Direct-current rotary plate valve for chemical production

Abstract

The utility model relates to a direct-flow rotary plate valve for chemical production, which comprises a valve body, a direct-flow channel is axially arranged on the valve body, a valve seat is fixedly arranged in the direct-flow channel, and a valve plate in seal fit with the valve seat is arranged in the valve body, and is characterized in that the valve plate is rotatably connected with the valve body through a first shaft body, and a valve rod is arranged on one surface, far away from the valve seat, of the valve plate; a guide sliding groove is formed in the side wall, away from the valve seat, of the valve plate, one end of the valve rod is rotationally and slidably connected with the guide sliding groove through a second shaft body, the second shaft body is parallel to the first shaft body, and the other end of the valve rod obliquely extends out of the valve body. The valve plate can be driven to rotate by pulling the valve rod to linearly slide, opening and closing sealing of the direct flow channel of the valve body is achieved, opening and closing of the direct flow channel by the valve plate are quicker and more direct, the lifting mode is more labor-saving and convenient to use, and the sealing performance is improved through sealing fit of the valve plate and the valve seat.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a DC rotary valve for chemical production. Background Technology

[0002] In chemical production, the existing gate valves typically have a valve plate that moves up and down. The valve plate moves up and down to open or close the medium flow channel in the valve body. This type of valve requires expansion and sealing when closed, and the friction increases when opening, making it difficult to open and easily damaging the sealing surface. Furthermore, the sealing performance between the valve plate and the medium flow channel is not high, and improvements are still needed. Utility Model Content

[0003] This invention addresses the shortcomings of existing technologies by providing a DC rotary valve for chemical production. The valve plate features a compression seal, minimizing damage to the sealing surface. A balancing structure balances the pressure before and after the valve plate, making it easy to open and ensuring safer, more reliable valve operation. It also provides superior sealing for toxic, harmful, flammable, and explosive fluids generated during chemical production.

[0004] This utility model is achieved through the following technical solution: a DC rotary valve for chemical production, comprising a valve body, a DC channel along the axial direction of the valve body, a valve seat fixed in the DC channel, a valve plate that seals with the valve seat inside the valve body, the valve plate being rotatably connected to the valve body via a first shaft, a valve stem being provided on the side of the valve plate away from the valve seat, a guide groove being provided on the side wall of the valve plate, one end of the valve stem being rotatably and slidably connected to the guide groove via a second shaft, the second shaft being parallel to the first shaft, and the other end of the valve stem extending obliquely to the outside of the valve body.

[0005] When using this solution, pulling the valve stem causes it to slide along the valve body at an angle, which in turn drives the valve plate to rotate around the first axis, thus opening or sealing the DC channel. The valve plate opens and closes the DC channel more quickly and directly, and the lifting method is more labor-saving and convenient to use.

[0006] As an optimization, the valve body is provided with a hinge hole that mates with the first shaft, and the diameter of the hinge hole is larger than the outer diameter of the first shaft. In this optimized solution, the first shaft can move axially within the hinge hole, thereby allowing the valve plate to be displaced axially. When the valve plate rotates to close, it can move towards the valve seat, thereby pressing the sealing ring on the valve seat and further improving the sealing performance.

[0007] As an optimization, a guide sleeve is fixedly connected to the outer wall of the valve body, and the valve stem extends through the guide sleeve to the outside of the valve body. A sealing ring that seals with the valve stem is fixedly provided on the inner wall of the guide sleeve. In this optimized solution, the valve stem slides along the guide sleeve, which is more stable, and the sealing ring ensures the sealing between the valve stem and the guide sleeve.

[0008] As an optimization, a vertical first connecting pipe is fixed to the outer wall of the valve body, communicating with the cavity on the side of the valve seat away from the valve plate. A horizontal second connecting pipe is fixed to the first connecting pipe, communicating with the cavity on the side of the valve seat closer to the valve plate. A gate ring is fixed inside the first connecting pipe, with the height of the gate ring lower than the height of the inner cavity of the second connecting pipe. A sliding rod that moves up and down is provided inside the first connecting pipe, and a sealing cap that seals with the gate ring is fixed to the lower end of the sliding rod. In this optimized scheme, when fluid is introduced into the direct channel, the fluid pressure is very high, making it inconvenient for the valve plate to open. At this time, by pulling up the sealing cap, the inner cavities of the first and second connecting pipes are connected, thereby connecting the cavities on both sides of the valve seat. The fluid first passes through the first and second connecting pipes, balancing the pressure on both sides, thus facilitating the opening of the valve plate.

[0009] As an optimization, two valve seats are distributed axially within the DC channel, and the valve plate is correspondingly provided on the side of each valve seat that is furthest from each other. This optimized solution achieves bidirectional sealing of the DC channel through a one-to-one sealing fit between the two valve seats and the two valve plates, thereby improving the sealing performance.

