A screen changer fluid tight wheel for easy installation

Abstract

The utility model discloses a kind of screen changer fluid sealing wheel convenient to install, it is related to screen changer technical field, including sealing wheel body, the sealing wheel body is annular column structure, its axial two end surfaces are installation datum plane and sealing working surface respectively, further including installation positioning structure and fluid sealing structure, the installation positioning structure is integrated in the installation datum plane of sealing wheel body, including the positioning boss distributed along the body circumference direction, the positioning boss is formed with the positioning hole of screen changer sealing cavity Cooperation.The utility model is accurately matched with positioning boss and sealing cavity, without manual repeated adjustment concentricity, collocation adaptive installation structure, dismounting operation is more convenient, main and deputy sealing lip form double sealing protection, elastic compensation ring can fill up sealing surface wear gap, main sealing lip coating can also enhance wear resistance, prolong overall service period, sealing wheel body inner wall stiffener can improve structure rigidity, resist deformation under high temperature and high pressure.

Description

Technical Field

[0001] This utility model relates to a fluid sealing wheel, specifically to a fluid sealing wheel for screen changers that is easy to install, and particularly to a fluid sealing wheel for screen changers used in plastic extrusion, chemical fluid transportation, and other scenarios. It is a fluid sealing component for screen changers with a quick positioning and installation structure and an adaptive sealing function. Background Technology

[0002] Screen changers are key devices in fluid transport systems used to filter impurities and ensure fluid purity. The fluid sealing wheel is the core sealing component within the screen changer, ensuring uninterrupted fluid transport during screen changing. It forms a fluid sealing pair with the screen changer's sealing cavity and filter frame, simultaneously switching and sealing the fluid channel during screen changing operations to prevent fluid leakage. Currently, screen changer fluid sealing wheels are widely used in fluid pipelines of equipment such as plastic extruders, rubber vulcanizing machines, and chemical reactors. Especially in high-temperature, high-pressure fluid transport scenarios (such as molten plastic transport), the installation accuracy and sealing reliability requirements for the sealing wheel are extremely high.

[0003] The existing technology has the following problems:

[0004] 1. The installation positioning accuracy depends on manual operation. Most existing sealing wheels are positioned by a single bolt hole. During installation, the coaxiality of the sealing wheel and the sealing cavity needs to be adjusted repeatedly. If the positioning deviation exceeds 0.1mm, it is easy to cause uneven contact of the sealing surface and cause fluid leakage.

[0005] 2. The sealing structure has weak wear resistance. The sealing surface of the existing sealing wheel is mostly made of a single rubber material. After long-term friction with the filter screen frame, scratches are easily formed, leading to a decline in sealing performance. Utility Model Content

[0006] This invention provides an easy-to-install fluid sealing wheel for screen changers to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] A fluid sealing wheel for a screen changer that is easy to install includes a sealing wheel body, which is an annular columnar structure with its two axial end faces being an installation reference surface and a sealing working surface, respectively. It also includes an installation positioning structure and a fluid sealing structure.

[0009] The installation positioning structure is integrated into the installation reference surface of the sealing wheel body, including positioning bosses distributed along the circumference of the body, and the positioning bosses cooperate with the positioning holes of the screen changer sealing cavity.

[0010] The fluid sealing structure is disposed on the sealing working surface of the sealing wheel body, and includes at least one sealing lip and an elastic compensation component.

[0011] Preferably, the outer circular surface of the positioning boss is provided with a polished positioning reference surface, the surface roughness of the reference surface is ≤0.8μm, and the fitting clearance between the positioning boss and the positioning hole of the screen changer sealing cavity is 0.01-0.05mm.

[0012] Preferably, the mounting and positioning structure further includes threaded holes, which are evenly distributed along the circumference of the sealing wheel body. The threaded holes are provided with anti-loosening threads, and the axis of the threaded holes is parallel to the axis of the sealing wheel body.

[0013] Preferably, the sealing lip of the fluid sealing structure includes a main sealing lip and a secondary sealing lip, the main sealing lip and the secondary sealing lip being radially distributed along the sealing wheel body, the cross-sectional shape of the main sealing lip being V-shaped or U-shaped, and the cross-sectional shape of the secondary sealing lip being U-shaped or arc-shaped.

[0014] Preferably, the elastic compensation component of the fluid sealing structure is an elastic compensation ring, which is sandwiched between the main sealing lip and the secondary sealing lip. The elastic compensation ring is made of one of hydrogenated nitrile rubber, fluororubber, or silicone rubber.

