Electrical distribution transformer having pressure relief means
阅读：249发布：2022-04-30
专利汇可以提供Electrical distribution transformer having pressure relief means专利检索，专利查询，专利分析的服务。并且High internal pressure within a distribution transformer casing caused by an incipient fault or thermal overload is a hazard to the lineman, and the transformer is provided with a pressure relief valve which opens automatically to limit the total pressure rise within the casing or may be actuated manually by the lineman to vent the casing even though the internal pressure is below the operating level of the relief device. A die cast plug alternatively may be used to seal the transformer casing or may be formed in a simple machining operation into the pressure relief device valve body with an integral valve seat and an integral valve stem guide.，下面是Electrical distribution transformer having pressure relief means专利的具体信息内容。
1. In combination, an electrical distribution transformer having a casting, a cooling dielectric fluid within said casing, a transformer core and coil assembly immersed in said fluid within said casing, a pressure relief Valve extending through a wall of said casing and communicating with the interior of said casing above said dielectric fluid and normally being closed and being operable to open position in response to a first predetermined magnitude of internal pressure within said casing to vent the interior of said casing and release sufficient gas to the atmosphere to limit total pressure rise within the casing in the event of a transformer fault and to reclose and reseal said casing when said internal pressure drops to a second predetermined magnitude which is below said first predetermined magnitude, and handle means accessible from the exterior of said casing for manually operating said valve to vent the interior of said casing to the atmosphere.
2. In the combination of claim 1 wherein said transformer has hanger bracket means affixed to a sidewall of said casing for mounting said transformer on a pole and said pressure relief valve extends through said sidewall in the vicinity of said hanger bracket means and a handle is associated with said pressure relief valve for manually opening said valve to open position to vent the interior of said casing to the atmosphere and said handle is mounted to be accessible from the exterior of said casing to a lineman on said pole.
3. In the combination of claim 2 wherein said pressure relief valve includes an elongated cylindrical valve body extending through an aperture in said casing wall and having an axial opening therethrough of sufficiently large cross section to limit total pressure rise within said casing in the event of a transformer fault and an annular surface defining a valve seat, an elongated valve stem reciprocable longitudinally within said axial opening and having a radial extending valve head, and spring means for biasing said valve stem in a longitudinal direction to normally urge said valve head against said valve seat, and wherein said handle is affixed to said valve stem and permits manual actuation of said valve stem in a longitudinal direction to lift said valve head off said valve seat.
4. In the combination of claim 3 wherein said valve body has a spring retainer extending radially across said axial opening and being integral and of one piece with said valve body and having a guide aperture axial of said valve body slidably receiving said valve stem, and wherein said spring means is a cylindrical spring surrounding said valve stem and abutting at one end against said spring retainer.
5. In the combination of claim 4 wherein said spring retainer includes an annular portion of smaller diameter than said axial opening and a plurality of arcuately spaced apart radial arms each of which is integral and of one piece at one end with said annular portion and is integral and of one piece at the other end with said valve body, and the opening in said annular portion forms said guide aperture for said valve stem.
6. In the combination of claim 5 wherein said valve body has a conical surface defining said valve seat and partially defining said axial opening, said valve head has a conical circumferential surface complementary to said valve seat and a circumferential groove in said circumferential surface, and said pressure relief valve also includes a resilient annular gasket disposed within said circumferential groove and compressed against said valve seat by said spring means when said valve is closed.
7. In the combination of claim 6 wherein said valve head is on the outer end of said valve stem, said valve stem has radially extending spring compressing means adjacent its inner end, and said cylindrical spring is a compression spring abutting at its opposite ends against said annular portion of said spring retainer and said radial extending means on said inner end of said valve stem respectively.
8. In the combination of claim 4 wherein said valve body is die cast and has a conical compartment at its inner end partially defining said axial opening and said spring retainer portion is within said axial opening at the naRrower end of said conical compartment and comprises a plurality of arcuately spaced radial extending arms integral with said valve body terminating at the radially inner end in an annular portion which defines said guide aperture for said valve stem, and said pressure relief valve also includes a cylindrical compression spring surrounding said valve stem and seated at one end against said spring retainer portion.
9. In the combination of claim 1 wherein said transformer has hanger bracket means affixed to a sidewall of said casing for mounting said transformer on a pole and said pressure relief valve includes a valve body protruding through an aperture in said casing sidewall in the vicinity of said hanger bracket means and having an opening therethrough of sufficiently large cross section to limit total pressure rise within the casing in the event of a transformer fault, a movable valve member reciprocable within said opening between an open position wherein the interior of said casing is vented to the atmosphere and a closed position wherein said movable valve member seals said opening, resilient means for urging said movable valve member to said closed position, said handle means being affixed to said movable valve member and being accessible from the exterior of said casing to a lineman on said pole for manually actuating said movable valve member to said open position to vent the interior of said casing.
10. In the combination of claim 1 wherein said pressure relief valve includes a valve body protruding through an aperture in said casing wall and having an opening therethrough of sufficiently large cross section to limit total pressure rise within said casing in the event of a transformer fault, a movable valve member reciprocable within said opening between an open position wherein the interior of said casing is vented to the atmosphere and a closed position wherein said movable valve member seals said opening, resilient means for urging said movable valve member to said closed position, said handle means being affixed to said movable valve member and being accessible from the exterior of said casing for manually actuating said movable valve member to said open position to vent the interior of said casing.
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