[0010] As an optimization, the valve body is equipped with a vent pipe and an exhaust pipe, both of which are connected to the cavity between the two valve seats. A switch valve is installed on both the vent pipe and the exhaust pipe. In this optimized design, when both valve plates are closed, a cavity is formed between the two valve seats. High-pressure gas is introduced into the cavity through the vent pipe, creating an airtight seal. This prevents harmful, flammable, and explosive fluids from leaking into the cavity during chemical production, thus improving the sealing effect.

[0011] As an optimization, a partition is fixedly connected inside the DC channel, dividing the DC channel into multiple sub-channels. Each sub-channel is equipped with a valve seat, and each valve seat is equipped with a corresponding valve plate. This optimized solution is suitable for large-diameter valve bodies. Large-diameter valve bodies have large medium flow rates. By setting multiple sub-channels, a portion of the flow from the DC channel is discharged, thereby facilitating the control of the flow rate of large-flow media.

[0012] As an optimization, the partition is a straight-line structure, and the DC channel is divided into two sub-channels distributed vertically by the partition. This optimized solution can divide the DC channel into two sub-channels by using a straight-line partition, each carrying a different medium.

[0013] As an optimization, hollow guide posts are provided on the outer walls of both sides of the valve body and the second shaft, opposite to each other. The inner cavity of the guide post and the direct current channel are connected through guide holes, which extend in the same direction as the guide posts. The valve plate located below is rotatably connected to the partition plate. The two ends of the second shaft connected to this valve plate extend through the guide holes into the inner cavity of the guide posts. Valve stems are fixed to both ends of the second shaft, and the two valve stems are respectively sealed and slidably connected to the two guide posts. This optimized solution, by setting guide posts on both sides of the valve body, shifts the valve stems connected to the lower valve plate into the guide posts, thereby facilitating the extension of the valve stem ends to the outside of the valve body.

[0014] As an optimization, the partition is a cross-shaped structure, dividing the DC channel into four sub-channels. This optimization scheme improves flow control by increasing the number of sub-channels and further diverting the DC flow.

[0015] As an optimization, the valve seat is hollow, and a hollow double-layer sealing ring is fixedly connected to the side of the valve seat facing the valve plate. The inner cavity of the valve seat is connected to the cavity of the double-layer sealing ring through a vent hole. An air inlet pipe connected to the inner cavity of the valve seat is fixedly connected to the outer wall of the valve body, and a switch valve is installed on the air inlet pipe. This optimized solution allows high-pressure gas to be injected into the inner cavity of the valve seat through the air inlet pipe, and the high-pressure gas enters the cavity of the double-layer sealing ring through the vent hole. When the valve plate and the double-layer sealing ring are in sealing contact, the high-pressure gas seals a further airtight seal between the valve plate and the double-layer sealing ring, preventing toxic, harmful, flammable, and explosive fluids from chemical production from spilling into the cavity and improving the sealing effect.

[0016] As an optimization, two rollers are rotatably mounted on the side wall of the valve plate away from the valve seat, with each roller contacting the inner walls of the valve body on both sides. This optimized design reduces friction during valve plate rotation through the rolling support of the rollers, resulting in smoother rotation and improved durability.

[0017] The beneficial effects of this utility model are as follows: by pulling the valve stem to slide along the straight line of the valve body, the valve plate can be rotated, thereby pressing and sealing the valve seat, which is not easy to damage the sealing surface. In addition, the valve plate adopts the oblique opening and closing method, which makes opening and closing faster and more direct and convenient to use. Furthermore, the sealing performance is improved through the sealing cooperation between the valve plate and the valve seat.

[0018] By axially setting two valve plates on the valve body to seal the two valve seats respectively, the sealing effect is further improved;

[0019] The balancing structure formed by the first and second connecting pipes can balance the pressure before and after the valve plate, making the valve plate easier to open and the valve operation safer and more reliable.

[0020] By setting two valve plates radially on the valve body, two separate channels can be opened, which facilitates the control of the flow rate of large-volume media. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of Example 1;

[0022] Figure 2 for Figure 1 Enlarged view of part A;

[0023] Figure 3 This is a cross-sectional view of Example 2;

[0024] Figure 4 for Figure 3 Enlarged view of part B;

[0025] Figure 5 This is a cross-sectional view of Example 3;

[0026] Figure 6 This is a cross-sectional view of Example 4;

[0027] Figure 7 This is a side view of Example 4;

[0028] Figure 8 for Figure 7 Enlarged view of part C;

[0029] Figure 9 This is a side view of Example 5;

[0030] Figure 10 This is a cross-sectional view of Example 6;

[0031] Figure 11 This is a front view of Example 6;

[0032] Figure 12 This is a side view of Example 6;

[0033] Figure 13 This is a partial sectional view of the side of Example 6;

[0034] Figure 14 This is a sectional view of the guide post;

[0035] As shown in the figure:

