Static pressure box capable of discharging air transversely and uniformly
By designing a long, narrow box and a square tube structure, combined with wind resistance plates and ventilation slots, the problems of uneven airflow and circumferential flow at the static pressure box were solved, achieving uniform wind speed on the membrane surface and improving production quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-08
- Publication Date
- 2026-04-03
AI Technical Summary
The existing static pressure box has uneven horizontal airflow at the air outlet, resulting in uneven cooling of the membrane surface. Furthermore, the airflow caused by the baffle plate and round steel support creates defects on the membrane surface.
The design employs a long, narrow first box and square tube, combined with wind deflectors and ventilation slots to form a stable airflow channel. Airflow is distributed through the ventilation slots on the wind deflectors, avoiding the need for round steel supports and ensuring that the air is blown evenly onto the membrane.
This achieves uniform lateral wind speed on the thin film surface, reduces apparent defects, improves production quality and yield, and enhances energy efficiency.
Smart Images
Figure CN224074994U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cooling plastic molten casting technology, and in particular to a static pressure box with uniform horizontal air outlet. Background Technology
[0002] As a component that converts air kinetic energy into static pressure energy and back into air kinetic energy, the static plenum chamber primarily functions to stabilize airflow and distribute air volume laterally. In large-scale biaxially stretched film manufacturing production lines, the static plenum chamber evenly directs air from the fan across the film surface laterally, ensuring uniform heating or cooling of the film during production and guaranteeing product quality.
[0003] The existing static pressure box uses a baffle plate at the air outlet end to cut the originally continuous air outlet into an intermittent air outlet; in addition, in order to resist the deflection effect caused by the excessive length of the static pressure box, the existing static pressure box uses a simple sheet metal structure to make a slit, and sets a set of double-row round steel supports at intervals inside the slit air outlet.
[0004] However, the existing static pressure chamber structure has the following problems:
[0005] 1. Direct airflow from the air outlet baffle causes intermittent heat transfer to the film surface, resulting in uneven heating or cooling of the film surface.
[0006] 2. Because the double-row round steel support is located on the air outlet channel, it causes two consecutive cylindrical flow around the airflow at the slit outlet, resulting in surface defects on the membrane directly opposite the double-row round steel support. Utility Model Content
[0007] The purpose of this utility model is to provide a static pressure box with uniform horizontal airflow, so as to alleviate the technical problems existing in the prior art, such as uneven horizontal airflow from the air outlet, resulting in uneven cooling on the back of the film, and the direct intermittent blowing of air from the air outlet baffle and the flow around the round steel support, causing defects on the surface of the film.
[0008] The present invention provides a static pressure box with uniform horizontal air outlet, comprising: a first box body, a second box body, a wind resistance plate, and a ventilation slot;
[0009] The first box is long and narrow, with its top connected to the second box, and air inlets on both sides.
[0010] The second housing includes a square tube and a slit opening. The bottom opening of the square tube is connected to the first housing. The square tube is hollow, and the top opening of the square tube is a slit opening for blowing air onto the membrane. The wind resistance plate is fixed at the connection between the first housing and the second housing, and several ventilation slots are evenly opened on the surface of the wind resistance plate.
[0011] Furthermore, connecting plates are fixed to both sides of the first housing, and the surface of the connecting plates has openings of the same size as the air inlets on both sides of the first housing.
[0012] Furthermore, a rubber sealing gasket is provided on the outer periphery of the opening of the connecting plate.
[0013] Furthermore, the ventilation slots are rectangular, and the distance between two adjacent ventilation slots is 100mm to 150mm.
[0014] Furthermore, the bottom of the first housing is provided with a first guide plate and a second guide plate, which are arranged symmetrically at the center, and the tilt angle of the first guide plate and the second guide plate is 8° to 10°.
[0015] Furthermore, a slot is provided at the bottom of the first housing near the air outlet, and an airflow regulating valve is inserted into the slot.
[0016] Furthermore, the first and second housings are integrally formed or fixedly connected.
[0017] Furthermore, the radial length of the first housing is not less than 8m.
[0018] Beneficial effects:
[0019] This utility model provides a static pressure box with uniform horizontal airflow, including a first box body that is elongated, the top of the first box body being connected to a second box body, and air inlets on both sides of the first box body; the second box body includes a square tube and a slit, the bottom opening of the square tube being connected to the first box body, the square tube being hollow, and the top of the square tube having a slit for blowing air onto a membrane; a wind resistance plate is fixed at the connection between the first box body and the second box body, and a plurality of ventilation slots are uniformly formed on the surface of the wind resistance plate.
