Double-air-opening air ring of film blowing machine

Abstract

The utility model provides a double-air-port air ring of a film blowing machine. The double-air-port air ring comprises a base plate, a lower air uniformizing ring, an inner air outlet ring, a ventilation ring, an upper air uniformizing ring, an outer air outlet ring and an upper air blocking ring assembly. The upper end face of the lower air uniformizing ring is provided with flow guide pieces which are evenly distributed at intervals in the circumferential direction, air circulation passages are formed between the flow guide pieces, and the upper portions make contact with the upper air uniformizing ring. The flow guide piece forms a V-shaped air inlet and outlet passage through symmetrically-distributed conical bodies, and the airflow uniformity is enhanced. The guide block is inserted into the positioning ring groove of the upper air uniformizing ring to ensure the stability of the flow guide piece. The design effectively guides airflow, reduces turbulent flow, and improves the film bubble cooling effect and the film quality.

Description

Technical Field

[0001] This utility model specifically relates to a dual-outlet air ring for a blown film machine. Background Technology

[0002] In a blown film machine, the air ring is one of the key components, its main function being to cool the film bubble that is extruded and inflated from the die. The cooling airflow from the air ring is a 360-degree annular airflow that blows onto the film bubble to cool it. Whether the airflow from the air ring is stable and uniform directly affects the stretching of the film bubble and the quality of the film.

[0003] For example, document CN217597804U discloses a dual-air-nozzle air ring system for a blown film machine, which mainly consists of a chassis, an air distribution element, a first ring body, and a second ring body. Gas flow is achieved by setting circular air distribution holes on the upper and lower air distribution rings. However, in practical applications, local turbulence or unevenness still occurs when the airflow passes through the circular air distribution holes, leading to uneven cooling of the film bubble. Utility Model Content

[0004] The technical problem to be solved by this utility model is to address the shortcomings of the prior art by providing a dual-air-outlet air ring for a blown film machine. Through the guidance of the guide component, the airflow is smoother when passing through the gas flow channel, avoiding the problem of excessively strong or weak local airflow, thereby improving the cooling effect of the film bubble and the film quality.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dual-outlet air ring for a blown film machine, comprising a chassis and a lower air distribution ring sealed to the outer edge of the chassis; an inner air outlet ring is provided above the chassis; a ventilation ring is sealed to the outer edge of the lower air distribution ring; an upper air distribution ring is sealed to the inner edge of the ventilation ring; the upper air distribution ring is distributed above the lower air distribution ring with an air inlet gap between them; several sets of air inlets are evenly distributed around the outer circumference of the ventilation ring; and an outer air outlet ring is provided above the inner air outlet ring. There is a first air outlet gap between the outer air outlet ring and the inner air outlet ring, and a second air outlet gap between the chassis and the inner air outlet ring. The outer edge of the inner air outlet ring is provided with several sets of ventilation holes. An upper windbreak ring assembly is provided between the outer edge of the outer air outlet ring and the inner edge of the upper wind distribution ring. The lower wind distribution ring is characterized in that: the upper end face of the lower wind distribution ring is provided with several sets of guide members evenly spaced along the circumference, and there is a gas flow passage between each two adjacent sets of guide members. The upper part of the guide member is in contact with the lower end face of the upper wind distribution ring.

[0006] The design of the flow guide effectively directs airflow, reduces turbulence, and makes the airflow more stable and uniformly distributed. Guided by the flow guide, the airflow passes more smoothly through the gas flow channel, avoiding problems of excessively strong or weak local airflow, thereby improving the cooling effect of the membrane bubble and the quality of the thin film.

[0007] This application can be further configured as follows: the guide includes two sets of first cones and second cones that are symmetrically distributed and are both conical. The large end of the first cone is connected to the large end of the second cone. A V-shaped air inlet passage is formed between each pair of adjacent first cones, and a V-shaped air outlet passage is formed between each pair of adjacent second cones. The V-shaped air inlet passage and the V-shaped air outlet passage are interconnected and together form a gas flow passage.

[0008] The V-shaped air inlet and outlet channels ensure more uniform airflow during entry and exit, reducing turbulence and unevenness. This structure not only improves airflow uniformity but also enhances the cooling effect of the air ring.

