Sealing plate type dust removal hard seal discharging flow control valve

Abstract

The invention relates to the technical field of valves, and discloses a sealing plate type dust removal hard seal discharging flow control valve which comprises a flow control valve body, a support is connected to the top of the flow control valve body, a dish plate is arranged in the flow control valve body, an upper valve rod is connected to the top of the dish plate, and a lower valve rod is connected to the top of the dish plate. The bottom of the butterfly plate is connected with a lower valve rod, the outer side of the upper valve rod is sleeved with an upper shaft sleeve, the outer side of the lower valve rod is sleeved with a lower shaft sleeve, the upper shaft sleeve is arranged in the top of the flow control valve body, the lower shaft sleeve is arranged in the bottom of the flow control valve body, and a lower gland is arranged at the bottom of the flow control valve body. The annular elastic material is arranged on the hard sealing face of the valve body of the flow control valve, when the butterfly plate is closed, the elastic layer is pressed to deform, abrasion or unevenness is compensated, the sealing performance is enhanced, the butterfly plate is made of the hard material, the overall strength is ensured, the problems of untight sealing and abrasion are solved, and leakage is reduced through elastic compensation.

Description

Technical Field

[0001] This invention relates to the field of valve technology, specifically to a plate-type dust removal hard-seal unloading flow control valve. Background Technology

[0002] In modern industrial production, dust removal systems, pneumatic conveying systems, and powder unloading equipment are widely used in industries such as chemical, metallurgy, cement, power, and building materials. To achieve quantitative conveying and precise flow control of materials between pipelines or storage silos, unloading flow control valves are typically required. Among various valve types, the plate-type dust collector hard-seal unloading flow control valve (also known as a hard-seal butterfly valve or flap valve) is widely used due to its compact structure, small size, convenient operation, and rapid opening and closing. This type of valve generally controls the opening and closing of the fluid passage by rotating a disc inside the valve body. It has a simple structure, low manufacturing cost, and is suitable for regulating and cutting off low-pressure media such as dust, gas, and particulate matter.

[0003] However, traditional hard-seal, plate-type dust collector unloading flow control valves still face several technical bottlenecks. First, hard-seal structures typically employ direct metal-to-metal contact sealing, such as combinations of stainless steel and carbon steel, or cast iron and alloy steel. Since the working environment often contains high concentrations of dust or solid particles, this rigid seal is prone to wear during frequent opening and closing. Even minor scratches, corrosion, or abrasion on the sealing surface can significantly reduce the valve's sealing performance, leading to leaks, jamming, or malfunctions. Second, hard-seal butterfly valves are usually designed as a single unit, with the disc, stem, and body often welded or cast as a single piece. Once the disc wears severely, the entire valve needs to be replaced, increasing maintenance costs and disrupting production continuity.

[0004] Furthermore, after long-term operation, existing hard-seal valves may develop minute gaps between the mating surfaces of the disc and the valve seat due to factors such as temperature stress, material erosion, and assembly deviations. Rigid metal seals cannot automatically compensate for these gaps, leading to increased valve leakage rates. This is especially problematic in dust removal or powder conveying applications, where it can easily cause a chain reaction of problems such as material accumulation, sealing surface jamming, or accelerated wear. On the other hand, the sealing performance of hard-seal valves relies on extremely high machining precision and assembly concentricity. If assembly errors or deformation exceed tolerances, issues such as difficulty in opening and closing, increased torque, or even jamming may occur.

