阅读说明：本技术 一种具有相变恒温的导热油烘缸 (Heat conduction oil dryer with phase change constant temperature ) 是由 苏伟光 王丽 许崇海 高永法 秦士友 刘亚 李亚男 于 2019-10-17 设计创作，主要内容包括：本发明涉及一种具有相变恒温的导热油烘缸,烘缸为两端封口的缸体,缸体为圆筒体的结构；烘缸的侧壁为双层结构,分别为内缸壁和外缸壁,烘缸的两端管口内侧位置分别设置进油槽和出油槽,进油槽和出油槽通过若干导热油管连接；若干导热油管分布在内缸壁和外缸壁之间,导热油管的两端分别穿过内缸壁,并分别与进油槽和出油槽连接；内缸壁和外缸壁之间填充相变材料。在内缸壁和外缸壁之间的导热油管为螺旋形状,一端接进油槽,一端接出油槽。减小了导热油烘缸外侧壁的外表面和内表面的温差,提高了换热效果。(The invention relates to a heat-conducting oil drying cylinder with phase-change constant temperature, wherein the drying cylinder is a cylinder body with two sealed ends, and the cylinder body is in a cylinder structure; the side walls of the drying cylinder are of a double-layer structure and respectively comprise an inner cylinder wall and an outer cylinder wall, the inner sides of pipe orifices at two ends of the drying cylinder are respectively provided with an oil inlet tank and an oil outlet tank, and the oil inlet tank and the oil outlet tank are connected through a plurality of heat-conducting oil pipes; a plurality of heat conduction oil pipes are distributed between the inner cylinder wall and the outer cylinder wall, and two ends of each heat conduction oil pipe respectively penetrate through the inner cylinder wall and are respectively connected with the oil inlet groove and the oil outlet groove; and phase-change materials are filled between the inner cylinder wall and the outer cylinder wall. The heat conducting oil pipe between the inner cylinder wall and the outer cylinder wall is spiral, one end of the heat conducting oil pipe is connected with the oil inlet groove, and the other end of the heat conducting oil pipe is connected with the oil outlet groove. The temperature difference between the outer surface and the inner surface of the outer side wall of the heat-conducting oil drying cylinder is reduced, and the heat exchange effect is improved.)

1. The utility model provides a conduction oil dryer with constant temperature of phase transition which characterized in that: the drying cylinder is a cylinder body with two sealed ends, and the cylinder body is a cylinder body structure;

the side walls of the drying cylinder are of a double-layer structure and respectively comprise an inner cylinder wall and an outer cylinder wall, the inner sides of pipe orifices at two ends of the drying cylinder are respectively provided with an oil inlet tank and an oil outlet tank, and the oil inlet tank and the oil outlet tank are connected through a plurality of heat-conducting oil pipes;

a plurality of heat conduction oil pipes are distributed between the inner cylinder wall and the outer cylinder wall, and two ends of each heat conduction oil pipe respectively penetrate through the inner cylinder wall and are respectively connected with the oil inlet groove and the oil outlet groove;

and phase-change materials are filled between the inner cylinder wall and the outer cylinder wall.

2. A thermal oil drying cylinder with constant temperature of phase transition according to claim 1, characterized in that: the two ends of the cylinder body respectively extend out of the oil inlet pipe and the oil outlet pipe, the oil inlet pipe is connected with the oil inlet tank, and the oil outlet pipe is connected with the oil outlet tank.

3. A thermal oil drying cylinder with constant temperature of phase transition according to claim 1, characterized in that: the heat conducting oil pipe between the inner cylinder wall and the outer cylinder wall is spiral, one end of the heat conducting oil pipe is connected with the oil inlet groove, and the other end of the heat conducting oil pipe is connected with the oil outlet groove.

4. A thermal oil drying cylinder with constant temperature of phase transition according to claim 3, characterized in that: the diameter of the oil inlet groove is 20-30% of the diameter of the drying cylinder, the height of the oil inlet groove is 5-10% of the length of the drying cylinder, the diameter of the oil outlet groove is 20-30% of the diameter of the drying cylinder, and the height of the oil outlet groove is 5-10% of the length of the drying cylinder.

5. A thermal oil drying cylinder with constant temperature of phase transition according to claim 1, characterized in that: the diameter of the heat conduction oil pipe is 1-2% of the diameter of the drying cylinder.