[0020] The elongated shape increases the air outlet area. A wind deflector is located at the connection between the first and second chambers; the ventilation slots on it evenly distribute airflow, preventing excessive or insufficient airflow in certain areas. This ensures uniform lateral velocity of the airflow blowing onto the membrane through the slits, improving the uniformity of heat transfer on the membrane surface and reducing surface defects. The first chamber connects to the second chamber at the top, while the bottom opening of the square tube connects to the first chamber, creating a stable airflow channel. The hollow design of the square tube reduces the weight of the static pressure chamber, and combined with the slit design, ensures that the blown air acts evenly on the membrane, meeting the high requirements of production processes for wind speed uniformity.
[0021] In addition, by replacing the traditional sheet metal structure with square tubes, the need for round steel supports is eliminated, which avoids the occurrence of two consecutive air cylinders flowing around the double-row round steel supports, resulting in defects on the film surface at the location directly opposite the double-row round steel supports. Attached Figure Description
[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0023] Figure 1 A schematic diagram of the structure of a static pressure box with uniform horizontal air outlet provided in an embodiment of this utility model;
[0024] Figure 2 A schematic diagram of the internal structure of a static pressure box with horizontally uniform air outlet provided for an embodiment of this utility model;
[0025] Figure 3 A schematic diagram of the wind resistance plate in a static pressure box with horizontally uniform air outlet provided in an embodiment of this utility model;
[0026] Figure 4 A diagram showing the lateral wind speed at the outlet of a static pressure box with uniform lateral airflow, provided as an embodiment of this utility model.
[0027] Icons: 1 - First housing; 101 - First guide vane; 102 - Second guide vane; 2 - Second housing; 201 - Square tube; 202 - Slit opening; 3 - Wind resistance plate; 4 - Ventilation slot; 5 - Connecting plate; 7 - Air volume regulating valve. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0032] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0033] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0034] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0035] like Figure 1 , Figure 2 As shown, this utility model embodiment provides a static pressure box with uniform horizontal air outlet, including: a first box body 1, a second box body 2, a wind resistance plate 3, and a ventilation slot 4;
[0036] The first housing 1 is elongated, and its top end is connected to the second housing 2. The two sides of the first housing 1 are air inlets. The second housing 2 includes a square tube 201 and a slit 202. The bottom opening of the square tube 201 is connected to the first housing 1. The square tube 201 is hollow, and the top end of the square tube 201 has a slit 202 for blowing air onto the membrane. The wind deflector 3 is fixed at the connection between the first housing 1 and the second housing 2. Several ventilation slots 4 are evenly distributed on the surface of the wind deflector 3.
[0037] Specifically, the first chamber 1 has openings on both the left and right sides, and is directly connected to the second chamber 2 at the top. The first chamber is elongated, and its length is typically no less than 8 meters, depending on the requirements of a large-scale biaxially stretched film manufacturing production line, to ensure effective distribution of airflow to the film in the lateral direction. Air inlets are provided on both sides of the first chamber 1, which are connected to an air distributor for drawing air into the static pressure chamber.
[0038] The second chamber 2 includes a square tube 201 and a slit 202. The square tube 201 is a hollow structure with a square cross-section, and its side length can be adjusted according to the overall air volume and air pressure of the static pressure chamber. The square tube 201 has a uniform wall thickness and is made of high-strength, corrosion-resistant metal materials, such as stainless steel 304, to ensure that it will not be damaged by airflow erosion or corrosion during long-term use. The bottom opening of the square tube 201 is connected to the top of the first chamber 1, and the connection is made by welding or integral molding to ensure a tight connection and prevent airflow leakage. A slit 202 is provided at the top of the square tube 201. The opening of the slit 202 is determined after precise calculation and flow simulation, and its length is adapted to the width of the membrane to achieve uniform airflow to the membrane surface.
[0039] The wind resistance plate 3 is fixed at the connection between the first housing 1 and the second housing 2, and is integrally formed between the two. The wind resistance plate 3 has a flat structure, and its material is the same as that of the first and second housings. Several ventilation slots 4 are evenly opened on the surface of the wind resistance plate 3, and the ventilation slots 4 are rectangular or circular in shape.
