CN201401776Y

CN201401776Y - Drum spherical head

Info

Publication number: CN201401776Y
Application number: CN2009200404546U
Authority: CN
Inventors: 过奇立; 魏利岩; 左彩霞; 马红; 姚梅初
Original assignee: Wuxi Huaguang Boiler Co Ltd
Current assignee: Wuxi Huaguang Boiler Co Ltd
Priority date: 2009-04-23
Filing date: 2009-04-23
Publication date: 2010-02-10
Anticipated expiration: 2019-04-23

Abstract

The utility model provides a drum spherical head. The thickness of a sealing surface of the head reaches up to over 80% of the using thickness of the head, and the strength margin of the head is enhanced. The drum spherical head comprises a spherical head and a manhole, wherein the manhole is arranged at the top end of the spherical head. The drum spherical head is characterized in that the top end of the spherical head is a plane, and the inner wall corresponding to the top end of the spherical head is a plane.

Description

A kind of drum spherical sealing

(1) technical field

The utility model relates to the boiler drum technical field of structures, is specially a kind of drum spherical sealing.

(2) background technology

Existing drum spherical sealing is seen Fig. 1, and it is by opening manhole 2, welding stiffening ring 3 on whole hemispherical head 1 top, and it need scrape out-of-plane could weld stiffening ring 3, need process a plane as manhole cover sealing surface 4 at the end socket inwall simultaneously.Passed on the sealing surface 4 at end socket manhole place by internal pressure, very big internal pressure is born at manhole sealing surface 4 places on the end socket.Because whole hemispherical head is a hot forming, the wall thickness of end socket is pressed JB/T1609-93 " boiler drum manufacturing technology condition ", allows attenuate 15%.And because the end socket top is a spherical curved surface, ratio of elongation is bigger in calender line, during simultaneously owing to manhole cover sealing surface of processing, so its manhole cover sealing surface place thickness generally can only reach 70% of end socket design thickness, the intensity nargin of its end socket is more weak.

(3) utility model content

At the problems referred to above, the utility model provides a kind of drum spherical sealing, and the sealing surface place thickness of end socket reaches end socket and takes more than 80% of thickness, and the intensity nargin of its end socket is enhanced.

Its technical scheme is such: it comprises dome head, manhole, and described manhole is opened the top in dome head, it is characterized in that: the top of described dome head is a plane, and the inwall of described dome head top correspondence is a plane.

It is further characterized in that: plane, described dome head top, inwall plane, top are that the unitary mould compacting forms.

Dome head described in the utility model, its top is a plane, the inwall on top is a plane, when opening manhole, it need not calendering, thickness loss is little, and the inwall on described end socket top is the plane, so not loss of thickness during processing manhole cover sealing surface, so the sealing surface place thickness of its end socket reaches end socket and takes more than 80% of thickness, the intensity nargin of its end socket is enhanced.

(4) description of drawings

Fig. 1 is the front view schematic diagram of existing drum spherical sealing;

Fig. 2 is a front view schematic diagram of the present utility model;

Fig. 3 is for making internal-pressure die front view schematic diagram of the present utility model.

(5) specific embodiment

See Fig. 2, the utility model comprises dome head 1, manhole 2, and manhole 2 is opened the top 3 in dome head 1, and the top 3 of dome head 2 is a plane, and the inwall 4 of dome head top 3 correspondences is a plane.Plane, dome head top 3, inwall plane 4, top form for the unitary mould compacting.

See Fig. 3, it is hemispherical that mold integral is, and the hemispheric top of mould is a plane, and plane, top and bottom sphere are excessive by little circular arc.

See Fig. 1, Fig. 2, describe the utility model below in conjunction with the specific embodiment of Φ 420mm manhole: Φ is an inner diameter among the figure, Φ ₁Be last plane disc diameter, Φ ₂Be bore dia, Φ ₃Be sealing surface disc diameter, d is the design head thickness, and b is actual head thickness, and c plane and cambered surface differ thickness, R ₁Be end socket inwall radius;

See Fig. 3, the used internal-pressure die of drawing Fig. 2, wherein Φ ₄: 500; R:140; R:690.

See Fig. 1, it is that 1380 whole hemispherical head is made that prior art adopts Φ, through measuring: Φ: 1380; R ₁: 690; Φ ₁: 517.16; Φ ₂: 420; Φ ₃: 515; D:60; B:42.76; C:17.12.

See Fig. 2, end socket of the present utility model: Φ: 1380; R ₁: 690; Φ ₁: 517.16; Φ ₂: 420; Φ ₃: 515; D:60; B:53.66; C:4.52.

Contrasting top two parameters can draw, and the actual head thickness 53.66 of the utility model end socket is much larger than prior art gained actual (real) thickness 42.76.

Claims

1, a kind of drum spherical sealing, it comprises dome head, manhole, and described manhole is opened the top in dome head, it is characterized in that: the top of described dome head is a plane, and the inwall of described dome head top correspondence is a plane.

2, according to the described a kind of drum spherical sealing of claim 1, it is characterized in that: plane, described dome head top, inwall plane, top are that the unitary mould compacting forms.