[0009] This application can be further configured such that: the flow guide further includes a guide block, the guide block is distributed between the first cone and the second cone and is located above the first cone and the second cone, the lower end face of the upper air distribution ring is provided with a positioning ring groove corresponding to the guide block, and several sets of guide blocks are inserted into the positioning ring groove.

[0010] Through the cooperation of the guide block and the positioning ring groove, the lower air distribution ring remains stable during the installation and positioning process, avoiding the problem of uneven airflow caused by the positional deviation of the lower air distribution ring, and further improving the cooling effect of the air ring and the film quality.

[0011] This application can be further configured such that: a limiting mechanism is provided between the upper air distribution ring and the ventilation ring, the limiting mechanism includes a limiting block, one end of the limiting block is pressed above the inner edge of the ventilation ring, and the other end of the limiting block is detachably connected to a threaded connector, the lower end of the threaded connector being detachably connected to the outer edge of the upper air distribution ring.

[0012] With the cooperation of the limiting block and the threaded connector, the positional relationship between the upper air distribution ring and the ventilation ring is more secure, avoiding the problem of uneven airflow caused by positional deviation, and further improving the cooling effect of the air ring and the film quality.

[0013] This application can be further configured such that: the upper windshield ring assembly includes a first windshield ring and a second windshield ring, the outer edge of the first windshield ring is sealed to the inner edge of the upper windshield ring, the inner edge of the first windshield ring is sealed to the outer edge of the second windshield ring, and the inner edge of the second windshield ring is sealed to the outer edge of the outer windshield ring.

[0014] The first and second windshield rings work together to enhance the overall structural strength of the air ring, making it more stable when high-speed airflow passes through. By enhancing structural strength, the air ring can maintain good performance during long-term use and reduce airflow unevenness caused by structural deformation.

[0015] This application can be further configured as follows: a support ring is provided between the second windshield ring and the outgoing windshield ring; a mounting flange ring is provided above the second windshield ring and near the outer edge of the second windshield ring; the outer circumferential surface of the support ring is sealed to the inner circumferential surface of the mounting flange ring; and a deformation gap exists between the outer circumferential surface of the outgoing windshield ring and the inner circumferential surface of the support ring.

[0016] The sealed connection between the support ring and the mounting flange ring ensures more uniform airflow as it passes through the air ring, preventing issues such as excessively strong or weak local airflow. The deformation gap design allows for slight deformation of the outgoing air ring within a certain range, while the support ring protects the outgoing air ring from excessive deformation.

[0017] This application can be further configured such that: the outer periphery of the first windshield ring, the second windshield ring, and the outward windshield ring are each connected to a support column protruding outward.

[0018] The main function of the support column is to facilitate the clamping of the first windshield ring, the second windshield ring, and the outward windshield ring during the installation process.

[0019] The beneficial effects of this invention are as follows: By incorporating features such as a flow guide, guide block, limiting mechanism, upper windshield ring assembly, support ring, mounting flange ring, and support column into the air distribution component, the problems of uneven airflow distribution and complex structure in existing technologies are effectively solved. This not only improves the cooling effect and film quality of the membrane bubble but also simplifies the structure of the air ring and reduces costs.

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0022] Figure 2 This is a top view schematic diagram of an embodiment of the present utility model;

[0023] Figure 3 This is a cross-sectional schematic diagram of an embodiment of the present utility model;

[0024] Figure 4 for Figure 3 Enlarged view of a portion of point B in the middle;

[0025] Figure 5 for Figure 3 Enlarged view of a portion of point A in the middle;

[0026] Figure 6 This is a schematic diagram of the inner air outlet ring according to an embodiment of the present utility model;

[0027] Figure 7 This is a schematic diagram of the lower air distribution ring according to an embodiment of the present invention;

