A pneumatic micro dosing valve

Abstract

The present invention relates to a pneumatic micro dosing valve, which comprises a driving cylinder. On one side of the driving cylinder, there is a first valve seat coaxial with the cylinder rod and a second valve seat located outside the first valve seat. The first valve seat is provided with a feed flow channel communicating with a first through hole of the first valve seat and a discharge flow channel in an L-shaped structure. A valve rod with a valve core at one end placed in the feed flow channel is arranged in the first through hole. There is a gap between the valve rod and the first through hole. The other end of the valve rod passes through a second through hole of the second valve seat and is provided with a gland. A spring sleeved outside the valve rod is arranged between the gland and the second valve seat. The split-type driving cylinder is adopted for pneumatic control. Cooperating with the spring, it supports the valve rod to tighten the valve core to seal or conduct the flow channel. The structure is compact, the occupied size is micro, the flow channel structure is simple and easy to manufacture, the assembly, disassembly and replacement are simple and convenient, and the valve position opening and closing are fast and sensitive, improving the dosing accuracy, so as to meet the requirements of the dosing system, especially the fixed or mobile dosing production or R & D line of multiple raw material workstations.

Description

Technical Field

[0001] The present invention relates to a pneumatic micro dosing valve, belonging to the technical field of dosing valves. Background Art

[0002] Sugar flavorings are important additives in cigarette products, which have an important impact on covering up the bad smell of tobacco itself, improving the smoking taste of cigarettes, stabilizing the quality of cigarettes, and establishing the style of cigarettes. In the production or research and development process of tobacco flavorings, dosing metering is involved to precisely control the material composition ratio of sugar flavorings. However, when manually performing the proportioning formula operation, the labor intensity is high, the efficiency is low, and human proportioning formulas are prone to errors. Therefore, the function of the dosing valve to control the flow rates of sugar and spice raw materials directly affects the quality of the sugar flavoring finished product.

[0003] The pneumatic on-off valves in the prior art use electrical switch signals as control signals. After being converted into pneumatic signals by solenoid valves, a certain pressure is formed by the air in the cylinder to push the piston and slider to change the valve position of the valve body. It has the characteristics of relatively fast switching speed during control and is suitable for automated mechanical production equipment. The cut-off structures include gate valves, butterfly valves, etc., and there are defects such as large occupied dimensions of the structure, insufficiently fast and sensitive on-off cut-off of the valve position affecting dosing accuracy, complex flow channel structures of the valve body or valve seat, and difficulties in assembly, disassembly, and replacement. At the same time, the built-in integrated cylinder drive structure is difficult to achieve mobile dosing, resulting in difficulty in meeting the requirements of dosing systems, especially dosing production or research and development lines with multiple raw material workstations. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies of the prior art and provide a pneumatic micro dosing valve that uses a split drive cylinder for pneumatic control. In cooperation with a spring, it supports the valve stem to tighten the valve core to seal or conduct the flow channel. It has a compact structure, a micro occupied dimension, a simple and easy-to-fabricate flow channel structure, simple and convenient assembly, disassembly, and replacement, and fast and sensitive on-off of the valve position to improve dosing accuracy, thereby meeting the requirements of dosing systems, especially fixed or mobile dosing production or research and development lines with multiple raw material workstations.

[0005] The present invention is realized through the following technical solutions:

[0006] A pneumatic micro dosing valve includes a drive cylinder. Among them, a first valve seat coaxial with the cylinder rod and a second valve seat located outside the first valve seat are provided on one side of the drive cylinder. A first through hole and a second through hole are respectively provided coaxially in the first valve seat and the second valve seat. An inlet flow channel communicating with both sides of the first through hole and an outlet flow channel with an L-shaped cross-section are provided on the first valve seat;

