Vacuum drum filter filtrate end seal structure

Abstract

The utility model relates to filter equipment sealing technical field especially relates to vacuum drum filter filtrate end sealing structure. The structure mainly includes integrated mounting seat, sealing assembly, bearing support cylinder, bearing assembly, swivel joint, swivel joint seal cover, filtrate output pipe, vacuum drum filtrate output shaft, and the integrated mounting seat is welded with the whole boring machine machining process through vacuum drum material groove, and the nitrogen monitoring design of swivel joint seal cover is combined, and the high -performance sealing system of " benchmark integration - processing precision - sealing monitoring - protection comprehensive " is constructed. The structure solves the traditional structure concentricity deviation, sealing leakage difficult to detect, equipment corrosion, swivel joint easy to damage leakage and other problems from three aspects of installation benchmark, processing precision, sealing monitoring, and sealing reliability, operation safety and maintenance convenience significantly improve, and the utility model relates to all kinds of vacuum drum filter, especially adapts to high sealing requirement and high environmental protection requirement scene.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology for filter equipment, and in particular to a sealing structure for the filtrate end of a vacuum drum filter. Background Technology

[0002] As a core piece of equipment in the field of solid-liquid separation, the sealing performance of the filtrate end of the vacuum drum filter directly determines the filtration efficiency, operating cycle, and operational safety of the equipment. Existing vacuum drum filter filtrate end sealing structures still suffer from several key technical defects in practical applications, seriously affecting the overall performance and reliability of the equipment. These defects include the following aspects: Insufficient concentricity accuracy is one of the most prominent problems. In traditional structures, the installation references of the sealing assembly and the bearing assembly are independent, and they are usually manufactured using separate machining and assembly processes. The lack of a unified positioning reference and overall machining strategy leads to significant concentricity deviations between the sealing ring and the bearing housing. Although some improved structures attempt to mitigate this problem by optimizing the connection method, the modular design of the mounting base and the lack of unified machining references make it difficult to achieve fundamental concentricity control at the structural level. This deviation causes uneven stress on the sealing surface during vacuum drum rotation, exacerbating localized wear and leading to seal failure and media leakage. Furthermore, the rotary joint, as a key component connecting the fixed pipeline and the rotating drum, is directly affected by external loads such as pipeline installation stress and thermal stress, causing it to bear additional bending moments or radial forces during actual operation, further reducing seal life and increasing the failure frequency.

[0003] Another major technical shortcoming is the difficulty in real-time detection and early warning of sealing leaks. Rotary joints play a crucial role in filtrate delivery, and their sealing condition directly affects the sealing performance of the entire vacuum system. However, existing structures generally lack effective online monitoring methods, making it impossible to perceive and provide feedback on the wear level of the sealing surface and the amount of leakage in real time. When a small leak initially occurs in the rotary joint, the leak path is hidden and not visually accessible, making it difficult for operators to detect the problem promptly through routine inspections. As operating time accumulates, small leaks gradually expand, not only causing media leakage and environmental pollution, but also potentially leading to equipment corrosion, lubrication failure, or even system shutdown due to liquid entering the bearing cavity or transmission parts, significantly increasing the number of unplanned maintenance operations and operating and maintenance costs.

[0004] Inadequate protection systems also limit the applicability and lifespan of existing sealing structures. Currently common sealing layouts are often directly exposed to the atmosphere. In the event of a leak, materials immediately enter the surrounding environment, causing not only the loss of production materials but also the potential for chemical reactions with moisture and oxygen in the air to generate corrosive substances. These substances further corrode bearings, bushings, rotary joint housings, and the equipment's main structure, causing dual damage: environmental pollution and accelerated equipment aging. The safety and environmental risks posed by this problem are particularly pronounced in situations involving corrosive, toxic, or high-purity materials.

