Self-cleaning rotary valve

Abstract

The utility model provides a kind of self-cleaning rotary valve, including box, the upper end surface of box is equipped with feed inlet, the lower end surface is equipped with discharge port, impeller is rotationally equipped in the box, the feed inlet of the box is equipped with scraper corresponding to the side of meeting impeller rotation direction, scraper one end points to the direction of impeller outer edge, and gap is present between the end of scraper and impeller outer edge, the gap is adjustable gap, and the other end of scraper is adjustably connected with the feed inlet of box.The utility model corresponds to the rotation direction of impeller, and the sidewall of feed inlet is designed scraper on the side of meeting impeller, and the guide plate of same side provides blanking guide for discharging on one hand, and also provides block for the accumulated material on the surface of scraper on the other hand, to avoid the accumulation of scraping on the surface of scraper, self-cleaning can be realized in the process of discharging, effectively reduce the accumulated material phenomenon in the process of discharging, conducive to prolonging maintenance cleaning interval, prolong the service life of rotary valve.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a self-cleaning rotary valve. Background Technology

[0002] A rotary valve is a device that uses rotating components, such as a baffle or impeller, to open and close the valve and convey materials. It can be used in pneumatic conveying systems or powder / granular material handling systems to achieve stable feeding, airflow control, and uniform metering. A rotary valve typically includes a housing with an inlet at the top and an outlet at the bottom. Inside the housing is a rotor. Material falls into the housing through the inlet and is conveyed to the outlet as the rotor rotates, thus achieving continuous feeding.

[0003] In rotary valve design, when an impeller is used as the rotor, a small gap (usually 0.1-0.5mm) must be maintained between the impeller and the inner wall of the casing to ensure smooth rotation without jamming. This gap is a necessary design for normal operation of the equipment, but it also provides space for material to accumulate at the impeller end. When the impeller rotates, material falls from the upper hopper into the impeller cavity and rotates with the impeller to the lower outlet. During rotation, some fine powder or granular material may be squeezed or adhered to the gap between the impeller edge and the casing due to gravity, centrifugal force, or airflow, forming material accumulation. When the conveyed material has a certain viscosity and poor flowability, it is easy to accumulate at the impeller edge. After the material accumulates, the impeller edge or the inner wall of the casing is more prone to wear due to friction during rotation, leading to an increase in the gap. The worn gap is more likely to accumulate material, forming a vicious cycle.

[0004] Therefore, how to improve the rotary valve to address the problem of material accumulation at the impeller edge has become the focus of current improvement designs. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a self-cleaning rotary valve that can automatically scrape and clean the impeller edge simultaneously with the material feeding, so as to avoid material adhering and accumulating on the impeller edge.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a self-cleaning rotary valve, including a housing, with a feed inlet on the upper end face and a discharge outlet on the lower end face. An impeller is rotatably installed inside the housing. A scraper is provided on the side of the feed inlet of the housing corresponding to the direction of rotation of the impeller. One end of the scraper points towards the outer edge of the impeller, and there is a gap between this end of the scraper and the outer edge of the impeller. This gap is adjustable. The other end of the scraper is tunably connected to the feed inlet of the housing.

[0007] In the above solution, to address the problem of material accumulation on the outer edge of the existing impeller, a scraper is designed at the feed inlet position in the direction of the impeller, and the gap is adjusted so that when the impeller rotates, the material accumulated on the outer edge of the impeller can be automatically scraped off by the scraper, achieving a self-cleaning effect on the outer edge of the impeller.

[0008] Furthermore, the adjustable gap adjustable connection structure is achieved through an elongated hole. The scraper includes a scraping part and a connecting part integrally formed on the side of the scraping part. The end of the scraping part along the axial length of the impeller is a pointed tip, which points to the outer edge of the impeller and has an adjustable gap with the outer edge of the impeller. The connecting part has several horizontal elongated holes, which are arranged horizontally along their length. The feed inlet of the housing has a transverse positioning hole corresponding to each horizontal elongated hole. The scraper is adjusted horizontally connected to the feed inlet by connecting bolt assemblies between the horizontal elongated holes and the transverse positioning holes.

