 2022-07-12 | 国家电网有限公司 | Full-range high-precision remote transmission type sulfur hexafluoride gas density relay |
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| US4057699A (en) * | 1974-04-10 | 1977-11-08 | United Electric Controls Company | Density control monitor with opposing bellows |
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