Kneader pressure relief device

Abstract

The utility model discloses a kind of kneader pressure relief devices in chemical production technical field, including cover, cover is equipped with pressure relief port, pressure relief mechanism is installed on pressure relief port, pressure relief mechanism includes first gland and second gland, the side of pressure relief port is rotatably connected with the side of first gland, the other side of pressure relief port is rotatably connected with the side of second gland, first gland and second gland are jointly covered in pressure relief port upper, and the self-locking structure is formed by the mutual overlap of the partial area of two, to close pressure relief port in normal state, when pressure relief, first gland and second gland rotate around its own rotation axis under the pressure effect inside kneader, to remove the closure of pressure relief port.The utility model solves the technical problem that the processing difficulty of prior art pressure relief device is big, cost is higher.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, and in particular to a pressure relief device for a kneader. Background Technology

[0002] The kneader is a crucial piece of equipment in the nitrocellulose production process. It uses a pair of cooperating and rotating blades to generate strong shearing action, cutting, squeezing, and kneading the nitrocellulose fibers. This allows the plasticizer to be fully absorbed by the fibers, increasing the plasticity of the nitrocellulose. During operation, any nitrocellulose not properly cleaned may ignite under prolonged mechanical force, potentially igniting the production material and causing a significant rise in internal temperature. As the pressure within the kneader increases, an explosion is possible.

[0003] Chinese utility model patent with publication number CN217802626U discloses a self-opening and closing cylinder cover for a kneader, including a cover body, a pressure gauge connected to the cover body for monitoring the internal pressure of the kneader body, a pressure relief valve connected to the cover body for releasing pressure within the kneader body, and a telescopic mechanism connected to the cover body for opening and closing the cover body.

[0004] Although the aforementioned patents provide certain safety features, the pressure relief valves they employ are typically complex in structure, have high manufacturing costs, and require strict processing techniques, making it difficult for manufacturers to produce or repair / replace them independently. This, to some extent, limits their widespread application and economic viability. Utility Model Content

[0005] To address the technical problems of high processing difficulty and high cost of existing pressure relief devices, this utility model provides a pressure relief device for a kneader.

[0006] The technical solution adopted by this utility model to solve its technical problem is: The pressure relief device for a kneader includes a cover with a pressure relief port. A pressure relief mechanism is installed on the pressure relief port. The pressure relief mechanism includes a first pressure cover and a second pressure cover. One side of the pressure relief port is rotatably connected to the side of the first pressure cover, and the other side of the pressure relief port is rotatably connected to the side of the second pressure cover. The first pressure cover and the second pressure cover together cover the pressure relief port, and some areas of the two overlap each other to form a self-locking structure to close the pressure relief port under normal conditions. When pressure is released, the first pressure cover and the second pressure cover rotate around their own rotation axis under the pressure inside the kneader to release the closure of the pressure relief port.

[0007] Furthermore, one side of the pressure relief port is rotatably connected to the side of the first pressure cap, and the other side of the pressure relief port is rotatably connected to the side of the second pressure cap. The rotation axis of the first pressure cap and the rotation axis of the second pressure cap are parallel to each other.

[0008] Furthermore, both the first and second pressure caps cover 55% to 65% of the open area of ​​the pressure relief port, and the overlap area between the first and second pressure caps accounts for 30% to 40% of the area of ​​the first pressure cap.

[0009] Furthermore, a first hinge is fixedly installed on one side of the pressure relief port, and the side of the pressure relief port is rotatably connected to the side of the first pressure cover through the first hinge. A second hinge is fixedly installed on the other side of the pressure relief port, and the other side of the pressure relief port is rotatably connected to the side of the second pressure cover through the second hinge.

[0010] Furthermore, the pressure relief port protrudes from the upper surface of the cover, with a protrusion height of 1 to 10 cm.

[0011] Furthermore, the pressure relief port is a square or round hole.

[0012] Furthermore, the thickness of the first and second glands is 1–3 mm.

[0013] Furthermore, the vertical projection area of ​​the pressure relief port on the upper surface of the cover accounts for 20% to 50% of the upper surface area of ​​the cover.

[0014] The beneficial effects of this utility model are: 1. The pressure relief mechanism of this utility model includes a first pressure cap and a second pressure cap, which are rotatably connected to both sides of the pressure relief port and form a self-locking structure by overlapping each other. Under normal conditions, the pressure relief port is closed. During pressure relief, the first and second pressure caps rotate around their own rotation axes under the pressure inside the kneader, thereby releasing the closure of the pressure relief port. This innovatively adopts an overlapping self-locking structure of the first and second pressure caps, eliminating the complex and expensive "pressure relief valve" used in existing technologies. This greatly simplifies the overall structure, significantly reduces manufacturing costs and processing difficulty, enabling manufacturers to easily achieve independent production and maintenance, and fundamentally solves the technical problems of high processing difficulty and high cost of existing pressure relief devices.