6. A thermal oil drying cylinder with constant temperature of phase transition according to claim 1, characterized in that: the distance between the inner cylinder wall and the outer cylinder wall is 2-3% of the diameter of the drying cylinder.

7. A thermal oil drying cylinder with constant temperature of phase transition according to claim 1, characterized in that: the phase-change material is an organic phase-change material or a low-melting-point metal material.

8. The thermal oil drying cylinder with phase-change constant temperature of claim 7, characterized in that: the organic phase change material is methyl fumarate, succinic anhydride, valproic acid, benzoic acid, stilbene, phenacetin or salicylic acid.

9. A thermal oil dryer with phase transition constant temperature according to claim 8, characterized in that: the low-melting-point metal is metal indium, lithium or tin-bismuth alloy.

Technical Field

The invention belongs to the technical field of papermaking drying equipment, and particularly relates to a heat conduction oil drying cylinder with phase change constant temperature.

Background

The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.

Drying is an important unit in the papermaking process, common drying cylinders comprise a steam drying cylinder, a heat conduction oil drying cylinder, a heat radiation drying cylinder and the like, but the surface temperature difference of the drying cylinder taking heat conduction oil and steam as heat sources is large, and although the temperature difference is successfully reduced through structural improvement at present. For example, the rotary type multi-hole and multi-cavity heat conduction oil exchanger (application No. 201810798729.6) invented by Shandong Lutai group Zaozhuang Shangdu paper making machinery limited company innovatively designs a rotary type multi-hole and multi-cavity heat conduction oil exchanger by using heat conduction oil as a heat source, and comprises an outer cylinder, an inner cylinder, an upper sealing head and a lower sealing head, wherein the outer part of the inner cylinder is sleeved with the outer cylinder, an oil guide cavity is arranged between the inner cylinder and the outer cylinder, two ends of the inner cylinder are connected with the upper sealing head and the lower sealing head, an oil through operation side shaft head is fixedly connected with the upper sealing head, an oil through transmission side shaft head is fixedly connected with the lower sealing head, a plurality of partition plates are axially arranged on the outer peripheral surface of the inner cylinder, the oil guide cavity on the outer peripheral surface of the inner cylinder is divided into a plurality of oil cavity units I, a baffle plate is arranged in each oil cavity unit I, the oil cavity units I . Under the condition that a plurality of oil guide cavities are shared, every two oil guide cavities are communicated; a plurality of metal hoses for guiding hot oil from two sides; thus, the effects that oil enters from two sides and the temperature difference between two sides of the oil cylinder is reduced to 0.48 ℃ are achieved. But the internal structure is more complicated and the surface temperature difference cannot be eliminated.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a heat-conducting oil drying cylinder with phase-change constant temperature.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a heat conducting oil drying cylinder with phase change constant temperature is provided, wherein the drying cylinder is a cylinder body with two sealed ends, and the cylinder body is a cylinder body structure;

the side walls of the drying cylinder are of a double-layer structure and respectively comprise an inner cylinder wall and an outer cylinder wall, the inner sides of pipe orifices at two ends of the drying cylinder are respectively provided with an oil inlet tank and an oil outlet tank, and the oil inlet tank and the oil outlet tank are connected through a plurality of heat-conducting oil pipes;

a plurality of heat conduction oil pipes are distributed between the inner cylinder wall and the outer cylinder wall, and two ends of each heat conduction oil pipe respectively penetrate through the inner cylinder wall and are respectively connected with the oil inlet groove and the oil outlet groove;

and phase-change materials are filled between the inner cylinder wall and the outer cylinder wall.

The heat conduction oil enters the oil outlet groove from the oil inlet groove through the heat conduction oil pipe, wherein the heat conduction oil pipe heats the phase change material filled in the interlayer of the cylinder body, namely the interlayer between the inner cylinder wall and the outer cylinder wall. In the working process, the phase-change material is used as a heat storage material and a heat transfer buffer medium, continuously absorbs heat from the heat conduction oil pipeline to melt, and is condensed in the process of transferring heat to paper by the outer cylinder wall to release heat. The phase-change material can automatically balance the temperature change of the outer cylinder body and the inner cylinder body, so that the surface temperature difference of the cylinder body is reduced, and the phase-change material plays an important role in controlling the paper drying process and improving the moisture content and the product quality stability; the invention can enable the heat-conducting oil drying cylinder to better play a heat-conducting role, the phase-change material in contact with the wet paper is condensed and releases heat in the working process, then the drying cylinder rotates to enable the condensation area to be in contact with air, the outward heat transfer rate of the outer cylinder wall is reduced, the heat-conducting oil heats the phase-change material to melt, and the cycle work is carried out; and the drying cylinder rotates at a high speed, and the solid phase-change material and the liquid phase-change material are mixed with each other under the action of the eccentricity, so that the heat transfer process of the heat storage layer can be enhanced, the temperature of the heat storage layer is more uniform, and the outer cylinder wall and the inner cylinder wall can be promoted to further uniformly disperse heat.