[0015] Preferably, the inner wall of the sealing wheel body is provided with reinforcing ribs, and the reinforcing ribs extend axially. The reinforcing ribs and the sealing wheel body are integrally formed. The number of reinforcing ribs is set to three to six and they are evenly distributed along the circumference of the sealing wheel body.

[0016] Preferably, the installation positioning structure can be replaced by quick-release slots distributed along the circumference of the body, and the quick-release slots and the elastic buckles of the screen changer sealing cavity form a detachable fit.

[0017] Preferably, the surface of the main sealing lip is provided with a sealing coating, the material of which is polytetrafluoroethylene or ceramic coating, and the coating thickness is 0.05-0.2mm.

[0018] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0019] 1. This utility model achieves a precise fit of 0.01-0.05mm between the circumferentially distributed positioning bosses on the mounting reference surface and the positioning holes of the screen changer sealing cavity, directly realizing the coaxiality calibration of the sealing wheel and the fluid channel, and stably controlling the coaxiality deviation within 0.05mm, completely eliminating the tedious operation of manual alignment based on experience; combined with the anti-loosening threaded holes (or optional quick-release slots) evenly distributed along the circumference, the threaded connection method can avoid displacement after installation, and the quick-release slots can achieve quick insertion and rotation fixation by engaging with the elastic buckle, shortening the disassembly and assembly time compared to the traditional single bolt positioning, and is particularly suitable for equipment such as plastic extruders that require frequent screen replacement and maintenance, reducing unplanned downtime.

[0020] 2. This utility model adopts a radial double sealing structure with main and auxiliary sealing lips. The main sealing lip tightly fits the filter screen frame under fluid pressure to form a primary seal, while the auxiliary sealing lip blocks trace amounts of penetrating fluid to form a secondary protection. This double protection avoids the risk of single-seal failure. The elastic compensation ring sandwiched between the two can automatically fill the gap through its own elastic deformation when there is a trace of wear of 0.05-0.2mm on the sealing surface, maintaining the sealing performance. At the same time, the 0.05-0.2mm thick polytetrafluoroethylene or ceramic coating on the surface of the main sealing lip can improve the wear resistance of the sealing surface and extend the overall service life of the sealing wheel.

[0021] 3. This utility model achieves precise matching between the positioning boss and the sealing cavity, eliminating the need for repeated manual adjustments to the coaxiality. With a suitable installation structure, disassembly and assembly are more convenient. The main and secondary sealing lips form a double sealing protection, the elastic compensation ring can fill the wear gap of the sealing surface, the coating of the main sealing lip can enhance wear resistance and extend the overall service life, and the reinforcing ribs on the inner wall of the sealing wheel can improve structural rigidity and resist deformation under high temperature and high pressure. Attached Figure Description

[0022] Figure 1 This is a front view of the sealing wheel of this utility model;

[0023] Figure 2 This is an axial sectional view of the sealing wheel of this utility model;

[0024] Figure 3 This is a schematic diagram of the sealed cavity of the screen changer in this utility model;

[0025] The image includes the following symbols:

[0026] 1. Sealing wheel body; 11. Reinforcing rib; 12. Weight reduction hole;

[0027] 2. Installation positioning structure; 21. Positioning boss; 22. Threaded hole; 23. Anti-loosening washer; 24. Quick release slot;

[0028] 3. Fluid sealing structure; 31. Main sealing lip; 32. Secondary sealing lip; 33. Elastic compensation ring; 34. Sealing coating;

[0029] 4. Sealed cavity of the screen changer;

[0030] 5. Filter rack;

[0031] 6. Tighten the bolts. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the implementation scheme and embodiments:

[0033] like Figure 1-3 As shown, this utility model provides an embodiment: a fluid sealing wheel for a screen changer that is easy to install, including a sealing wheel body 1, which is an annular columnar structure with its two axial end faces being the mounting reference surface and the sealing working surface, respectively. The inner wall of the sealing wheel body 1 is provided with reinforcing ribs 11, which extend axially. The reinforcing ribs 11 and the sealing wheel body 1 are integrally formed. The number of reinforcing ribs 11 is set to three to six and they are evenly distributed along the circumference of the sealing wheel body 1. It also includes an installation positioning structure 2 and a fluid sealing structure 3.

