CN217419149U

CN217419149U - Paper machine dryer

Info

Publication number: CN217419149U
Application number: CN202221311870.7U
Authority: CN
Inventors: 廖畅; 屈健明; 吴镇江; 陈连岳
Original assignee: Vinda Paper China Co Ltd
Current assignee: Vinda Paper China Co Ltd
Priority date: 2022-05-30
Filing date: 2022-05-30
Publication date: 2022-09-13
Anticipated expiration: 2032-05-30

Abstract

The utility model discloses a paper machine drying cylinder, which relates to the technical field of paper making equipment, and the drying cylinder is designed with a high-efficiency heat conduction structure, and the complex reconstruction of adding a plurality of condensing surfaces, clamping sleeves and the like on the inner wall of the cylinder barrel is not carried out, the structure is simple, and the reconstruction cost is low; the layout of the steam outer spray pipe is similar to the layout of the existing spray pipe, and can be used for spraying steam out of the end of the cylinder barrel, then the sprayed steam can move towards the inner wall of the cylinder barrel uniformly like the prior art, and the steam inner spray pipe located at the middle axis of the steam outer spray pipe can spray steam towards the right end cover, and can move along the length direction of the inner wall of the cylinder barrel under the guiding action of the inner arc surface of the right end cover, so that water rings can be dispersed to a certain extent, more high-temperature steam can directly act on the inner wall of the cylinder barrel, and the inner spray pipe, the outer spray pipe and the end cover are combined in structural design, so that the heat transfer performance of the drying cylinder is improved under the condition that the temperature of the steam is not further improved.

Description

Paper machine dryer

Technical Field

The utility model relates to a papermaking equipment technical field particularly, relates to a paper machine dryer.

Background

The heating medium adopted by the existing paper machine drying cylinder is generally water vapor, and when the paper machine drying cylinder works, the water vapor enters the cylinder barrel, transmits heat to paper on the outer cylinder surface of the cylinder barrel through the cylinder barrel wall, and dries moisture in the paper. The working conditions of the drying cylinder of the paper machine are rotating, the higher the production speed of the paper machine, the faster the rotation speed of the drying cylinder. When the rotating speed of the drying cylinder is not high, the condensed water in the cylinder always falls on the lower part of the drying cylinder under the action of gravity, the condensed water can be discharged by a fixed drainage device, but when the rotating speed of the drying cylinder reaches a certain value, namely the rotating speed of a paper machine reaches a certain speed, the condensed water forms a water ring in the drying cylinder due to the action of centrifugal force, the steam for heating is directly sprayed into the cylinder through a steam pipe positioned in the middle shaft position of the cylinder, the steam is diffused from the center position to the periphery, the heat is transferred to the water ring through condensation, the heat is transferred to the wall of the drying cylinder through the water ring, and finally the steam is transferred to a wet paper pulp layer on the outer wall of the drying cylinder. At present, in order to improve the heat conduction capacity, one measure is to increase the temperature of the water vapor, but the increase of the temperature of the water vapor inevitably brings the increase of the pressure of the water vapor, thereby increasing the risk of safety, and the requirement of the structural strength of the equipment also needs to be improved. For the above reasons, there is a need to design a paper machine dryer with higher heat transfer performance without further increase of the water vapour temperature.

SUMMERY OF THE UTILITY MODEL

The utility model provides a paper machine dryer, it can alleviate above-mentioned problem.

In order to alleviate the above-mentioned problem, the utility model discloses the technical scheme who takes as follows:

the utility model provides a paper machine drying cylinder, which comprises a cylinder barrel, a steam spray pipe and a siphon pipe, wherein the cylinder barrel is connected with a left end cover with a left rotating shaft and a right end cover with a right rotating shaft in a sealing way;

the inner side surfaces of the left end cover and the right end cover are both concave arc-shaped surfaces connected with the inner wall surface of the cylinder barrel, so that the flow direction of water vapor is guided, and steam flow along the length direction of the inner wall of the cylinder barrel is formed;

a steam return channel leading to the inside of the cylinder barrel is arranged at the middle shaft position of the left rotating shaft, the steam spray pipe and the siphon pipe penetrate through the left end and the right end of the steam return channel, and the steam spray pipe is coaxially arranged at the middle shaft position of the steam return channel;

the steam spray pipe comprises an outer steam spray pipe and an inner steam spray pipe coaxially arranged on the outer steam spray pipe, a gap for passing through steam is reserved between the outer wall of the inner steam spray pipe and the inner wall of the outer steam spray pipe, a right port of the outer steam spray pipe is located on the left side of the cylinder barrel, and a right port of the inner steam spray pipe is located on the right side of the cylinder barrel.