[0005] In summary, traditional plate-type dust collector hard-seal unloading flow control valves generally suffer from the following problems: poor sealing, easy leakage, affecting unloading accuracy and dust collection efficiency; the disc and valve seat cannot be partially replaced after wear, leading to the scrapping of the entire valve; the sealing structure lacks elastic compensation and cannot cope with the gaps that develop after long-term use; the structure is complex to maintain, the maintenance cycle is short, and the service life is limited; some valve bodies may become stuck or the sealing surface may be scratched under long-term high-frequency opening and closing, resulting in performance degradation. Therefore, there is an urgent need for a plate-type dust collector hard-seal unloading flow control valve to solve the above technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a plate-type dust collector hard seal unloading flow control valve to solve the problems mentioned in the background art, such as poor sealing and severe wear during use, which easily leads to leakage; secondly, the disc cannot be replaced after wear, usually requiring the entire valve to be scrapped, resulting in short valve life and high maintenance costs.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A plate-type dust collector hard-seal unloading flow control valve includes a flow control valve body, a bracket connected to the top of the flow control valve body, a disc plate disposed inside the flow control valve body, an upper valve stem connected to the top of the disc plate, a lower valve stem connected to the bottom of the disc plate, an upper bushing fitted on the outer side of the upper valve stem, and a lower bushing fitted on the outer side of the lower valve stem. The upper bushing is disposed inside the top of the flow control valve body, and the lower bushing is disposed inside the bottom of the flow control valve body. A lower pressure cover is disposed at the bottom of the flow control valve body. The lower end of the lower valve stem passes through the bottom of the flow control valve body and extends into the lower pressure cover. The top of the upper valve stem passes through the flow control valve body and the bracket from bottom to top and is connected to a worm gear. Wear-resistant blocks are disposed on the inner sidewall of the flow control valve body. Several mounting holes are opened at the upper edge of the flow control valve body. External threads are provided on the outer side of one end of both the lower and upper valve stems. Internal threads are provided at the connection points between the disc plate and the lower and upper valve stems.

[0008] As a preferred embodiment of the present invention, the lower valve stem is threadedly connected to the bottom of the disc plate by an external thread on the outer side.

[0009] As a preferred embodiment of the present invention, the upper valve stem is threadedly connected to the disc plate top by an external thread on the outer side.

[0010] As a preferred embodiment of the present invention, the wear-resistant block is in the shape of a ring structure.

[0011] As a preferred embodiment of the present invention, the wear-resistant block is made of polyurethane elastic material.

[0012] As a preferred embodiment of the present invention, the wear-resistant block is positioned directly opposite the disc plate, and the inner sidewall of the wear-resistant block is in close contact with the outer sidewall of the disc plate, but the two are not connected.

[0013] As a preferred embodiment of the present invention, the disc is made of cast iron hard material.

[0014] As a preferred embodiment of the present invention, the lower valve stem can rotate within the lower pressure cover, and the length of the lower valve stem is less than the length of the upper valve stem.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. Significantly improved sealing performance and excellent leak prevention: This invention, based on traditional hard seals, incorporates an annular wear-resistant block on the inner wall of the valve body, using polyurethane elastic material as the sealing contact layer. When the disc is closed, the hard metal edge of the disc contacts the elastic wear-resistant block, forming a flexible contact surface. Under the clamping force of the disc, the polyurethane undergoes slight elastic deformation, thereby filling gaps caused by machining tolerances, assembly errors, or long-term wear, achieving automatic compensation. Even after a period of use, when the sealing surface wears down, the elastomer continues to maintain a tight fit, significantly improving sealing reliability and effectively preventing dust or gas leakage.

[0016] 2. The design allows for detachable and replaceable components, significantly reducing maintenance costs. The disc and upper / lower valve stems of this invention utilize a threaded, detachable connection structure, avoiding the overall scrapping problem caused by the integrated disc and stem in traditional hard-seal butterfly valves. When the disc is severely worn, a new disc can be replaced simply by unscrewing the threaded interface, without replacing the entire valve body. This structure greatly simplifies maintenance, reduces spare parts costs, extends equipment lifespan, and improves the economy and reliability of the valve under continuous operating conditions.