[0005] Furthermore, poor consistency in assembly and machining further restricts the performance stability of the sealing structure. Existing seals and bearing support components are typically welded into multi-part structures or machined individually. Final alignment between components relies on on-site debugging and manual adjustment, resulting in complex, time-consuming assembly processes that demand a high level of operator skill. Due to the lack of integrated machining and modular design, the sealing performance of different equipment, and even the same equipment, varies significantly across different maintenance cycles, making it difficult to standardize maintenance and impacting equipment reliability.

[0006] To address the aforementioned issues, there is an urgent need to develop a vacuum drum filter filtrate end sealing structure based on a unified benchmark, with high machining precision, support for real-time monitoring of sealing status, and comprehensive protection capabilities. This would improve the overall performance and service life of the equipment, and meet the pressing needs of modern chemical, mining, and environmental protection industries for highly reliable solid-liquid separation equipment. Utility Model Content

[0007] The purpose of this utility model is to provide a better sealing structure for the filtrate end of a vacuum drum filter. The specific purpose is explained in the several substantial technical effects described in the specific implementation section.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A sealing structure for the filtrate end of a vacuum drum filter, characterized in that it includes an integrated mounting base 1, a sealing assembly 2, a bearing support cylinder 3, a bearing assembly 4, a rotary joint 5, a rotary joint sealing cover 6, a filtrate output pipe 7, and a vacuum drum filtrate output shaft 8. An integrated mounting base 1 is welded and fixed on the material trough of the vacuum drum filter. The sealing component 2 is fixedly assembled on the integrated mounting base. The bearing support cylinder 3 is fixedly assembled on the integrated mounting base 1. The sealing component 2 and the bearing support cylinder 3 are assembled through the tolerance fit of the integrated mounting base 1, which can ensure the concentricity of the sealing component 2 and the bearing support cylinder 3. The bearing assembly 4 is assembled on the right side of the bearing support cylinder 3 and is assembled with the bearing support cylinder 3 in tolerance fit, and is used to support the vacuum drum filtrate output shaft 8. The rotary joint 5 is coaxially connected to the vacuum drum filtrate output shaft 8; the rotary joint sealing cover 6 is located on the outside of the rotary joint 5, the left side of the rotary joint sealing cover 6 is bolted to the bearing assembly 4, and the right side of the rotary joint sealing cover 6 forms a closed protective cavity that is bolted to the filtrate output pipe 7.

[0009] A further technical solution of this utility model is that the rotary joint sealing cover 6 is provided with a nitrogen inlet 601 and a pressure gauge port 602. The nitrogen inlet 601 is used to introduce nitrogen into the closed protective cavity 603, and the pressure gauge port 602 is used to install a pressure gauge to monitor the pressure inside the cavity in order to determine the sealing condition of the rotary joint 5.

[0010] A further technical solution of this utility model is that the integrated mounting base 1 and the vacuum drum filter material tank are integrally welded together, and the inner holes of both the integrated mounting base and the drive end mounting base are machined by a single clamping integral boring machine. After machining, the parallelism deviation between the assembly reference surface of the integrated mounting base and the assembly reference surface of the bearing support cylinder 3 is ≤0.02mm, and the coaxiality deviation of the central axis is ≤0.01mm.

[0011] A further technical solution of this utility model is that the sealing component 2 is composed of a non-metallic sealing element 201, a sealing box 202, a sealing cover 203, a compression spring 204, and a bushing 205; the non-metallic sealing element 201 is made of wear-resistant flexible sealing material, the non-metallic sealing element 201 and the bushing 205 are fitted together to form a sealing surface, and the mating surface of the bushing 205 and the non-metallic sealing element 201 is provided with a tungsten carbide wear-resistant coating, and the bushing 205 is fitted onto the vacuum drum filtrate output shaft 8.

[0012] A further technical solution of this utility model is that a sealing cover 203 is bolted to the sealing box body on the left side of the non-metallic seal 201, and a compression spring 204 is fitted on the bolt. The compression spring 204 can provide extrusion force to compress the sealing cover 203 and thus compress the non-metallic seal 201. During the operation of the equipment, as the non-metallic seal 201 wears, the gap between the non-metallic seal 201 and the bushing 205 of the vacuum drum filtrate output shaft increases, and the compression spring 204 releases its elastic force, which can compress the non-metallic seal 201.

