A novel sealing structure for the filter unit of a PTA device pressure filter.

Abstract

This utility model discloses a novel sealing structure for a filter unit of a PTA pressure filter, including a filter tank and a filter unit installed inside it. The filter unit includes a filter base, a sealing ring, fixing bolts, a non-asbestos gasket, and a ring gasket. The filter base is installed inside the filter tank, and has a through-hole at its center for allowing filtered liquid to flow out. The sealing ring is embedded in the through-hole of the filter base. The filter tank has a liquid outlet at its center that communicates with the through-hole. A non-asbestos gasket is pressed between the bottom surface of the filter base and the bottom upper surface of the filter tank. The filter base, filter tank, and non-asbestos gasket are fastened together by several fixing bolts. The non-asbestos gasket has a liquid passage hole at its center that corresponds to the through-hole and the liquid outlet, and the wall of the liquid passage hole is covered with a ring gasket. This utility model improves the structure of the sealing gasket to prevent liquid from eroding it.

Description

Technical Field

[0001] This utility model belongs to the field of chemical machinery sealing technology, specifically relating to a novel sealing structure for the filter unit of a pressure filter in a PTA device. Background Technology

[0002] PTA (purified terephthalic acid) is an important raw material in the polyester industry, and its production equipment includes oxidation and refining units. In the refining unit, solid-liquid separation is a crucial step, directly affecting the quality and yield of PTA. Traditional solid-liquid separation equipment, such as pressure centrifuges, suffers from high energy consumption, high maintenance costs, and difficulty in controlling product quality. Therefore, with technological advancements and changing industrial demands, improvements to solid-liquid separation equipment and its components have become an inevitable trend.

[0003] To address the problems of traditional solid-liquid separation equipment, pressure filters have been gradually introduced into PTA plants. With its simple structure, low operating costs, and low energy consumption, the pressure filter represents a significant innovation in separation technology. However, in practical applications, we have also found that some components of the pressure filter, especially the gaskets, often fail due to improper material selection, structural design defects, or manufacturing process issues, thus adversely affecting the overall stability and service life of the equipment.

[0004] The original sealing structure of the filter unit of the PTA pressurized rotary pressure filter is as follows: a sealing gasket is installed at the bottom of the filter unit. During operation, the material passes through the rotary drum filter tank and is filtered by the filter screen. Solids remain on the filter screen, while liquid flows out through the filter screen and the sealing gasket. However, the sealing gasket is prone to erosion and leakage after repeated feeding, liquid discharge, air intake, and air exhaust. Furthermore, its short service life necessitates periodic replacement, which can lead to equipment downtime, reduced unit capacity, and increased maintenance frequency.

[0005] Chinese patent application CN108194730A discloses an insulating sealing gasket with a ring-shaped metal skeleton. The two axial end faces of the metal skeleton are parallel planes, and a first transition layer, a first insulating layer, and a sealing layer are sequentially arranged outward from the two axial end faces of the metal skeleton. This gasket can meet the working conditions of temperature not exceeding 650℃, working pressure not exceeding 50MPa, and insulation resistance not exceeding 150MΩ. However, it does not provide a solution for the problem of direct erosion of the gasket by high-speed material flow, resulting in the gasket being easily damaged by erosion under high pressure and high flow rate conditions. Utility Model Content

[0006] To overcome the problem of easy erosion and damage to non-asbestos gaskets in rotary pressure filters of PTA units, which leads to decreased product quality and economic losses, this utility model proposes a new sealing structure for the filter unit of a PTA unit pressure filter. The structure of the original sealing gasket is improved, which can isolate the sealing gasket from liquid erosion, thereby significantly extending the service life of the equipment and reducing operating costs.

[0007] The technical solution adopted by this utility model to solve its technical problem is:

[0008] A novel sealing structure for a filter unit in a PTA pressure filter includes a filter tank and a filter unit installed inside it. The filter unit includes a filter base, a sealing ring, fixing bolts, a non-asbestos gasket, and a ring gasket. The filter base is installed inside the filter tank, and has a through-hole at its center for the filtered liquid to flow out. The sealing ring is embedded in the through-hole of the filter base. The filter tank has a liquid outlet at its center that communicates with the through-hole. A non-asbestos gasket is pressed between the bottom surface of the filter base and the bottom upper surface of the filter tank. The filter base, filter tank, and non-asbestos gasket are fastened together by several fixing bolts. The non-asbestos gasket has a liquid passage hole at its center that corresponds to the through-hole and the liquid outlet. The wall of the liquid passage hole is covered with a ring gasket to prevent the filtered liquid from eroding the non-asbestos gasket.

[0009] Furthermore, the bolt hole wall of the non-asbestos gasket, through which the fixing bolt passes, is also covered with a ring gasket.

[0010] Furthermore, the filter base is provided with bolt holes for installing fixing bolts.

