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CN-224229720-U - Drain valve

CN224229720UCN 224229720 UCN224229720 UCN 224229720UCN-224229720-U

Abstract

The utility model relates to a drain valve, which comprises a valve body, wherein a valve seat is arranged in the valve body, a cage sleeve is arranged on the valve seat, an orifice is arranged on the cage sleeve, a protective sleeve is arranged in the cage sleeve, a valve clack is arranged in the protective sleeve, a driving sleeve is arranged on the protective sleeve, a first valve rod is arranged in the driving sleeve, a second valve rod is arranged on the top end of the first valve rod, a first wing plate is arranged on the driving sleeve, a second wing plate is arranged on the second valve rod above the first wing plate, a plurality of regulating screws which are distributed outside the central axis of the second valve rod in a star shape are arranged on the second wing plate and the first wing plate, and a first nut, a spring, a first backing ring and a second nut are respectively arranged on the regulating screws. The cavitation phenomenon of the valve clack of the drain valve, which occurs when the valve clack of the drain valve is in an open state, can be reduced. The utility model is convenient to use and has wide market prospect.

Inventors

  • WANG QINGHE
  • WANG QINGQING
  • WEI CHAO

Assignees

  • 开封高中压阀门有限公司
  • 开封东立高压阀门铸造有限公司

Dates

Publication Date
20260512
Application Date
20250715

Claims (6)

  1. 1. A drain valve is characterized by comprising a valve body (1), a valve seat (2) is arranged in the valve body (1), a cage sleeve (3) is arranged on the valve seat (2), an orifice (4) is arranged on the cage sleeve (3), a protective sleeve (5) is arranged in the cage sleeve (3), a valve clack (6) is arranged in the protective sleeve (5), the valve clack (6) and the protective sleeve (5) are attached to the valve seat (2), a driving sleeve (7) is arranged on the protective sleeve (5), a first valve rod (8) is arranged in the driving sleeve (7), the bottom end of the first valve rod (8) is connected with the valve clack (6), a second valve rod (9) is arranged on the top end of the first valve rod (8), a first wing plate (10) is arranged on the driving sleeve (7), a second wing plate (11) is arranged on the second valve rod (9) above the first wing plate (10), a plurality of adjusting screw rods (12) are arranged on the second wing plate (11) and the first wing plate (10), the number of the adjusting screw rods (12) is equal to a plurality of the adjusting screw rods (12) which are distributed on the outer sides of the second wing plate (9) respectively, the second wing plates (11) are far away from the adjusting screw rods (12) on one side of the first wing plates (10), and springs (14), first backing rings (15) and second nuts (16) are respectively arranged along the directions from the second wing plates (11) to the second wing plates (11).
  2. 2. The drain valve according to claim 1, wherein the first valve rod (8) and the second valve rod (9) are of round rod-shaped structures, the driving sleeve (7) is of a round tube-shaped structure, the central axis of the second valve rod (9), the central axis of the first valve rod (8) and the central axis of the driving sleeve (7) are located on the same axis, the diameter of the second valve rod (9) is not larger than that of the first valve rod (8), the second valve rod (9) is sleeved with a first sealing filler (17), a first filler pressing sleeve (18) is arranged on the second valve rod (9) on one side, far from the first valve rod (8), of the first sealing filler (17), the first filler pressing sleeve (18) is in threaded connection with the second valve rod (9), and the bottoms of the first sealing filler (17) and the first filler pressing sleeve (18) are located in the driving sleeve (7).
  3. 3. The drain valve according to claim 2, wherein a driving block (19) is arranged on the first packing pressing sleeve (18) above the driving sleeve (7), the driving block (19) adopts a polygonal prism-shaped tubular structure, and the inner wall of the driving pipe () is connected with the outer wall of the first packing pressing sleeve (18).
  4. 4. The drain valve according to claim 1, wherein the number of the throttle holes (4) is a plurality, and the throttle holes (4) are spirally distributed on the cage (3).
  5. 5. The drain valve of claim 1, wherein the bottom end of the driving sleeve (7) is located in the inner cavity of the protecting sleeve (5), the protecting sleeve (5) adopts a circular tube-shaped structure, the upper part of the valve clack (6) adopts a convex structure formed by a small head end and a big head end arranged below the small head end, the small head end of the upper part of the valve clack (6) is located in the inner cavity of the driving sleeve (7), the big head end of the upper part of the valve clack (6) is located in the protecting sleeve (5), and a movable gap is arranged between the big head end of the upper part of the valve clack (6) and the driving sleeve (7).
  6. 6. The drain valve of claim 1, wherein a cage pressing ring (20), a second backing ring (21), a second sealing filler (22) and a second filler pressing sleeve (23) are sequentially arranged in the valve body (1) above the cage (3) along the direction from the cage (3) to the direction away from the cage (3), the cage pressing ring (20), the second backing ring (21), the second sealing filler (22) and the second filler pressing sleeve (23) are sleeved on the driving sleeve (7), a filler pressing plate (24) is arranged on the driving sleeve (7) above the second filler pressing sleeve (23), adjusting bolts (25) are arranged on the filler pressing plate (24) and the valve body (1), and the adjusting bolts (25) are distributed on the outer side of the central axis of the driving sleeve (7) in a star shape.