[0007] One side of the first valve seat is provided with a first groove, the second valve seat is placed in the first groove, one side of the second valve seat is provided with a sealing plate located in the first groove, at least one limiting groove is provided on the inner wall of the first groove, and limiting blocks matching the shape of the limiting groove are provided on the outer walls of the first valve seat and the sealing plate. The sealing plate is provided with a third through hole and a fourth through hole that are coaxially communicated with the feed channel and the discharge channel respectively;

[0008] The sealing plate is provided with a first sealing groove, and a first sealing ring is provided between the first sealing groove and the first valve seat. One side of the second valve seat and the driving cylinder are respectively provided with parallel first mounting plates and second mounting plates. Second sealing grooves are provided on the same side of the second valve seat and the sealing plate, and second sealing rings are provided between the second sealing grooves and the first mounting plates. The first mounting plate is provided with a feed pipe and an L-shaped discharge pipe that are respectively communicated with the third through hole and the fourth through hole;

[0009] A valve rod with a valve core at one end placed in the feed channel is provided in the first through hole. A gap is provided between the valve rod and the first through hole. The other end of the valve rod passes through the second through hole and is provided with a gland. A spring sleeved outside the valve rod is provided between the gland and the second valve seat;

[0010] The valve core and the valve rod are in a T-shaped cross-sectional structure. A third sealing ring sleeved outside the valve rod is provided between the valve core and the first valve seat. A third sealing groove and a second groove coaxial with the second through hole are provided in the second valve seat. A fourth sealing ring and a bushing sleeved outside the valve rod are respectively provided in the third sealing groove and the second groove;

[0011] The second valve seat is provided with a third groove outside the spring. The gland has a T-shaped cross-section with the end located inside the inner diameter of the third groove. A set screw is provided between the gland and the valve rod. One side of the discharge channel is located on the end face of the first valve seat. A side channel communicated with one side of the discharge channel is provided in the second valve seat.

[0012] The beneficial effects of the present invention are as follows:

[0013] (1) The first valve seat and the sealing plate inside the second valve seat are positioned and installed under the matching of the shape of the limiting block and the limiting groove of the first groove, so that the valve rod is supported and tightened under the pre-pressure of the spring, and leakage is prevented under the action of each sealing ring, realizing the sealing cut-off between the valve core and the first through hole. The structure is compact, the occupied size is miniature, the flow channel structure is simple and easy to manufacture, and the assembly, disassembly and replacement are simple and convenient;

[0014] (2) A split-type driving cylinder is used to pneumatically control the opening and closing of the valve. The cylinder rod of the driving cylinder is extended to push the pressure cover compression spring. The driving valve stem moves linearly along the second through hole under the coaxial support of the bushing. The valve core is separated from the sealing surface to reduce the impact of the fluid. The feed flow channel and the discharge flow channel are connected to stabilize the batching. The cylinder rod of the driving cylinder is retracted and quickly and automatically sealed and shut off. The valve position is quickly and sensitively opened and closed to improve the batching accuracy, thereby meeting the batching system, especially the fixed or mobile batching production or R&D line requirements of multiple raw material stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a closed state structural diagram of the present invention.

[0016] Figure 2 This is the opening state structure diagram of the present invention.

[0017] Figure 3 for Figure 2 A magnified structure diagram of part A.

[0018] Markings in the figure: driving cylinder 1, cylinder rod 2, first valve seat 3, second valve seat 4, first through hole 5 and second through hole 6, feed channel 7, discharge channel 8, first groove 9, sealing plate 10, limit groove 11, limit block 12, third through hole 13 and fourth through hole 14, first sealing groove 15, first sealing ring 16, second sealing groove 17, second sealing ring 18, feed pipe 19, L-shaped discharge pipe 20, valve core 21, valve stem 22, gap 23, pressure cover 24, spring 25, third sealing groove 26 and second groove 27, third sealing ring 28, fourth sealing ring 29 and bushing 30, third groove 31, set screw 32, side channel 33, first mounting plate 34 and second mounting plate 35. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] A pneumatic micro-dosing valve, comprising a driving cylinder 1, wherein a first valve seat 3 coaxial with a cylinder rod 2 and a second valve seat 4 located outside the first valve seat 3 are provided on one side of the driving cylinder 1, a first through hole 5 and a second through hole 6 coaxially disposed in the first valve seat 3 and the second valve seat 4, respectively, a feed flow channel 7 communicating with both sides of the first through hole 5 and a discharge flow channel 8 having an L-shaped cross section are provided on the first valve seat 3;