[0034] The mounting positioning structure 2 is integrated into the mounting reference surface of the sealing wheel body 1. It includes positioning bosses 21 distributed circumferentially along the body. The outer circular surface of the positioning bosses 21 is provided with a polished positioning reference surface with a surface roughness ≤0.8μm. The positioning bosses 21 and the positioning holes of the screen changer sealing cavity 4 are fitted together. The fit clearance between the positioning bosses 21 and the positioning holes of the screen changer sealing cavity 4 is 0.01-0.05mm. In addition, the mounting positioning structure 2 also includes threaded holes 22, which are evenly distributed circumferentially along the sealing wheel body 1. The threaded holes 22 are provided with anti-loosening threads, and the axis of the threaded holes 22 is parallel to the axis of the sealing wheel body 1. The mounting positioning structure 2 can be replaced by quick-release slots 24 distributed circumferentially along the body. The quick-release slots 24 and the elastic buckles of the screen changer sealing cavity 4 form a detachable fit.

[0035] The fluid sealing structure 3 is disposed on the sealing working surface of the sealing wheel body 1, including at least one sealing lip and an elastic compensation component. The sealing lip of the fluid sealing structure 3 includes a main sealing lip 31 and a secondary sealing lip 32. The main sealing lip 31 and the secondary sealing lip 32 are radially distributed along the sealing wheel body 1. The cross-sectional shape of the main sealing lip 31 is V-shaped or U-shaped, and the cross-sectional shape of the secondary sealing lip 32 is U-shaped or arc-shaped. The elastic compensation component of the fluid sealing structure 3 is an elastic compensation ring 33, which is sandwiched between the main sealing lip 31 and the secondary sealing lip 32. The material of the elastic compensation ring 33 is one of hydrogenated nitrile rubber, fluororubber, or silicone rubber. The surface of the main sealing lip 31 is provided with a sealing coating 34. The material of the sealing coating 34 is polytetrafluoroethylene or ceramic coating, and the coating thickness is 0.05-0.2 mm.

[0036] The working principle of this easy-to-install screen changer fluid sealing wheel will be explained in detail below.

[0037] like Figure 1-3 As shown, during operation, the positioning boss 21 of the installation positioning structure 2 forms a rigid positioning with the screen changer sealing cavity 4, ensuring that the sealing wheel is coaxial with the fluid channel. The sealing wheel is quickly fixed by fastening bolts or quick-release slots to avoid displacement after installation. When the fluid enters the screen changer, the pressure acts on the main sealing lip 31, making it tightly fit the filter screen frame 5 to form a primary seal. The secondary sealing lip 32 blocks the trace amount of fluid that may penetrate the main sealing lip, forming a secondary seal.

[0038] In addition, when the sealing surface experiences slight wear due to friction, the elastic compensation ring 33 deforms under the action of fluid pressure and its own elasticity, filling the wear gap and maintaining the sealing performance. The body reinforcing rib 11 enhances the structural rigidity of the sealing wheel under high temperature and high pressure, avoiding sealing failure caused by body deformation, and ultimately achieving the dual functions of quick installation and long-term reliable sealing.

[0039] Based on the above implementation scheme, the present invention also provides the following embodiments for further explanation:

[0040] Example 1

[0041] like Figure 1-3 As shown, this utility model provides a threaded positioning fluid sealing wheel for a screen changer that is easy to install.

[0042] In this embodiment, the sealing wheel body 1 is made of 316L stainless steel with an outer diameter of 80mm, an inner diameter of 50mm, and an axial thickness of 15mm. The mounting and positioning structure 2 includes four circumferentially evenly distributed positioning bosses 21 and four threaded holes 22. The positioning bosses 21 have a height of 3mm and an outer diameter of 65mm. Their outer circular surface is provided with a polished positioning reference surface of 0.8μm. The threaded holes 22 are of M8 specification and have a hole depth of 10mm. Anti-loosening thread mating 23 anti-loosening washers are provided in the holes. In the fluid sealing structure 3, the main sealing lip 31 and the secondary sealing lip 32 are both made of fluororubber. The main sealing lip 31 has a V-shaped opening facing the fluid side, and the secondary sealing lip 32 has a U-shaped cross section. The elastic compensation ring 33 is made of hydrogenated nitrile butadiene rubber (HNBR) with a thickness of 2mm. The inner wall of the body is provided with four evenly distributed reinforcing ribs 11 with a rib height of 5mm and a width of 4mm. The side wall of the body is also provided with four weight reduction holes 12 with a diameter of 8mm.

[0043] During installation, first insert the positioning boss 21 of the sealing wheel body 1 into the positioning hole of the screen changer sealing cavity 4. The coaxiality positioning deviation is ≤0.05mm through the reference surface of the positioning boss 21. Then, pass the fastening bolt 6 through the screen changer cavity hole and connect it with the threaded hole 22. After tightening, compress the anti-loosening washer 23 to achieve anti-loosening.

