A three-way valve for conveying powders and granules

Abstract

The present invention describes a three-way valve for conveying powders and granules. The housing includes an inlet and two outlets. A power assembly is provided at the upper part of the housing. Two sets of transmission assemblies corresponding up and down are embedded in the housing. Rotating valve cores are arranged in both sets of transmission assemblies, and a sealing assembly is provided between the rotating valve cores and the transmission assemblies. The three-way valve of the present invention is used in an obtuse-angled hypotenuse pipeline and will not clog during straight and oblique conveying. At the same time, the interior of the three-way valve is an air cavity, and there is no central shaft obstruction inside the rotating channel, so problems such as fragmentation of powders and granules caused by impact will not occur.

Description

Technical Field

[0001] The present invention relates to the technical field of valve bodies, and particularly to a three-way valve for conveying powders and particles, especially a three-way valve provided for material conveying. Background Art

[0002] Currently, in the powder conveying process of the filling industry, straight pipe conveying is generally preferred first. When encountering a 90° conveying angle, the deflection radius of the pipeline will be made very large, generally requiring a size greater than 5 times the diameter of the pipeline itself. Because too small a deflection radius will cause materials to accumulate at the 90° elbow, resulting in conveying blockage. And all the 90° three-way valves on the market have a small deflection radius, so the 90° three-way valve cannot be used for powder conveying, which brings inconvenience to the conveying and filling of powders. Due to the settings of the production line and the filling machine, it is inevitable to carry out corner transportation during the powder conveying process.

[0003] The current three-way valves on the market are all of a 90° vertical structure, that is, the inlet and the two outlets form a 90° angle, and the conveying pipeline is switched by rotating the middle rotating shaft; very few are of an obtuse angle structure, that is, the inlet is parallel to one of the outlets and forms an obtuse angle with the other outlet, and a rotatable baffle is used to cover one of the outlets. The existing three-ways are basically used for liquid or gas conveying, but the accuracy of this structure is difficult to control, and it is very easy to cause powder leakage or air leakage.

[0004] If an obtuse angle three-way valve is used for corner transportation, the obtuse angle three-way valve has a central axis and a conveying cavity in its structure. During the conveying process to the hypotenuse pipeline, some materials will hit the central axis, easily causing the powder or particles to break, reducing the material quality and product quality; and the cavity of the obtuse angle three-way valve will accumulate some materials, resulting in problems such as incomplete conveying and deterioration of the accumulated materials.

[0005] Therefore, there is an urgent need in the market for a three-way valve that can solve the three-way commutation problem during powder conveying and avoid particle breakage at the same time. Summary of the Invention

[0006] The purpose of the present invention is to provide a three-way valve for conveying powders and particles. By completely changing the structure of the three-way valve, a power assembly, a transmission assembly and a rotating valve core that cooperate with the power assembly are provided, so that the material conveying performance of the three-way valve is improved and no material blocking phenomenon will occur.

[0007] A three-way valve for conveying powders and particles, the three-way valve comprising a housing, characterized in that: the housing includes an inlet and two outlets, a power assembly is provided on the upper part of the housing, two sets of transmission assemblies corresponding up and down are embedded in the housing, a rotating valve core is arranged in each of the two sets of transmission assemblies, and a sealing assembly is arranged between the rotating valve core and the transmission assembly.

[0008] Preferably, the two transmission components are respectively an upper transmission component and a lower transmission component. The upper and lower ends of the upper transmission component are respectively provided with a first upper flange and a first lower flange. A cavity penetrating through the upper and lower ends is provided in the middle of the upper transmission component. The cavity is formed by splicing a large cylinder and a small cylinder. The cavity of the small cylinder is connected to the upper flange, and the cavity of the large cylinder is connected to the lower flange through a retaining ring. A bearing is arranged in the cavity of the large cylinder to limit the concentricity and circular runout of the valve core central axis. A plurality of first air vents are provided at the upper end of the first lower flange;

[0009] The upper and lower ends of the lower transmission component are respectively provided with a second upper flange and a second lower flange. A cavity penetrating through the upper and lower ends is provided in the middle of the lower transmission component. The cavity is formed by connecting a breathable cavity and a bearing cavity. Second air vents are provided around the breathable cavity to balance the air pressure inside and outside the cavity. A bearing is arranged in the bearing cavity to limit the concentricity and circular runout of the valve core central axis. A bearing cover is provided at the bottom of the second lower flange.