In some embodiments, two ends of the cylinder body respectively extend out of the oil inlet pipe and the oil outlet pipe, the oil inlet pipe is connected with the oil inlet tank, and the oil outlet pipe is connected with the oil outlet tank.

In some embodiments, the heat transfer oil pipe between the inner and outer cylinder walls is spiral in shape, with one end connected to the oil sump and the other end connected to the oil sump.

In some embodiments, the oil inlet groove and the oil outlet groove are closed cylindrical groove bodies, a plurality of oil holes are formed in the side wall of each groove body, and the heat conduction oil pipe is fixedly connected with the oil holes.

Preferably, the diameter of the oil inlet groove is 20% -30% of the diameter of the drying cylinder, the height of the oil inlet groove is 5% -10% of the length of the drying cylinder, and the diameter of the oil outlet groove is 20% -30% of the diameter of the drying cylinder, and the height of the oil outlet groove is 5% -10% of the length of the drying cylinder. The oil inlet groove and the oil outlet groove are mainly used for buffering and distributing heat conducting oil.

Preferably, the diameter of the heat-conducting oil pipe is 1-2% of the diameter of the drying cylinder.

In some embodiments, the distance between the inner and outer cylinder walls is 2% -3% of the cylinder diameter.

In some embodiments, the phase change material is an organic phase change material or a low melting point metallic material.

Preferably, the organic phase change material is methyl fumarate, succinic anhydride, valproic acid, benzoic acid, stilbene, phenacetin or salicylic acid.

The low melting point metal may be an alloy of indium, lithium or tin and bismuth.

The invention has the beneficial effects that:

the heat-conducting oil drying cylinder disclosed by the invention realizes uniform and stable temperature of the surface of the drying cylinder, and the surface temperature is stabilized at the phase change point of the phase change material, so that the problem of uneven drying caused by large surface temperature difference of the traditional drying cylinder in the use process of the heat-conducting oil drying cylinder is solved. In actual use, the phase change material can be replaced according to the use temperature, and the phase change points of different phase change materials are different, so that the temperature of the heat conduction oil drying cylinder can be conveniently controlled; in the high-speed rotation process of the rotary drum, the solid phase-change material and the liquid phase-change material are mixed with each other under the action of centrifugal force, so that the heat transfer process of the heat storage layer can be enhanced, and the temperature of the heat storage layer is more uniform.

The heat conducting oil drying device has the advantages of simple structure, low manufacturing difficulty, low cost and convenience in application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention.

FIG. 1 is a schematic view of the internal structure of a port face for heat transfer oil drying according to the present invention;

FIG. 2 is a schematic view of the top view of the internal structure of the heat transfer oil drying apparatus of the present invention;

the device comprises a drying cylinder 1, a drying cylinder 2, an inner cylinder wall 3, an outer cylinder wall 4, an oil inlet groove 5, an oil outlet groove 6, a heat conduction oil pipe 7, an oil inlet pipe 8 and an oil outlet pipe.

Detailed Description

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

As shown in fig. 1, the oil discharge tank 5 or the oil feed tank 4 are connected to each other by a heat-conductive oil pipe 6.

The side wall of the oil inlet tank 4 is provided with a plurality of oil holes, a plurality of heat conduction oil pipes 6 are respectively connected with the oil holes, and the heat conduction oil pipes 6 on the outer side of the oil inlet tank 4 are radially arranged; the outlet ends of a plurality of heat conduction oil pipes 6 are respectively connected with the oil inlet tank 4, and the heat conduction oil pipes 6 on the outer side of the oil outlet tank 5 are radially arranged; the heat conducting oil enters a plurality of heat conducting oil pipes 6 from the oil inlet groove 4 at the same time, enters the part between the inner cylinder wall 2 and the outer cylinder wall 3, and then completely flows back to the oil outlet groove 5 in a radial shape.