[0009] Furthermore, to better ensure the material scraping effect of the cutter tip, the upper surface of the tip is an upward-sloping upper surface, and the lower surface is a downward-sloping lower surface. The lower surface is tangentially set parallel to the outer edge of the impeller, and the gap between the lower surface and the outer edge of the impeller is the adjustable gap. The tangentially set lower surface can better adapt to the impeller rotation direction and achieve a better scraping effect on the impeller edge without interfering with the impeller rotation.

[0010] Furthermore, to prevent the material scraped by the scraper from accumulating on the scraper surface, the feed inlet of the housing has two sides corresponding to the impeller rotation direction. One side faces the impeller rotation direction and has a guide plate. The upper end of the guide plate is adjustablely connected to the feed inlet of the housing, and the lower end is angled towards the upper surface of the scraping part of the scraper. The other side faces away from the impeller rotation direction and has a discharge ramp. The discharge ramp is fixed to the feed inlet of the housing. The guide plate effectively blocks the material above the scraper and guides the accumulated material, preventing it from piling up excessively and allowing it to move downwards along the guide plate as the material falls.

[0011] Furthermore, the guide plate and the upper surface of the scraper are adjustable. The guide plate includes a vertical part and an integrally formed inclined part at the lower end of the vertical part. The vertical part has several vertical elongated oval holes, the length of which is along the height direction of the box. A vertical positioning hole is provided at the feed inlet of the box corresponding to each vertical elongated oval hole. The vertical part is adjustablely connected to the feed inlet in the vertical direction by bolt assemblies connecting the vertical elongated oval holes and the vertical positioning holes. The inclined part points diagonally downwards towards the scraping part of the scraper. The guide plate can be adjusted in the height direction through the vertical elongated oval holes. This allows adjustment of the gap between the lower edge of the guide plate and the scraper according to the position of the upper surface of the scraper, ensuring that the lower edge of the guide plate can abut against or be very close to the scraper. This prevents the gap from being too large, which could cause material to enter the rear end of both the guide plate and the scraper, resulting in material accumulation at the rear end.

[0012] Furthermore, to facilitate cleaning and maintenance of the inlet and outlet, the housing is provided with cleaning ports on the sides corresponding to the inlet and outlet, respectively. Each cleaning port is detachably connected to a cleaning port cover, and the cleaning ports are located on the side facing the impeller rotation direction. That is, for the inlet, the cleaning port is located on the side with the guide plate and scraper, which allows for easy opening of the cleaning port and cleaning of the scraper and guide plate.

[0013] Preferably, a handle is fixed to the cleaning port cover.

[0014] The beneficial effects of this utility model are that the self-cleaning rotary valve provided by this utility model has a reasonable structural design. Corresponding to the impeller rotation direction, the feed inlet has a scraper designed on the side wall facing the impeller. The guide plate on the same side provides material guidance for feeding and also blocks the accumulation of material on the scraper surface, preventing the scraped material from accumulating on the scraper surface. Self-cleaning can be achieved during the feeding process, effectively reducing the accumulation of material during the feeding process, which is conducive to extending the maintenance and cleaning interval and extending the service life of the rotary valve. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the preferred embodiment of the present invention.

[0017] Figure 2 This is a perspective view of the impeller, scraper, and guide plate in the preferred embodiment of this utility model.

[0018] Figure 3 This is a schematic diagram of the scraper in the preferred embodiment of this utility model.

[0019] In the figure: 1. Guide plate; 11. Vertical part; 12. Angled part; 13. Vertical elongated hole; 2. Scraper; 21. Scraping part; 22. Connecting part; 23. Horizontal elongated hole; 24. Upper inclined surface; 25. Lower inclined surface; 3. Impeller; 4. Cleaning port cover plate; 5. Box body. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components relevant to the present invention. Orientations and references (e.g., up, down, left, right, etc.) are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0021] like Figure 1 and Figure 2 The self-cleaning rotary valve shown is the preferred embodiment of this utility model. The self-cleaning rotary valve includes a housing 5, with an inlet on the upper end face and an outlet on the lower end face, and an impeller 3 rotatably mounted inside the housing 5.

[0022] In this embodiment, the impeller 3 rotates clockwise, with the feed inlet located above the impeller 3 and the discharge outlet located below it. Corresponding to the feed inlet position, the right side of the feed inlet faces the direction that receives the rotation of the impeller 3.