[0021] On one side of the first valve seat 3, there is a first groove 9. The second valve seat 4 is placed within the first groove 9. On one side of the second valve seat 4, there is a sealing plate 10 located within the first groove 9. On the inner wall of the first groove 9, there are at least one limiting groove 11. On the outer walls of the first valve seat 3 and the sealing plate 10, there are limiting blocks 12 that are in shape fit with the limiting groove 11. On the sealing plate 10, there are a third through-hole 13 and a fourth through-hole 14 that are coaxially connected to the feed flow channel 7 and the discharge flow channel 8 respectively;

[0022] On the sealing plate 10, there is a first sealing groove 15. Between the first sealing groove 15 and the first valve seat 3, there is a first sealing ring 16. On one side of the second valve seat 4 and the driving cylinder 1, there are respectively parallel first mounting plates 34 and second mounting plates 35. On the same side of the second valve seat 4 and the sealing plate 10, there is a second sealing groove 17. Between the second sealing groove 17 and the first mounting plate 34, there is a second sealing ring 18. On the first mounting plate 34, there are a feed pipe 19 and an L-shaped discharge pipe 20 that are respectively connected to the third through-hole 13 and the fourth through-hole 14;

[0023] Within the first through-hole 5, there is a valve rod 22 with one end placed in the feed flow channel 7 and a valve core 21. Between the valve rod 22 and the first through-hole 5, there is a gap 23. The other end of the valve rod 22 passes through the second through-hole 6 and is provided with a gland 24. Between the gland 24 and the second valve seat 4, there is a spring 25 sleeved outside the valve rod 22;

[0024] The cross-section of the valve core 21 and the valve rod 22 is in a T-shaped structure. Between the valve core 21 and the first valve seat 3, there is a third sealing ring 28 sleeved outside the valve rod 22. Within the second valve seat 4, there are a third sealing groove 26 and a second groove 27 that are coaxial with the second through-hole 6. Within the third sealing groove 26 and the second groove 27, there are respectively a fourth sealing ring 29 and a bushing 30 sleeved outside the valve rod 22;

[0025] On the second valve seat 4, there is a third groove 31 located outside the spring 25. The cross-section of the gland 24 is in a T-shaped structure with the end located within the inner diameter of the third groove 31. Between the gland 24 and the valve rod 22, there is a set screw 32. One side of the discharge flow channel 8 is located at the end face of the first valve seat 3. Within the second valve seat 4, there is a side flow channel 33 connected to one side of the discharge flow channel 8.

[0026] The working principle of the present invention is:

[0027] During assembly, the third sealing ring 28 is fixed on the valve stem 22 on one side of the valve core 21, and is sleeved in the first through hole 5, so that the valve core 21 is located in the feed flow channel 7, and the fourth sealing ring 29 is arranged in the third sealing groove 26, and the first valve seat 3 and the valve stem 22 are integrally sleeved in the first groove 9 of the second valve seat 4, and the limiting block 12 of the first valve seat 3 is tightly inserted with the limiting groove 11 in the first groove 9 to prevent the first valve seat 3 from deflecting, and the first sealing ring 16 is arranged in the first sealing groove 15, and is coaxially sleeved into the first groove 9 in the same way, and the limiting block 12 of the sealing plate 10 is matched with the limiting groove 11 of the first groove 9, and the sealing plate 10 is positioned and installed, so that the third through hole 13 and the fourth through hole 14 are respectively connected with the feed flow channel 7 and the discharge flow channel 8;

