CN112030593A

CN112030593A - Reducing pipe hollow shaft, drainage device and Yankee cylinder

Info

Publication number: CN112030593A
Application number: CN202010869949.0A
Authority: CN
Inventors: 杨欢诚
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2020-12-04

Abstract

The invention is suitable for the field of paper drying, and provides a hollow shaft of a reducing pipe, a drainage device and a Yankee cylinder. The reducing pipe hollow shaft comprises: the reducing pipe is provided with a large head end and a small head end; the reducing pipe is provided with at least two reducing pipes; the plurality of reducing pipes are communicated with each other through a large head end and a small head end; a riser pipe; at least two groups of riser tubes are arranged; each group of riser tubes is respectively communicated with the large head end of each reducing pipe. According to the hollow shaft with the reducing pipes, provided by the embodiment of the invention, the number of the reducing pipes and the riser pipes is increased, so that the discharge flow of the blown steam and condensed water is increased, and the drainage efficiency and the heat transfer efficiency are improved; the hollow shaft of the reducing pipe can be applied to a Yankee cylinder in a wide-width paper machine.

Description

Reducing pipe hollow shaft, drainage device and Yankee cylinder

Technical Field

The invention belongs to the field of paper drying, and particularly relates to a hollow shaft of a reducing pipe, a drainage device and a Yankee cylinder.

Background

In the papermaking process, drying of the paper web is still based on the cylinder drying method, the main principle of which is drying by transferring steam heat to the wet paper sheet to evaporate its water. The condensed water discharge device of the drying cylinder is a mechanical device which utilizes the pressure difference between steam and a water discharge section to discharge the condensed water. There are three forms of drainage of the condensed water: scoop type, fixed siphon type and rotary siphon type. The scoop type drainage device is only adopted in the old low-speed paper machine, and the prior high-speed paper machine is not adopted; the fixed siphon type is generally used on a wide paper machine, the inner wall of a drying cylinder is not provided with a groove, the inner wall is provided with a turbulence bar to damage a water ring and enhance heat transfer and drainage, and the distance between a pipe orifice and the cylinder wall is 2-3 mm; the rotary siphon type siphon adopts siphon thin tubes to bundle and is connected with the water collecting square tube, the rotary siphon is connected with the hollow drain pipe through the riser tube, the drain end is fixedly arranged on a transmission side end cover in the drying cylinder, and the rotary siphon is generally distributed in 360-degree equal distribution on the same plane by 2-8 siphons (also called riser tubes) as a group and rotates together with the drying cylinder. When the speed of a vehicle is high, the siphon pipe drainage pressure is increased due to the action of centrifugal force, and drainage is difficult. However, if steam (i.e., blow-through steam, in the dryer, the uncondensed steam exiting the drain is called "blow-through steam") is allowed to exit the siphon with the condensed water, the effective density of the drain is greatly reduced, resulting in a much lower drain pressure differential.

The yankee cylinder is one of drying cylinders and is integrally constructed into a cylindrical cylinder body, and a hollow shaft is arranged in the middle of the cylinder body and is used as a gravity support (end face support) of the cylinder body and a transmission shaft for rotating the cylinder body. The discharge flow of the blown steam and the condensed water is the sectional area of the upflow tube group, and in the existing design, no matter how the diameter and the width of the Yankee cylinder are changed, only one group of upflow tube group is designed for discharging water, and the upflow tube group can not meet the requirements of discharging water and steam, so that the Yankee cylinder is unsmooth in discharging water, and the heat transfer efficiency is reduced.

Disclosure of Invention

An object of an embodiment of the present invention is to provide a hollow shaft with a reducing pipe, which aims to solve the problems mentioned in the background art.

The embodiment of the present invention is achieved by a hollow shaft of a reducing pipe, including:

the reducing pipe is provided with a large head end and a small head end; the reducing pipe is provided with at least two reducing pipes; the plurality of reducing pipes are communicated with each other through a large head end and a small head end;

a riser pipe; at least two groups of riser tubes are arranged; each group of riser tubes is respectively communicated with the large head end of each reducing pipe.

Preferably, the hollow shaft of the reducer further includes:

a connecting member; the connecting piece is arranged on the big end of the reducing pipe; the riser pipe is communicated with the large head end of the reducing pipe through the connecting piece;

a straight pipe section; the straight pipe section is arranged between the connecting piece and the small head end of the reducing pipe; the small end of one of the reducing pipes is communicated with the large end of the other reducing pipe through the connecting piece and the straight pipe section.

