CN210196577U - Pressure relief valve of transformer - Google Patents
Pressure relief valve of transformer Download PDFInfo
- Publication number
- CN210196577U CN210196577U CN201921119817.5U CN201921119817U CN210196577U CN 210196577 U CN210196577 U CN 210196577U CN 201921119817 U CN201921119817 U CN 201921119817U CN 210196577 U CN210196577 U CN 210196577U
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- CN
- China
- Prior art keywords
- pressure relief
- proximity switch
- relief valve
- transformer
- housing
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- Expired - Fee Related
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Abstract
The utility model discloses a transformer pressure relief valve, including setting up the flagpole on pressure release ware, the one end that pressure release ware was kept away from to the flagpole is provided with the metal indicator, be provided with the proximity switch who is used for perception and the change of metal body indicator interval on the pressure release ware, proximity switch is connected with tripping circuit electricity. The utility model discloses following beneficial effect has: the pressure release valve changes the micro switch into the metal proximity switch, so that the equipment detection is more visual, the replacement of accessories is more convenient and fast, and the pressure release valve is not influenced by environmental factors.
Description
Technical Field
The utility model relates to a transformer pressure release protection device, in particular to transformer pressure release valve.
Background
The pressure relief valve is a pressure protection device of the transformer, and when a serious fault occurs in the transformer, the pressure relief valve enables abnormal pressure generated by oil expansion and decomposition to be timely released so as to avoid damaging an oil tank and causing larger damage.
For example, chinese patent publication No. CN105402480A discloses a pressure relief valve, which is connected to a transformer tank body through a valve seat during operation, when an accident occurs inside a transformer, the oil pressure inside the transformer tank rises sharply to reach a pressure value at which the pressure relief valve opens, the cover is bounced to drive the flag rod to be jacked up, the spring is compressed continuously, the transformer oil leaks, the pressure inside the transformer tank decreases, and when the pressure decreases to a pressure value at which the pressure relief valve closes, the spring and the cover are reset, and the pressure relief valve closes, so that a positive pressure is maintained inside the transformer tank.
The pressure relief valve is used for protecting the transformer by connecting a transformer tripping loop through the action of a microswitch arranged beside an internal sign post, and simultaneously, the pressure relief operation is carried out by compressing a spring. However, because the pressure relief valve provided with the microswitch is non-sealed, and the action of the microswitch requires external force transmission, the microswitch cannot be sealed, so that the microswitch is easily influenced by water or condensation, a short circuit of a switch internal node is formed, a pressure relief action signal is mistakenly sent, the switch tripping is caused, and the non-fault power failure of a power system is caused. If change when breaking down is very inconvenient, need demolish pressure release switch top, need spend longer time because of the installation of position narrowness after demolising, the operation of can not changing in rainy day simultaneously, awaits improving.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model provides a transformer pressure relief valve, this kind of pressure relief valve change micro-gap switch into metal proximity switch, make equipment detection more accurate, and it is more convenient not influenced by environmental factor to change the accessory.
The above technical purpose of the present invention can be achieved by the following technical solutions: the pressure release valve of the transformer comprises a mark rod arranged on a pressure release device, wherein a metal body indicator is arranged at one end, away from the pressure release device, of the mark rod, and a proximity switch used for sensing whether the metal body indicator rises to enter a sensing range or not is arranged on the pressure release device.
The utility model discloses further set up to: the proximity switch is electrically connected to the trip circuit.
The utility model discloses further set up to: the pressure releaser comprises a housing, a valve seat arranged in the housing, a membrane disc arranged on the valve seat, a spring sleeved on the marker rod and a pressing plate bearing the spring, wherein one end of the marker rod is connected with the membrane disc, and the other end of the marker rod penetrates through the pressing plate to be connected with the metal body indicator.
The utility model discloses further set up to: one end of the metal body indicator penetrates out of the housing and is in sliding connection with the housing.
The utility model discloses further set up to: the proximity switch is arranged on the outer surface of the cover shell and can sense the change of the distance between the proximity switch and the metal body indicator.
The utility model discloses further set up to: the tripping circuit comprises a voltage reduction resistor, a protection device and a solid-state relay which are sequentially and electrically connected, and two ends of the proximity switch are respectively and electrically connected with the voltage reduction resistor and the solid-state relay.