[0028] A second sealing ring 18 is arranged in the second sealing groove 17, and the second valve seat 4 and the first mounting plate 34 are fixedly installed by riveting, bolting, welding or other mechanical connection methods, so as to realize the closed installation of the first valve seat 3 and the sealing plate 10 in the second valve seat 4, and a bushing 30 is inserted into the second groove 27 to ensure the coaxial stability of the balanced support when there is a gap 23 between the valve stem 22 and the first through hole 5, and the spring 25 outside the valve stem 22 is inserted into the third groove 31, and the pressure cover 24 is inserted to compress the spring 25, and the pressure cover 24 and the valve stem 22 are fixedly connected by the tightening screw passing through the pressure cover 24 and the valve stem 22, and the driving cylinder 1 is installed on the second mounting plate 35 and electrically connected to realize the overall assembly, which has a compact structure, reduces the space occupied by the valve, is reliable to assemble, and is convenient to disassemble and replace;

[0029] See attached Figure 1 , connect the feed pipe 19 to the tobacco sugar or flavor raw material delivery pipeline, support the valve stem 22 to be tightened under the pre-pressure of the spring 25, the cross-section of the valve core 21 and the valve stem 22 is T-shaped, and the third sealing ring 28 is used to assist in the sealing and cut-off of the valve core 21 and the first through hole 5. At this time, the feed flow channel 7 and the discharge flow channel 8 are not connected, the valve is closed, and the batching is cut off;

[0030] See attached Figure 2, the second mounting plate 35 can be fixedly installed parallel to the first mounting plate 34 or can be movable for batching. In the movable batching, when the driving cylinder 1 moves relatively to the coaxial corresponding side of the second valve seat 4, the cylinder rod 2 of the driving cylinder 1 extends, pushes the pressure cover 24 to compress the spring 25, and drives the valve stem 22 to move linearly along the second through hole 6, so that the third sealing ring 28 of the valve core 21 is separated from the sealing surface of the first valve seat 3 on the side of the first through hole 5. At this time, the feed flow channel 7 and the discharge flow channel 8 are connected, and the tobacco raw material liquid is discharged from the feed pipe 19, through the third through hole 13, the feed flow channel 7, the gap 23 between the first through hole 5 and the valve stem 22, the L-shaped discharge flow channel 8 and the side flow channel 33, and the fourth through hole 14, and from the L-shaped discharge pipe 20. At this time, the valve is opened for batching, and the flux of the gap 23 between the first through hole 5 and the valve stem 22 is small, which is convenient for fast and accurate control of the batching amount when it is turned on and off;

[0031] During the batching process, the first sealing ring 16 improves the sealing performance between the sealing plate 10 and the first valve seat 3, the second sealing ring 18 improves the sealing performance between the sealing plate 10 and the second valve seat 4 and the first mounting plate 34, and the fourth sealing ring 29 improves the sealing performance between the valve stem 22 and the second valve seat 4, so that the sealing is reliable, the installation is convenient, and the leakage is prevented;

[0032] The ends of the first through hole 5, the second through hole 6, the third through hole 13, the fourth through hole 14, the feed channel 7, and the discharge channel 8 can also be provided with groove buffer fluid, and the feed channel 7 with an inner diameter larger than the inner diameter of the third through hole 13 is used, and the fluid impact is mitigated by the valve core 21 to ensure stable batching. One side of the discharge channel 8 is located at the end face of the first valve seat 3 and cooperates with the side channel 33 to avoid a complex channel structure, facilitate the manufacture of the discharge channel 8 of the first valve seat 3, and avoid the inner diameter of the channel affecting the fluid flow rate, reduce the manufacturing cost and difficulty, and ensure stable batching. By setting the third groove 31, not only the valve size is reduced, but also the cross-section of the pressure cover 24 is a T-shaped structure with the end located within the inner diameter of the third groove 31. During the driving movement, the pressure cover 24 moves and limits along the inner diameter of the third groove 31 to ensure reliable execution of stable batching.