It is another object of an embodiment of the present invention to provide a drainage apparatus including a hollow support shaft provided with a through hole and a hollow shaft of a reducing pipe as described in any one of the above, the reducing pipe being disposed inside the hollow support shaft.

Preferably, the drain apparatus further includes:

at least one header pipe; one end of the riser pipe, which is far away from the reducing pipe, is communicated with the water collecting pipe; the water collecting pipe is arranged outside the hollow supporting shaft;

at least one group of siphon thin pipes are bundled; each group of siphon thin tubes is respectively communicated with each water collecting pipe.

Preferably, the drain apparatus further includes:

a collector pipe support; one end of the water collecting pipe supporting piece is connected with the hollow supporting shaft, and the other end of the water collecting pipe supporting piece is connected with the water collecting pipe.

Another object of an embodiment of the present invention is to provide a yankee cylinder, which includes a cylinder body and any one of the drainage devices described above, wherein the drainage device is disposed in the cylinder body; the hollow supporting shaft is fixedly connected with the cylinder body.

Preferably, the yankee cylinder further includes:

a steam inlet pipe; the steam inlet pipe is arranged on the cylinder body; the steam inlet pipe is communicated with the hollow supporting shaft;

a steam outlet pipe; the steam outlet pipe is arranged on the cylinder body; the steam inlet pipe is communicated with the hollow support shaft.

Preferably, the yankee cylinder further includes:

the flow disturbing rod is arranged on the inner wall of the cylinder body.

Preferably, the inner wall of the cylinder body is provided with a groove, and one end of the siphon tubule bundle is arranged in the groove.

According to the hollow shaft with the reducing pipes, provided by the embodiment of the invention, the number of the reducing pipes and the riser pipes is increased, so that the discharge flow of the blown steam and condensed water is increased, and the drainage efficiency and the heat transfer efficiency are improved; the hollow shaft of the reducing pipe can be applied to a Yankee cylinder in a wide-width paper machine.

Drawings

Fig. 1 is a schematic structural diagram of a hollow shaft of a reducing pipe according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a drainage device according to an embodiment of the present invention;

FIG. 3 is a side view of a Yankee cylinder provided in accordance with an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a yankee cylinder including a hollow shaft of a secondary reducing pipe according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a yankee cylinder including a four-stage reducing pipe hollow shaft according to an embodiment of the present invention;

FIG. 6 is a perspective view of a Yankee cylinder provided in accordance with an embodiment of the present invention;

fig. 7 is a schematic structural view of a siphon tube bundle according to an embodiment of the present invention.

In the drawings: 1. a reducing pipe; 2. a riser pipe; 3. a hollow support shaft; 4. a water collection pipe; 5. collecting the bundle by using a siphon thin tube; 6. a cylinder body; 7. a steam inlet pipe; 8. a steam outlet pipe; 9. a collector pipe support; 10. a connecting member; 11. a straight pipe section.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Specific implementations of the present invention are described in detail below with reference to specific embodiments.

As shown in fig. 1, a schematic structural diagram of a hollow shaft of a reducing pipe according to an embodiment of the present invention is provided, where the hollow shaft of a multistage reducing pipe includes:

the reducing pipe 1 is provided with a large head end and a small head end; the reducing pipe 1 is provided with at least two parts; the multiple reducing pipes 1 are communicated through a large head end and a small head end;

a riser pipe 2; at least two groups of riser pipes 2 are arranged; each group of riser pipes 2 is respectively communicated with the large head end of each reducing pipe 1.

In practical application, the number of the reducing pipes 1 and the riser pipes 2 can be designed according to the actual water discharge capacity, and the riser pipes 2 are L-shaped siphon pipes. When a plurality of reducing pipes 1 are arranged, a plurality of groups of riser pipes 2 are correspondingly arranged, the reducing pipes 1 are communicated with each other through a large head end and a small head end, and each group of riser pipes 2 is formed by arranging 2-8 riser pipes 2 on the end face of the large head end of each reducing pipe 1 in a 360-degree equal distribution mode. According to the embodiment of the invention, the number of the reducing pipes 1 and the riser pipes 2 is increased, so that the discharge flow of the blown steam and the condensed water is increased, and the drainage efficiency and the heat transfer efficiency are improved.