[0011] Furthermore, the upper surface of the filter base has a converging slope structure that continuously decreases from the edge to the center.

[0012] Furthermore, the tilt angle of the upper surface of the filter base is 5-15°.

[0013] Furthermore, the ring gasket at the liquid passage hole and the bolt passage hole are bonded to the upper and lower surfaces of the non-asbestos gasket to form a three-layer structure.

[0014] Furthermore, the sealing ring is made of fluororubber and has a cross-sectional diameter of 2-3 mm.

[0015] Furthermore, the ring gasket is made of polytetrafluoroethylene.

[0016] The beneficial effects of this utility model are as follows:

[0017] (1) Extend the service life of the equipment: This application isolates the non-asbestos gasket from the filtered liquid by adding the erosion-resistant ring gasket. The equipment extends the service life of the non-asbestos gasket from 6 months to 12 months through the ring gasket covering design, reduces the frequency of equipment maintenance, and reduces the risk of equipment corrosion caused by gasket failure, thus extending the overall service life of the device.

[0018] (2) Improve material filtration efficiency: This application utilizes a converging slope to guide the filter liquid to flow directionally along the slope towards the central inner hole, reducing the amount of liquid retained on the surface of the filter base and improving filtration efficiency.

[0019] (3) Improve the scouring resistance of the equipment: This application forms a composite protective layer by bonding the ring gasket at the liquid passage hole and the bolt passage hole with the upper and lower surfaces of the non-asbestos gasket. By utilizing the high strength and compressive strength of the ring gasket and the elastic sealing characteristics of the non-asbestos gasket, the scouring stress is upgraded from the planar bearing of the traditional single-layer gasket to the three-layer filter gasket structure, which significantly improves the scouring resistance.

[0020] In summary, this application utilizes the corrosion resistance of PTFE ring gaskets, combined with the top-and-bottom structure of the ring gaskets and non-asbestos gaskets, to extend the service life of the non-asbestos gaskets to 12 months. The converging slope design of the filter base directs the flow of liquid, improving filtration efficiency. At the same time, the three-layer filter gaskets, along with the ring gasket protection at the bolt holes, significantly enhance the equipment's erosion resistance, achieving overall low-maintenance, high-efficiency, and long-cycle sealing performance, adapting to the operating conditions of PTA plants. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a side view of the ring pad structure of this utility model;

[0023] Figure 3 This is a plan view of the ring pad structure of this utility model.

[0024] In the diagram: 1. Filter tank, 2. Filter base, 3. Sealing ring, 4. Fixing bolt, 5. Non-asbestos gasket, 6. Liquid outlet, 7. Ring gasket. Detailed Implementation

[0025] To more clearly illustrate the purpose, technical solutions, and advantages of this disclosure, the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the following description of the embodiments is intended to explain and illustrate the overall concept of this disclosure and should not be construed as limiting the disclosure. In the specification and drawings, the same or similar reference numerals refer to the same or similar parts or components. For clarity, the drawings are not necessarily drawn to scale, and some well-known parts and structures may be omitted from the drawings.

[0026] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this disclosure, it should be noted that, 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; 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.

[0028] 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.

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0030]

Example 1

[0031] like Figure 1 As shown, a novel PTA device pressure filter unit sealing structure includes a filter tank 1 and a filter unit installed inside it. The filter tank 1 is a container for holding the material to be filtered and is used to separate solids and liquids. A liquid outlet 6 is provided at the center of the filter tank. The filter unit includes a filter base 2, a sealing ring 3, a fixing bolt 4, a non-asbestos gasket 5, and a ring gasket 7.

[0032] The filter base 2 is installed inside the filter tank 1 and is provided with bolt holes for installing and fixing bolts 4. It has a through-hole in the center for the filtered liquid to flow out. The through-hole is connected to the liquid outlet 6. The upper surface of the filter base 2 is a converging slope structure that continuously decreases from the edge to the center. The inclination angle of the upper surface is 5-15°, which is used to guide the liquid flow and improve the filtration efficiency.

[0033] The sealing ring 3 is embedded in the inner hole of the filter base 2. It is made of fluororubber and has a cross-sectional diameter of 2-3mm. The fluororubber sealing ring 3 performs excellently under extreme conditions such as high temperature, chemical corrosion, and high pressure. A non-asbestos gasket 5 is pressed between the bottom surface of the filter base 2 and the bottom upper surface of the filter tank 1. The filter base 2, filter tank 1, and non-asbestos gasket 5 are fastened together by several fixing bolts 4. The non-asbestos gasket 5 has a liquid passage hole at its center, corresponding to the inner hole and the liquid outlet 6. The wall of the liquid passage hole is covered with a ring gasket 7 to prevent the filtered liquid from scouring the non-asbestos gasket 5. The wall of the bolt passage hole of the non-asbestos gasket 5 is also covered with a ring gasket 7. In the above-mentioned locations where the ring gasket 7 is provided, the ring gasket 7 and the upper and lower surfaces of the non-asbestos gasket 5 are adhered to form a three-layer structure.

