Self-cleaning anti-blocking high-frequency wear-resistant ball valve

Abstract

The utility model discloses a self-cleaning anti-blocking high-frequency wear-resistant ball valve, belongs to the technical field of valves, and aims to solve the technical problems in the prior art that a pre-tightening spring of a valve seat fails, a sealing surface of the valve seat is pulled and damaged, and powder enters a bearing part of a valve rod to cause sealing failure. The ball valve comprises a valve body, a valve rod and a ball body, a plurality of self-cleaning valve seat assemblies are arranged in the valve body and connected with the ball body in a matched mode. The self-cleaning valve seat assembly comprises a valve seat and a spring seat, a spring cavity is formed in the spring seat, a spring is arranged in the spring cavity, one end of the spring is fixed to the spring cavity, and the other end of the spring abuts against the valve seat. And a self-cleaning sealing surface is formed between the valve seat and the ball body. The self-cleaning anti-blocking high-frequency wear-resistant ball valve has a sealing surface self-cleaning function, and is high in sealing grade and long in service life.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a self-cleaning and anti-clogging high-frequency wear-resistant ball valve. Background Technology

[0002] In recent years, the petrochemical industry has developed rapidly, and the production capacity of polyolefin plants such as polypropylene and polyethylene has been continuously increasing, with production plants operating for long periods. In order to reduce production costs and ensure the safe and stable operation of the plants, selecting practical and suitable valves is of great importance to ensuring the safe and long-term effective operation of the plants.

[0003] Ball valves in gas-phase polymerization polypropylene units and linear low-density polyethylene units suffer from a series of problems due to the high-frequency switching of these valves, including valve stem damage, failure of the internal O-ring seals, severe wear of the valve seat sealing components, and failure of the springs that provide pre-tightening seals to the valve seats. These problems lead to frequent shutdowns for maintenance, severely impacting production efficiency and the company's competitiveness.

[0004] Current hard-seal ball valves generally adopt an identical valve seat structure on both sides, meaning that the valve seats on both sides have the same structure. The valve is sealed by the preload force generated by the spring after the left body is pressed. The structure is as follows: Figure 1 As shown, the existing technology has the following technical problems:

[0005] Valve seat preload spring failure: This type of valve seat design is prone to causing powder to accumulate in the gap between the valve seat and the valve body, forming a dead zone for material flow, which then enters the valve seat spring cavity, leading to spring failure, valve seat jamming, and further affecting sealing performance.

[0006] Scratching and damage to the valve seat sealing surface: Due to the high-frequency and high-speed operation between the ball and seat sealing surfaces, the opening and closing one-way stroke time does not exceed 3 seconds, resulting in a small amount of hard alloy layer falling off and accumulating on the sealing surface. Metal adhesion occurs between the valve seat and the ball, which in turn causes severe scratching of the sealing surface and even damages the hardened layer of the ball and valve seat.

[0007] Powder entering the valve stem bearing: Under normal operating conditions, powder in the valve cavity or dust in the medium can enter the valve stem bearing through the gap between the valve body and the valve stem. Under high-speed operation, it can mix with the valve stem bearing, causing the valve stem to jam and the valve to be unable to open or close. Utility Model Content

[0008] The purpose of this invention is to provide a self-cleaning, anti-clogging high-frequency wear-resistant ball valve to solve the technical problems in the prior art, such as valve seat preload spring failure, valve seat sealing surface damage, and powder entering the valve stem bearing area, which leads to sealing failure.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] This utility model provides a self-cleaning and anti-clogging high-frequency wear-resistant ball valve, including a valve body, a valve stem, and a ball; the valve body is provided with a plurality of self-cleaning valve seat assemblies, and the plurality of self-cleaning valve seat assemblies are respectively connected to the ball;

[0011] The self-cleaning valve seat assembly includes a valve seat and a spring seat. A spring cavity is formed inside the spring seat, and a spring is disposed inside the spring cavity. One end of the spring is fixed to the spring cavity, and the other end abuts against the valve seat.

[0012] A self-cleaning sealing surface is formed between the valve seat and the ball.

[0013] Optionally or preferably, a scraper is provided on the self-cleaning sealing surface, and the scraper includes a fixing part and an extension part;

[0014] An included angle α is formed between the fixed part and the extended part, where 0° < α < 90°.