[0017] 3. Balancing hard seal strength with flexible compensation characteristics: The disc is made of hard materials such as cast iron or alloy steel to ensure strength and rigidity, capable of withstanding high pressure differentials and particle erosion; while the wear-resistant block is made of highly elastic and wear-resistant materials such as polyurethane, forming a flexible layer on the sealing surface, achieving a "rigid-flexible combination" sealing form. This structure achieves flexible compensation function in hard-seal valves, effectively overcoming the defects of traditional hard-seal valves such as excessive sealing rigidity, easy wear, and micro-leakage, making it suitable for flow control of complex media such as dust, particles, and high-temperature gases.

[0018] 4. Compact structure, flexible assembly, and reliable transmission; the upper valve stem is driven by a worm gear to achieve 0°~90° rotation of the disc; the lower valve stem is supported in the lower pressure cover and can rotate freely, forming a double support structure that stabilizes the disc rotation and prevents wobbling or eccentricity. The worm gear transmission structure allows for precise control of the opening and closing angle, easy operation, and low opening and closing torque. The overall structural layout is reasonable, facilitating installation in dust collection pipelines, unloading ports, or pneumatic conveying nodes.

[0019] 5. High wear resistance, adaptable to harsh working conditions; the polyurethane wear-resistant blocks inside the valve body not only have excellent elastic sealing performance, but also effectively resist wear caused by dust and particle erosion. They form a uniformly distributed pressure ring with the disc contact surface, avoiding localized wear or point contact wear. Their excellent impact resistance and resilience allow the valve to maintain good sealing performance and opening / closing flexibility even under high-frequency opening and closing conditions.

[0020] 6. Outstanding economic benefits and engineering adaptability: The modular and replaceable structural design of this invention allows companies to replace only consumable parts (disc plates or sealing blocks) during use, reducing the number of whole valve replacements and minimizing equipment downtime for maintenance. Furthermore, its universal interface and compact structure allow it to directly replace existing standard hard-seal butterfly valves without requiring modifications to the piping system, demonstrating excellent scalability and versatility.

[0021] 7. Safe and reliable, stable operation; the upper and lower valve stems are supported by bushings, ensuring smooth movement and preventing valve jamming or sealing failure due to vibration or eccentricity; the worm gear drive structure provides a self-locking function to prevent accidental valve opening under vibration or pressure shock, improving system safety. The entire valve body is made of wear-resistant metal material, with a robust structure, suitable for high dust, high wear, and large temperature variation conditions.

[0022] In summary, this invention not only achieves high strength and high wear resistance in a hard-seal structure, but also realizes a flexible sealing effect through elastic compensation, combining advantages such as reliable sealing, convenient maintenance, and long service life. This solution has broad application prospects and significant economic value in fields such as powder conveying, dust removal and unloading, and chemical reaction material control. Attached Figure Description

[0023] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of a plate-type dust collector hard seal unloading flow control valve according to the present invention; Figure 2 This is a schematic cross-sectional view of the connection relationship between the upper valve stem, disc plate, and lower valve stem of a plate-type dust collector hard seal unloading flow control valve of the present invention. Figure 3This is a cross-sectional side view of the internal connection relationship of the flow control valve body of a plate-type dust collector hard seal unloading flow control valve according to the present invention. Figure 4 This is a partially enlarged structural schematic diagram of a plate-type dust collector hard-seal unloading flow control valve according to the present invention; Figure 5 This is a schematic diagram of the connection between the bracket and the worm gear of the present invention; In the diagram: 1. Flow control valve body; 2. Bracket; 3. Worm gear; 4. Upper valve stem; 5. Disc; 6. Wear-resistant block; 7. Lower pressure cap; 8. Mounting hole; 9. Lower valve stem; 10. External thread; 11. Upper bushing; 12. Lower bushing. Detailed Implementation

[0024] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. In the embodiments of the present invention, the different types of cross-sectional lines are not labeled according to national standards, nor do they specify material requirements for the components; they are used to distinguish the cross-sectional views of the components.