[0010] Furthermore, the rotary valve core includes a valve core body. A conveying channel penetrating through the valve core body is provided in the middle of the valve core body. A set of symmetrically arranged double-layer eccentric holes are provided on the side of the valve core body. The double-layer eccentric holes cooperate with the shell. The inner hole of the double-layer eccentric holes is communicated with the conveying channel, and a sealing component is arranged in the outer hole. The upper and lower parts of the valve core body are respectively connected with symmetrically arranged upper and lower rotating shafts; a square key is provided at the end of the upper rotating shaft for connecting with the power component. A central hole penetrating through the lower rotating shaft is provided in the lower rotating shaft. A vent hole is provided in the outer hole of the double-layer eccentric holes, and the outer hole is communicated with the central hole through the vent hole.

[0011] Furthermore, one inlet and two outlets of the shell are interconnected with each other. During operation, only one of the outlets can be selected to be connected to the inlet. One of the outlets is eccentrically connected to the inlet, and there is an included angle between the other outlet and the inlet.

[0012] Furthermore, upper and lower covers are respectively provided on the upper and lower parts of the shell. Outer grooves are respectively provided at the centers of the upper and lower covers; the inside of the shell is a cylindrical cavity, and the cylindrical cavity is respectively communicated with one inlet and two outlets. Upper and lower cylindrical grooves communicated with the cylindrical cavity of the shell are respectively provided at the upper and lower ends of the cylindrical cavity of the shell. The upper and lower cylindrical grooves are respectively connected with the upper and lower covers, and upper and lower sliding blocks are respectively arranged between the upper and lower cylindrical grooves and the cylindrical cavity of the shell; evenly distributed slot holes are provided on the upper and lower covers.

[0013] Even further, the bottom of the second upper flange of the lower transmission component is an inclined surface protruding upward, and the air vents are arranged along the outer circumference of the inclined surface.

[0014] Compared with the prior art, the technical solution of the present invention includes improvements not only in the overall technical solution but also in many details. Specifically, it has the following beneficial effects:

[0015] 1. In the improvement scheme of the present invention, a power component is provided at the upper part of the three-way valve housing. Two sets of transmission components corresponding up and down are embedded in the housing. A rotary valve core is arranged in each of the two sets of transmission components, and a sealing component is arranged between the rotary valve core and the transmission component. When in use, the three-way valve of the present invention is used in an obtuse-angled hypotenuse pipeline and will not block materials during straight and oblique conveying. At the same time, the inside of the three-way valve is an air cavity, and there is no central axis obstruction inside the rotary channel, so problems such as powder and particles being broken due to impact will not occur;

[0016] 2. In the technical solution of the present invention, one inlet and two outlets of the housing are interconnected with each other. Among them, one outlet is eccentrically connected to the inlet, and there is an included angle between the other outlet and the inlet. This eccentric design results in an eccentric rotary channel without a conveying cavity, and no materials will accumulate at the end of the conveying;

[0017] 3. The structure of the present invention is reasonably designed and can be installed and used in the forward or reverse direction. When installed and used in the reverse direction, the obliquely discharging port that deflects to the right can be changed to deflect to the left, with a wider applicability and being conducive to popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structural schematic diagram of the present invention.

[0019] Figure 2 is a structural schematic diagram of an embodiment of the present invention.

[0020] Figure 3 is a structural schematic diagram of the power component of the present invention.

[0021] Figure 4 is a three-dimensional structural schematic diagram of the upper transmission component of the present invention.

[0022] Figure 5 is a cross-sectional view of the upper transmission component of the present invention.

[0023] Figure 6 is a top view of the upper transmission component of the present invention.

[0024] Figure 7 is a three-dimensional structural schematic diagram of the lower transmission component of the present invention.

[0025] Figure 8 is another three-dimensional structural schematic diagram of the lower transmission component of the present invention.

[0026] Figure 9It is a cross-sectional view of the lower transmission assembly described in the present invention.

