CN115306930A - Pressure relief valve for power transformer and power transformer - Google Patents
Pressure relief valve for power transformer and power transformer Download PDFInfo
- Publication number
- CN115306930A CN115306930A CN202111521445.0A CN202111521445A CN115306930A CN 115306930 A CN115306930 A CN 115306930A CN 202111521445 A CN202111521445 A CN 202111521445A CN 115306930 A CN115306930 A CN 115306930A
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- China
- Prior art keywords
- base
- top cover
- spring
- pressure relief
- relief valve
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- 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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
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- 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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/164—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining closed after return of the normal pressure
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- 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
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0025—Electrical or magnetic means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
- Safety Valves (AREA)
Abstract
The application provides a pressure release valve and power transformer for power transformer, pressure release valve includes: the base is provided with a through hole, and the first end of the base can be communicated with the transformer oil tank; the supporting device is arranged on the base, and the valve disc is arranged on the second end of the base in a sealing mode; the top cover is arranged on one side of the supporting device, which is far away from the base; the spring assembly is arranged between the valve disc and the top cover; the first end of the indicating rod is fixed on the valve disc, and the second end of the indicating rod can penetrate out of the top cover; the cover is arranged between the base and the top cover and used for sealing the base and the top cover, and the cover can be opened under the action of internal pressure. When the pressure release valve is opened, the cover can be automatically opened, the opening of the cover enhances the pressure release capacity, the flow guide resistance of the cover is greatly reduced, the internal backlog of the release valve is greatly reduced, the safety and the working stability of a valve body of the pressure release valve are improved, the cover can be automatically closed, the sealing and killing of the intrusion of rain and snow can be prevented, and the cleanness inside the release valve can be kept.
Description
Technical Field
The invention belongs to the technical field of transformer pressure relief valves, and particularly relates to a rapid safety pressure relief valve with a self-adaptive opening and closing housing for an arc fault of a tap switch oil chamber in a power transformer and the power transformer.
Background
When the high-voltage transformer is in operation failure, electric arcs can be generated, insulating oil of the high-voltage transformer is vaporized and cracked by the energy of electric arc discharge, a large amount of high-temperature oil gas is generated, the internal pressure is suddenly increased, the failure of a mechanical structure of the transformer can be caused, and the fire and explosion hazards can be caused when the high-temperature high-voltage oil gas leaks to be in contact with air. The traditional solution is for setting up one or more relief valve, when grease chamber internal pressure risees, opens the relief valve, with high temperature high pressure oil gas emission atmosphere, reduces internal pressure, prevents to take place to explode.
The related research and design of the existing pressure relief valve do not consider the influence of the outer cover on the discharge capacity, and do not consider the structural optimization of the outer cover. The air guide sleeve of the existing pressure release valve is divided into a guide type or a non-guide standard type and is used for blocking the invasion of wind, sand, snow and rain and preventing the flying of bird and insect. However, the flow of gas-liquid mixture can be obviously retarded by the diversion cover with any structure, on one hand, the discharge capacity of the pressure release valve is reduced, on the other hand, pressure overload is generated inside the pressure release valve when the pressure is higher, the pressure born by the pressure release valve is further improved, and safety accidents are very easy to happen.
Disclosure of Invention
Accordingly, the present invention is directed to a pressure relief valve for a power transformer and a power transformer, so as to solve or overcome at least one of the technical problems in the prior art.
In a first aspect, the present application provides a pressure relief valve for an electrical transformer, comprising:
the transformer oil tank is provided with a through hole, and the first end of the base can be communicated with the transformer oil tank;
a support device disposed on the base,
a valve disc sealingly disposed on the second end of the base;
the top cover is arranged on one side, away from the base, of the supporting device;
a spring assembly disposed between the valve disc and the top cap;
the first end of the indicating rod is fixed on the valve disc, and the second end of the indicating rod can penetrate out of the top cover;
and a cover disposed between the base and the top cover for closing the base and the top cover, the cover being openable under internal pressure.
Further, the first end of the base is provided with a connecting flange, and the connecting flange can be communicated with the transformer oil tank in a sealing mode.
Further, a sealing member is arranged at the second end of the base, and the valve disc is tightly pressed on the sealing member under the action of the spring assembly;
the seal includes:
the rubber ring is attached to and arranged in a groove formed in the second end of the base;
and the blank holder is attached to the rubber ring.