[0023] In this embodiment, in order to effectively achieve the self-cleaning effect of the outer edge of the impeller 3 when it rotates, a scraper 2 is provided on the right side of the feed inlet of the housing 5. One end of the scraper 2 points towards the outer edge of the impeller 3, and there is a gap between this end of the scraper 2 and the outer edge of the impeller 3. This gap is adjustable. The adjustable gap can be adjusted through an elongated hole.

[0024] Specifically, such as Figure 2 and Figure 3 As shown, the scraper 2 includes a scraping section 21 and a connecting section 22 integrally formed on the side of the scraping section 21. The end of the scraping section 21 along the axial length of the impeller 3 is a pointed tip, which points towards the outer edge of the impeller 3. To ensure the scraping effect of the tip of the cutter, the upper surface of the tip is an upward-sloping upper surface 24, and the lower surface is a downward-sloping lower surface 25. The lower surface 25 is tangentially arranged parallel to the outer edge of the impeller 3. The tangentially arranged lower surface 25 can better adapt to the rotation of the impeller 3, and achieve a better scraping effect on the edge of the impeller 3 without interfering with the rotation of the impeller 3. The gap between the lower surface and the outer edge of the impeller 3 is the adjustable gap.

[0025] To address this, several horizontal elongated holes 13 are equally spaced along the axial direction of the impeller 3 on the connecting part 22, with the length of the horizontal elongated holes 13 arranged horizontally. A transverse positioning hole is provided at the feed inlet of the housing 5 corresponding to each horizontal elongated hole 13. The scraper 2 is horizontally adjustable to the feed inlet by connecting bolt assemblies between the horizontal elongated holes 13 and the transverse positioning holes.

[0026] When assembling scraper 2, the adjustable gap needs to be designed reasonably according to the position of the outer edge of impeller 3 and the characteristics of the material (particle size, viscosity, etc.), and the position of scraper 2 should be adjusted as needed. This allows the scraper 2 to automatically scrape away the material accumulated on the outer edge of impeller 3 when impeller 3 rotates, achieving a self-cleaning effect on the outer edge of impeller 3.

[0027] Meanwhile, to prevent the material scraped by the scraper 2 from accumulating on its surface, further design is needed at the feed inlet of the housing 5. Specifically, the left side of the feed inlet of the housing 5 is opposite to the rotation direction of the impeller 3, and this side has a discharge ramp. The discharge ramp is fixed to the feed inlet of the housing 5 and is used to guide the material as it falls.

[0028] The right side of the feed inlet of the housing 5 faces the rotation direction of the impeller 3, which is the direction of the scraper 2. In this embodiment, a guide plate 1 is adjustablely installed on this side of the feed inlet, with the lower end of the guide plate 1 angled towards the upper end face of the scraping part 21 of the scraper 2. The guide plate 1 effectively blocks the material above the scraper 2 and provides guidance for the accumulated material, preventing it from piling up excessively and allowing it to move downwards along the guide plate 1 at an angle as the material falls.

[0029] The guide plate 1 and the upper end face of the scraper 2 are adjustable. The guide plate 1 includes a vertical part 11 and an inclined part 12 integrally formed at the lower end of the vertical part 11. The vertical part 11 is adjustablely connected to the right side of the feed port of the box body 5 in terms of height. The inclined part 12 points obliquely downward to the scraping part 21 of the scraper 2.

[0030] Specifically, such as Figure 2 As shown, the adjustable setting of the vertical section 11 is also achieved through elongated holes. Several vertical elongated holes 13 are evenly spaced along the axial direction of the impeller 3 on the vertical section 11, with the length direction of the vertical elongated holes 13 along the height direction of the housing 5. A vertical positioning hole is provided on the right side of the feed inlet of the housing 5 corresponding to each vertical elongated hole 13. The vertical section 11 is adjustablely connected to the feed inlet in the vertical direction by corresponding bolt assemblies connecting the vertical elongated holes 13 and the vertical positioning holes.