[0025] Please see Figure 1-5 A plate-type dust collector hard-seal unloading flow control valve includes a flow control valve body 1, a bracket 2 connected to the top of the flow control valve body 1, a disc 5 disposed inside the flow control valve body 1, an upper valve stem 4 connected to the top of the disc 5, a lower valve stem 9 connected to the bottom of the disc 5, an upper bushing 11 sleeved on the outer side of the upper valve stem 4, and a lower bushing 12 sleeved on the outer side of the lower valve stem 9. The upper bushing 11 is located inside the top of the flow control valve body 1, and the lower bushing 12 is located inside the bottom of the flow control valve body 1. The bottom of the valve body 1 is provided with a lower pressure cover 7. The lower end of the lower valve stem 9 passes through the bottom of the flow control valve body 1 and extends into the lower pressure cover 7. The top of the upper valve stem 4 passes through the flow control valve body 1 and the bracket 2 from bottom to top and is connected to the worm gear 3. Wear-resistant blocks 6 are provided on the inner side wall of the flow control valve body 1. Several mounting holes 8 are opened at the upper edge of the flow control valve body 1. External threads 10 are provided on the outer side of one end of the lower valve stem 9 and the upper valve stem 4. Internal threads are provided at the connection between the disc 5 and the lower valve stem 9 and the upper valve stem 4.

[0026] The lower valve stem 9 is threadedly connected to the disc plate 5, which has an internal thread, through an external thread 10 on its outer side.

[0027] The upper valve stem 4 is threadedly connected to the disc 5, which has an internal thread on its top, via an external thread 10 on its outer side. This allows the disc 5 to be replaced after wear, eliminating the need to scrap the entire valve, thus extending the valve's lifespan and reducing maintenance costs.

[0028] Among them, the wear-resistant block 6 has a ring-shaped structure.

[0029] Among them, the wear-resistant block 6 is made of polyurethane elastic material. By setting an annular elastic material on the hard sealing surface of the flow control valve body 1, when the disc 5 is closed, the elastic layer is deformed under pressure to compensate for wear or unevenness and enhance the sealing performance. The disc is made of hard material to ensure overall strength, solve the problems of poor sealing and wear, and reduce leakage through elastic compensation.

[0030] The wear-resistant block 6 is positioned directly opposite the disc plate 5, and the inner wall of the wear-resistant block 6 is in close contact with the outer wall of the disc plate 5, but the two are not connected.

[0031] Among them, the disc plate 5 is made of hard cast iron material.

[0032] The lower valve stem 9 can rotate within the lower pressure cover 7, and the length of the lower valve stem 9 is less than the length of the upper valve stem 4. Example

[0033] In this embodiment, the flow control valve body is made of stainless steel, the disc is made of high-strength cast iron, and the wear-resistant block is made of polyurethane elastomer. Both ends of the valve body are connected to the dust collection pipeline via flanges. A worm gear drive mechanism is mounted on the upper valve stem via a bracket. When the worm gear rotates, the disc rotates within the valve body, achieving on / off control of the airflow channel. The polyurethane annular wear-resistant block on the inside of the valve body is pressed against the disc when the valve is closed, forming an elastic seal. Even if slight wear occurs at the edge of the disc, the polyurethane layer can still compensate for the gap through deformation, maintaining a tight seal. This embodiment has a simple structure and is suitable for dust collection and unloading applications involving the conveying of dust, particles, or gaseous-solid mixtures. It features reliable sealing, flexible opening and closing, and convenient maintenance. Example

[0034] In this embodiment, to adapt to high-temperature gas conveying systems, the wear-resistant blocks are made of high-temperature resistant polyurethane composite material, capable of long-term operation at 120℃. The discs are made of nickel-chromium alloy steel, with a nitrided surface to enhance wear resistance and corrosion resistance. The worm gear transmission structure is equipped with an external sealing cover to prevent dust from entering the gear cavity. The valve maintains a stable seal even when operating in high-temperature dust removal pipelines; the polyurethane layer softens slightly upon heating, which actually improves the sealing effect and prevents leakage through metal gaps caused by thermal expansion. This embodiment is suitable for flow control of high-temperature dusty fluids such as blast furnace flue gas and boiler exhaust gas in metallurgical applications. Example