In a preferred embodiment of the present invention, the right port of the inner steam spraying pipe is provided with a horn nozzle.

In a preferred embodiment of the present invention, the inner side surface of the right end cap is a complete hemisphere, and the right rotating shaft is a solid shaft.

In a preferred embodiment of the present invention, the left end cap and the right end cap are both connected to the cylinder through the flange assembly.

Compared with the prior art, the beneficial effects of the utility model are that:

1) the complex reconstruction such as adding a plurality of condensing surfaces, jackets and the like on the inner wall of the cylinder barrel is not carried out, the structure is simple, and the reconstruction cost is low;

2) the layout of the steam outer spray pipe is similar to the layout mode of the existing spray pipe, and can be used for spraying steam out of the end of the cylinder barrel, then the sprayed steam can move towards the inner wall of the cylinder barrel uniformly like the prior art, and the steam inner spray pipe located at the middle axis of the steam outer spray pipe can spray steam towards the right end cover, and can move along the length direction of the inner wall of the cylinder barrel under the guiding action of the inner arc surface of the right end cover, so that water rings can be dispersed to a certain extent, more high-temperature steam can directly act on the inner wall of the cylinder barrel, and the heat transfer performance of the drying cylinder is improved under the condition that the temperature of the steam is not further improved.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Figure 1 is a schematic view of the structure of a paper machine dryer cylinder according to the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

in the figure: 1-cylinder barrel, 2-left end cover, 3-left rotating shaft, 4-right end cover, 5-right rotating shaft, 6-steam outer spray pipe, 7-steam inner spray pipe, 8-horn spray head, 9-siphon pipe, 10-rotary joint, 11-transition pipe, 12-steam recovery port, 13-bracket and 14-steam backflow channel.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 and 2, the utility model provides a paper machine dryer, which comprises a cylinder barrel 1, a steam spray pipe and a siphon 9, wherein the cylinder barrel 1 is hermetically connected with a left end cover 2 with a left rotating shaft 3 and a right end cover 4 with a right rotating shaft 5;

the inner side surfaces of the left end cover 2 and the right end cover 4 are both concave arc surfaces connected with the inner wall surface of the cylinder barrel 1, so as to guide the flow direction of water vapor and form steam flow along the length direction of the inner wall of the cylinder barrel 1;

a steam return channel 14 leading to the cylinder barrel 1 is arranged at the middle shaft position of the left rotating shaft 3, a steam spray pipe and a siphon pipe 9 penetrate through the left end and the right end of the steam return channel 14, and the steam spray pipe is coaxially arranged at the middle shaft position of the steam return channel 14;

the steam spray pipe comprises a steam outer spray pipe 6 and a steam inner spray pipe 7 coaxially arranged on the steam outer spray pipe 6, a gap used for passing through steam is reserved between the outer wall of the steam inner spray pipe 7 and the inner wall of the steam outer spray pipe 6, the right end opening of the steam outer spray pipe 6 is located on the left side of the cylinder barrel 1, and the right end opening of the steam inner spray pipe 7 is located on the right side of the cylinder barrel 1.

The utility model discloses in, left turn axle 3 and right turn axle 5 are the same with prior art, and equal coaxial the arranging, and the paper machine dryer is when using, and accessible bearing supports left turn axle 3 and right turn axle 5 to can drive cylinder 1 through drive arrangement and rotate.

The utility model discloses in, siphon 9's suction inlet extends to the position that is close to 1 inner wall of cylinder to do not influence 1 normal rotations of cylinder and be the standard, generally at a distance of 1 cm. The condensate in the cylinder 1 can be sucked away by the siphon 9.