Furthermore, the supporting device comprises a plurality of stand columns, and the stand columns are circumferentially distributed and connected on the base and the top cover.
Furthermore, two ends of each upright post are respectively connected to the base and the top cover through screws.
Furthermore, a plurality of clamping grooves are formed in the side faces, opposite to the top cover, of the base and used for containing the stand columns.
Further, the valve disc is of a disc-shaped structure,
the peripheral wall of the valve disc is attached to each upright column and can slide along the axial direction of each upright column.
Further, the spring assembly comprises a first spring and a second spring, the diameter of the first spring is smaller than that of the second spring, the second spring is coaxially sleeved on the first spring, and two ends of the first spring and two ends of the second spring are respectively connected to the valve disc and the top cover.
Further, the cover shell comprises a plurality of protection plates, one side of each protection plate is hinged to the top cover, and each protection plate is attached to the base through magnetic attraction.
Furthermore, each protection plate is hinged to the top cover through a spring hinge, and sealing strips are arranged on the side faces, facing the valve disc and the top cover, of the protection plates.
Furthermore, the cover shell is polygonal, and a plurality of protection plates which are symmetrically opened are arranged on the cover shell.
In a second aspect, there is provided a power transformer to which the pressure relief valve for a power transformer according to any one of the above is applied.
The application has the following beneficial effects:
the application provides a pressure release valve and power transformer for power transformer can open when pressure release valve opens, and the housing can be opened automatically, and opening of housing has strengthened pressure release ability, has greatly reduced housing water conservancy diversion resistance for the inside backlog of release valve reduces by a wide margin, has improved the security and the job stabilization nature of pressure release valve body, and the housing can self-closing, can prevent to seal the invasion of killing sleet, keeps the inside cleanness of release valve.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
FIG. 1 is a front view of a pressure relief valve for an electrical power transformer provided in accordance with an embodiment of the present invention;
FIG. 2 isbase:Sub>A sectional view taken along line A-A of FIG. 1;
FIG. 3 is a top view of a pressure relief valve for an electrical transformer provided in accordance with an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating an open state of a protection plate according to an embodiment of the present invention.
The device comprises a base 1, a protection plate 2, a top cover 3, a signal rod 4, a valve disc 5, a column 6, a first spring 7, a second spring 8, a rubber ring 9, a blank holder 10, a connecting flange 11 and a magnet 12.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
Referring to fig. 1 to 3, the present application provides a pressure relief valve (relief valve for short) for an electric power transformer, including: the transformer oil tank is characterized by comprising a base 1, wherein a through hole is formed in the base 1, and a first end of the base 1 can be communicated with the transformer oil tank; the supporting device is arranged on the base 1, and the valve disc 5 is arranged on the second end of the base 1 in a sealing mode; the top cover 3 is arranged on one side, away from the base 1, of the supporting device; a spring assembly disposed between the valve disc 5 and the top cover 3; an indicator rod, the first end of which is fixed on the valve disc 5 and the second end of which can penetrate out of the top cover 3; a cover which is arranged between the base 1 and the top cover 3, is used for sealing the base 1 and the top cover 3, and can be opened under the action of internal pressure.
In the present embodiment, referring to fig. 2 and 3, the first end of the base 1 is provided with a connecting flange 11, and the connecting flange 11 can be in sealed communication with the transformer tank. As will be appreciated by those skilled in the art, a gasket is provided between the attachment flange 11 and the transformer tank to ensure sealing.
Referring to fig. 2, the second end of the base 1 is provided with a seal against which the valve disc 5 is urged by the spring assembly to effect sealed communication of the relief valve with the transformer tank.
The sealing member includes: the rubber ring 9 is attached to and arranged in a groove formed in the second end of the base 1; and the blank holder 10 is attached to the rubber ring 9. Be provided with the shoulder structure on the second end of base 1 to structural recess has been seted up at the shoulder, set up on the recess of shoulder structure through rubber circle 9, perhaps be provided with the bulge on the rubber circle 9, the bulge card is established on the recess, and pastes structurally at the shoulder, thereby guaranteed valve disc 5 with base 1 separation back, rubber circle 9 can not break away from the original position, has guaranteed the leakproofness when valve disc 5 and base 1 contact once more. The blank holder 10 that sets up guarantees that the rubber circle 9 stability after the extrusion warp, avoids producing irregular deformation or leads to rubber circle 9 to damage, influences the leakproofness of relief valve.