[0013] A further technical solution of this utility model is that the sealing component 2 and the integrated mounting base 1 are connected by an annular sealing groove 206, and a corrosion-resistant elastic sealing ring 207 is embedded in the groove; the bearing support cylinder 3 and the bearing support mounting part of the integrated mounting base 1 are fixedly connected by bolts, and a sealing gasket is provided on the connection surface.

[0014] A further technical solution of this utility model is that the bearing assembly consists of four parts, including a bearing housing 401, a rolling bearing 403, and a sealing end cap 402. The bearing housing 401 is fixed to the right side of the bearing support cylinder 3 and connected by a stop bolt. The rolling bearing 403 is assembled between the bearing housing 401 and the vacuum drum filtrate output shaft 8. The sealing end cap 402 is bolted to the right side of the bearing housing 401 and is provided with a sealing gasket, and forms a gap seal with the vacuum drum filtrate output shaft 8.

[0015] A further technical solution of this utility model is that the rotary joint sealing cover 6 is provided with a sealing gasket on the connection surface between the rotary joint sealing cover 6 and the bearing assembly; the left side of the rotary joint 5 is fixedly connected to the vacuum drum filtrate output shaft 8 by a stop fit and bolts, and the right side is connected to the filtrate output pipe 7 by a flange to ensure coaxiality and sealing performance, forming a closed cavity with the rotary joint sealing cover 6, and the filtrate output pipe 7 is connected to the filtrate collection system of the vacuum drum filter through a pipe.

[0016] A further technical solution of this utility model is that a flow regulating valve is provided at the nitrogen inlet 601 to control the nitrogen inlet rate; the pressure gauge port 602 is equipped with a pressure transmitter, which is electrically connected to the control system of the filter to realize real-time monitoring and alarm of the sealing status.

[0017] The present invention, employing the above technical solution, offers the following advantages over existing technologies: Precise concentricity control is achieved: Through the integrated mounting base design on the vacuum drum material trough, combined with the overall machining process of the sealing mounting position and the bearing support mounting position, the sealing assembly and the bearing support cylinder achieve a unified machining benchmark, with a coaxiality deviation of ≤0.01mm. This ensures that the concentricity of the bearing assembly and the sealing assembly reaches the industry's top level. Uniform stress on the sealing surface significantly reduces the wear rate, extends the service life of the sealing assembly by more than 50% compared to traditional structures, and greatly improves the operational stability of the equipment.

[0018] Real-time monitoring of sealing condition and proactive prevention of safety risks: The design of the nitrogen inlet and pressure gauge port of the rotary joint sealing cover establishes an active monitoring and protection system. By introducing nitrogen to create a slightly positive pressure environment, material leakage in the material trough of the vacuum drum is suppressed; real-time monitoring of the internal pressure using a pressure gauge or pressure transmitter allows for the immediate detection of even minor leaks in the rotary joint. Leaks not only pollute the environment but can also prevent long-term stable operation of the equipment, resulting in significant operating and maintenance costs.

[0019] The combination of multiple protections achieves a win-win situation for both environmental protection and economy: the sealed protective cavity of the rotary joint sealing cover isolates leaked materials, prevents materials from coming into contact with air and generating corrosive substances, and protects the bearing components, rotary joint and equipment body; nitrogen protection further reduces the risk of material oxidation and corrosion. Easy assembly and high consistency: The integrated mounting base simplifies the assembly process of the sealing components and the bearing support cylinder, eliminating the need for multiple positioning adjustments, ensuring the installation accuracy of the bearing housing components, and significantly improving assembly efficiency; the overall processing technology ensures structural consistency between different equipment, reducing maintenance costs and downtime.