[0027] Figure 10 It is a schematic diagram of the three-dimensional structure of the housing described in the present invention.

[0028] Figure 11 It is a top view of the housing described in the present invention.

[0029] Figure 12 It is a cross-sectional view of the housing described in the present invention.

[0030] Figure 13 It is a schematic diagram of the structure of the rotary valve core described in the present invention.

[0031] Figure 14 It is a cross-sectional view of the rotary valve core described in the present invention.

[0032] Figure 15 It is a partially enlarged cross-sectional view of the rotary valve core described in the present invention.

[0033] Figure 16 It is a schematic diagram of the structure of the polytetrafluoroethylene sealing sleeve described in the present invention.

[0034] Figure 17 is Figure 16 cross-sectional view of.

[0035] Figure 18 It is a schematic diagram of the original state structure of the valve core when the present invention is in use.

[0036] Figure 19 It is a schematic diagram of the structure for switching pipelines after the valve core rotates counterclockwise by 150 degrees when the present invention is in use.

[0037] Reference numerals:

[0038] 1 housing, 11 inlet, 12 outlet;

[0039] 2 power assembly, 3 upper transmission assembly, 4 lower transmission assembly, 5 rotary valve core, 6 sealing assembly;

[0040] 21 flange docking hole, 22 output hole;

[0041] 31 first upper flange, 32 first lower flange, 33 large cylindrical cavity, 34 small cylindrical cavity, 35 bearing, 36 first ventilation hole, 37 semi-circular groove, 38 circular through-hole;

[0042] 41 second upper flange, 42 second lower flange, 43 ventilation cavity, 44 bearing cavity, 45 inclined surface, 46 second ventilation hole, 47 bearing cover;

[0043] 11 Upper cover plate, 12 lower cover plate, 13 outer groove, 14 upper cylindrical groove, 15 lower cylindrical groove, 16 upper slider, 17 lower slider, 18 slot hole, 19 inner groove;

[0044] 51 Spool body, 52 conveying channel, 53 double-layer eccentric hole, 54 upper rotating shaft, 55 square key, 56 lower rotating shaft, 57 threaded through hole, 58 vent hole;

[0045] 61 Polytetrafluoroethylene sealing sleeve, 62 arc-shaped cut surface. Specific embodiments

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0048] The present invention provides a three-way valve for conveying powders and particles. Refer to Figure 1 In the figure, the three-way valve includes a housing, and the difference from the prior art is that: the housing includes an inlet and two outlets, a power assembly is provided on the upper part of the housing, two sets of transmission assemblies corresponding up and down are embedded in the housing, a rotating spool is arranged in each of the two sets of transmission assemblies, and a sealing assembly is arranged between the rotating spool and the transmission assembly. For the described one inlet and two outlets, during operation, the inlet can only be connected to one of the outlets, and there is an eccentric connection between one of the outlets and the inlet. Here, the eccentric connection means that there is an eccentric distance A between the center line of the outlet and the center line of the inlet, and this eccentric distance is 1 / 4 - 1 / 3 of the inlet diameter. There is an included angle between the other outlet and the inlet, that is, there is an included angle θ between the center line of the other outlet and the center line of the inlet, and the range of the included angle θ is 120 - 165 degrees, preferably 160 degrees.

[0049] Specifically, refer to Figures 10 - 12, upper and lower cover plates are respectively provided on the upper and lower parts of the housing, and outer grooves are respectively provided at the centers of the upper and lower cover plates; the inside of the housing is a cylindrical cavity, and the cylindrical cavity is respectively communicated with an inlet and two outlets. Upper and lower cylindrical grooves communicated therewith are respectively provided at the upper and lower ends of the cylindrical cavity of the housing, and the upper and lower cylindrical grooves are respectively connected with the outer grooves of the upper and lower cover plates. Upper and lower sliding blocks are respectively arranged between the upper and lower cylindrical grooves and the cylindrical cavity of the housing; uniformly distributed slot holes are provided on the upper and lower cover plates.