[0034]

Example 2

[0035] The rest of this embodiment is the same as that of embodiment 1. Detailed descriptions are provided of some of the structure, installation process, and operation process of this utility model:

[0036] The filter tank 1 contains the material to be filtered and has a filter unit inside for separating solids and liquids;

[0037] The filter base 2 is fixed to the filter tank 1 and is used to filter materials. The filter base 2 is provided with bolt holes for installing the fixing bolts 4.

[0038] The sealing ring 3 is used to provide a preliminary seal between the filter base 2 and the filter tank 1 to prevent material leakage.

[0039] The ring pad 7 is the core improvement of this utility model, located at the lower part of the filter base 2. The ring pad 7 is 0.5mm thick, and its inner hole is provided with a rounded R-angle, which facilitates the entry of materials, makes the flow channel smooth, increases the flow rate, and reduces the scouring of materials on the non-asbestos pad 5.

[0040] The fixing bolt 4 is used to fix the filter base 2, filter tank 1, and non-asbestos gasket 5 together to ensure the sealing effect.

[0041] The liquid in the filter tank 1 gathers from all sides towards the central area, passes through the ring pad 7, and is discharged through the liquid outlet 6.

[0042] Modification and installation process:

[0043] 1. Remove the original, failed filter base 2 from filter tank 1 and remove any remaining old sealing gaskets;

[0044] 2. Clean the contact surfaces to ensure there are no corrosive residues;

[0045] 3. Install the new non-asbestos gasket 5 covered with the ring gasket 7 between the bottom surface of the filter base 2 and the bottom upper surface of the filter tank 1;

[0046] 4. Use fixing bolts 4 to fix the filter base 2 and the non-asbestos gasket 5 covered with ring gasket 7 onto the filter tank 1.

[0047] Operation process:

[0048] The material to be filtered enters the filter tank 1, and the material is filtered through the filter unit. Solids remain above the filter base 2, and liquids are discharged from the liquid outlet 6 after passing through the filter unit.

[0049] The embodiments described above are merely preferred embodiments of this utility model, and not all feasible embodiments of this utility model. For those skilled in the art, any obvious modifications made without departing from the principles and spirit of this utility model should be considered to be included within the scope of protection of the claims of this utility model.

Claims

1. A novel sealing structure for the filter unit of a PTA pressure filter, characterized in that, The filter includes a filter tank (1) and a filter unit installed inside it; the filter unit includes a filter base (2), a sealing ring (3), a fixing bolt (4), a non-asbestos gasket (5), and a ring gasket (7); the filter base (2) is installed inside the filter tank (1), and the filter base (2) has a through-hole at its center for allowing the filtered liquid to flow out, and the sealing ring (3) is embedded in the through-hole of the filter base (2); the filter tank (1) has a liquid outlet at its center that communicates with the through-hole. (6); A non-asbestos gasket (5) is pressed between the bottom surface of the filter base (2) and the bottom upper surface of the filter tank (1). The filter base (2), the filter tank (1), and the non-asbestos gasket (5) are fastened together by several fixing bolts (4). The center of the non-asbestos gasket (5) is provided with a liquid passage hole corresponding to the inner hole and the liquid outlet (6). The wall of the liquid passage hole is covered with a ring gasket (7) to isolate the filter liquid from scouring the non-asbestos gasket (5).

2. The sealing structure of the filter unit of a novel PTA device pressure filter according to claim 1, characterized in that, The non-asbestos gasket (5) is also covered with a ring gasket (7) at the bolt hole through which the fixing bolt (4) passes.

3. The sealing structure of the filter unit of a novel PTA device pressure filter according to claim 1, characterized in that, The filter base (2) is provided with bolt holes for installing fixing bolts (4).

4. The sealing structure of the filter unit of a novel PTA device pressure filter according to claim 1, characterized in that, The upper surface of the filter base (2) is a converging slope structure that continuously decreases from the edge to the center.

5. The sealing structure of the filter unit of a novel PTA device pressure filter according to claim 4, characterized in that, The upper surface of the filter base (2) is tilted at an angle of 5-15°.

6. The sealing structure of the filter unit of a novel PTA device pressure filter according to claim 2, characterized in that, The ring gasket (7) at the liquid passage hole and the bolt passage hole are bonded to the upper and lower surfaces of the non-asbestos gasket (5) to form a three-layer structure.

7. A novel sealing structure for a pressure filter unit of a PTA device according to any one of claims 1-6, characterized in that, The sealing ring (3) is made of fluororubber and has a cross-sectional diameter of 2-3 mm.

8. A novel sealing structure for a pressure filter unit of a PTA device according to any one of claims 1-6, characterized in that, The ring gasket (7) is made of polytetrafluoroethylene.

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