The supporting device comprises a plurality of stand columns 6, and the stand columns 6 are circumferentially distributed and connected on the base 1 and the top cover 3. A plurality of stands 6 that set up play the effect of support and connection, guarantee relief valve's stable in structure.
Two ends of each upright post 6 are respectively connected to the base 1 and the top cover 3 through screws. The release valve is detachably connected through screws, so that the release valve is not only favorable for assembling the release valve, but also capable of reducing the manufacturing cost through the assembling of each structural part, and convenient to detach and favorable for later-stage maintenance and repair.
A plurality of clamping grooves are arranged on the opposite side surfaces of the base 1 and the top cover 3 and used for accommodating the upright posts 6. The installation of being convenient for to can play certain limiting displacement, if wherein a small amount of screws drop, under the effect of several screws wherein, the distance of valve disc 5 and base 1 does not change, and each 6 both ends of stand all establish in the draw-in groove, consequently, the supporting role of stand 6 does not receive the influence.
The valve disc 5 has a disc-like structure, and the outer peripheral wall of the valve disc 5 is attached to each of the columns 6 and is slidable in the axial direction of each of the columns 6. Each stand 6 of setting plays direction and limiting displacement to valve disc 5, under the effect of spring unit and oil tank pressure for valve disc 5 can remove along the axial direction of stand 6, plays the guide effect, and, the even mode that sets up of 6 circumference of each stand plays to valve disc 5 spacing in week, avoids valve disc 5 to reset and contacts again and take place the dislocation problem on base 1, and then has avoided because the leakproofness problem that the dislocation leads to.
The spring assembly comprises a first spring 7 and a second spring 8, the diameter of the first spring 7 is smaller than that of the second spring 8, the second spring 8 is coaxially sleeved on the first spring 7, and two ends of the first spring 7 and two ends of the second spring 8 are respectively connected to the valve disc 5 and the top cover 3. The two springs are arranged to ensure the stability of the springs in the axial direction when the springs apply work. Displacement in a direction perpendicular to the axial direction of the spring is avoided, enhancing the stability of the movement between the spring assembly and the valve disc 5.
The cover shell comprises a plurality of protection plates 2, one side of each protection plate 2 is hinged to the top cover 3, and each protection plate 2 is attached to the base 1 through magnetic attraction. Specifically, the magnet 12 is installed to realize magnetic attraction. As will be appreciated by those skilled in the art, the connection means between each protection plate 2 and the base 1 includes, but is not limited to, magnetic attraction. The quantity that guard plate 2 can open under the effect of demand control pressure to through control magnetic attraction or spring tension, with the open mode of control under different pressure effects, can also fix guard plate 2 on base 1 through the screw connection.
In an alternative embodiment, a sliding groove (not shown in the figure) is further formed in the base 1, the length direction of the sliding groove is perpendicular to the protection plate 2, a spring is arranged in the sliding groove and connected with the protection plate 2, and the protection plate 2 can be tensioned on the base 1 through the spring.
Specifically, in an optional embodiment, one side of the protection plate 2 is rotatably connected to the upright post 6, the protection plate 2 is tensioned through a spring, when the internal pressure is greater than the spring tension, the protection plate 2 rotates around the upright post 6 to realize self-opening, and when the internal pressure is less than the spring tension, the protection plate 2 rotates to reset to realize automatic closing. It should be understood that each protection plate 2 is arranged in a sealing manner and will not be described in detail.
When the pressure in the transformer oil tank is too high and needs to be released, the air pressure is greater than the pressure of the spring assembly, the valve disc 5 is pushed open, the signal rod 4 extends out of the top cover 3, and the extending of the signal rod 4 can be used as an observation signal or a top contact signal trigger device to send a signal. When oil gas pressure in the relief valve is greater than magnetic attraction or spring tension, with each guard plate 2 backs down, realizes opening (refer to fig. 4) of guard plate 2 for pressure can be released, and when pressure in the relief valve was less than magnetic attraction or spring tension, guard plate 2 can laminate again on base 1. It will be appreciated that when the pressure within the transformer tank is less than the release pressure of the spring assembly, the spring assembly will release energy urging the valve disc 5 against the second end of the base 1.
In this embodiment, each of the protection plates 2 is hinged to the top cover 3 by a spring hinge, and sealing strips are provided on the sides of the protection plates 2 facing the valve disc 5 and the top cover 3 to prevent the intrusion of sealing rain and snow, so as to keep the interior of the relief valve clean. When guard plate 2 open mode, the spring hinge can store energy to can drive guard plate 2 and close, it is specific, can select the different spring hinges of torsion according to actual service environment.