[0040] The elongated shape of the first chamber 1 and the side-intake design allow airflow to enter the chamber evenly from both sides. The evenly distributed ventilation slots 4 on the wind deflector 3 provide initial diversion and rectification of the incoming airflow, preventing concentration and turbulence. After adjustment by the wind deflector 3, the airflow becomes more uniform as it enters the square tube 201 of the second chamber 2. Finally, when it exits through the slit 202, it forms a uniform lateral wind speed distribution on the film surface, solving the problem of surface defects caused by uneven airflow in existing technologies and improving the production quality of the film.
[0041] By utilizing the combined structure of square tube 201, wind resistance plate 3, and ventilation slot 4, the existing air outlet baffle plate directly blows air, and due to its long length, it requires double rows of round steel supports. The round steel supports must be located on the air outlet flow channel, which causes two consecutive cylindrical flow around the air at the slit outlet, thereby achieving the purpose of uniform air outlet.
[0042] In an embodiment of this utility model, connecting plates 5 are fixedly connected to both sides of the first housing 1, and the surface of the connecting plates 5 has openings of the same size as the air inlets on both sides of the first housing 1.
[0043] A rubber sealing gasket is provided on the outer periphery of the opening of the connecting plate 5.
[0044] The ventilation slot 4 is rectangular or round, and the distance between two adjacent ventilation slots 4 is 100mm to 150mm.
[0045] Specifically, such as Figure 3 As shown, two connecting plates 5 are bolted or integrally formed at the air inlets on both sides of the first housing 1. The connecting plates 5 are used for flange connection with the air distributor, ensuring they can withstand high wind pressure without separation. The connecting plates 5 are flat and made of the same material as the first housing 1. Correspondingly, the surface of the connecting plates 5 has openings that match the air inlets on both sides of the first housing 1, allowing airflow to smoothly enter the air inlets of the first housing 1 from the openings of the connecting plates 5. Rubber sealing gaskets are provided around the outer periphery of the openings of the connecting plates 5. The rubber sealing gaskets fit tightly against the edges of the openings of the connecting plates 5, providing good elasticity and sealing performance. They effectively fill the small gaps at the connection between the connecting plates 5 and the air inlet pipe, preventing airflow leakage. The connecting plates 5 provide a flat and easy-to-connect interface for the air inlets, facilitating connection to external air inlet pipes or equipment. The rubber sealing gaskets improve the sealing performance at the air inlets. When the plenum chamber is in operation, there is a certain amount of internal air pressure. If the air inlet is not sealed properly, air leakage will occur, which will not only reduce the working efficiency of the plenum chamber but may also generate noise. The rubber sealing gasket can prevent this from happening, ensuring that all the incoming airflow can enter the first chamber 1, improving energy utilization efficiency and reducing noise pollution.
[0046] The distance between two adjacent ventilation slots 4 is 100mm to 150mm. During actual manufacturing, this distance can be adjusted within this range according to the specific dimensions of the first chamber 1 and the airflow distribution to ensure uniform airflow regulation. This allows for a uniform airflow distribution when the air passes through the ventilation slots 4. Too large a distance will increase airflow resistance and reduce the ventilation efficiency of the plenum chamber; too small a distance may result in uneven airflow distribution on the wind resistance plate 3, affecting the uniformity of airflow within the second chamber 2.
[0047] In an embodiment of this utility model, a first guide plate 101 and a second guide plate 102 are provided at the bottom of the first housing 1. The first guide plate 101 and the second guide plate 102 are arranged in a centrally symmetrical manner, and the inclination angle of the first guide plate 101 and the second guide plate 102 is 8° to 10°.
[0048] The bottom of the first housing 1 near the air outlet is also provided with a slot, into which an air volume regulating valve 7 is inserted.
[0049] Specifically, a first guide plate 101 and a second guide plate 102 are provided at the bottom of the first housing 1, arranged symmetrically at the center, ensuring good symmetry and uniformity of airflow entering from both sides at the bottom of the first housing 1. Both the first guide plate 101 and the second guide plate 102 are flat structures, fixed at an inclination angle of 8° to 10°. The inclination angle is the angle between the bottom surface of the first guide plate 101 or the second guide plate 102 and the bottom surface of the first housing 1 when the first housing 1 is placed horizontally parallel to the ground. An excessively large inclination angle results in excessive airflow resistance, while an excessively small angle fails to effectively guide the airflow. The edges of the guide plates are smoothed to avoid disturbing the airflow. The inclination angle effectively guides the airflow entering the first housing 1. When the airflow enters the first housing 1 from the side inlets, it can flow smoothly towards the second housing 2, reducing eddies and turbulence at the bottom of the first housing 1.