[0035] This embodiment is optimized for high-frequency opening and closing conditions. The upper and lower valve stems are made of bearing steel and fitted with ceramic-coated bushings to reduce friction. An anti-loosening structure is added to the threaded interface between the disc and the valve stem to prevent loosening due to frequent operation. The wear-resistant block is made of modified polyurethane material, improving impact resistance by 30%. After 10,000 consecutive opening and closing cycles, the sealing performance did not significantly decrease. This embodiment is suitable for cement production line powder unloading systems, can operate stably for long periods, and exhibits excellent wear resistance and fatigue resistance. Example

[0036] This embodiment adds an inspection port at the connection between the disc and the valve body for easy and quick disc replacement. The disc is connected to the upper and lower valve stems via threads. When maintenance is required, simply remove the bracket and inspection cover to unscrew the disc for replacement. The wear-resistant block adopts a modular embedded design and can be individually disassembled and installed. This structure significantly reduces maintenance time and minimizes downtime losses. This embodiment is particularly suitable for powder conveying pipeline systems that require regular maintenance or replacement of seals, such as grain processing and chemical powder conveying applications.

[0037] The working principle and usage process of this invention: First, the core working principle of this flow control valve is based on a disc rotating in the valve body to realize the opening, closing and flow regulation of the flow channel. Its ingenious design is that it combines the durability of hard seals with the sealing compensation of elastic materials, and achieves easy maintenance and long service life through a detachable structure. When the valve needs to be operated, the operator rotates the worm gear 3 installed on the top of the bracket. The worm gear 3 drives the upper valve stem 4 connected to it to rotate. The upper valve stem 4 engages with the internal thread on the top of the disc plate 5 through the external thread 10 at its bottom, transmitting the rotational motion to the disc plate. The bottom of the disc plate is also connected to the lower valve stem 9 through threads. The lower end of the lower valve stem 9 is supported in the lower pressure cover 7 and can rotate freely. In this way, the disc plate 5 is stably supported in the center of the valve body by the upper and lower valve stems and can rotate together with the valve stems. When the valve is opened, when the worm gear 3 drives the valve stem and disc 5 to rotate about 90 degrees, the plane of the disc 5 is parallel to the direction of fluid flow, the channel is opened to the maximum, and materials (such as dust, particles, etc.) can pass through smoothly. When adjusting; By controlling the rotation angle of the worm gear 3 (e.g., between 0° and 90°), the opening angle of the disc 5 can be precisely controlled. The disc 5 acts as a throttling element. The smaller its opening angle, the smaller the flow cross-sectional area and the greater the resistance to fluid flow, thereby achieving precise control of the flow rate. This is crucial for unloading and process control. When closed, when the worm gear 3 drives the disc 5 to rotate to approximately 0 degrees, the plane of the disc 5 is perpendicular to the fluid flow direction, completely blocking the flow channel. The valve body is equipped with an annular wear-resistant block 6 made of polyurethane elastic material, while the disc 5 is made of cast iron hard material, ensuring the strength of the overall structure. During valve closing, the edge of the hard disc gradually approaches and eventually presses against the annular elastic wear-resistant block. Due to the elasticity of polyurethane, the wear-resistant block 6 will produce a slight elastic deformation under the pressing force of the disc. Even if the disc 5 or wear-resistant block 6 wears due to long-term use, the elastomer can still deform under pressure, filling the tiny gaps caused by wear and maintaining close contact. This can compensate for the microscopic unevenness of the sealing surface that may be caused by processing or installation, ensuring uniform contact throughout the circumference. This contact method of using softness to overcome hardness has a better sealing effect than simple hard-on-hard sealing and can effectively prevent the leakage of small particles. It is especially suitable for dust removal and unloading conditions. The disc 5 is connected to the upper and lower valve stems by threads. When the disc 5 wears down after long-term use and needs to be replaced, it is not necessary to replace the entire valve. The maintenance personnel can open the valve body or through a specific inspection port, unscrew the threaded connection between the upper and lower valve stems and the disc 5, remove the old disc, and replace it with a new disc. The main structural components such as the valve body, bracket, and valve stem can continue to be used, which greatly extends the service life of the entire valve. Only the relatively low-cost disc 5 component needs to be replaced, avoiding the high cost of scrapping the entire valve and simplifying the spare parts inventory. The upper and lower valve stems are driven by a worm gear mechanism, which in turn rotates the central disc 5 to achieve flow channel opening and closing and flow regulation. When closed, the hard disc 5 presses against the annular elastic wear-resistant block 6 on the valve body, using the deformation of the elastic body to compensate for wear and unevenness, thus achieving a reliable seal. At the same time, the threaded connection design between the disc 5 and the valve stem allows the core vulnerable component, the disc 5, to be replaced independently. This significantly improves the durability and economy of the valve while ensuring sealing performance. This design is very suitable for use as a key component for unloading and flow control in industrial dust removal and material conveying systems with large dust volumes and abrasive media. The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0038] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A plate-type dust collector hard-seal unloading flow control valve, comprising a flow control valve body (1), characterized in that: A bracket (2) is connected to the top of the flow control valve body (1). A disc (5) is provided inside the flow control valve body (1). An upper valve stem (4) is connected to the top of the disc (5). A lower valve stem (9) is connected to the bottom of the disc (5). An upper bushing (11) is fitted on the outside of the upper valve stem (4). A lower bushing (12) is fitted on the outside of the lower valve stem (9). The upper bushing (11) is located inside the top of the flow control valve body (1). The lower bushing (12) is located inside the bottom of the flow control valve body (1). A pressure bar is provided at the bottom of the flow control valve body (1). The lower end of the lower valve stem (9) passes through the bottom of the flow control valve body (1) and extends into the lower pressure cover (7). The top of the upper valve stem (4) passes through the flow control valve body (1) and the bracket (2) from bottom to top and is connected to the worm gear (3). Wear-resistant blocks (6) are provided on the inner side wall of the flow control valve body (1). Several mounting holes (8) are opened at the upper edge of the flow control valve body (1). External threads (10) are provided on the outer side of one end of the lower valve stem (9) and the upper valve stem (4). Internal threads are provided at the connection between the disc (5) and the lower valve stem (9) and the upper valve stem (4).

