Heat exchange roller

Abstract

The utility model discloses a heat exchange roller which comprises an outer roller body and an inner roller body, and the outer roller body is coaxially arranged on the periphery of the inner roller body. Flow channels are machined in the roller wall of the outer roller, a supporting structure is formed between every two adjacent flow channels, and the supporting structures abut against the outer circumferential face of the inner roller. On the basis of not reducing the cross sectional area of the fluid flow channel and increasing the material cost of the outer roller (not replacing the material of the outer roller with higher strength), the flow channel plate is compatible with the outer roller, so that the radial supporting capacity of the outer roller with the same thickness can be greatly enhanced when the outer roller is subjected to finish machining, and under the same machining condition, the service life of the outer roller is prolonged. And the design thickness of the outer roller can be greatly reduced, so that the heat exchange efficiency of the heat exchange roller is improved. Meanwhile, the structure also avoids the influence of welding deformation of the runner plate on the heat exchange roller. The problem that the efficiency of the heat exchange roller cannot be improved by reducing the thickness of the outer roller of the heat exchange roller is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of film production, and more specifically, to a heat exchange roller. Background Art

[0002] Existing film production lines often use heat exchange rollers to cool or heat films. These rollers typically consist of an inner roller, an outer roller, a flow channel plate, a shaft head, and a fluid pipe. Fluid flows through the flow channel throughout the roller, cooling or heating the outer roller, thereby cooling or heating the film on the outer roller. Therefore, improving the heat exchange efficiency of the heat exchange rollers directly increases the speed and uniformity of film cooling or heating, thereby improving production line efficiency and quality.

[0003] According to the heat transfer method of the heat exchange roller, the heat transfer efficiency of the heat exchange roller is related to many factors, such as fluid flow rate, fluid velocity, flow channel design, roller material thickness, etc. Among them, the smaller the thickness of the outer roller, the higher the heat transfer efficiency of the heat exchange roller.

[0004] like Figure 1 As shown, using a double-helix annular flow channel structure as an example, the existing heat exchange roller manufacturing method first welds or directly machines the flow channel plate and inner roller into a single unit, then inserts the outer roller via shrink or cold-sleeve assembly to form a closed flow channel. Because the film directly contacts the outer roller, very high requirements for cylindricity, runout, and roughness are typically imposed on the outer roller surface to avoid damaging the film and maintain parallelism during film flow. Therefore, after the outer roller is assembled with the flow channel plate and inner roller, the outer roller, including the shaft head, requires further processing, which may involve turning, grinding, and other processes. This requires the outer roller to have a certain radial load capacity. Furthermore, because the outer roller is in close contact with the flow channel plate and the flow channel surface is uneven, the force applied to the entire outer roller surface is uneven. Protruding areas of the flow channel are supported, while recessed areas are not. This results in uneven force on the outer roller during processing, which can easily cause deformation and compromise precision. Therefore, in order to ensure the processing accuracy of the heat exchange roller and increase the radial bearing capacity of the outer roller, the thickness of the outer roller of the heat exchange roller is generally not very thin.

[0005] Therefore, how to provide a heat exchange roller that can reduce the thickness of the outer roller has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0006] The utility model aims to provide a heat exchange roller whose outer roller can be made relatively thin to improve the heat exchange efficiency.

[0007] The utility model provides a heat exchange roller, comprising an outer roller and an inner roller, wherein the outer roller is coaxially arranged on the outer periphery of the inner roller;

[0008] A flow channel is processed on the wall of the outer roller, and a support structure is formed between two adjacent flow channels, and the support structure abuts against the outer peripheral surface of the inner roller.

[0009] Optionally, the flow channel comprises a groove recessed in the inner surface of the wall of the outer roller;

[0010] The outer circumference of the inner roller abuts against the support structure, and the outer circumference of the inner roller seals the notch of the groove to form a flow channel.

[0011] Optionally, the groove includes a groove bottom and a vertical surface, and there is an arc transition between the groove bottom and the vertical surface.

[0012] Optionally, the flow channel includes a straight flow channel, the straight flow channel extends along the axial direction of the outer roller, and the plurality of straight flow channels are evenly arranged in the circumferential direction of the outer roller;

[0013] Alternatively, the flow channel includes a single spiral flow channel, the single spiral flow channel spirally extending between two axial sides of the outer roller, and a plurality of single spiral flow channels are evenly arranged in the circumferential direction of the outer roller;

[0014] Alternatively, the flow channel includes a double helical flow channel, the double helical flow channel spirally extends between two axial sides of the outer roller, and a plurality of double helical flow channels are evenly arranged in the circumferential direction of the outer roller.