[0020] Outstanding structural adaptability: Each component adopts a modular design, which can be adapted and adjusted according to the size requirements of different models of vacuum drum filters. It is suitable for multiple industries such as chemical, pharmaceutical, and metallurgical industries with high requirements for vacuum drum sealing, and has extremely high promotional value. Attached Figure Description

[0021] To further illustrate this utility model, the following description is provided in conjunction with the accompanying drawings: Figure 1 is a schematic diagram of the assembly of the filtrate end sealing structure of the vacuum drum filter of this utility model; the markings in the figure are: 1-integrated mounting base, 2-sealing component, 3-bearing support cylinder, 4-bearing component, 5-rotary joint, 6-rotary joint sealing cover, 7-filtrate output pipe, 8-vacuum drum filtrate output shaft, 601-nitrogen inlet, 602 pressure gauge port, 603-closed protective cavity.

[0022] Figure 2 This is a schematic diagram of the sealing assembly of the filtrate end sealing structure of the vacuum drum filter of this utility model; the markings in the figure are: 1 - integrated mounting base, 201 - non-metallic seal, 202 - sealing box body, 203 - sealing gland, 204 - compression spring, 205 - bushing, 206 - annular sealing groove, 207 - corrosion-resistant elastic sealing ring, 8 - vacuum drum filtrate output shaft.

[0023] Figure 3 This is a schematic diagram of the bearing assembly of the filtrate end sealing structure of the vacuum drum filter of this utility model; the markings in the figure are: 3-bearing support cylinder, 8-vacuum drum filtrate output shaft, 401-sealing assembly, 402-sealing end cover, 403-rolling bearing. Detailed Implementation

[0024] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention 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 the present invention. In addition, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" 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; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] This patent provides multiple parallel solutions; the different descriptions represent improved or parallel solutions based on a basic solution. Each solution has its own unique characteristics. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other. Fixing methods not described herein can be any type of fixing, such as threaded fixing, bolt fixing, or adhesive bonding.

[0027] As shown in Figure 1, a filtrate end sealing structure for a vacuum drum filter is provided. An integrated mounting base 1 is welded and fixed to the side wall of the vacuum drum material tank. The mounting base is formed together with the mounting base at the drive end and includes a sealing mounting position for installing the sealing component 2 and a bearing support mounting position for installing the bearing support cylinder 3.

[0028] The core design of the integrated mounting base 1 is that the inner hole of the sealing mounting position and the inner hole of the drive end mounting base are machined by a single clamping integral boring machine. During the machining process, the same reference is used for positioning to ensure that the central axis of the sealing mounting positions at both ends and the bearing support mounting positions are completely collinear. The parallelism deviation of the assembly reference surface is controlled within 0.02mm, and the coaxiality deviation is ≤0.01mm, providing an absolutely accurate reference guarantee for the concentric assembly of the sealing component 2 and the bearing component 4.

[0029] Sealing assembly and integrated mounting base: The sealing assembly 2 is bolted to the sealing mounting position of the integrated mounting base 1. The connection surface between the two has an annular sealing groove 206, into which a corrosion-resistant elastic sealing ring 207, such as a fluororubber sealing ring, is embedded, achieving a sealed connection between the sealing assembly 2 and the integrated mounting base 1. A non-metallic seal 201 is integrally integrated into the sealing housing 202. The non-metallic seal 201 is made of flexible sealing materials such as reinforced polytetrafluoroethylene or wear-resistant fluororubber. This effectively reduces labor maintenance costs. Meanwhile, the bushing surface that mates with the non-metallic seal 201 is coated with a tungsten carbide wear-resistant coating, significantly improving the wear resistance and service life of the sealing surface, forming the first reliable line of defense.