[0015] 2. The rotation axes of the first and second pressure plates are parallel to each other, ensuring that their opening trajectories are coordinated and smooth. When internal overpressure occurs, the first and second pressure plates can smoothly and oppositely rotate around their parallel axes to open, forming the largest pressure relief channel. This avoids problems such as motion interference, poor opening, or wear of the sealing surface that may be caused by non-parallel axes, further improving the reliability and effectiveness of this simple mechanism.

[0016] 3. Both the first and second pressure caps seal 55% to 65% of the open area of ​​the pressure relief port. The overlap area between the first and second pressure caps is limited to 30% to 40% of the area of ​​the first pressure cap. This design addresses both "sealing" and "sensitivity". Under this ratio, the first and second pressure caps can achieve a reliable seal under normal conditions by relying on their own weight and overlap friction to prevent leakage. When the pressure exceeds the limit, they can be opened in time, ensuring the sensitivity of the pressure relief response and giving the simple structure excellent performance.

[0017] 4. The pressure relief port protrudes from the upper surface of the cover, with a protrusion height of 1-10cm. This protruding structure extends the pressure relief port vertically, which not only directly ensures sufficient pressure relief flow area but, more importantly, forms a guiding "pressure boosting chamber." When the internal pressure increases, the airflow gathers in this chamber and acts vertically on the inner surfaces of the first and second pressure caps, generating a more concentrated opening force, thereby significantly improving the pressure relief response speed and release efficiency.

[0018] Enhanced anti-clogging capability: The raised design increases the actual outlet height of the pressure relief port, effectively preventing tumbling materials or splashing liquids inside the kneader from directly covering or clogging the pressure relief port sealing surface, ensuring the long-term reliability of the pressure relief device under harsh operating conditions. This simple structure simultaneously solves the problems of pressure relief area, sensitivity, and anti-clogging, demonstrating the ingenuity of the design.

[0019] 5. The vertical projection area of ​​the pressure relief port on the upper surface of the cover accounts for 20% to 50% of the upper surface area of ​​the cover, ensuring sufficient pressure relief area and enabling the rapid release of dangerous pressure to meet the safety requirements of the kneader. Attached Figure Description

[0020] Figure 1 This is a front view of the pressure relief device for the kneader of this utility model; Figure 2 This is a three-dimensional schematic diagram of the pressure relief device of the kneader of this utility model from one angle; Figure 3 This is a three-dimensional schematic diagram of the pressure relief device of the kneader of this utility model from another angle; The diagram is labeled as follows: 1-cover, 2-pressure relief port, 3-first pressure cap, 4-second pressure cap, 5-first hinge, 6-second hinge. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the present invention will be further described below with reference to the accompanying drawings.

[0022] First, it should be stated that the technical solutions of the embodiments of this application are clearly and completely described. The described embodiments are only some of the embodiments of this application, and not a limitation of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] In the description of this utility model, it should be understood that the terms "first", "second", "upper", "lower", "left", "right", "inner", "outer", "axial" or "radial" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and are not intended to indicate or imply that the device or element referred to must have a specific orientation structure and operation. Therefore, they should not be construed as limitations on this utility model.

[0024] It should be noted that, in this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Reference Figures 1 to 3 This utility model provides a pressure relief device for a kneader.

[0026] like Figures 1 to 3As shown, in some embodiments, a pressure relief device for a kneader is provided, including a cover 1 with a pressure relief port 2. A pressure relief mechanism is installed on the pressure relief port 2, which includes a first pressure cover 3 and a second pressure cover 4. One side of the pressure relief port 2 is rotatably connected to the side of the first pressure cover 3, and the other side of the pressure relief port 2 is rotatably connected to the side of the second pressure cover 4. The first pressure cover 3 and the second pressure cover 4 together cover the pressure relief port 2, and some areas of the two overlap each other to form a self-locking structure, so as to close the pressure relief port 2 under normal conditions. The self-locking is formed by the gravity of the overlap, which eliminates the need for additional locking buckles. The first pressure cover 3 and the second pressure cover 4 can also provide counterweight. When depressurizing, the first pressure cover 3 and the second pressure cover 4 rotate around their own rotation axis under the pressure inside the kneader to release the closure of the pressure relief port 2. Generally speaking, the first pressure cap 3 and the second pressure cap 4 can rotate at an angle greater than 90° to ensure a large pressure relief area when opened. After pressure relief, the first pressure cap 3 and the second pressure cap 4 are in an open state. After ensuring safety, the worker can move the first pressure cap 3 and the second pressure cap 4 to reset them. Alternatively, a limit block can be designed so that the first pressure cap 3 and the second pressure cap 4 can rotate at an angle less than 90°. With this design, after pressure relief, the first pressure cap 3 and the second pressure cap 4 can reset themselves by their own weight.

