Efficient micro-groove steel plate drying cylinder

Abstract

The utility model provides an efficient micro-groove steel plate drying cylinder which comprises a drying cylinder barrel body, a left end cover is fixedly connected to the left end of the drying cylinder barrel body through bolts, a right end cover is fixedly connected to the right end of the drying cylinder barrel body through bolts, the drying cylinder barrel body is a barrel body with the uniform wall thickness, and micro-grooves of a spiral structure are formed in the inner wall of the barrel body. A main shaft provided with a transmission bearing is fixedly connected to the middle of the outer surface of the right end cover, a steam inlet shaft pipe is fixedly connected to the middle of the outer surface of the left end cover, and a rotary steam inlet head is installed on the steam inlet shaft pipe. According to the device, the thickness of a liquid film becomes nonuniform and the gravity is also inconsistent through the grooves, the liquid film at the grooves is thick and heavy, falls off under the action of the gravity, and forms drop-shaped condensation under the condition that the drying cylinder rotates, so that the heat transfer effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of paper processing, in particular to an efficient micro-grooved steel plate dryer cylinder. Background Technique

[0002] The cast iron dryer cylinder used for paper processing is a key component for paper drying - a type I pressure vessel. The number of cast iron dryer cylinders accounts for about 2 / 3 of the total number of pressure vessels in the paper industry. In terms of manufacturing quality, it is required that there should be no penetrating and excessive sand holes. In order to increase the smoothness of the paper surface, it is required to polish the outer surface of the dryer cylinder and turn the inner surface to make the entire wall of the dryer cylinder keep the same thickness, so as to ensure the safety, balance and uniform heat transfer of the dryer cylinder. The function of the dryer cylinder is to dry the moisture in the paper sheet and finish the paper surface.

[0003] In most paper processing processes in the market, the preheating cylinder body generally uses steam heating. Steam enters from one end of the preheating dryer cylinder and exits from the other end. Although this technical solution is simple and feasible, there is a problem that a relatively thick condensate liquid film is likely to be generated on the inner wall of the preheating dryer cylinder during the heat exchange process between the inner wall and the steam. The generation of the condensate liquid film will not only affect the heat exchange between the preheating dryer cylinder and the steam, but also the large accumulation of condensate water on the inner wall of the preheating dryer cylinder will cause an increase in the power consumption of the preheating dryer cylinder. Content of the Utility Model

[0004] The first object of the utility model is to provide an efficient micro-grooved steel plate dryer cylinder. Through the grooves, the thickness of the liquid film becomes uneven and the gravity is also inconsistent. The liquid film at the grooves is thick and heavy and falls off under the action of gravity, forming dropwise condensation when the dryer cylinder rotates, thereby improving the heat transfer effect. The second object is to use a steel plate with a high thermal conductivity to replace the cast iron material with a low thermal conductivity, thereby improving the heat transfer effect to solve the problems put forward in the above background technique.

[0005] The utility model provides an efficient micro-grooved steel plate dryer cylinder, which includes a dryer cylinder body. The left end of the dryer cylinder body is fixedly connected with a left end cover by bolts, and the right end of the dryer cylinder body is fixedly connected with a right end cover by bolts. The middle part of the outer surface of the right end cover is fixedly connected with a main shaft for installing a transmission bearing. The inner wall of the dryer cylinder body is provided with a spiral micro-groove structure;

[0006] The middle part of the outer surface of the left end cover is fixedly connected with a steam inlet shaft pipe, and a rotary steam inlet head is installed on the steam inlet shaft pipe.

[0007] The rotary steam inlet head is provided with a steam inlet pipe and a drain pipe. The steam inlet pipe is used for steam to enter and heat the dryer cylinder, and the drain pipe is used for discharging the steam condensate after heat exchange.

[0008] Preferably, the dryer cylinder body is made of steel plate material.

[0009] Preferably, the steam inlet shaft tube communicates with the inside of the dryer cylinder body.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] 1. The thickness of the liquid film becomes uneven through the grooves, and the gravity is also inconsistent. The liquid film at the grooves is thick and heavy, and falls off under the action of gravity, forming dropwise condensation when the dryer cylinder rotates, thereby improving the heat transfer effect.

[0012] 2. Due to the existence of the grooves, the heat transfer area of the inner surface is increased, thereby improving the heat transfer capacity.