[0030] Bearing support cylinder and bearing assembly: The bearing support cylinder 3 is bolted to the bearing support mounting position of the integrated mounting base 1. The connection surface is equipped with an acid and alkali resistant sealing gasket to ensure the sealing of the connection. The bearing assembly 4 is assembled on the right side of the bearing support cylinder 3. The bearing seat 401 is fixed to the flange end of the bearing support cylinder 3 via a stop fit and bolts for precise positioning, used to support the vacuum drum filtrate output shaft 8. The bearing assembly 4 includes a bearing seat 401, a rolling bearing 403, and a sealing end cap 402. The bearing seat 401 is fixed to the positioning stop of the flange of the bearing support cylinder 3. The rolling bearing 403 is fitted between the bearing seat 401 and the vacuum drum filtrate output shaft 8, providing stable support for the vacuum drum filtrate output shaft 8 and ensuring smooth rotation of the vacuum drum. The sealing end cap 402 is bolted to the bearing seat 401 for sealing connection and forms a gap seal with the vacuum drum filtrate output shaft 8 to prevent leakage of internal lubricating grease and to prevent leaked material from entering the bearing. Since the installation positions of the bearing support cylinder 3 and the sealing component 2 are based on the overall machining reference of the integrated mounting base 1, the central axis heights of the two are coaxial, thus ensuring that the concentricity of the bearing component 4 and the sealing component 2 is precise and controllable.

[0031] Rotary joint and rotary joint sealing cover: The left side of the rotary joint 5 is fixedly connected to the vacuum drum filtrate output shaft 8 using a stop fit and bolts, and the right side is connected to the filtrate output pipe 7 via a flange, ensuring coaxiality and sealing. It is used to export the filtrate inside the drum to the external collection system. The rotary joint sealing cover 6 is a hollow cavity structure, covering the outside of the rotary joint 5. Its left side is connected to the bearing assembly, and the connection surface is sealed with a gasket to effectively prevent external air from entering or internal gas / liquid leakage. The right side is fixedly connected to the filtrate output pipe 7 via flange bolts, forming a sealed protective cavity 603 inside the rotary joint sealing cover 6. The key design of the rotary joint sealing cover 6 is that it is equipped with a nitrogen inlet 601 and a pressure gauge port 602. The nitrogen inlet 601 is connected to the nitrogen supply system through a pipeline, which can introduce dry nitrogen into the closed protective cavity 603 to form a slightly positive pressure protective environment. On the one hand, it isolates the outside air from contact with the leaked material, and on the other hand, it inhibits the leakage of material in the vacuum drum material tank. The pressure gauge port 602 is used to install a pressure gauge or pressure transmitter. By monitoring the pressure change in the closed protective cavity 603, the sealing status of the rotary joint 5 can be judged in real time. When the rotary joint 5 leaks, the pressure in the protective cavity 603 will abnormally decrease, causing the rotary joint to leak or increase the gas content of the material in the material tank.

[0032] An integrated mounting base 1 is welded and fixed to the side wall of the vacuum drum material trough for installing the sealing components and bearing support cylinder 3. The integrated mounting base 1 and the drive end mounting base are welded structures. The inner holes of both are machined as a whole in one clamping on a boring machine. After machining, the coaxiality deviation is ≤0.01mm and the parallelism deviation is ≤0.02mm.

[0033] The sealing component 2 is fixedly assembled to the integrated mounting base 1 by high-strength bolts, and the annular sealing groove 206 of the connecting surface is fitted with a fluororubber elastic sealing ring 207; the non-metallic sealing component 201 is made of reinforced polytetrafluoroethylene material, nested in the sealing cavity of the sealing box 202, and the bushing 205 with tungsten carbide wear-resistant coating on the mating surface is tightly fitted to form the first seal.

[0034] The bearing support cylinder 3 is fixedly assembled to the integrated mounting base 1 by bolts; the bearing assembly 4 includes a bearing housing 401, a rolling bearing 403 and a sealing end cover 402. The bearing assembly 4 is assembled on the right side of the bearing support cylinder 3. The bearing housing 401 is fixed to the flange end of the bearing support cylinder 3 by a stop fit and bolts to achieve precise positioning. The rolling bearing 403 is assembled between the bearing housing 401 and the vacuum drum filtrate output shaft 8 of the vacuum drum. The sealing end cover 402 is sealed to the bearing housing 401 by bolts to form a gap seal with the vacuum drum filtrate output shaft 8.