[0028] Figure 8 for Figure 7 A magnified view of a portion of point C in the middle. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] like Figures 1 to 8 The blown film machine shown has a dual-outlet air ring system, including a chassis 1 and a lower air distribution ring 2 sealed to the outer edge of the chassis 1. An inner air outlet ring 4 is located above the chassis 1. A ventilation ring 5 is sealed to the outer edge of the lower air distribution ring 2, and an upper air distribution ring 6 is sealed to the inner edge of the ventilation ring 5. The upper air distribution ring 6 is located above the lower air distribution ring 2, and there is an air inlet gap 7 between them. Several sets of air inlets 5a are evenly distributed around the outer circumference of the ventilation ring 5. An outer air outlet ring 8 is located above the inner air outlet ring 4. The outer air outlet ring 8 and the inner air outlet ring 4 are connected... A first air outlet gap 9 exists between the air rings 4, and a second air outlet gap 10 exists between the chassis 1 and the inner air outlet ring 4. Several sets of ventilation holes 4a are provided on the outer edge of the inner air outlet ring 4. An upper baffle ring assembly is provided between the outer edge of the outer air outlet ring 8 and the inner edge of the upper uniform air ring 6. Several sets of guide elements 2a are evenly spaced circumferentially on the upper end face of the lower uniform air ring 2. A gas flow channel exists between each pair of adjacent guide elements 2a, and the upper part of the guide element 2a contacts the lower end face of the upper uniform air ring 6. The design of the guide elements 2a effectively guides the airflow, reduces turbulence, and makes the airflow more stable and uniformly distributed. Guided by the guide elements 2a, the airflow is smoother when passing through the gas flow channel, avoiding the problem of excessively strong or weak local airflow, thereby improving the cooling effect of the membrane bubble and the membrane quality.

[0031] The airflow guide 2a includes two sets of symmetrically distributed, conical first cones 2b and 2c. The large ends of the first cones 2b and 2c are connected. A V-shaped air inlet channel 2d is formed between each pair of adjacent sets of first cones 2b, and a V-shaped air outlet channel 2e is formed between each pair of adjacent sets of second cones 2c. The V-shaped air inlet channel 2d and V-shaped air outlet channel 2e are interconnected and together form the gas flow channel. The arrangement of the V-shaped air inlet channel 2d and V-shaped air outlet channel 2e makes the airflow more uniform during entry and exit, reducing turbulence and unevenness. This structure not only improves the uniformity of airflow but also enhances the cooling effect of the air ring.

[0032] The airflow guide 2a also includes guide blocks 2f, which are distributed between the first conical body 2b and the second conical body 2c and located above them. The lower end face of the upper airflow uniform ring 6 is provided with a positioning ring groove 6a corresponding to the guide blocks 2f, and several sets of guide blocks 2f are inserted into the positioning ring groove 6a. Through the cooperation of the guide blocks 2f and the positioning ring groove 6a, the lower airflow uniform ring 2 remains stable during installation and positioning, avoiding uneven airflow caused by the positional displacement of the lower airflow uniform ring 2, and further improving the cooling effect and film quality of the airflow ring.

[0033] A limiting mechanism is provided between the upper uniform air ring 6 and the ventilation ring 5. The limiting mechanism includes a limiting block 11, one end of which presses against the inner edge of the ventilation ring 5, and the other end of which is detachably connected to a threaded connector. The lower end of the threaded connector is detachably connected to the outer edge of the upper uniform air ring 6. Through the cooperation of the limiting block 11 and the threaded connector, the positional relationship between the upper uniform air ring 6 and the ventilation ring 5 is more secure, avoiding the problem of uneven airflow caused by positional misalignment, and further improving the cooling effect and film quality of the air ring.

[0034] The upper wind deflector assembly includes a first wind deflector ring 12 and a second wind deflector ring 13. The outer edge of the first wind deflector ring 12 is sealed to the inner edge of the upper air distribution ring 6, and the inner edge of the first wind deflector ring 12 is sealed to the outer edge of the second wind deflector ring 13. The inner edge of the second wind deflector ring 13 is sealed to the outer edge of the outer air distribution ring 8. The first wind deflector ring 12 and the second wind deflector ring 13 cooperate with each other to enhance the overall structural strength of the wind deflector ring, making it more stable when high-speed airflow passes through. By enhancing the structural strength, the wind deflector ring can maintain good performance during long-term use and reduce airflow unevenness caused by structural deformation.

[0035] A support ring 14 is provided between the second wind deflector ring 13 and the outlet air ring 8. A mounting flange ring 13a is located above the second wind deflector ring 13 and near its outer edge. The outer circumferential surface of the support ring 14 is sealed to the inner circumferential surface of the mounting flange ring 13a. A deformation gap 15 exists between the outer circumferential surface of the outlet air ring 8 and the inner circumferential surface of the support ring 14. Through the sealed connection between the support ring 14 and the mounting flange ring 13a, the airflow is more uniform as it passes through the air rings, avoiding problems of excessively strong or weak local airflow. The design of the deformation gap 15 allows the outlet air ring 8 to undergo slight deformation within a certain range, while the support ring 14 protects the outlet air ring 8 from excessive deformation.