[0015] Optionally, the outer roller is mounted on the outer periphery of the inner roller by heat-fitting or cold-fitting.

[0016] Optionally, the heat exchange roller further includes two shaft heads respectively connected to the axial ends of the outer roller.

[0017] Optionally, the heat exchange roller further includes a liquid pipe, the liquid pipe includes a liquid inlet channel and a liquid outlet channel, the liquid pipe is coaxially arranged inside the shaft head, and the liquid inlet channel and the liquid outlet channel are respectively communicated with the flow channel.

[0018] According to the technical content disclosed in this utility model, the following beneficial effects are achieved:

[0019] The heat exchange roller provided by the present invention comprises an outer roller and an inner roller, the outer roller being coaxially arranged around the outer periphery of the inner roller. A flow channel is machined into the outer roller's wall, with a support structure formed between adjacent flow channels. The support structure abuts the outer periphery of the inner roller. This demonstrates that the present invention employs a solution in which the flow channel is machined directly into the outer roller, forming an integral structure with the outer roller. This flow channel can then be attached to the inner roller via either hot or cold mounting to form a closed annular flow channel, thus meeting the requirements for the heat exchange roller. This utility model integrates the flow channel plate onto the outer roller without reducing the cross-sectional area of ​​the fluid flow channel or increasing the material cost of the outer roller (without replacing the outer roller with a higher-strength material). During fine machining of the outer roller, this significantly enhances the radial support capacity of the outer roller at the same thickness. Specifically, a solid support structure is formed between two adjacent flow channels. The thickness of the support structure is equal to the outer roller wall thickness before the flow channels are machined, while the outer roller wall thickness at the flow channel is equal to the thickness of the support structure minus the flow channel depth. Therefore, the thinner outer roller wall thickness at the flow channel improves heat exchange efficiency, while the thicker outer roller wall thickness at the support structure increases outer roller rigidity. This structure also prevents the effects of flow channel plate welding deformation on the heat exchange roller. Furthermore, for guide rollers, when tension is constant, the smaller the wall thickness, the better the guide roller's followability. Therefore, the technical solution of this utility model can also improve the followability of heat exchange rollers with guiding functions.

[0020] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0022] Figure 1 This is a structural diagram of the heat exchange roller in the background technology of this utility model.

[0023] Figure 2 This is a partial cross-sectional view of the heat exchange roller of the present invention.

[0024] Figure 3 This is an axial cross-sectional view of the heat exchange roller of the present invention.

[0025] Figure 4 This is a radial cross-sectional view of the heat exchange roller of the present invention.

[0026] Explanation of the accompanying symbols: 1. outer roller; 11. groove bottom; 12. vertical surface; 2. flow channel; 3. inner roller; 4. liquid pipe; 5. shaft head. DETAILED DESCRIPTION

[0027] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0028] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0029] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0030] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0031] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0032] The heat exchange rollers used in film production lines often need to achieve higher heat transfer efficiency to achieve rapid cooling or heating of the film and energy conservation. In order to ensure the processing accuracy of the outer roller of the heat exchange roller due to uneven force, the existing heat exchange roller processing and manufacturing structure cannot meet the problem. The thickness of the designed outer roller cannot be further reduced, resulting in the heat transfer efficiency of the heat exchange roller cannot be further improved.

[0033] The utility model improves the heat transfer efficiency of the heat exchange roller by optimizing the processing and manufacturing structure of the heat exchange roller. Figures 2 to 4 The utility model discloses a heat exchange roller. A flow channel 2 with rounded corners is directly processed on the outer roller 1, and then it is fitted with the inner roller 3 through hot or cold installation to form a closed annular flow channel. The shaft head and outer circle of the heat exchange roller are then processed as a whole to meet the use requirements of the heat exchange roller.

[0034] More specifically, the heat exchange roller comprises an outer roller 1 and an inner roller 3. The inner wall of the outer roller 1 is machined with a groove recessed into the inner surface of the outer roller 1. The groove comprises a groove bottom 11 and a vertical surface 12, with a circular arc (radius) transition between the groove bottom 11 and the vertical surface 12. Multiple grooves are evenly arranged in sequence along the circumference of the outer roller 1, with a support structure formed between adjacent grooves. The outer roller 1 is coaxially arranged around the outer periphery of the inner roller 3 and is fitted onto the outer periphery of the inner roller 3 via shrink-fit or cold-fitting. The outer periphery of the inner roller 3 abuts the support structure, and the outer periphery of the inner roller 3 seals the notch of the groove, forming a closed annular flow channel.