The utility model discloses further set up to: the metal body indicator comprises a moving part and an induction head, wherein the moving part is in sliding connection with the housing, the induction head is inducted with the proximity switch, one end of the moving part in the housing is connected with the marking rod, and one end of the moving part outside the housing is integrally connected with the induction head.
The utility model discloses further set up to: the cross-sectional area of the induction head part is larger than that of the moving part.
The utility model discloses further set up to: and the tail part of the proximity switch is provided with a light emitting diode.
To sum up, the utility model discloses following beneficial effect has: when an accident occurs inside the transformer, the oil pressure inside the transformer oil tank rises sharply to reach the opening pressure value of the pressure releaser, the pressure releaser is opened at the moment, and the mark rod is jacked up to drive the metal body indicator to jack up. When the metal body indicator reaches the sensing area of the proximity switch in the jacking process, the proximity switch can rapidly send out an electrical command under the conditions of no contact, no pressure and no spark and drive the tripping circuit to be disconnected, so that the transformer is protected. The proximity switch has good sealing performance, can be normally used in non-metal environments such as water, oil and the like, can prevent rainwater from entering the proximity switch, and ensures the correctness of a pressure release switch signal; meanwhile, the original internal installation is changed into the external installation, so that the equipment detection is more visual, the accessory replacement is more convenient and fast, and the influence of environmental factors is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic structural view of a pressure relief valve according to a first embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a trip circuit according to an embodiment of the present invention;
fig. 3 is a structural sectional view of the metal body indicator of fig. 1.
Reference numerals: 1. a pressure releaser; 2. a marker post; 3. a metal body indicator; 4. a proximity switch; 5. a trip loop; 6. a housing; 7. a valve seat; 8. a membrane disc; 9. a spring; 10. pressing a plate; 11. a voltage reduction resistor; 12. a protection device; 13. a solid state relay; 14. a moving part; 15. a head is sensed.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.
As shown in fig. 1-3, a pressure relief valve for a transformer comprises a sign rod 2 disposed on a pressure relief device 1, a metal indicator 3 disposed at one end of the sign rod 2 away from the pressure relief device, a proximity switch 4 disposed on the pressure relief device 1 for sensing a distance change between the pressure relief device and the metal indicator 3, and a trip circuit 5 electrically connected to the proximity switch 4.
When an accident happens inside the transformer, the oil pressure inside the transformer oil tank rises sharply to reach the opening pressure value of the pressure releaser, the pressure releaser is opened at the moment, and the mark rod 2 is jacked up to drive the metal body indicator 3 to jack up. When the metal body indicator 3 is jacked up, the sensing area of the proximity switch 4 is reached, so that the proximity switch 4 rapidly sends out an electrical command under the conditions of no contact, no pressure and no spark, and drives the tripping circuit 5 to be disconnected, thereby playing a role in protecting the transformer. The proximity switch 4 has good sealing performance, can be normally used in non-metal environments such as water, oil and the like, can prevent rainwater from entering the proximity switch 4, and ensures the correctness of a pressure release switch signal; meanwhile, the original internal installation is changed into the external installation, so that the equipment detection is more visual, the accessory replacement is more convenient and fast, and the influence of environmental factors is avoided.
Further, the pressure releaser comprises a housing 6, a valve seat 7 arranged in the housing 6, a membrane disc 8 arranged on the valve seat 7, a spring 9 sleeved on the marking rod 2 and a pressing plate 10 bearing on the spring 9, wherein one end of the marking rod 2 is connected with the membrane disc 8, the other end of the marking rod 2 penetrates through the pressing plate 10 to be connected with the metal body indicating piece 3, and one end of the metal body indicating piece 3 penetrates out of the housing 6 and is in sliding connection with the housing 6.
Further, the proximity switch 4 is disposed on the outer surface of the cover 6 and can sense a change in the distance from the metal indicator 3.
When an accident occurs inside the transformer, the oil pressure inside the transformer oil tank rises sharply to reach the opening pressure value of the pressure releaser, the pressure releaser is opened, the membrane disc 8 is bounced to drive the sign rod 2 to be jacked up, the spring 9 continues to be compressed, the transformer oil leaks out, and the pressure inside the transformer oil tank is reduced. Meanwhile, the metal body indicator 3 is ejected out of the housing 6 to be sensed by the proximity switch 4 to change the distance, and the proximity switch 4 can rapidly send out an electrical command and drive the tripping circuit 5 to be disconnected, so that the transformer protection function is realized.