[0035] The left side of the rotary joint 5 is fixedly connected to the vacuum drum filtrate output shaft 8 using a stop fit and bolts, while the right side is connected to the filtrate output pipe 7 via a flange, ensuring coaxiality and sealing. The rotary joint sealing cover 6 covers the outside of the rotary joint 5, with its left side bolted to the bearing housing assembly 4 and its right side bolted to the filtrate output pipe 7, forming a closed protective cavity 603. The outlet of the filtrate output pipe 7 is connected to the filtrate collection system via a pipeline. The rotary joint sealing cover 6 is equipped with a nitrogen inlet 601 and a pressure gauge port 602. A flow regulating valve is installed at the nitrogen inlet 601, which is connected to the nitrogen supply system via a pipeline; a pressure gauge is installed at the pressure gauge port 602.

[0036] In this embodiment, the sealing structure first introduces dry nitrogen into the sealed protective cavity 603 through the nitrogen inlet 601 during operation. The flow regulating valve is adjusted to maintain a slightly positive pressure inside the sealed protective cavity 603. The pressure gauge displays the pressure inside the cavity in real time, and the pressure transmitter transmits the pressure data to the control system. If a slight leak occurs in the rotary joint 5, the pressure inside the sealed protective cavity 603 will change abnormally, and the control system will immediately issue an alarm signal, allowing the operator to stop the machine in time.

[0037] In summary, this utility model discloses a filtrate end sealing structure for a vacuum drum filter, relating to the field of filtration equipment sealing technology. The structure mainly includes an integrated mounting base, sealing components, a bearing support cylinder, a bearing assembly, a rotary joint, a rotary joint sealing cover, a filtrate output pipe, and a vacuum drum filtrate output shaft. Through the integrated mounting base welded to the vacuum drum material trough and the overall boring machine machining process, combined with the nitrogen monitoring design of the rotary joint sealing cover, a high-performance sealing system of "integrated reference, precise machining, sealing monitoring, and comprehensive protection" is constructed. This structure thoroughly solves the problems of concentricity deviation, difficult-to-detect seal leakage, equipment corrosion, and easy damage and leakage of the rotary joint in traditional structures from three aspects: installation reference, machining accuracy, and seal monitoring. It significantly improves sealing reliability, operational safety, and maintenance convenience, and is suitable for various vacuum drum filters, especially for scenarios with high sealing requirements and high environmental protection requirements.

[0038] It should be noted that the multiple solutions provided in this patent include their own basic solutions, which are independent of each other and do not restrict each other. However, they can also be combined with each other without conflict to achieve multiple effects.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims.

Claims

1. A sealing structure for the filtrate end of a vacuum drum filter, characterized in that, Includes an integrated mounting base (1), a sealing assembly (2), a bearing support cylinder (3), a bearing assembly (4), a rotary joint (5), a rotary joint sealing cover (6), a filtrate output pipe (7), and a vacuum drum filtrate output shaft (8); An integrated mounting base (1) is welded and fixed on the material trough of the vacuum drum filter. The sealing component (2) is fixedly assembled on the integrated mounting base. The bearing support cylinder (3) is fixedly assembled on the integrated mounting base (1). The sealing component (2) and the bearing support cylinder (3) are assembled through the tolerance fit of the integrated mounting base (1), which can ensure the concentricity of the sealing component (2) and the bearing support cylinder (3). The bearing assembly (4) is assembled on the right side of the bearing support cylinder (3) and is assembled with the bearing support cylinder (3) in tolerance fit to support the vacuum drum filtrate output shaft (8). The rotary joint (5) is coaxially connected with the vacuum drum filtrate output shaft (8); the rotary joint sealing cover (6) is located outside the rotary joint (5), the left side of the rotary joint sealing cover (6) is bolted to the bearing assembly (4), and the right side of the rotary joint sealing cover (6) forms a closed protective cavity that is bolted to the filtrate output pipe (7).