The phase change material is filled between the inner cylinder wall 2 and the outer cylinder wall 3, and the solid-liquid phase change material can flow between the inner cylinder wall 2 and the outer cylinder wall 3.

Part of the heat conduction oil pipe 6 is distributed between the inner cylinder wall 2 and the outer cylinder wall 3 of the drying cylinder 1, and the heat conduction oil reaches the other end of the drying cylinder 1 from one end of the drying cylinder 1 through the side wall, so that the problem of uneven heat exchange of the drying cylinder 1 is solved.

Compared with the prior art, the invention is different in that the two ends of the drying cylinder 1 are respectively provided with the oil outlet groove 5 and the oil inlet groove 4, the oil outlet groove 5 and the oil inlet groove 4 can realize the temporary storage of heat conduction oil, and then the heat conduction oil can be uniformly and radially discharged, after the heat conduction oil enters between the inner cylinder wall and the outer cylinder wall, the heat conduction oil carries out uniform heat conduction and heat exchange in the side wall of the drying cylinder, and the problem of nonuniform heat exchange of the heat conduction oil drying cylinder is solved.

Seen from the side, the heat conduction oil cylinder is similar to the shape of a wheel, the drying cylinder 1 is a cylinder structure, after the drying cylinder 1 rotates, under the action of centrifugal force, phase-change materials flow along the inner wall of the outer cylinder wall, liquid films are formed by the phase-change materials of the liquid, the phase-change materials meet the outer surface of the drying cylinder 1, and heat release is carried out after temperature difference occurs, so that the temperature difference of the surface of the drying cylinder 1 is reduced, and meanwhile, the surface temperature of the drying cylinder 1 is uniformly distributed. The problem of current dryer 1 inside and outside surface difference in temperature great is solved.

Two ends of the heat conduction oil pipe 6 respectively penetrate through the inner cylinder wall 2 and keep sealing with the inner cylinder wall 2, so that the phase change material is prevented from leaking between the inner cylinder wall 2 and the outer cylinder wall 3.

The heat conducting oil pipes are spirally arranged between the inner cylinder wall 2 and the outer cylinder wall 3, as shown in fig. 2, the flow direction of the heat conducting oil is from the direction of the oil inlet tank 4 to the direction of the oil outlet tank 5, then from the direction of the oil outlet tank 5 to the direction of the oil inlet tank 4, then from the direction of the oil inlet tank 4 to the direction of the oil outlet tank 5, and then the heat conducting oil pipes penetrate through the inner cylinder wall 2 and then enter the oil outlet tank 5. During the flowing process, the phase-change material is heated by sufficient heat exchange with the phase-change material.

The oil inlet groove 4 is connected with the oil inlet pipe 7, the oil outlet groove 5 is connected with the oil outlet pipe 8, the oil inlet pipe 7 is used for oil inlet, the oil outlet pipe 8 is used for oil outlet, the oil inlet pipe 7 and the oil outlet pipe 8 can enable the whole drying cylinder 1 to rotate, and the flowing of heat conducting oil is not influenced in the rotating process.

The diameter and height of the oil inlet tank 4 and the oil outlet tank 5 cannot be too large, the diameter is 20-30% of the diameter of the drying cylinder, and the height is 5-10% of the length of the drying cylinder. For example, the drying cylinder has a diameter of 2500 mm, a length of 2000 mm, an oil inlet groove with a diameter of 600 mm and a height of 200mm, an oil outlet groove with a diameter of 600 mm and a height of 200mm, a heat conduction oil pipe with a diameter of 40mm, and a distance between the inner cylinder wall and the outer cylinder wall of 70 mm.

The phase transition temperature of the organic phase change material is shown in table 1:

TABLE 1 phase transition temperature of the materials

The phase transition temperature of low-melting point metal such as tin-bismuth alloy can be adjusted between 47-280 ℃ through alloy proportion, for example: bi₅₈Sn₄₂The phase transition temperature of (1) is 138 ℃, indium is 156.8 ℃ and lithium is 186 ℃.

The phase-change material can be replaced according to the process requirements, so that the surface temperature of the drying cylinder is always maintained at the phase-change point of the phase-change material, and the surface temperature difference of the drying cylinder can be effectively reduced; for corrosive phase-change materials, the inner cylinder wall and the outer cylinder wall need to be subjected to anticorrosion treatment.

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.