[0050] During installation, the upper and lower cover plates are two detachable flat plates, and sealing rings are installed at the parts that cooperate with the inner surface of the outer shell for sealing the housing during installation. Outer grooves and inner grooves are respectively provided at the centers of the inner and outer surfaces of the upper and lower cover plates. The inner groove on the inner surface is embedded with a processed polytetrafluoroethylene slider for supporting the rotation of the central shaft of the valve core, and the outer groove on the outer surface is used for concentricity positioning when installing the transmission assembly. During installation, the outer shell can be turned over and installed according to actual needs, so that the θ angle deflected to the right can be changed to deflect to the left, which is convenient and flexible for different installation position change requirements.

[0051] In one embodiment, two sets of upper and lower corresponding transmission assemblies are embedded in the housing. The two sets of transmission assemblies are respectively an upper transmission assembly and a lower transmission assembly. First upper and first lower flanges are respectively provided at the upper and lower ends of the upper transmission assembly (see Figure 5 ), a cavity penetrating through the upper and lower ends is provided in the middle of the upper transmission assembly, and the cavity is composed of two spliced cylindrical cavities of different sizes. The small cylindrical cavity is connected to the upper flange, and the large cylindrical cavity is connected to the lower flange through a retaining ring. A bearing is arranged in the large cylindrical cavity for restricting the concentricity and circular runout of the central shaft of the valve core. A plurality of first air vents are provided at the upper end of the first lower flange.

[0052] Specifically, see Figures 4 - 6, the first upper flange is connected to the valve actuator, and the first lower flange is connected to the upper cover plate of the housing. The first upper flange is in a circular ring shape, and evenly distributed semi-circular grooves are provided at the outer circular edge of the first upper flange. The diameter of the first lower flange is larger than that of the upper flange, and the first lower flange is also in a circular ring shape. Circular through holes are evenly distributed on the circular ring of the first lower flange; several ventilation holes are provided at the upper end of the first lower flange (i.e., the connection part with the upper transmission component body) to balance the air pressure inside and outside the cavity. The position where the first ventilation holes are provided corresponds to the position of the semi-circular grooves of the first upper flange. The ventilation holes are inclined, that is, there is an angle of 30 - 45 degrees between the center line of the first ventilation holes and the upper surface of the first lower flange, so that the aperture is small while the ventilation effect is good. The middle cavity of the upper transmission component includes two cylindrical cavities of different sizes, and the volume ratio of the two cavities is 1:3 - 5.6, and the preferred volume ratio is 1:3.8, which can achieve the best performance effect. A bearing is provided in the large cylindrical cavity to limit the concentricity and circular runout of the valve core central axis, and a retaining ring is used to fix the bearing.

[0053] The upper and lower ends of the lower transmission component are respectively provided with a second upper flange and a second lower flange. The diameter of the second upper flange is larger than that of the second lower flange. A cavity penetrating through the upper and lower ends is provided in the middle of the lower transmission component. The cavity is formed by connecting a ventilation cavity and a bearing cavity. Both the ventilation cavity and the bearing cavity are cylindrical, and the ventilation cavity and the bearing cavity are concentrically arranged. The volume ratio between the ventilation cavity and the bearing cavity is 1:3 - 8. The top of the ventilation cavity is connected to the inner wall of the lower transmission component through an annular surface. The annular surface is an inclined surface protruding upward in the center. The second ventilation holes are arranged along the outer circumference of the inclined surface. The angle between the annular surface and the inner wall of the lower transmission component is 70 - 85 degrees to ensure the air pressure balance effect. Second ventilation holes are provided around the ventilation cavity to balance the air pressure inside and outside the cavity. A bearing is provided in the bearing cavity to limit the concentricity and circular runout of the valve core central axis, and a bearing cover is provided at the bottom of the second lower flange.

[0054] In another embodiment, refer to Figure 13 , 14 , the rotating valve core includes a valve core body. A conveying channel penetrating through the valve core body is provided in the middle of the valve core body. A set of symmetrically arranged double-layer eccentric holes are provided on the side of the valve core body. The double-layer eccentric holes cooperate with the housing. The inner holes of the double-layer eccentric holes are communicated with the conveying channel, and a sealing component is arranged in the outer holes. Symmetrically arranged upper and lower rotating shafts are respectively connected to the upper and lower parts of the valve core body; a square key is provided at the end of the upper rotating shaft for connection with the power component. A central hole penetrating through the lower rotating shaft is provided in the lower rotating shaft. Ventilation holes are provided in the outer holes of the double-layer eccentric holes, and the outer holes are communicated with the central hole through the ventilation holes.