The high-temperature water vapor has two jet flow paths of the steam outer nozzle 6 and the steam inner nozzle 7.

The high-temperature steam sprayed from the steam outer nozzle 6 acts in the cylinder 1 in substantially the same manner as in the prior art, as indicated by the arrow at the right end of the steam outer nozzle 6 in fig. 1.

The flow path of a larger part of high-temperature steam sprayed from the steam inner spray pipe 7 is shown by an arrow close to the edge in fig. 1, under the guiding action of the arc-shaped flow guide surface of the right end cover 4, the larger part of high-temperature steam can flow leftwards along the length direction of the cylinder barrel 1 and can break away a larger part of water ring formed by condensed water, so that more high-temperature steam can directly transfer heat to the cylinder barrel 1 without transferring heat to the cylinder barrel 1 through the water ring, and the water steam after heat conduction can enter the steam backflow channel 14 and be recycled under the guiding action of the arc-shaped flow guide surface of the left end cover 2, and the steam flow impacting the water ring can be avoided from being negatively influenced by the design of the arc-shaped flow guide surface of the left end cover 2.

In an optional embodiment of the present invention, the right port of the steam inner nozzle 7 is provided with a horn nozzle 8.

In this embodiment, the trumpet nozzle 8 also serves as a steam guide.

In an optional embodiment of the present invention, the inner side surface of the right end cap 4 is a complete hemisphere, and the right rotating shaft 5 is a solid shaft.

In the prior art, the right rotating shaft 5 is usually designed as a hollow shaft for installing a siphon structure, but since the siphon 9 is designed on the left side in the embodiment, the right rotating shaft 5 can be directly designed as a solid shaft, so that the inner side surface of the right end cover 4 can be ensured to be a complete hemispherical surface.

In an optional embodiment of the present invention, the left end cap 2 and the right end cap 4 are both connected to the cylinder barrel 1 through the flange assembly.

Among the prior art, often directly punch on the end cover and pass through screwed connection in cylinder 1, in this embodiment, adopt the flange subassembly, the dismouting is all very convenient, and the maintenance of being convenient for, and easily realize sealedly.

In an optional embodiment of the present invention, the left end of the left rotating shaft 3 is connected to a transition pipe 11 through a rotary joint 10, the transition pipe 11 is provided with a bracket 13 and a steam recovery port 12 communicated with the steam return channel 14, and the steam spraying pipe and the siphon 9 all penetrate through the transition pipe 11 and the rotary joint 10.

In the embodiment, the rotary joint 10 and the transition pipe 11 are adopted to match with the left rotating shaft 3, so that the water vapor is easily recovered, the siphon 9 and the steam nozzle are conveniently arranged, and the rotation of the rotating shaft is not influenced.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A paper machine dryer comprises a cylinder barrel, a steam spray pipe and a siphon pipe, wherein the cylinder barrel is connected with a left end cover with a left rotating shaft and a right end cover with a right rotating shaft in a sealing way,

the steam spray pipe comprises a steam outer spray pipe and a steam inner spray pipe coaxially arranged in the steam outer spray pipe, a gap used for passing through steam is reserved between the outer wall of the steam inner spray pipe and the inner wall of the steam outer spray pipe, a right end opening of the steam outer spray pipe is located on the left side of the cylinder barrel, and a right end opening of the steam inner spray pipe is located on the right side of the cylinder barrel.

2. Paper machine cylinder according to claim 1, characterized in that the right port of the inner steam nozzle tube is provided with a trumpet nozzle.

3. A paper machine cylinder according to claim 1 or 2, characterized in that the inner side of the right end closure is a full hemisphere and that the right turning shaft is a solid shaft.

4. Paper machine cylinder according to claim 1, characterized in that the left and right end covers are each sealingly connected to the cylinder drum by a flange assembly.

5. Paper machine cylinder according to claim 1, characterized in that the left port of the left turning shaft is connected with a transition pipe by means of a rotary joint, the transition pipe being provided with a bracket and a steam recovery opening communicating with the steam return channel, the steam nozzle and siphon both penetrating the transition pipe and the rotary joint.