[0015] Optionally or preferably, a vortex effect zone is formed between the valve seat and the valve body; the vortex effect zone is used to prevent powder from accumulating in the gap between the valve seat and the valve body.

[0016] Optionally or preferably, a sealing element is provided between the valve seat and the spring seat, the sealing element being used to prevent powder from entering the spring cavity.

[0017] Optionally or preferably, the valve stem and the ball are connected by a bearing; a second seal is provided between the valve stem and the bearing; the second seal is used to prevent powder from entering the valve stem cavity.

[0018] Optionally or preferably, a blowout preventer is provided between the ball and the bearing; the blowout preventer is used to prevent the bearing from being ejected under pressure.

[0019] Based on the above technical solution, this utility model can produce at least the following technical effects:

[0020] (1) The self-cleaning and anti-clogging high-frequency wear-resistant ball valve provided by this utility model has a vortex effect zone between the valve seat and the valve body, and a sealing element is provided between the valve seat and the spring seat, thereby preventing powder from entering the valve seat spring cavity and affecting the sealing performance of the valve body.

[0021] (2) By setting a self-cleaning sealing surface and a scraper set on the self-cleaning sealing surface, it has a spherical self-cleaning function. Under the condition that the spring provides a stable pre-tightening force, it can effectively remove a small amount of hardened metal powder and media powder accumulation on the sealing surface. During use, even if the valve seat is constantly worn, the edge of the sealing surface always remains sharp, and the self-cleaning function remains unchanged, increasing the effective reliability of the sealing surface.

[0022] (3) By providing a sealing element 2 between the valve stem and the bearing, the powder in the valve cavity or the dust in the medium can be prevented from entering the valve stem bearing through the gap between the valve body and the valve stem, thereby preventing the valve stem from jamming and the valve body from failing. Attached Figure Description

[0023] Figure 1 It is the structure of a conventional hard-seal ball valve with a standard valve seat;

[0024] Figure 2 This is a schematic diagram of the structure of the self-cleaning and anti-clogging high-frequency wear-resistant ball valve of this utility model;

[0025] Figure 3 This is a partial structural schematic diagram of the self-cleaning valve seat assembly in the self-cleaning and anti-clogging high-frequency wear-resistant ball valve of this utility model;

[0026] Figure 4 This is a partial structural diagram of the self-cleaning sealing surface in the self-cleaning and anti-clogging high-frequency wear-resistant ball valve of this utility model;

[0027] Figure 5 This is a partial structural diagram of the anti-clogging and discharge valve stem in the self-cleaning and anti-clogging high-frequency wear-resistant ball valve of this utility model.

[0028] In the diagram: 1. Valve body; 2. Valve stem; 3. Ball; 4. Self-cleaning valve seat assembly; 41. Valve seat; 42. Spring seat; 43. Spring; 44. Self-cleaning sealing surface; 45. Scraper; 451. Fixing part; 452. Extension part; 46. Seal element one; 5. Vortex effect zone; 6. Bearing; 7. Blowout preventer. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model; obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0030] Example

[0031] Please see Figures 2 to 5 A self-cleaning, anti-clogging high-frequency wear-resistant ball valve includes a valve body 1, a valve stem 2, and a ball 3. In this embodiment, at least four self-cleaning valve seat assemblies 4 are provided inside the valve body 1. The self-cleaning valve seat assemblies 4 are respectively tightly fitted with the ball 3 and form a sealing structure between the balls 3.

[0032] Furthermore, the self-cleaning valve seat assembly 4 includes a spring seat 42 connected to the valve body 1 and a valve seat 41 connected to the spring seat 42. A spring cavity is formed inside the spring seat 42, and a spring 43 is disposed inside the spring cavity. One end of the spring 43 is fixed to the inner wall of the spring cavity, and the other end abuts against the valve seat 41.

[0033] In order to effectively remove trace amounts of hardened metal powder and media powder accumulation on the sealing surface, in this embodiment, a self-cleaning sealing surface 44 is formed between the valve seat 41 and the ball 3.