[0035] The heat exchange roller also includes two shaft heads 5 connected to the axial ends of the outer roller 1, and a liquid pipe 4 provided at one axial end of the outer roller 1. The liquid pipe 4 is coaxially arranged inside the shaft head 5. The liquid pipe has two layers, one for the liquid inlet channel for introducing liquid into the flow channel, and one for the liquid outlet channel for discharging liquid from the flow channel, so as to realize the flow of liquid in the flow channel. One end of the two liquid pipes 4 is connected to the opposite ends of the flow channel 2.

[0036] Furthermore, in some embodiments, the flow channel 2 includes a straight flow channel 2 , the straight flow channel 2 extends along the axial direction of the outer roller 1 , and a plurality of straight flow channels 2 are evenly arranged in the circumferential direction of the outer roller 1 .

[0037] Furthermore, in some embodiments, the flow channel 2 includes a single spiral flow channel 2 , which spirally extends between the axial sides of the outer roller 1 , and multiple single spiral flow channels 2 are evenly arranged in the circumferential direction of the outer roller 1 .

[0038] Furthermore, in some embodiments, the flow channel 2 includes a double-helix flow channel 2 , which spirally extends between the axial sides of the outer roller 1 , and multiple double-helix flow channels 2 are evenly arranged in the circumferential direction of the outer roller 1 .

[0039] In summary, the heat exchange roller provided by the present invention optimizes the structure and processing method of the inner roller, flow channel and outer roller of the heat exchange roller, thereby reducing the thickness of the outer roller while ensuring the processing accuracy of the heat exchange roller, thereby further improving the heat exchange efficiency of the heat exchange roller.

[0040] This utility model integrates the flow channel plate onto the outer roller without reducing the cross-sectional area of ​​the fluid flow channel or increasing the material cost of the outer roller (without replacing the outer roller with a higher-strength material). During fine machining of the outer roller, this significantly enhances the radial support capacity of the outer roller at the same thickness. The rounded corners of the flow channel also reduce stress concentration. Thus, under the same machining conditions, the design thickness of the outer roller can be significantly reduced, thereby improving the heat exchange efficiency of the heat exchange roller. This structure also avoids the effects of flow channel plate welding deformation on the heat exchange roller. This solves the problem of being unable to increase the efficiency of the heat exchange roller by reducing the thickness of the outer roller, which is of great significance to improving the heat exchange efficiency of the heat exchange roller.

[0041] Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art will appreciate that the above examples are for illustration only and are not intended to limit the scope of the present invention. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A heat exchange roller, characterized in that: include: An outer roller and an inner roller, wherein the outer roller is coaxially arranged on the outer periphery of the inner roller; A flow channel is processed on the wall of the outer roller, and a support structure is formed between two adjacent flow channels, and the support structure abuts against the outer peripheral surface of the inner roller.

2. The heat exchange roller according to claim 1, characterized in that: The flow channel includes a groove recessed in the inner surface of the cylinder wall of the outer roller; The outer circumference of the inner roller abuts against the support structure, and the outer circumference of the inner roller seals the notch of the groove to form the flow channel.

3. The heat exchange roller according to claim 2, characterized in that: The groove comprises a groove bottom and a vertical surface, and there is an arc transition between the groove bottom and the vertical surface.

4. The heat exchange roller according to any one of claims 1 to 3, characterized in that: The flow channel includes a direct flow channel, the direct flow channel extends along the axial direction of the outer roller, and a plurality of direct flow channels are evenly arranged in the circumferential direction of the outer roller; Alternatively, the flow channel comprises a single spiral flow channel, the single spiral flow channel spirally extending between two axial sides of the outer roller, and a plurality of the single spiral flow channels are evenly arranged in the circumferential direction of the outer roller; Alternatively, the flow channel includes a double-helix flow channel, the double-helix flow channel spirally extends between the axial sides of the outer roller, and a plurality of the double-helix flow channels are evenly arranged in the circumferential direction of the outer roller.

5. The heat exchange roller according to any one of claims 1 to 3, characterized in that: The outer roller is mounted on the outer periphery of the inner roller by heat-fitting or cold-fitting.

6. The heat exchange roller according to any one of claims 1 to 3, characterized in that: The heat exchange roller further includes two shaft heads respectively connected to the axial ends of the outer roller.

7. The heat exchange roller according to claim 6, characterized in that: The heat exchange roller further includes a liquid pipe, which includes a liquid inlet channel and a liquid outlet channel. The liquid pipe is coaxially arranged inside the shaft head, and the liquid inlet channel and the liquid outlet channel are respectively communicated with each other.

Images