As shown in fig. 1, as a preferred embodiment of the present invention, the hollow shaft of the multistage reducing pipe further includes:

a connecting member 10; the connecting piece 10 is arranged on the big end of the reducing pipe 1; the riser pipe 2 is communicated with the large head end of the reducing pipe 1 through the connecting piece 10;

a straight pipe section 11; the straight pipe section 11 is arranged between the connecting piece 10 and the small end of the reducing pipe 1; the small end of one of the reducing pipes 1 is communicated with the large end of the other reducing pipe 1 through the connecting piece 10 and the straight pipe section 11.

Specifically, the connecting member 10 may be a flange, the connecting member 10 is fixed to the end surface of the large end of the reducing pipe 1 by screws, each group of riser pipes 2 is equally distributed on the connecting member 10 by 360 degrees, and one end of each riser pipe 2 is communicated with the reducing pipe 1 through the connecting member 10. When a plurality of reducing pipes 1 are arranged, the small head end of one reducing pipe 1 is communicated with the large head end of the other reducing pipe 1 through a connecting piece 10 and a straight pipe section 11, and the small head end is fixedly arranged in an area surrounded by a plurality of riser pipes 2. In addition, the riser pipe 2 enters the reducing pipe 1 through the connecting piece 10, so that the cavitation of blowing-through steam on the pipe wall of the reducing pipe 1 can be reduced; the connecting pipe flange of the riser pipe 2 is designed at one end of the reducing pipe 1 with an angle of 90 degrees, so that the riser pipe is convenient to manufacture and connect.

As shown in fig. 2, an embodiment of the present invention further provides a drainage device comprising a hollow support shaft 3 provided with a through hole and a hollow shaft of a reducing pipe as described in any one of the above, the reducing pipe 1 being disposed inside the hollow support shaft 3.

In practical application, the riser pipe 2 penetrates through the side wall of the hollow supporting shaft 3 and is fixed with the hollow supporting shaft 3; the hollow shaft of the reducing pipe in the attached figure 2 is a four-stage hollow shaft of the reducing pipe.

As shown in fig. 2 and 7, as a preferred embodiment of the present invention, the drainage apparatus further includes:

at least one header pipe 4; one end of the riser pipe 2, which is far away from the reducing pipe 1, is communicated with the water collecting pipe 4; the water collecting pipe 4 is arranged outside the hollow supporting shaft 3;

at least one group of siphon tube bundles 5; each group of siphon thin tube bundles 5 are respectively communicated with each water collecting pipe 4.

Specifically, the cross section of the water collecting pipe 4 is square, each water collecting pipe 4 is communicated with one or more riser pipes 2 arranged in one direction, and each group of siphon tubule cluster 5 comprises two rows of siphon tubules at a certain angle. The existing rotary siphon type drainage device has the problem that when the vehicle speed is high, the drainage pressure is high due to the action of centrifugal force, so that the drainage is difficult. However, if steam (i.e., blow-through steam) is allowed to escape from the siphon tube with the condensed water entrained therein, the effective density of the drain is greatly reduced, resulting in a much lower drain pressure differential. The optimal flow velocity of the mixed liquid of the steam and the condensed water blown through in the siphon thin tube is 23-46 m/s, and the flow velocity is too high, so that cavitation is generated on the siphon thin tube and the hollow supporting shaft 3. Further, the more steam is mixed into the condensate, the lower the density of the mixed liquid becomes, and the smaller the pressure difference (difference between the steam inlet pressure and the condensate discharge pressure) becomes, the easier the mixed liquid is to be discharged from the siphon tube.

As shown in fig. 2, as a preferred embodiment of the present invention, the drainage apparatus further includes:

a header pipe support 9; one end of the water collecting pipe supporting piece 9 is connected with the hollow supporting shaft 3, and the other end of the water collecting pipe supporting piece is connected with the water collecting pipe 4.

Specifically, the water collecting pipe supporting member 9 may be an integral structure or a plurality of supporting rods, and the water collecting pipe 4 is fixedly connected with the hollow supporting shaft 3 through the water collecting pipe supporting member 9.

As shown in fig. 3 to 6, an embodiment of the present invention further provides a yankee cylinder, which includes a cylinder body 6 and any one of the drainage devices described above, wherein the drainage device is disposed in the cylinder body 6; the hollow supporting shaft 3 is fixedly connected with the cylinder body 6.