[0033] When the cylinder rod 2 of the driving cylinder 1 contracts, the valve stem 22 is tightened again under the elastic restoring force of the compression spring 25, so that the valve core 21 moves toward the first through hole 5, until the cylinder rod 2 is separated from the gland 24, and the valve core 21 is closed again and returns to the adjacent Figure 1 The closed state, batching is completed at one time, the action is fast and sensitive, and the measurement is reliable;

[0034] In summary, the present invention adopts a split-type driving cylinder 1 to pneumatically control the opening and closing of the valve, which has a compact structure and a miniature size, the valve position is quickly and sensitively turned on and off, which improves the accuracy of batching, and the sealing is reliable. The first valve seat 3, the second valve seat 4, the sealing plate 10 and other structural flow channel structures are simple and easy to manufacture, and the assembly, disassembly and replacement are simple and convenient, thereby meeting the batching system, especially the fixed or mobile batching production or R&D line needs of multiple raw material stations.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0036] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0037] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A pneumatic micro dosing valve, comprising a driving cylinder, characterized in that, On one side of the driving cylinder, there is a first valve seat coaxial with the cylinder rod and a second valve seat located outside the first valve seat. A coaxial first through hole and a second through hole are respectively provided in the first valve seat and the second valve seat. An inlet flow channel communicating with both sides of the first through hole and an outlet flow channel with an L-shaped cross-section are provided on the first valve seat. A valve rod with a valve core at one end placed in the inlet flow channel is provided in the first through hole. There is a gap between the valve rod and the first through hole. The other end of the valve rod passes through the second through hole and is provided with a gland. A spring sleeved on the outside of the valve rod is provided between the gland and the second valve seat. A first groove is provided on one side of the second valve seat. The first valve seat is placed in the first groove. A sealing plate located in the first groove is provided on one side of the first valve seat. A third through hole and a fourth through hole respectively communicating with the inlet flow channel and the outlet flow channel coaxially are provided on the sealing plate. At least one limiting groove is provided on the inner wall of the first groove. Limiting blocks matching the shape of the limiting groove are provided on the outer walls of the first valve seat and the sealing plate. A first sealing groove is provided on the sealing plate. A first sealing ring is provided between the first sealing groove and the first valve seat. Parallel first mounting plates and second mounting plates are respectively provided on one side of the second valve seat and the driving cylinder. Second sealing grooves are provided on the same side of the second valve seat and the sealing plate. Second sealing rings are provided between the second sealing grooves and the first mounting plates.

2. The pneumatic micro batching valve according to claim 1, wherein An inlet pipe and an L-shaped outlet pipe respectively communicating with the third through hole and the fourth through hole are provided on the first mounting plate.

3. The pneumatic micro batching valve according to claim 1, characterized in that, The valve core and the valve rod have a T-shaped cross-section. A third sealing ring sleeved on the outside of the valve rod is provided between the valve core and the first valve seat.

4. The pneumatic micro dosing valve according to claim 1, characterized in that, A third sealing groove and a second groove coaxial with the second through hole are provided in the second valve seat. A fourth sealing ring and a bushing sleeved on the outside of the valve rod are respectively provided in the third sealing groove and the second groove.

5. The pneumatic micro batching valve according to claim 1, characterized in that A third groove located outside the spring is provided on the second valve seat. The gland has a T-shaped cross-section with the end located inside the inner diameter of the third groove. A set screw is provided between the gland and the valve rod.

6. A pneumatic micro batching valve according to any one of claims 1 to 5, characterized in that One side of the outlet flow channel is located on the end face of the first valve seat. A side flow channel communicating with one side of the outlet flow channel is provided in the second valve seat.

Images