[0027] like Figures 1 to 3 As shown, the pressure relief port 2 can be an opening directly formed on the cover 1, penetrating both the upper and lower surfaces of the cover 1. Alternatively, a portion of the cover 1 can protrude upwards and have a pressure relief port 2. The outlet of the pressure relief port 2 is higher than the upper surface of the cover 1, generally 1–15 cm, for example, 1 cm, 5 cm, 10 cm, 12 cm, or 15 cm. Of course, the size can be selected according to the actual working conditions. Preferably, the pressure relief port 2 protrudes from the upper surface of the cover 1, with a protrusion height of 1–10 cm. The protruding structure extends the pressure relief port 2 vertically, which not only directly ensures sufficient pressure relief flow area but, more importantly, forms a guiding "pressure boosting chamber." When the internal pressure increases, the airflow gathers in this chamber and acts vertically on the inner surfaces of the first pressure cap 3 and the second pressure cap 4, generating a more concentrated opening force, thereby significantly improving the pressure relief response speed and release efficiency. In addition, the anti-clogging capability is enhanced. The raised design increases the actual outlet height of the pressure relief port 2, which can effectively prevent the material tumbling or splashing liquid in the kneader from directly covering or blocking the sealing surface of the pressure relief port 2, ensuring the long-term reliability of the pressure relief device under harsh working conditions. This simple structure solves the problems of pressure relief area, sensitivity and anti-clogging at the same time.

[0028] The pressure relief port 2 is generally a square hole, and the first pressure cap 3 and the second pressure cap 4 are correspondingly set as square caps. This ensures a tight seal and also facilitates processing and forming. In addition, other shapes of pressure relief ports 2, such as round holes and elliptical holes, can also be used, and the shapes of the first pressure cap 3 and the second pressure cap 4 are set accordingly.

[0029] Regarding the opening size of the pressure relief port 2, preferably, the vertical projection area of ​​the pressure relief port 2 on the upper surface of the cover 1 accounts for 20% to 50% of the upper surface area of ​​the cover 1, for example, 20%, 25%, 30%, 40%, or 50%. This design ensures sufficient pressure relief area, enabling the rapid release of dangerous pressure and meeting the safety requirements of the kneader. Alternatively, a more rational selection can be made based on actual working conditions.

[0030] For the first pressure cap 3 and the second pressure cap 4, lightweight plastics such as polypropylene, polyethylene, polycarbonate, and polymethyl methacrylate are generally used, or lightweight metal materials such as aluminum and aluminum alloys are selected to avoid the first pressure cap 3 and the second pressure cap 4 being too heavy, which would affect the internal pressure relief of the kneader. The thickness of the first pressure cap 3 and the second pressure cap 4 is generally selected to be 1 to 5 mm, preferably 1 to 3 mm. The sides of the first pressure cap 3 and the second pressure cap 4 are generally provided with flanges, which are fastened to the edge of the pressure relief port 2 to increase the sealing performance and fastening positioning.

[0031] like Figures 1 to 3 As shown, one side of the pressure relief port 2 is rotatably connected to the side of the first pressure cover 3, and the other side of the pressure relief port 2 is rotatably connected to the side of the second pressure cover 4. Specifically, one side of the pressure relief port 2 is rotatably connected to the side of the first pressure cover 3, and the adjacent side of the pressure relief port 2 is rotatably connected to the side of the second pressure cover 4. In this design, the rotation axis of the first pressure cover 3 intersects the rotation axis of the second pressure cover 4. Preferably, one side of the pressure relief port 2 is rotatably connected to the side of the first pressure cover 3, and the opposite side of the pressure relief port 2 is rotatably connected to the side of the second pressure cover 4. The rotation axis of the first pressure cover 3 and the rotation axis of the second pressure cover 4 are parallel to each other, ensuring that the opening trajectory of the first pressure cover 3 and the second pressure cover 4 is coordinated and smooth. When there is internal overpressure, the first pressure cover 3 and the second pressure cover 4 can smoothly and oppositely rotate around the parallel axis to open, forming the largest pressure relief channel. This avoids motion interference, poor opening, or wear of the sealing surface that may be caused by non-parallel axes, further improving the reliability and effectiveness of this simple mechanism.