In practical application, the cylinder body 6 can be made of cast iron and steel, the cylinder wall of the cast iron cylinder is thicker, the pressure bearing capacity is lower than that of a steel cylinder (the working pressure can reach 7 bar), and the cast iron cylinder is gradually eliminated. Steel cylinders have emerged for nearly 15 years and are increasingly used in large quantities. The steel cylinder is characterized in that the wall of the cylinder is about half thinner than that of the cast iron cylinder, the bearing capacity is high (the working pressure can reach 9 bar), and the heat transfer efficiency of the steel cylinder is 15-30% higher than that of the cast iron cylinder. The two sides of the Yankee cylinder are divided into an operation side and a transmission side, high-pressure steam entering the Yankee cylinder is generally 7-8 bar, the high-pressure steam enters the hollow supporting shaft 3 from the operation side and enters the Yankee cylinder through the through hole in the hollow supporting shaft 3, the high-pressure steam meets the inner wall of the Yankee cylinder at a low temperature and releases latent heat, and after the wet paper absorbs heat on the surface of the Yankee cylinder, moisture is evaporated, and the dryness of a finished product reaches 95-96%. High-pressure steam after latent heat is released forms condensed water, the condensed water, uncondensed high-pressure steam and non-condensable gas are sucked into the water collecting square pipe through the siphon tube bundle 5, then enter the reducing pipe 1 through the riser pipe 2, and are discharged from the transmission side. Furthermore, in order to allow the steam and condensate blown through the collecting pipe 4 at the far end of the drive side to be discharged as quickly as possible, the length of the small end of the reducing pipe 1 close to the drive side can be gradually increased.

As shown in fig. 3 to 6, as a preferred embodiment of the present invention, the yankee cylinder further includes:

a steam inlet pipe 7; the steam inlet pipe 7 is arranged on the cylinder body 6; the steam inlet pipe 7 is communicated with the hollow supporting shaft 3;

a steam outlet pipe 8; the steam outlet pipe 8 is arranged on the cylinder 6; the steam inlet pipe 7 communicates with the hollow support shaft 3.

Specifically, the steam inlet pipe 7 is close to the large end of the reducing pipe 1, and the operation side of the Yankee cylinder is on the same side as the steam inlet pipe 7; the steam outlet pipe 8 is close to the small end of the reducing pipe 1, and the transmission side of the Yankee cylinder is on the same side as the steam outlet pipe 8.

As a preferred embodiment of the present invention, the yankee cylinder further includes:

and the turbulence bar is arranged on the inner wall of the cylinder body 6.

Particularly, the turbulence bars can enable the condensed water ring to generate oscillation, so that strong turbulence is obtained, and the turbulence bars are widely applied to wide-width paper machines. The turbulence bars are arranged on the inner wall of the cylinder body 6, move synchronously with the cylinder body 6 and break the water ring, and promote the condensed water layer in the cylinder body 6 to generate local disturbance and turbulence so as to improve the heat transfer uniformity and drying efficiency of the cylinder body 6.

In a preferred embodiment of the present invention, a groove is formed on an inner wall of the cylinder 6, and one end of the siphon bundle 5 is disposed in the groove.

Specifically, on high-speed toilet paper machine, except that steam condensate system uses the heat pump, raise and claim jar and generally adopt the ditch slot formula (do not take the vortex stick), drainage device is with rotatory siphon and siphon tubule 5 tied in a bundle, 5 distance about 1.25~2mm apart from the ditch slot bottom that siphon tubule is tied in a bundle, siphon tubule 5 tied in a bundle stretches into raise and claim jar slot and with comdenstion water, the steam that does not condense and noncondenstion gas suction together.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A reduced pipe hollow shaft, comprising:

2. The reducer hollow shaft according to claim 1, further comprising:

3. A drainage device comprising a hollow support shaft provided with a through hole and a hollow shaft of a reducer according to any one of claims 1 to 2, the reducer being disposed within the hollow support shaft.

4. A drain arrangement according to claim 3, further comprising:

5. The drain of claim 4, further comprising:

6. A Yankee cylinder, characterized in that it comprises a cylinder body and a drainage device according to any one of claims 3 to 5, said drainage device being provided inside said cylinder body; the hollow supporting shaft is fixedly connected with the cylinder body.

7. A Yankee cylinder according to claim 6, characterized in that it further comprises:

8. A Yankee cylinder according to claim 6, characterized in that it further comprises:

the flow disturbing rod is arranged on the inner wall of the cylinder body.

9. A Yankee cylinder according to claim 6, characterized in that a groove is provided on the inner wall of the cylinder body, and one end of the siphon thin tube bundle is disposed in the groove.