[0055] Specifically, the rotating valve core is a solid cylinder with concentric rotating shafts welded on both the upper and lower ends, and there is a double-layer eccentric hole on the side wall of the cylinder. The size of the eccentricity of the eccentric hole from the center is the same as the eccentric distance A of the straight-through pipe of the shell outer casing. Refer to Figure 15 , the inner hole diameter is the same as the inner diameter of the pipe of the shell and is used for conveying materials; the annular outer hole is used for installing the sealing component, and there is a vent hole at the bottom, which is communicated with the central hole of the lower rotating shaft; the end of the upper rotating shaft is a standard square key structure and is used for docking with the output hole of the actuator of the power component; there is a threaded through hole at the end of the lower rotating shaft and is used for installing a compressed air nozzle joint.

[0056] During installation, the upper and lower surfaces of the valve core cylinder are limited by the upper and lower sliders inside the shell to prevent the valve core from jumping up and down; the upper and lower rotating shafts are restricted by the bearings of the upper and lower transmission components for concentricity and circular runout to prevent eccentric swing when the valve core rotates.

[0057] The sealing component described in the present invention is composed of a special-shaped polytetrafluoroethylene sealing sleeve and a standard O-ring, and is installed on the valve core rotating shaft and the eccentric hole to seal the conveying channel when conveying materials to prevent materials from leaking from the rotating shaft connection.

[0058] The polytetrafluoroethylene sealing sleeve is in a hollow cylindrical shape, and its top is provided with an arc-shaped cut surface. One end of this cut surface is higher than the other end, and the height difference between one side and the other side is 1 / 3 - 1 / 2 of the diameter of the cylinder, and the preferred value is 5 / 12, which can achieve the best sealing effect.

[0059] In a specific embodiment, before conveying materials, first input compressed air into the vent hole through the air nozzle at the bottom of the valve core to push out the sealing sleeve installed on the eccentric ring of the valve core to the inner surface of the shell for sealing, and then conduct material conveying (dense-phase conveying).

[0060] When it is necessary to switch the pipeline, refer to Figure 3 , ensure that the current is not in the conveying state. First, stop inputting compressed air through the air nozzle at the bottom of the valve core, and then the power component (actuator) rotates the valve core (about 150°) to connect to another pipeline. Finally, input compressed air again through the air nozzle at the bottom of the valve core. Power component: a pneumatic / electric valve actuator with a special deflection angle (the standard product is 90°). By using compressed air / electricity, the output hole of the actuator can output a deflection angle θ1, and the size of this angle is the same as the obtuse angle pipeline angle θ (such as 150°) of the three-way.

[0061] In use, the three-way valve of the present invention is used in an obtuse-angled bevel pipeline. When conveying straight or obliquely, it will not block the material. At the same time, the inside of the three-way valve is an air cavity, and there is no central axis obstruction inside the rotating channel, so problems such as powder and particles being broken due to impact will not occur. At the same time, one inlet and two outlets of the housing are interconnected with each other. Among them, the connection between one outlet and the inlet is eccentric, and there is an included angle between the other outlet and the inlet. This eccentric design results in an eccentric rotating channel without a conveying cavity, and there will be no accumulated materials at the end of the conveying. The outer shell can also be installed reversely, so that the obliquely discharging port deflecting to the right can be changed to deflect to the left. The included angle between the two outlets can be selected, and the diameter of the three-way valve can be selected as Φ45, Φ50.8, Φ60.3, Φ63.5 or Φ76.2.

[0062] This device can be arranged at the connection of the conveying pipelines of the powder and particle conveying line, for example, on the conveying pipeline between the sending silo and the destination silo.

[0063] The specific embodiments of the present invention have been described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions made to the present invention are also within the scope of the present invention. Therefore, all equal transformations and modifications made without departing from the spirit and scope of the present invention should be covered within the scope of the present invention.