[0031] The guide plate 1 can be adjusted in height by means of the vertical elongated hole 13. In this way, the gap between the lower edge of the guide plate 1 and the scraper 2 can be adjusted according to the position of the upper end face of the scraper 2, so as to ensure that the lower edge of the guide plate 1 can abut or be infinitely close to the scraper 2, and avoid the gap between the two being too large, which would cause the material to enter the rear end position of both from the gap between the lower edge of the guide plate 1 and the scraper 2, resulting in material accumulation at the rear end position.

[0032] Meanwhile, to address potential material accumulation, and to facilitate cleaning and maintenance of the inlet and outlet, the housing 5 has cleaning ports on the sides corresponding to the inlet and outlet. Each cleaning port is detachably connected to a cleaning port cover 4 via bolts, and a handle is fixed to the cleaning port cover 4. For the inlet, the cleaning port is located on the side with the guide plate 1 and scraper 2, allowing for easy opening and cleaning of the scraper 2 and guide plate 1. For the outlet, the cleaning port is located on the left side of the impeller 3, facing the direction of impeller 3 rotation, where material accumulation is more likely to occur; therefore, it is more reasonable to have the cleaning port on this side.

[0033] The self-cleaning rotary valve designed in this way has a scraper 2 on the side wall facing the impeller 3 at the feed inlet. The guide plate 1 on the same side provides material guidance for feeding and also blocks the accumulation of material on the surface of the scraper 2, preventing the scraped material from accumulating on the surface of the scraper 2. It can achieve self-cleaning during the feeding process, effectively reducing the accumulation of material during the feeding process, which is conducive to extending the maintenance and cleaning interval and extending the service life of the rotary valve.

[0034] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A self-cleaning rotary valve, comprising a housing, an inlet on the upper surface of the housing and an outlet on the lower surface, wherein an impeller is rotatably disposed within the housing, characterized in that: The feed inlet of the housing is provided with a scraper on the side facing the direction of impeller rotation. One end of the scraper points towards the outer edge of the impeller, and there is a gap between this end of the scraper and the outer edge of the impeller. This gap is adjustable. The other end of the scraper is tunably connected to the feed inlet of the housing.

2. The self-cleaning rotary valve as described in claim 1, characterized in that: The scraper includes a scraping part and a connecting part integrally formed on the side of the scraping part. The end of the scraping part along the axial length of the impeller is a pointed tip, which points to the outer edge of the impeller and has an adjustable gap with the outer edge of the impeller. The connecting part has several horizontal elongated holes, which are arranged horizontally along their length. The feed inlet of the housing has a transverse positioning hole corresponding to each horizontal elongated hole. The scraper is adjustablely connected to the feed inlet in the horizontal direction by connecting bolt assemblies between the horizontal elongated holes and the transverse positioning holes.

3. The self-cleaning rotary valve as described in claim 2, characterized in that: The tip has an upward-sloping upper surface and a downward-sloping lower surface. The lower surface is parallel to the outer edge of the impeller and is tangentially arranged. The gap between the lower surface and the outer edge of the impeller is the adjustable gap.

4. The self-cleaning rotary valve as described in claim 1, characterized in that: The feed inlet of the housing corresponds to one of the two sides of the impeller rotation direction. One side is in the direction of impeller rotation and has a guide plate. The upper end of the guide plate is adjustablely connected to the feed inlet of the housing and the lower end is inclined to the upper end face of the scraping part of the scraper. The other side is away from the impeller rotation direction and has a discharge ramp. The discharge ramp is fixed to the feed inlet of the housing.

5. The self-cleaning rotary valve as described in claim 4, characterized in that: The guide plate includes a vertical section and an integrally formed inclined section at the lower end of the vertical section. The vertical section has several vertical elongated oval holes, the length of which is along the height of the box. A vertical positioning hole is provided at the feed inlet of the box for each vertical elongated oval hole. The vertical section is adjustablely connected to the feed inlet in the vertical direction by connecting bolt assemblies between the vertical elongated oval holes and the vertical positioning holes. The inclined section points obliquely downwards towards the scraping part of the scraper.

6. The self-cleaning rotary valve as described in claim 4, characterized in that: The housing has cleaning ports on the sides corresponding to the inlet and outlet, and each cleaning port is detachably connected to a cleaning port cover. The cleaning ports are opened in the direction that faces the impeller rotation direction.

7. The self-cleaning rotary valve as described in claim 6, characterized in that: A handle is fixed to the cleaning port cover.

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