[0013] 3. Since the steel plate dryer cylinder uses a denser material, the distance between microscopic materials is closer, the voids in the space are reduced, the heat transfer resistance is reduced, and the heat transfer efficiency is improved. The density of the traditional cast iron dryer cylinder is 7.3 g / cmm3, and the thermal conductivity is 45 w / (mk); the density of the steel plate dryer cylinder is above 7.8 g / cmm3, and the thermal conductivity is above 48.5 w / (mk).

[0014] 4. The strength of the steel plate dryer cylinder is better than that of cast iron. Therefore, under the same pressure grade, the wall thickness decreases, the heat transfer distance is short, and it is more rapid. Moreover, because the weight is 20% lighter, the transmission power consumption is saved by 10%. Description of the Drawings

[0015] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is the structural view of the present utility model;

[0017] Figure 2 It is the rear view of the dryer cylinder body of the present utility model;

[0018] Figure 3 It is the internal structure diagram of the dryer cylinder body of the present utility model;

[0019] Figure 4 It is the combined view of the rotary joint and the dryer cylinder body of the present utility model.

[0020] Description of the Reference Numerals:

[0021] 1. Dryer cylinder body; 2. Left end cover; 3. Right end cover; 4. Steam inlet shaft tube; 5. Rotary steam inlet head; 6. Main shaft; 10. Micro grooves. Specific Embodiments

[0022] The technical solution of the present utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined. In addition, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] Please refer to Figures 1 to 4 , the present utility model provides a technical solution:

[0026] An efficient micro-grooved steel plate dryer cylinder, including a dryer cylinder body 1, a left end cover 2 is bolted and fixed to the left end of the dryer cylinder body 1, and a right end cover 3 is bolted and fixed to the right end of the dryer cylinder body 1. A main shaft 6 for installing a transmission bearing is fixedly connected to the middle of the outer surface of the right end cover 3, and a spiral-structured micro-groove 10 is provided on the inner wall of the dryer cylinder body 1;

[0027] A steam inlet shaft pipe 4 is fixedly connected to the middle of the outer surface of the left end cover 2, and a rotary steam inlet head 5 is installed on the steam inlet shaft pipe 4.

[0028] The rotary steam inlet head 5 is provided with a steam inlet pipe and a drain pipe. The steam inlet pipe is used for steam to enter the heating dryer cylinder, and the drain pipe is used for discharging the steam condensate after heat exchange. The dryer cylinder body 1 is made of steel plate material, and the steam inlet shaft pipe 4 is communicated with the inside of the dryer cylinder body 1.

[0029] Working principle: Steam enters the inside of the dryer cylinder body 1 through the steam inlet pipe of the rotary steam inlet head 5 on the steam inlet shaft pipe 4 and conducts heat with the micro-grooved cylinder body of the dryer cylinder. The heated dryer cylinder body 1 then dries the paper passing through the surface of the dryer cylinder body 1. The micro-grooves 10 make the thickness of the liquid film uneven and the gravity inconsistent. The liquid film at the grooves is thick and heavy and falls off under the action of gravity, forming dropwise condensation when the dryer cylinder rotates, thereby improving the heat transfer effect. Using a steel plate with a high thermal conductivity instead of a cast iron material with a low thermal conductivity further improves the heat transfer effect. Condensate is generated during the heat exchange process between the steam and the dryer cylinder body 1, and the condensate is discharged through the drain pipe on the rotary steam inlet head 5.

[0030] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An efficient micro-grooved steel plate dryer cylinder, comprising a dryer cylinder body (1), characterized in that: The left end of the dryer cylinder body (1) is fixedly connected by bolts to the left end cover (2), and the right end of the dryer cylinder body (1) is fixedly connected by bolts to the right end cover (3). In the middle of the outer surface of the right end cover (3), a main shaft (6) for installing a transmission bearing is fixedly connected; In the middle of the outer surface of the left end cover (2), a steam inlet shaft pipe (4) is fixedly connected. A rotary steam inlet head (5) is installed on the steam inlet shaft pipe (4), The rotary steam inlet head (5) is provided with a steam inlet pipe and a drain pipe. The steam inlet pipe is used for steam to enter and heat the dryer, and the drain pipe is used for discharging the steam condensate after heat exchange.

2. An efficient micro-grooved steel plate dryer according to claim 1, characterized in that, The dryer cylinder body (1) is made of steel plate material.

3. An efficient micro-grooved steel plate dryer according to claim 2, characterized in that, The inner wall of the dryer cylinder body (1) is provided with micro-grooves (10) in a spiral structure.

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