2. The filtrate end sealing structure of a vacuum drum filter as described in claim 1, characterized in that, The rotary joint sealing cover (6) is provided with a nitrogen inlet (601) and a pressure gauge port (602). The nitrogen inlet (601) is used to introduce nitrogen into the closed protective cavity (603), and the pressure gauge port (602) is used to install a pressure gauge to monitor the pressure inside the cavity in order to determine the sealing condition of the rotary joint (5).

3. The filtrate end sealing structure of the vacuum drum filter as described in claim 1, characterized in that, The integrated mounting base (1) is integrally welded to the material tank of the vacuum drum filter, and the inner holes of both the integrated mounting base and the drive end mounting base are machined by a single clamping integral boring machine. After machining, the parallelism deviation between the assembly reference surface of the integrated mounting base and the assembly reference surface of the bearing support cylinder (3) is ≤0.02mm, and the coaxiality deviation of the central axis is ≤0.01mm.

4. The filtrate end sealing structure of the vacuum drum filter as described in claim 1, characterized in that, The sealing assembly (2) consists of a non-metallic seal (201), a sealing box (202), a sealing cap (203), a compression spring (204), and a bushing (205). The non-metallic seal (201) is made of wear-resistant flexible sealing material. The non-metallic seal (201) and the bushing (205) are fitted together to form a sealing surface. The mating surface between the bushing (205) and the non-metallic seal (201) is provided with a tungsten carbide wear-resistant coating. The bushing (205) is fitted onto the vacuum drum filtrate output shaft (8).

5. The filtrate end sealing structure of the vacuum drum filter as described in claim 4, characterized in that, The non-metallic seal (201) has a sealing cap (203) on the left side that is bolted to the sealing box body. The bolt is fitted with a compression spring (204). The compression spring (204) can provide extrusion force to squeeze the sealing cap (203) and thus compress the non-metallic seal (201). During the operation of the equipment, as the non-metallic seal (201) wears, the gap between the non-metallic seal (201) and the bushing (205) of the vacuum drum filtrate output shaft increases. The compression spring (204) releases its elastic force and can compress the non-metallic seal (201).

6. The filtrate end sealing structure of the vacuum drum filter as described in claim 1, characterized in that, The sealing component (2) and the integrated mounting base (1) are connected by an annular sealing groove (206), and a corrosion-resistant elastic sealing ring (207) is embedded in the groove; the bearing support cylinder (3) and the bearing support mounting part of the integrated mounting base (1) are fixedly connected by bolts, and a sealing gasket is provided on the connection surface.

7. The filtrate end sealing structure of the vacuum drum filter as described in claim 1, characterized in that, The bearing assembly (4) includes a bearing housing (401), a rolling bearing (403), and a sealing end cap (402). The bearing housing (401) is fixed to the right side of the bearing support cylinder (3) and connected by a stop bolt. The rolling bearing (403) is assembled between the bearing housing (401) and the vacuum drum filtrate output shaft (8). The sealing end cap (402) is bolted to the right side of the bearing housing (401) and is provided with a sealing gasket, and forms a gap seal with the vacuum drum filtrate output shaft (8).

8. The filtrate end sealing structure of the vacuum drum filter as described in claim 1, characterized in that, The rotary joint sealing cover (6) is provided with a sealing gasket on the connection surface with the bearing assembly; the left side of the rotary joint (5) is connected to the vacuum drum filtrate output shaft (8) by a stop fit and bolt fixing, and the right side is connected to the filtrate output pipe (7) by a flange to ensure coaxiality and sealing, forming a closed cavity with the rotary joint sealing cover (6); the filtrate output pipe (7) is connected to the filtrate collection system of the vacuum drum filter through a pipe.

9. The filtrate end sealing structure of the vacuum drum filter as described in claim 1, characterized in that, A flow regulating valve is provided at the nitrogen inlet (601) to control the nitrogen inlet rate; a pressure transmitter is provided at the pressure gauge port (602), which is electrically connected to the control system of the filter to realize real-time monitoring and alarm of the sealing status.

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