[0050] A slot is provided at the bottom of the first housing 1 near the air outlet, and the air volume regulating valve 7 is inserted into the slot. The air volume regulating valve 7 consists of two rectangular flat plates, one of which is a stationary plate and the other is a movable plate, which is in the shape of a louvered grille and has the function of regulating and distributing air volume.
[0051] In the embodiments of this utility model, the first box 1 and the second box 2 are integrally formed or fixedly connected.
[0052] The radial length of the first box 1 shall not be less than 8m.
[0053] Specifically, the connection between the first housing 1 and the second housing 2 can be either integrally formed or fixedly connected. If integrally formed, the first housing 1 and the second housing are manufactured into a complete, seamless structure. This ensures a smooth transition between the two housings, eliminating gaps and improving airtightness, thus guaranteeing smooth airflow within the housing. If a fixed connection is used...
[0054] The radial length of the first chamber 1 is not less than 8m. This is because, in a large-scale biaxially stretched film manufacturing production line, the static pressure chamber allows for fully developed airflow over long distances, reducing the problem of uneven wind speed caused by local airflow differences. This helps the wind deflector plate better regulate the airflow, ensuring that the air ultimately blown out from the slit 202 maintains a uniform lateral wind speed across a wide area, thereby preventing surface defects in the film due to uneven wind speed and improving the yield rate of film production.
[0055] Based on the above embodiments, the working process of the static pressure box with uniform horizontal air outlet provided by this utility model is as follows:
[0056] The airflow generated by the fan is connected to the connecting plate 5 via an air distributor, and the air enters through the air inlets on both sides of the first housing 1. The airflow entering the first housing 1 is regulated by the airflow regulating valve 7 and then guided by the first guide plate 101 and the second guide plate 102. This allows the airflow to flow towards the second housing 2. The airflow reaches the wind resistance plate 3 at the connection between the first and second housings 1 and 2. The ventilation slot 4 divides and rectifies the airflow, preventing it from concentrating or becoming turbulent, and ensuring that the airflow enters the square tube 201 of the second housing 2 evenly. The air blown out of the square tube 201 from the slit opening 202 acts evenly on the membrane surface.
[0057] like Figure 4 As shown, the air velocity of a static pressure box with uniform horizontal air outlet according to this utility model was measured at different length positions, and it was found that the fluctuation was minimal and the air outlet was uniform at all positions.
[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A static pressure box for uniform air outflow in the lateral direction, characterized by, The utility model relates to a static pressure box of transverse uniform air outlet, which comprises a first box (1), a second box (2), a wind resistance plate (3) and a ventilation groove (4). The first box (1) is long strip shape, the top end of first box (1) is communicated with second box (2), and the two sides of first box (1) are air inlet; The second box (2) comprises a square tube (201) and a slit (202), the bottom end opening of square tube (201) is communicated with first box (1), the square tube is hollow, the top end of square tube (201) is provided with slit (202), and slit (202) is used for blowing air to film; the wind resistance plate is fixed at the connecting portion of first box (1) and second box (2), and a plurality of ventilation grooves (4) are uniformly arranged on the surface of wind resistance plate (3).
2. The static pressure box of transverse uniform air outlet according to claim 1, wherein the two sides of the first box (1) are fixedly connected with a connecting plate (5), and the surface of the connecting plate (5) is provided with openings with the same size as the air inlets on the two sides of the first box (1).
3. The static pressure box of transverse uniform air outlet according to claim 2, wherein the outer periphery of the opening of the connecting plate (5) is provided with a rubber sealing gasket.
4. The static pressure box of transverse uniform air outlet according to claim 1, wherein the ventilation grooves (4) are rectangular, and the spacing between two adjacent ventilation grooves (4) is 100mm-150mm.
5. The static pressure box of transverse uniform air outlet according to claim 1, wherein the bottom of the first box (1) is provided with a first flow guide plate (101) and a second flow guide plate (102), the first flow guide plate (101) and the second flow guide plate (102) are centrally symmetrically arranged, and the inclination angle of the first flow guide plate (101) and the second flow guide plate (102) is 8°-10°.
6. The static pressure box of transverse uniform air outlet according to claim 1, wherein the bottom end of the first box (1) close to the air outlet is further provided with a slot, and a wind volume adjusting valve (7) is inserted into the slot.
7. The static pressure box of transverse uniform air outlet according to claim 1, wherein the first box (1) and the second box (2) are integrally formed or fixedly connected.
8. The static pressure box of transverse uniform air outlet according to claim 1, wherein the radial length of the first box (1) is not less than 8m.