In this embodiment, the cover casing is polygonal, and a plurality of protection plates 2 which can be opened symmetrically are arranged on the cover casing. The stability of the housing is ensured while the pressure relief is enhanced. As will be appreciated by those skilled in the art, the housing is made of stainless steel that is corrosion resistant, weather resistant, and strong enough, or a high analysis material that is resistant to three-proofing, thereby providing greater valve body protection. The application provides a pressure release valve for power transformer can open when pressure release valve opens, and the housing can open automatically, and the increase area of releasing of opening of housing has strengthened pressure release ability, has greatly reduced housing water conservancy diversion resistance for the inside overstock of release valve reduces by a wide margin, has improved the security and the job stabilization nature of pressure release valve body, and the housing can self-closing, can prevent to seal the invasion of killing sleet, in order to keep the inside cleanness of release valve.
In a second aspect, there is provided an electrical transformer, to which the pressure relief valve for an electrical transformer as described above is applied.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (12)
1. A pressure relief valve for an electrical transformer, comprising:
the transformer oil tank is provided with a through hole, and the first end of the base can be communicated with the transformer oil tank;
a support device disposed on the base,
a valve disc sealingly disposed on the second end of the base;
the top cover is arranged on one side of the supporting device, which is far away from the base;
a spring assembly disposed between the valve disc and the top cap;
the first end of the indicating rod is fixed on the valve disc, and the second end of the indicating rod can penetrate out of the top cover;
and a cover disposed between the base and the top cover for closing the base and the top cover, the cover being openable under internal pressure.
2. The pressure relief valve for an electrical transformer of claim 1 wherein said base first end is provided with a connecting flange, said connecting flange capable of sealing communication with said transformer tank.
3. The pressure relief valve for an electrical transformer as recited in claim 1 wherein said second end of said base member is provided with a seal against which said valve disc is urged by said spring assembly;
the seal includes:
the rubber ring is attached to and arranged in a groove formed in the second end of the base;
and the blank holder is attached to the rubber ring.
4. The pressure relief valve for an electrical transformer as recited in claim 1 wherein said support means comprises a plurality of posts, said plurality of posts being circumferentially distributed and connected to said base and said top cover.
5. The pressure relief valve for an electrical power transformer of claim 4, wherein both ends of each of said posts are respectively screwed to said base and said top cover.
6. A pressure relief valve for an electrical power transformer according to claim 4 or 5, wherein said base and said top cover are provided with a plurality of notches on opposite sides thereof for receiving each of said posts.
7. The pressure relief valve for an electrical power transformer as recited in claim 1 wherein said valve disc is a disc-like structure,
the peripheral wall of the valve disc is attached to each upright column and can slide along the axial direction of each upright column.
8. The pressure relief valve for an electrical transformer of claim 1, wherein said spring assembly comprises a first spring and a second spring, said first spring having a smaller diameter than said second spring, said second spring coaxially fitting over said first spring, both ends of said first spring and said second spring being connected to said valve disc and said top cover, respectively.
9. The pressure relief valve for an electrical transformer as recited in claim 1 wherein said housing comprises a plurality of shield plates, one side of each of said shield plates being hinged to said top cover, each of said shield plates being magnetically attached to said base.
10. The pressure relief valve for an electrical transformer as recited in claim 9 wherein each of said shield plates is hingedly connected to said top cover by a spring hinge and a seal is provided on the side of said shield plates facing said valve plate and said top cover.
11. The pressure relief valve for an electrical transformer as recited in claim 9 wherein said housing is polygonal and said housing is provided with a plurality of said plates which are symmetrically openable.
12. A power transformer, characterized in that a pressure relief valve for a power transformer according to any one of claims 1-11 is applied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111521445.0A CN115306930A (en) | 2021-12-13 | 2021-12-13 | Pressure relief valve for power transformer and power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111521445.0A CN115306930A (en) | 2021-12-13 | 2021-12-13 | Pressure relief valve for power transformer and power transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115306930A true CN115306930A (en) | 2022-11-08 |
Family
ID=83853105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111521445.0A Pending CN115306930A (en) | 2021-12-13 | 2021-12-13 | Pressure relief valve for power transformer and power transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115306930A (en) |
-
2021
- 2021-12-13 CN CN202111521445.0A patent/CN115306930A/en active Pending
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