[0044] During operation, fluid pressure pushes the main sealing lip 31 to fit against the filter screen frame 5, the secondary sealing lip 32 forms a secondary seal, and the elastic compensation ring 33 deforms with pressure changes to compensate for the wear of the sealing surface.

[0045] Example 2

[0046] like Figure 1-3 As shown, based on Embodiment 1, this utility model provides a quick-release slot-type fluid sealing wheel for easy installation of a screen changer.

[0047] The difference between this embodiment and embodiment 1 lies in the design of the installation positioning structure 2. The threaded hole 22 is eliminated, and three evenly distributed quick-release slots 24 are set around the installation reference surface of the sealing wheel body 1. The slots are 5mm deep and 10mm wide, and the corresponding position of the screen changer sealing cavity 4 is provided with an elastic buckle.

[0048] During installation, insert the positioning boss 21 of the sealing wheel body 1 into the positioning hole, rotate it clockwise by 30°, and the quick-release slot 24 engages with the elastic buckle to complete the installation.

[0049] During disassembly, press the elastic buckle and rotate counterclockwise 30° to remove the sealing wheel. In the fluid sealing structure 3, the surface of the main sealing lip 31 is coated with a polytetrafluoroethylene sealing coating 34 (thickness 0.1mm) to improve high temperature resistance (applicable temperature ≤320℃).

[0050] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A fluid sealing wheel for a screen changer that is easy to install, comprising a sealing wheel body (1), wherein the sealing wheel body (1) is an annular columnar structure, and its two axial end faces are respectively an installation reference surface and a sealing working surface, characterized in that: It also includes an installation positioning structure (2) and a fluid sealing structure (3); The mounting and positioning structure (2) is integrated into the mounting reference surface of the sealing wheel body (1), including a positioning boss (21) distributed along the circumference of the body, and the positioning boss (21) is engaged with the positioning hole of the screen changer sealing cavity (4). The fluid sealing structure (3) is disposed on the sealing working surface of the sealing wheel body (1) and includes at least one sealing lip and an elastic compensation component.

2. The fluid sealing wheel for a screen changer that is easy to install according to claim 1, characterized in that: The outer circular surface of the positioning boss (21) is provided with a polished positioning reference surface, the surface roughness of the reference surface is ≤0.8μm, and the fitting clearance between the positioning boss (21) and the positioning hole of the screen changer sealing cavity (4) is 0.01-0.05mm.

3. The fluid sealing wheel for a screen changer that is easy to install according to claim 1, characterized in that: The mounting and positioning structure (2) also includes threaded holes (22), which are evenly distributed around the sealing wheel body (1). The threaded holes (22) are provided with anti-loosening threads, and the axis of the threaded holes (22) is parallel to the axis of the sealing wheel body (1).

4. The fluid sealing wheel for a screen changer that is easy to install according to claim 1, characterized in that: The sealing lip of the fluid sealing structure (3) includes a main sealing lip (31) and a secondary sealing lip (32). The main sealing lip (31) and the secondary sealing lip (32) are radially distributed along the sealing wheel body (1). The cross-sectional shape of the main sealing lip (31) is V-shaped or U-shaped, and the cross-sectional shape of the secondary sealing lip (32) is U-shaped or arc-shaped.

5. The fluid sealing wheel for a screen changer that is easy to install according to claim 1, characterized in that: The elastic compensation component of the fluid sealing structure (3) is an elastic compensation ring (33), which is sandwiched between the main sealing lip (31) and the secondary sealing lip (32). The material of the elastic compensation ring (33) is one of hydrogenated nitrile rubber, fluororubber or silicone rubber.

6. The fluid sealing wheel for a screen changer that is easy to install according to claim 1, characterized in that: The inner wall of the sealing wheel body (1) is provided with reinforcing ribs (11), and the reinforcing ribs (11) extend along the axial direction. The reinforcing ribs (11) and the sealing wheel body (1) are integrally formed. The number of reinforcing ribs (11) is set to three to six and they are evenly distributed along the circumference of the sealing wheel body (1).

7. The fluid sealing wheel for a screen changer that is easy to install according to claim 1, characterized in that: The installation positioning structure (2) can be replaced by a quick-release slot (24) distributed along the circumference of the body, and the quick-release slot (24) and the elastic buckle of the screen changer sealing cavity (4) form a detachable fit.

8. The fluid sealing wheel for a screen changer that is easy to install according to claim 4, characterized in that: The surface of the main sealing lip (31) is provided with a sealing coating (34), the material of which is polytetrafluoroethylene or ceramic coating, and the coating thickness is 0.05-0.2mm.

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