CN2823733Y

CN2823733Y - Pressure regulating steam safety valve

Info

Publication number: CN2823733Y
Application number: CN 200520045280
Authority: CN
Inventors: 吴培君
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-09-22
Filing date: 2005-09-22
Publication date: 2006-10-04
Anticipated expiration: 2015-09-22

Abstract

The utility model discloses a product of a pressure regulating steam safety valve, which overcomes the deficiency and defect of instable air pressure for pressure relief the product in the prior art. The utility model comprises a valve casing and a valve body, wherein a clutch piece is arranged at the top of the valve body. Both the shape of the inner cross section of the clutch piece and the upper end of the valve body and the shape of the outer cross section of the clutch piece and the inner cross section of the upper end of the valve casing are matched. A clutch spring is arranged between the upper end of the clutch piece and the top end of an inner cavity of the valve casing. A tubular steam driven piston is arranged on the upper end of the inner cavity of the valve body. The bottom of the steam driven piston is necked by a flange, the perisporium of the steam driven piston is provided with at least one discharge steam hole, and exhaust steam holes are arranged on the perisporium of the valve body corresponding to the discharge steam holes. A pressure adjusting top rod is arranged in the inner cavity of the steam driven piston, the top of the pressure adjusting top rod is butted to the clutch piece, and the under part is connected with a pressure relief valve stem by a pressure relief spring. The bottom of the pressure relief valve stem is embedded with a sealing gasket which is butted to the necking flange at the bottom of the steam driven piston. Compared with the prior art, the utility model has the advantages of more stable air pressure for pressure relief, higher sensitive part and more reasonable inner structure.

Description

The pressure regulating type steam security valve

Technical field

The utility model relates to a kind of manufacturing technology field that is installed on Safety valve on steam raising plant or the steam boiler, especially refers to the overload pressure relief device of safety valve.

Background technique

Common steam raising plant or steam boiler often connects a steam security valve at water filling hole at present, and this steam security valve had both played the seal action of common cover, plays the security insurance effect of overload automatic pressure-relieving again.After liquid water was heated a period of time, along with the generation of water vapor, clutch piece in the steam security valve and valve body upper end broke away from, and whole valve body can't screw off from boiler, has effectively eliminated the water vapor ejection and the potential safety hazard of scald human body.The comparatively typical product such as the day for announcing are on September 22nd, 2004, publication number is CN2643105Y, name is called the utility model patent of " steam safety valve ", disclose " a kind of simple in structure; as to make easy to process; as can to prevent the steam security valve of steam scald human body; comprise valve casing and valve body; the valve body top of valve shell cavity is provided with and can rotates synchronously; the clutch piece that moves up and down, valve body is built-in with spool moving up and down, in the spool from down and on establish sealing cup successively, piston and piston rod, it is inverted bowl-shape that described sealing cup is, the terminal interlocking of described valve body threaded coupling has pressure pad, establish seal ring in the pressure pad, described spool underpart is established annular groove and is embedded with seal ring, and described piston and piston rod adopt and divide body structure." but through the scrutinizing of applicant; find that this utility model patent technical products also has further improvements; mainly show as: after the paranormal working pressure of vapor pressure; spool need overcome making a concerted effort of release and two springs of clutch and on move; steam just is able to from pressure release passage discharge, thereby guarantees that vapor pressure works under specified safety pressure all the time.Therefore, the release air pressure of this product depends on making a concerted effort after two springs stacks of release and clutch, and release air pressure is stable inadequately.For this reason, people expect to invent more reasonably pressure regulating type steam security valve of a kind of release stable gas pressure, structure, to overcome deficiency and the defective that prior art exists.

The model utility content

The technical problems to be solved in the utility model provides more reasonably pressure regulating type steam security valve product of a kind of release stable gas pressure, structure, depends on making a concerted effort and stable inadequately deficiency and the defective of release air pressure that cause after release and two springs stacks of clutch to overcome release air pressure that prior art exists.

The technological scheme that its technical problem that solves the utility model adopts is: the pressure regulating type steam security valve comprises valve casing and valve body, the valve body top is provided with clutch piece, sectional shape and valve body upper end, the interior sectional shape of outer sectional shape of clutch piece and valve casing upper end all are complementary in the described clutch piece, be provided with the clutch spring between clutch piece upper end and the valve shell cavity top, described body cavity upper end is provided with the steam-operating piston of tubulose, described steam-operating piston base is with the flange reducing, its perisporium also is provided with one at least and unloads steam vent, is provided with exhaust hole corresponding to the valve body perisporium that unloads steam vent; The steam-operating piston cavity is provided with the pressure regulation push rod, and described pressure regulation push rod top is butted on clutch piece, and the below is connected with the release valve rod through back lash spring, and the bottom of described release valve rod is embedded with sealing gasket, and described sealing gasket is butted on the flange reducing of steam-operating piston base.

The inner chamber of described steam-operating piston adopts with the pressure regulation push rod and is threaded.

Described steam-operating piston is embedded with seal ring at the outer wall a little more than flange reducing place.

The utility model pressure regulating type steam security valve product, when producing vapor pressure, clutch piece is ejected and breaks away from engagement with the valve body upper end, and terminates in the valve shell cavity top, so its release air pressure only depends on the elastic force of back lash spring.Compare than prior art, the release air pressure of this product is more stable, and rod meter is higher, and it is reasonable that internal structure more becomes.

Description of drawings

Fig. 1 is the structural representation under the utility model product normal pressure.

Fig. 2 is the structural representation of the utility model product under rated working pressure.

Fig. 3 is the structural representation of the utility model product when the release exhaust.