[0032] For the rotatable connection, it can be a hinge, or a connection via a pivot or hinge. Preferably, a first hinge 5 is fixedly installed on one side of the pressure relief port 2, and one side of the pressure relief port 2 is rotatably connected to the side of the first pressure cover 3 via the first hinge 5. A second hinge 6 is fixedly installed on the other side of the pressure relief port 2, and the other side of the pressure relief port 2 is rotatably connected to the side of the second pressure cover 4 via the second hinge 6. Using the first hinge 5 and the second hinge 6 to achieve the rotatable connection results in a simple structure that is easy to manufacture and install.

[0033] like Figures 1 to 3 As shown, the first pressure cap 3 and the second pressure cap 4 together cover the pressure relief port 2, and their partial areas overlap to form a self-locking structure, thus sealing the pressure relief port 2 under normal conditions. Generally, the first pressure cap 3 and the second pressure cap 4 each seal 54% to 70% of the open area of ​​the pressure relief port 2, preferably 55% to 65%. Regarding the overlapping area, the overlapping area of ​​the first pressure cap 3 and the second pressure cap 4 accounts for 20% to 50% of the area of ​​the first pressure cap 3, preferably 30% to 40%, for example, 30%, 35%, 40%, or 45%. This design simultaneously addresses both "sealing" and "sensitivity." Under this ratio, the first pressure cap 3 and the second pressure cap 4 can achieve a reliable seal under normal conditions through their own weight and overlapping friction, preventing leakage; while when the pressure exceeds the limit, they can be promptly opened, ensuring the sensitivity of the pressure relief response and giving the simple structure excellent performance.

Claims

1. A pressure relief device for a kneader, comprising a cover (1), a pressure relief port (2) provided on the cover (1), and a pressure relief mechanism installed on the pressure relief port (2), characterized in that: The pressure relief mechanism includes a first pressure cover (3) and a second pressure cover (4). One side of the pressure relief port (2) is rotatably connected to the side of the first pressure cover (3), and the other side of the pressure relief port (2) is rotatably connected to the side of the second pressure cover (4). The first pressure cover (3) and the second pressure cover (4) together cover the pressure relief port (2), and some areas of the two overlap each other to close the pressure relief port (2) under normal conditions. When the pressure is released, the first pressure cover (3) and the second pressure cover (4) rotate around their own rotation axis under the pressure inside the kneader to release the closure of the pressure relief port (2).

2. The kneader pressure relief device as described in claim 1, characterized in that: One side of the pressure relief port (2) is rotatably connected to the side of the first pressure cover (3), and the other side of the pressure relief port (2) is rotatably connected to the side of the second pressure cover (4). The rotation axis of the first pressure cover (3) and the rotation axis of the second pressure cover (4) are parallel to each other.

3. The kneader pressure relief device as described in claim 1, characterized in that: The first pressure cap (3) and the second pressure cap (4) both close 55% to 65% of the open area of ​​the pressure relief port (2), and the overlapping area of ​​the first pressure cap (3) and the second pressure cap (4) accounts for 30% to 40% of the area of ​​the first pressure cap (3).

4. The kneader pressure relief device as described in claim 1, characterized in that: A first hinge (5) is fixedly installed on one side of the pressure relief port (2). One side of the pressure relief port (2) is rotatably connected to the side of the first pressure cover (3) through the first hinge (5). A second hinge (6) is fixedly installed on the other side of the pressure relief port (2). The other side of the pressure relief port (2) is rotatably connected to the side of the second pressure cover (4) through the second hinge (6).

5. The kneader pressure relief device as described in claim 1, characterized in that: The pressure relief port (2) protrudes from the upper surface of the cover (1), and its protrusion height is 1 to 10 cm.

6. The kneader pressure relief device as described in claim 1, characterized in that: The pressure relief port (2) is a square or round hole.

7. The kneader pressure relief device as described in claim 1, characterized in that: The thickness of the first pressure cap (3) and the second pressure cap (4) is 1-3 mm.

8. The kneader pressure relief device as described in claim 1, characterized in that: The vertical projection area of ​​the pressure relief port (2) on the upper surface of the cover (1) accounts for 20% to 50% of the upper surface area of ​​the cover (1).

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