[0036] The outer periphery of the first windshield ring 12, the second windshield ring 13, and the outward windshield ring 8 are each connected to a support column 16 protruding outward, which facilitates clamping the first windshield ring 12, the second windshield ring 13, and the outward windshield ring 8 during installation.

[0037] The airflow principle of this embodiment is as follows: several sets of air inlets 5a simultaneously introduce air, and the airflow passes through several sets of guide elements 2a (between the upper air distribution ring 6 and the lower air distribution ring 2), flows below the first wind baffle ring 12 and the second wind baffle ring 13, part of which enters the first air outlet gap 9 between the outer air outlet ring 8 and the inner air outlet ring 4, and the other part enters through the ventilation hole 4a and the second air outlet gap 10 between the chassis 1 and the inner air outlet ring 4. The first air outlet gap 9 and the second air outlet gap 10 simultaneously discharge air to cool the membrane.

Claims

1. A dual-outlet air ring for a blown film machine, comprising a chassis and a lower air distribution ring sealed to the outer edge of the chassis, an inner air outlet ring above the chassis, a ventilation ring sealed to the outer edge of the lower air distribution ring, an upper air distribution ring sealed to the inner edge of the ventilation ring, the upper air distribution ring being distributed above the lower air distribution ring with an air inlet gap between them, several sets of air inlets evenly distributed around the outer circumference of the ventilation ring, an outer air outlet ring above the inner air outlet ring, a first air outlet gap between the outer air outlet ring and the inner air outlet ring, a second air outlet gap between the chassis and the inner air outlet ring, several sets of ventilation holes on the outer edge of the inner air outlet ring, and an upper baffle ring assembly between the outer edge of the outer air outlet ring and the inner edge of the upper air distribution ring, characterized in that: The upper end face of the lower uniform air ring is provided with several groups of guide elements evenly spaced along the circumference. There is a gas flow passage between each two adjacent groups of guide elements. The upper part of the guide element is in contact with the lower end face of the upper uniform air ring.

2. The dual-outlet air ring of the blown film machine according to claim 1, characterized in that: The air guide includes two sets of first cones and second cones that are symmetrically distributed and are both conical. The large end of the first cone is connected to the large end of the second cone. A V-shaped air inlet passage is formed between each pair of adjacent first cones, and a V-shaped air outlet passage is formed between each pair of adjacent second cones. The V-shaped air inlet passage and the V-shaped air outlet passage are interconnected and together form a gas flow passage.

3. The dual-outlet air ring of the blown film machine according to claim 2, characterized in that: The flow guide also includes guide blocks, which are distributed between the first cone and the second cone and located above the first cone and the second cone. The lower end face of the upper air distribution ring is provided with a positioning ring groove corresponding to the guide block, and several sets of guide blocks are inserted into the positioning ring groove.

4. The dual-outlet air ring of the blown film machine according to any one of claims 1 to 3, characterized in that: A limiting mechanism is provided between the upper air distribution ring and the ventilation ring. The limiting mechanism includes a limiting block. One end of the limiting block presses against the inner edge of the ventilation ring, and the other end of the limiting block is detachably connected to a threaded connector. The lower end of the threaded connector is detachably connected to the outer edge of the upper air distribution ring.

5. The dual-outlet air ring of the blown film machine according to any one of claims 1 to 3, characterized in that: The upper wind deflector assembly includes a first wind deflector and a second wind deflector. The outer edge of the first wind deflector is sealed to the inner edge of the upper wind deflector, the inner edge of the first wind deflector is sealed to the outer edge of the second wind deflector, and the inner edge of the second wind deflector is sealed to the outer edge of the outer wind deflector.

6. The dual-outlet air ring of the blown film machine according to claim 5, characterized in that: A support ring is provided between the second wind deflector ring and the outgoing air deflector ring. A mounting flange ring is provided above the second wind deflector ring and near its outer edge. The outer circumferential surface of the support ring is sealed to the inner circumferential surface of the mounting flange ring. There is a deformation gap between the outer circumferential surface of the outgoing air deflector ring and the inner circumferential surface of the support ring.

7. The dual-outlet air ring of the blown film machine according to claim 6, characterized in that: The outer periphery of the first windshield ring, the second windshield ring, and the outward windshield ring are each connected to a support column that protrudes outward.

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