CN2254980Y - Valve for pressure releasing for transformer - Google Patents

Abstract

The utility model discloses a valve for releasing pressure for a transformer, and relates to a protective device for regulating pressures inside a transformer. The utility model is composed of a sleeve barrel, springs, a sign rod, etc. A quadrate valve seat (16) is connected with a nut (17) through screw threads, and the axial end surface of the upper part of the valve seat is lined with a toothed seal ring (3). A membranous disc (15) with radial reinforcing ribs, and a guide regulating screw (8) are connected with the sleeve barrel (5) through internal screw threads, and a flaring protective cover (14) is covered outside the sleeve barrel (5). When pressure in an oil tank of a transformer reaches definite limit, oil fluid can be released automatically. The valve has the advantages of compact structure, convenient installation, stable and reliable performance, etc., and is an important component for various transformers.

Description

A kind of transformer pressure relief valve

The utility model relates to a kind of protective gear that is used to regulate the transformer internal pressure.

At present, the domestic and international transformer pressure relief valve of producing, exist shortcomings such as volume is big, installation inconvenience, unstable properties, publication number is CN2081021U, a kind of utility model patent of transformer pressure relief valve is disclosed, its main structure and principle are: the transformer pressure relief valve is made up of housing, spring, depression bar etc., its pressure leak process changes air gate type into by piston type, seal ring changes newborn taper into by the O type, and change two seals into by sealing together, when the oil tank of transformer internal pressure reaches certain limit, can discharge fluid automatically.But because that most of transformers are placed in is outdoor, especially at cold freezing weather, dust, rainwater can not discharge when the oil tank of transformer internal pressure reaches certain limit automatically in that the plug cover and the seam of housing seat are freezed; In addition,, make plug cover stressed concentrating and cause the distortion of plug cover, thereby influence the sealability between plug cover and the housing seat, so just can not guarantee the stability and the reliability of pressure relief valve because the surface of contact of depression bar and spring and plug cover is limited.Moreover the stepped shape housing lid has increased the volume of pressure relief valve, and the cylindrical housings seat is installed also inconvenient.

The purpose of this utility model provides a kind of transformer pressure relief valve, makes it stable performance, and volume is little, and is easy for installation.

The technical solution of the utility model is design like this: the housing seat that will be connected with transformer is designed to square valve seat, the axial end on square valve seat top is lined with the zigzag fashion seal ring, the plug cover changes the membranous disc of band radial distribution stiffening rib into, step-like housing lid changes the guiding adjusting screw into, and the outside of sleeve is covered with a tubaeform protective housing.

The utility model is owing to adopted above-mentioned solution, square valve seat middle part is the polygonal boss axially, guiding adjusting screw upper-end surface axially is evenly distributed with blind hole, radially have circular hole, and make steel ball play self-locking action by conical Cock screw, thereby the transformer pressure relief valve that the utility model is provided has compact structure, easy for installation, stable performance, advantage such as reliable.

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail:

Fig. 1 is the structural representation of transformer pressure relief valve;

Fig. 2 is the plan structure schematic representation of membranous disc.

Nut (17) links to each other with the pouring orifice of transformer case lid, the axial end that nut (17) is connected with square valve seat (16) is lined with seal ring (1), the two ends of square valve seat (16) are outside thread, the middle part is the polygonal boss axially, be convenient to and being connected and fixed of nut (17), for reducing the external diameter of square valve seat (16), be preferably equilateral Octagon boss, the axial end on square valve seat (16) top is lined with sawtooth pattern seal ring (3).Because membranous disc (15) contacts for shearing shape with the seal ring (2) of square valve seat (16) circumferential end surfaces, so square valve seat circumferential end surfaces lining is with O RunddichtringO (2).Sleeve (5) lower end is threaded with square valve seat (16), realizes axially locating, and its upper internal threaded connects a guiding adjusting screw (8).The upper-end surface of guiding adjusting screw (8) axially is evenly distributed with blind hole, so that the pressure of twisting guiding adjusting screw (8) Regulation spring (4).Locate after being adjusted to authorized pressure for making guiding adjusting screw (8), guiding adjusting screw (8) radially have a circular hole, lay steel ball (6) in the circular hole, be connected with circular hole radially, axially have screw, rotational circle taper Cock screw (7), the conical surface of Cock screw promote steel ball and contact with sleeve (5), make guiding adjusting screw (8) locking, thereby guarantee that the pressure of being regulated is reliable.The membranous disc (15) of band radial distribution stiffening rib covers on the square valve seat (16), the marker post (9) that is with spring (4) is pressed on the membranous disc (15), guiding adjusting screw (8) pressure spring (4), the pressure of its generation compresses membranous disc (15) and seal ring (2), (3) on the square valve seat, plays the seal action between membranous disc and the square valve seat.When the transformer internal pressure reaches certain limit, fluid in the fuel tank is promptly washed membranous disc (15) open, discharge from the slit between membranous disc and seal ring (2), (3), radial direction through hole through sleeve (5) bottom flows out, membranous disc automatically resets under the effect of spring (4) subsequently, waterproof ring (10) is enclosed within the top of marker post (13), and sign cap (9) is threaded with marker post (13).Tubaeform protective housing (14) is fastened on the sleeve (5) with packing ring (12), screw (13), protective housing (14) can avoid most of dust, rainwater to gather membranous disc (15) and valve seat (16) seam mouth, at freezing weather the seam mouth is frozen, thereby improved the reliability of relief valve, in addition, in the transformer pressure leak process, protective housing can make the fluid release of effectively being led, and is convenient to that the workman safeguards, the maintenance transformer.

Claims (6)

1, a kind of transformer pressure relief valve, comprise nut (17), seal ring (1), (2), waterproof ring (10), spring (4), marker post (13), sign cap (9), nut (17) is connected with valve seat (16) by internal thread, marker post (13) top is an outside thread, the sign cap thread is connected the marker post top, spring (4) is enclosed within on the marker post (13), the bottom of coupling sleeve (5) radially has through hole, it is characterized in that: a square valve seat (16) that is threaded with nut (17) is arranged, the axial end on square valve seat (16) top is lined with zigzag fashion seal ring (3), be stamped the membranous disc (15) of a band radial distribution stiffening rib above the square valve seat (16), sleeve (5) upper internal threaded connects a guiding adjusting screw (8), sleeve (5) lower end is threaded with square valve seat (16), and the outside of sleeve (5) is covered with a tubaeform protective housing (14).

2, a kind of transformer pressure relief valve according to claim 1, the two ends that it is characterized in that square valve seat (16) are outside thread, the middle part axially is the polygonal boss.

3, a kind of transformer pressure relief valve according to claim 2 is characterized in that square valve seat (16) middle part axially is equilateral Octagon boss.

4, a kind of transformer pressure relief valve according to claim 1, the upper-end surface of the adjusting screw (8) that it is characterized in that leading axially is evenly distributed with blind hole.

5, a kind of transformer pressure relief valve according to claim 1, the adjusting screw (8) that it is characterized in that leading radially has the circular hole that can lay steel ball, and being connected with circular hole radially axially has screw.

6, a kind of transformer pressure relief valve according to claim 5 has been laid the steel ball (6) of self-locking action in the radially circular hole of the adjusting screw (8) that it is characterized in that leading, axially screw is rotary with conical Cock screw (7).