2. The sealing plate type dust collector hard seal unloading flow control valve according to claim 1, characterized in that: The lower valve stem (9) is threadedly connected to the disc plate (5) at the bottom by an external thread (10) on the outside.

3. The sealing plate type dust collector hard seal unloading flow control valve according to claim 1, characterized in that: The upper valve stem (4) is threadedly connected to the disc plate (5) with an internal thread on the top through an external thread (10) on the outside.

4. The sealing plate type dust collector hard seal unloading flow control valve according to claim 1, characterized in that: The wear-resistant block (6) has a ring-shaped structure.

5. The sealing plate type dust collector hard seal unloading flow control valve according to claim 1, characterized in that: The wear-resistant block (6) is made of polyurethane elastic material.

6. The sealing plate type dust collector hard seal unloading flow control valve according to claim 1, characterized in that: The wear-resistant block (6) is positioned directly opposite the disc plate (5), and the inner wall of the wear-resistant block (6) is in close contact with the outer wall of the disc plate (5), but the two are not connected.

7. The sealing plate type dust collector hard seal unloading flow control valve according to claim 1, characterized in that: The disc (5) is made of cast iron hard material.

8. The sealing plate type dust collector hard seal unloading flow control valve according to claim 1, characterized in that: The lower valve stem (9) can rotate in the lower pressure cover (7), and the length of the lower valve stem (9) is less than the length of the upper valve stem (4).

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