Embodiment

Shown in Fig. 1,2 and 3, the utility model pressure regulating type steam security valve comprises valve casing 1 and valve body 9, and valve casing 1 is connected in valve body 9 by gland 11 and makes longitudinal register.Valve body 9 tops are provided with clutch piece 2, in the described clutch piece 2 outside sectional shapes and valve body 9 upper ends sectional shape be complementary, can adopt polygonal, a kind of as regular pentagon, regular hexagon or octagon.Sectional shape is complementary in clutch piece 2 outer sectional shapes and valve casing 1 upper end, also can adopt polygonal, a kind of as regular pentagon, regular hexagon or octagon.After adopting such Placement, valve casing 1 and clutch piece 2, clutch piece 2 and valve body 9 tops all keep synchronous rotation, coupled condition movably up and down.Be provided with clutch spring 10 between clutch piece 2 upper ends and the valve casing 1 inner chamber top.Valve body 9 inner chamber top movable are combined with the steam-operating piston 8 of tubulose, described steam-operating piston 8 bottoms are with flange 16 reducings, outer wall a little more than flange 16 reducings place is embedded with seal ring 6, to prevent that steam is from the slot leakage between steam-operating piston 8 outer walls and valve body 9 inwalls.The perisporium of steam-operating piston 8 also is provided with one at least and unloads steam vent 12, and valve body 9 perisporiums that unload steam vent 12 corresponding to steam-operating piston 8 are provided with exhaust hole 13.The inner chamber top of steam-operating piston 8 is provided with screw thread and is connected with pressure regulation push rod 3, described pressure regulation push rod 3 tops are butted on clutch piece 2, the below is connected with release valve rod 5 through back lash spring 4, and the bottom of release valve rod 5 is embedded with sealing gasket 7, and sealing gasket 7 is butted on flange 16 reducings place of steam-operating piston 8 bottoms.Valve body 9 lower ends establish the outside thread interface be used for water filling hole between be connected, the outside thread root is provided with back-up ring 14 and seal ring 15, is used for the sealing between the utility model product and the steam raising plant water filling hole.

As shown in Figure 1, clutch piece 2 is subjected to 10 effects of clutch spring and meshes in valve body 9 upper ends, and makes steam-operating piston 8 bottoms be butted on valve body 9 middle benches 17 through pressure regulation push rod 3.Release valve rod 5 in steam-operating piston 8 inner chambers is subjected to back lash spring 4 effects to make sealing gasket 7 be close to steam-operating piston 8 base flange 16, keeps sealing.The rotatable pressure regulation push rod 3 of user is regulated its position in steam-operating piston 8 inner chambers, to regulate the elastic force of back lash spring 4, reaches the purpose of regulating rated working pressure.

Continue in conjunction with the accompanying drawings below, narrate working principle of the present utility model.As shown in Figure 2, when the water in the steam raising plant came to life the generation vapor pressure, sealing gasket 7 bottoms were subjected to the vapor pressure effect, promoted pressure regulation push rods 3 through back lash spring 4 and rose, clutch piece 2 is ejected engagement with valve body 9 upper end profiles, and terminate in top of chamber in the valve casing 1.At this moment, no matter still be rotated counterclockwise valve casing 1 clockwise, can only drive clutch piece 2 idle running, and can not drive valve body 9 rotations, steam security valve can't screw off, thereby can eliminate the potential safety hazard that steam is scalded human body.

As shown in Figure 3, along with the continuation of vapor pressure is risen, the upward force F that produces when vapor pressure begin greater than back lash spring 4 to down spring the time, sealing gasket 7 breaks away from the sealing with steam-operating piston 8 base flange 16, and together with 5 risings of release valve rod, steam unloads steam vent 12,13 discharges of valve body 9 exhaust holes through steam-operating piston 8, and vapor pressure is kept balance, thereby the vapor pressure that guarantees whole device is worked under specified safety pressure all the time.

When vapor pressure descends, back lash spring 4 resiliences, sealing gasket 7 fits in steam-operating piston 8 base flange 16 again, and safety valve is back to normal working.When vapor pressure further descends and be lower than clutch spring 10 elastic force, behind the turn valve casing 1, clutch piece 2 is subjected to 10 effects of clutch spring to keep engagement with valve body 9 upper end profiles again, and torsion passes to valve body 9 through clutch piece 2, and the threaded coupling of valve body 9 lower ends can be connected with steam raising plant or unload.

Claims

1, a kind of pressure regulating type steam security valve, comprise valve casing (1) and valve body (9), valve body (9) top is provided with clutch piece (2), interior sectional shape of described clutch piece (2) and valve body (9) upper end, sectional shape all is complementary in outer sectional shape of clutch piece (2) and valve casing (1) upper end, be provided with clutch spring (10) between clutch piece (2) upper end and valve casing (1) the inner chamber top, it is characterized in that: described valve body (9) inner chamber upper end is provided with the steam-operating piston (8) of tubulose, described steam-operating piston (8) bottom is with flange (16) reducing, its perisporium also is provided with one at least and unloads steam vent (12), is provided with exhaust hole (13) corresponding to the valve body that unloads steam vent (12) (9) perisporium; Steam-operating piston (8) inner chamber is provided with pressure regulation push rod (3), described pressure regulation push rod (3) top is butted on clutch piece (2), the below is connected with release valve rod (5) through back lash spring (4), the bottom of described release valve rod (5) is embedded with sealing gasket (7), and described sealing gasket (7) is butted on flange (16) reducing of steam-operating piston (8) bottom.

2, pressure regulating type steam security valve as claimed in claim 1 is characterized in that: the inner chamber of described steam-operating piston (8) adopts with pressure regulation push rod (3) and is threaded.

3, pressure regulating type steam security valve as claimed in claim 1 or 2 is characterized in that: described steam-operating piston (8) is embedded with seal ring (6) at the outer wall of locating a little more than flange reducing (16).