Claims

1. A three-way valve for conveying powders and granules, the three-way valve comprising a housing, characterized in that: The housing includes an inlet and two outlets. There is an eccentric connection between one outlet and the inlet, and there is an eccentric distance between the center line of the outlet and the center line of the inlet. The eccentric distance is 1 / 4 - 1 / 3 of the inlet diameter. There is an included angle between the other outlet and the inlet, and the range of the included angle is 120 - 165 degrees. A power assembly is provided at the upper part of the housing, and two sets of transmission assemblies corresponding up and down are embedded in the housing. Rotary valve cores are arranged in both sets of transmission assemblies, and a sealing assembly is provided between the rotary valve core and the transmission assembly. The two sets of transmission assemblies are respectively an upper transmission assembly and a lower transmission assembly. The upper and lower ends of the upper transmission assembly are respectively provided with a first upper flange and a first lower flange. A cavity penetrating through the upper and lower ends is provided in the middle of the upper transmission assembly. The cavity is composed of a large and a small cylinder spliced together, namely a large cylinder cavity and a small cylinder cavity. The volume ratio of the two cavities is 1:3 - 5.

6. The small cylinder cavity is connected to the upper flange, and the large cylinder cavity is connected to the lower flange through a retaining ring. A bearing is arranged in the large cylinder cavity to limit the concentricity and circular runout of the valve core central axis. A number of first air vents are provided at the upper end of the first lower flange, and there is an included angle of 30 - 45 degrees between the center line of the first air vent and the upper surface of the first lower flange. The upper and lower ends of the lower transmission assembly are respectively provided with a second upper flange and a second lower flange. A cavity penetrating through the upper and lower ends is provided in the middle of the lower transmission assembly. The cavity is composed of a ventilation cavity and a bearing cavity connected. Both the ventilation cavity and the bearing cavity are cylindrical, and the ventilation cavity and the bearing cavity are concentrically arranged. The volume ratio between the ventilation cavity and the bearing cavity is 1:3 - 8. Second air vents are provided around the ventilation cavity to balance the air pressure inside and outside the cavity. The top of the ventilation cavity is connected to the inner wall of the lower transmission assembly through an annular surface. The annular surface is an inclined surface convex upward at the center, and the second air vents are arranged along the outer circumference of the inclined surface. The included angle between the annular surface and the inner wall of the lower transmission assembly is 70 - 85 degrees. A bearing is arranged in the bearing cavity to limit the concentricity and circular runout of the valve core central axis. A bearing cover is provided at the bottom of the second lower flange. Upper and lower covers are respectively provided at the upper and lower parts of the housing, and outer grooves are respectively provided at the centers of the upper and lower covers.

2. A three-way valve for conveying powders and granules according to claim 1, characterized in that: The rotary valve core includes a valve core body. A conveying channel penetrating through the valve core body is provided in the middle of the valve core body. A set of symmetrically arranged double-layer eccentric holes is provided on the side of the valve core body. The double-layer eccentric holes cooperate with the housing. The inner holes of the double-layer eccentric holes are connected to the conveying channel, and a sealing assembly is arranged in the outer holes. Symmetrically arranged upper and lower rotating shafts are respectively connected to the upper and lower parts of the valve core body. A square key is provided at the end of the upper rotating shaft for connection with the power assembly. A central hole penetrating through the lower rotating shaft is provided in the lower rotating shaft. Ventilation holes are provided in the outer holes of the double-layer eccentric holes, and the outer holes are connected to the central hole through the ventilation holes.

3. A three-way valve for conveying powder and particles according to claim 1, characterized in that: The inside of the housing is a cylindrical cavity, and the cylindrical cavity is respectively communicated with an inlet and two outlets. Upper and lower cylindrical grooves communicated with it are respectively provided at the upper and lower ends of the cylindrical cavity of the housing. The upper and lower cylindrical grooves are respectively connected to upper and lower covers, and upper and lower sliding blocks are respectively arranged between the upper and lower cylindrical grooves and the cylindrical cavity of the housing; The upper and lower covers are provided with uniformly distributed slot holes.

4. A three-way valve for conveying powder and particles according to claim 1, characterized in that: The bottom of the second upper flange of the lower transmission member is an inclined surface protruding upward, and the vent holes are arranged along the outer circumference of the inclined surface.

Images