Description

Drain valve Technical Field The utility model relates to the field of drainage equipment, in particular to a drainage valve. Background The power plant drainage system is divided into two parts of thermodynamic equipment drainage and steam pipeline drainage, the thermodynamic equipment drainage system mainly comprises a boiler body drainage system, a steam turbine body drainage system, a heater drainage system and the like, the steam pipeline drainage system mainly comprises main steam, reheat steam, bypass steam, extraction steam and auxiliary steam pipeline drainage systems. The high-pressure accident drainage and other high-pressure drainage of most power plants are connected into the knapsack type high-pressure body drainage expansion tank. Because the high-pressure accident has large water-repellent capacity, high temperature and pressure, the back of the water-repellent valve is in a steam-water two-phase flow, the medium flow speed is high, the medium of the water-repellent control valve is saturated water, cavitation is easy to occur, and the flash evaporation phenomenon is frequent in general cases. The high-pressure normal drainage is a step-by-step drainage mode, the load of each level of high-pressure operation pressure random group is increased to increase, and the pressure of each level of water delivery is reduced along with the pressure reduction after the valve. The phenomenon that a small amount of gaseous medium in the steam-water two-phase flow throttled by a throttling device in a drain valve directly impacts a sealing surface of a valve clack to do work, wherein a small amount of the gaseous medium is liquefied and vaporized is called flash evaporation, and the flash evaporation phenomenon frequently occurs on the sealing surface of the valve clack, so that cavitation can occur on the sealing surface of the valve clack to damage the sealing surface of the valve clack, and the valve clack is closed on a valve seat and excessively attached to the valve seat, so that leakage does not occur. Therefore, the prior art has room for improvement, reduces the occurrence of cavitation phenomenon when the valve clack of the drain valve is opened, and further improves the durability of the valve clack of the drain valve, thereby reducing the maintenance frequency of the drain valve and improving the market popularization of the corresponding drain valve. Disclosure of Invention Aiming at the defects of the prior art, the utility model provides the drain valve which can reduce the cavitation phenomenon of the valve clack of the drain valve when the valve clack of the drain valve is in an open state, and is used for overcoming the defects in the prior art. The drain valve comprises a valve body, wherein a valve seat is arranged in the valve body, a cage sleeve is arranged on the valve seat, orifices are arranged on the cage sleeve, a protective sleeve is arranged in the cage sleeve, a valve clack is arranged in the protective sleeve, the valve clack and the protective sleeve are respectively attached to the valve seat, a driving sleeve is arranged on the protective sleeve, a first valve rod is arranged in the driving sleeve, the bottom end of the first valve rod is connected with the valve clack, a second valve rod is arranged on the top end of the first valve rod, a first wing plate is arranged on the driving sleeve, a second wing plate is arranged on the second valve rod above the first wing plate, a plurality of adjusting screws are uniformly distributed on the outer side of the central axis of the second valve rod in a star shape, and a plurality of adjusting screws on two sides of the second wing plate are respectively provided with a first nut, and a plurality of springs, a first backing ring and a second nut are respectively arranged on the second wing plate along the direction from the second wing plate to the second wing plate. Preferably, the first valve rod and the second valve rod all adopt round rod-shaped structure, the driving sleeve adopts round tube-shaped structure, the axis of the second valve rod, the axis of the first valve rod and the axis of the driving sleeve are located on the same axis, the diameter of the second valve rod is not greater than that of the first valve rod, the second valve rod is sleeved with first sealing filler, the second valve rod far away from one side of the first valve rod is provided with a first filler pressing sleeve, the first filler pressing sleeve is in threaded connection with the second valve rod, and the bottoms of the first sealing filler and the first filler pressing sleeve are located in the driving sleeve. Preferably, a driving block is arranged on the first packing pressing sleeve above the driving sleeve, the driving block adopts a polygonal prism-shaped tubular structure, and the inner wall of the driving pipe is connected with the outer wall of the first packing pressing sleeve. Preferably, the number of the throttle holes is a pluralit