Further, the trip circuit 5 includes a voltage reduction resistor 11, a protection device 12 and a solid-state relay 13 which are electrically connected in sequence, and both ends of the proximity switch 4 are electrically connected with the voltage reduction resistor 11 and the solid-state relay 13 respectively. The input of the solid-state relay 13 is supplied with a small control signal to directly drive the high-power switching actuator, which in this embodiment is the protective device 12. And the step-down resistor 11 can convert the high voltage from the protection device 12 to a low voltage suitable for the proximity switch 4, thereby forming the entire trip loop 5.
Furthermore, the metal body indicator 3 comprises a moving part 14 connected with the housing 6 in a sliding manner and a sensing head 15 sensing the proximity switch 4, wherein one end of the moving part 14 in the housing 6 is connected with the sign rod 2, and one end of the moving part 14 outside the housing 6 is integrally connected with the sensing head 15.
Further, the cross-sectional area of the sensing head 15 is larger than that of the moving part 14, so that the cross-section of the metal body indicator 3 is a T-shaped structure.
Furthermore, the tail part of the proximity switch is provided with a light emitting diode for indicating, so that auxiliary equipment is not needed at night, and whether the pressure release valve acts can be observed by naked eyes under the condition of keeping away from a fault transformer.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.
Claims (9)
1. A transformer pressure relief valve, includes setting up sign pole (2) on pressure relief ware (1), characterized by: one end of the marking rod (2) far away from the pressure releaser is provided with a metal body indicator (3), and the pressure releaser is provided with a proximity switch (4) used for sensing whether the metal body indicator (3) rises to enter a sensing range or not (1).
2. A transformer pressure relief valve as claimed in claim 1 wherein: the proximity switch (4) is electrically connected with the tripping circuit (5).
3. A transformer pressure relief valve as claimed in claim 1 wherein: the pressure releaser comprises a housing (6), a valve seat (7) arranged in the housing (6), a membrane disc (8) arranged on the valve seat (7), a spring (9) sleeved on the marking rod (2) and a pressing plate (10) placed on the spring (9), wherein one end of the marking rod (2) is connected with the membrane disc (8), and the other end of the marking rod (2) penetrates through the pressing plate (10) to be connected with the metal body indicating piece (3).
4. A transformer pressure relief valve as claimed in claim 3 wherein: one end of the metal body indicator (3) penetrates out of the housing (6) and is connected with the housing (6) in a sliding mode.
5. The transformer pressure relief valve as recited in claim 4 wherein: the proximity switch (4) is arranged on the outer surface of the cover (6) and can sense the change of the distance between the proximity switch and the metal body indicator (3).
6. A transformer pressure relief valve as claimed in claim 2 wherein: the tripping circuit (5) comprises a voltage reduction resistor (11), a protection device (12) and a solid-state relay (13) which are sequentially and electrically connected, and two ends of the proximity switch (4) are respectively and electrically connected with the voltage reduction resistor (11) and the solid-state relay (13).
7. The transformer pressure relief valve as recited in claim 5 wherein: the metal body indicator (3) comprises a moving part (14) in sliding connection with the housing (6) and an induction head (15) inducted by the proximity switch (4), wherein the moving part (14) is connected with the marking rod (2) at one end in the housing (6), and the moving part (14) is integrally connected with the induction head (15) at one end outside the housing (6).
8. The transformer pressure relief valve as recited in claim 7 wherein: the cross-sectional area of the induction head (15) is larger than that of the moving part (14).
9. A transformer pressure relief valve as claimed in claim 1 wherein: and the tail part of the proximity switch (4) is provided with a light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921119817.5U CN210196577U (en) | 2019-07-17 | 2019-07-17 | Pressure relief valve of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921119817.5U CN210196577U (en) | 2019-07-17 | 2019-07-17 | Pressure relief valve of transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210196577U true CN210196577U (en) | 2020-03-27 |
Family
ID=69867892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921119817.5U Expired - Fee Related CN210196577U (en) | 2019-07-17 | 2019-07-17 | Pressure relief valve of transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210196577U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112628434A (en) * | 2020-12-04 | 2021-04-09 | 国网山东省电力公司临沂供电公司 | Intelligent pressure release valve and use method |
-
2019
- 2019-07-17 CN CN201921119817.5U patent/CN210196577U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112628434A (en) * | 2020-12-04 | 2021-04-09 | 国网山东省电力公司临沂供电公司 | Intelligent pressure release valve and use method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200327 Termination date: 20210717 |