[0034] Furthermore, a scraper 45 is provided on the self-cleaning sealing surface 44. The scraper 45 includes a fixed part 451 fixedly connected to the valve seat 41 and an extension part 452 connected to the fixed part 451. In order to improve the cleaning effect of the scraper 45, the included angle α between the fixed part 451 and the extension part 452 should be an acute angle. In this embodiment, α = 70°. The self-cleaning sealing surface 44 has a spherical cleaning function. Under the condition that the spring 43 stably provides the pre-tightening force, it can effectively remove the small amount of hardened metal powder and the enrichment of medium powder formed on the sealing surface. During use, even if the valve seat 41 is constantly worn, the edge of the sealing surface always maintains an acute angle, and the self-cleaning function remains unchanged, increasing the effective reliability of the sealing surface.

[0035] To further prevent powder from accumulating in the gap between the valve body 1 and the valve seat 41 of the ball valve and gradually invading the spring cavity, this embodiment adopts an effective angle design between the valve body 1 and the valve seat 41 to form a vortex effect zone 5, which is used to prevent powder from accumulating.

[0036] In addition, a seal 46 is provided between the valve seat 41 and the spring seat 42 to prevent powder from entering the spring cavity; please refer to Figure 2 In this embodiment, valve seat 41 and spring seat 42 are also provided with corresponding seals to prevent powder from entering.

[0037] Please see Figure 5 In this embodiment, the valve stem 2 and the shaft 3 are connected by a bearing 6, and a second seal 61 is provided between the valve stem 2 and the bearing 6. The second seal 61 is used to prevent powder from entering the cavity of the valve stem 2.

[0038] Furthermore, the bearing 6 is made of reinforced PEEK material. While ensuring wear resistance, a blowout preventer 7 is provided between the ball 3 and the bearing 6. This blowout preventer 7 is used to prevent the bearing 6 from being ejected under pipeline pressure when a sealed cavity is formed between the ball 3 and the valve stem 2.

[0039] In addition, the cavity between the ball 3 and the valve stem 2 forms a high-pressure air cushion as the valve stem 2 is installed, avoiding physical contact between the two and reducing friction. Its multiple improved designs ensure that the valve stem 2 and the bearing 6 maintain low torque, good performance, and long-term operation, thereby ensuring the safe operation of the valve.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A self-cleaning anti-blocking high-frequency wear-resistant ball valve, characterized in that, Including valve body (1), valve stem (2) and ball (3), the valve body (1) is provided with a plurality of self-cleaning valve seat assemblies (4), a plurality of the self-cleaning valve seat assemblies (4) are respectively connected with the ball (3) in cooperation; The self-cleaning valve seat assembly (4) includes valve seat (41) and spring seat (42), the spring seat (42) is formed with spring cavity, the spring cavity is provided with spring (43), one end of the spring (43) is fixed with the spring cavity, the other end is abutted with the valve seat (41); The valve seat (41) and the ball (3) form a self-cleaning sealing surface (44).

2. The self-cleaning anti-blocking high-frequency wear ball valve according to claim 1, characterized in that, The self-cleaning sealing surface (44) is provided with a scraper (45), the scraper (45) includes a fixed part (451) and an extension part (452); The fixed part (451) and the extension part (452) form an included angle α, 0°<α<90°.

3. The self-cleaning anti-blocking high-frequency wear ball valve according to claim 2, characterized in that, The valve seat (41) and the valve body (1) form a vortex effect zone (5), the vortex effect zone (5) is used to avoid the gap between the valve seat (41) and the valve body (1) to accumulate powder.

4. The self-cleaning anti-blocking high-frequency wear ball valve according to claim 2, characterized in that, The valve seat (41) and the spring seat (42) are provided with a sealing element (46), the sealing element (46) is used to avoid the powder into the spring cavity.

5. The self-cleaning anti-jamming high-frequency wear-resistant ball valve according to claim 1, characterized in that, The valve stem (2) and the ball (3) are connected through the bearing (6), the valve stem (2) and the bearing (6) are provided with a sealing element (61), the sealing element (61) is used to avoid the powder into the valve stem cavity.

6. The self-cleaning anti-blocking high-frequency wear ball valve according to claim 5, characterized in that, The ball (3) and the bearing (6) are provided with a blowout prevention groove (7), the blowout prevention groove (7) is used to avoid the bearing (6) is sprayed under the action of pressure.

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