[0036] 1. Valve body, 2. DC channel, 3. Valve seat, 4. Single-layer sealing ring, 5. Valve plate, 6. C-type bracket, 7. Second shaft, 8. First shaft, 9. Valve stem, 10. Valve cover, 11. Guide sleeve, 12. Inspection port, 13. Sealing ring, 14. Partition plate, 15. Sub-channel, 16. Guide post, 17. Guide through hole, 18. Guide slide groove, 19. Hinge hole, 20. First connecting pipe, 21. Second connecting pipe, 22. Gate ring, 23. Sealing cap, 24. Slide rod, 25. Vent pipe, 26. Exhaust pipe, 27. Switch valve, 28. Double-layer sealing ring, 29. Vent hole, 30. Air inlet pipe, 31. Roller, 32. Cleaning port. Detailed Implementation

[0037] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0038] Example 1:

[0039] like Figures 1-2 As shown, a DC rotary valve for chemical production includes a valve body 1, a DC channel 2 along the axial direction of the valve body 1, a valve seat 3 fixed in the DC channel 2, and a valve plate 5 sealed to the valve seat 3 inside the valve body 1. The valve plate 5 is rotatably connected to the valve body 1 via a first shaft 8. A valve stem 9, which can drive the valve plate to rotate, is provided on the side of the valve plate 5 away from the valve seat 3. A guide groove 18 is provided on the side of the valve plate 5 away from the valve seat 3. One end of the valve stem 9 is rotatably and slidably connected to the guide groove 18 via a second shaft 7, which is parallel to the first shaft 8. The other end of the valve stem 9 extends obliquely to the outside of the valve body 1.

[0040] Specifically, in this embodiment, the valve seat 3 has an annular structure. The outer diameter of the valve seat 3 is adapted to the inner diameter of the DC channel 2. The valve seat 3 is fixed by connecting the circumferential outer wall of the valve seat 3 to the circumferential inner wall of the DC channel 2. An annular groove is formed inward on the side of the valve seat 3 near the valve plate 5, and a single-layer sealing ring 4 is fixed in the annular groove. The outer diameter of the valve plate 5 is adapted to the outer diameter of the valve seat 3. When the valve plate 5 is rotated to close, the side wall of the valve plate 5 fits against the single-layer sealing ring 4, achieving a sealing fit between the two, thereby achieving the sealing and closure of the DC channel 2 by the valve plate 5.

[0041] The valve body 1 is provided with a hinge hole 19 that mates with the first shaft 8. The diameter of the hinge hole 19 is larger than the outer diameter of the first shaft 8. Specifically, the first shaft 8 is a round shaft, the valve plate is fixedly connected to the first shaft, and a connecting seat is fixedly connected to the valve body 1. The hinge hole 19 is opened on the connecting seat, and the first shaft 8 passes through the hinge hole 19 to realize the rotational connection between the valve plate and the valve body. In this embodiment, the hinge hole 19 is an elongated hole extending along the axial direction of the valve body 1, so that the diameter of the hinge hole is larger than the outer diameter of the first shaft, thereby allowing the first shaft 8 to move axially within the hinge hole 19, and thus allowing the valve plate 5 to move axially. When the valve plate 5 rotates to close, the valve plate 5 can move towards the valve seat 3, thereby pressing the sealing ring 4 on the valve seat 3 and improving the sealing performance.

[0042] Specifically, two C-shaped brackets 6 are fixedly distributed on the side wall of the valve plate 5, and the inner cavity of the C-shaped brackets 6 forms the guide groove 18. Since the first shaft 8 in this embodiment is located at the upper end of the valve plate 5, the guide groove 18 extends in the vertical direction, so that when the valve stem 9 slides along the guide groove 18, it can drive the valve plate 5 to rotate.

[0043] Specifically, the second shaft 7 is a round shaft, and it is sequentially inserted into the inner cavities of the two C-shaped brackets 6, thereby enabling the second shaft 7 to slide along the guide groove 18. Furthermore, since the second shaft 7 is a round shaft, it can rotate within the guide groove 18.

[0044] One end of the valve stem 9 is located between two C-shaped supports 6 and is movably connected to the second shaft. A through hole is provided at the end of the valve stem for the second shaft to pass through. The second shaft 7 passes sequentially through the inner cavity of the C-shaped support 6 and the through hole at the end of the valve stem 9, thereby enabling the valve stem 9 to rotate and slide in relation to the guide groove 18. The other end of the valve stem 9 extends obliquely towards the first shaft 8 and away from the valve plate 5 to the outside of the valve body 1, with the angle between the valve stem 9 and the central axis of the DC channel 2 being 30°~60°. Thus, when the valve stem 9 slides outwards at an angle, the second shaft 7 provides a pulling force to the valve plate 5, thereby causing the valve plate 5 to rotate.

[0045] A guide sleeve 11 is fixedly connected to the outer wall of the valve body 1. The valve stem 9 extends through the guide sleeve 11 to the outside of the valve body 1. A sealing ring 13 is fixedly provided on the inner wall of the guide sleeve 11 to seal with the valve stem 9. The valve stem 9 slides within the guide sleeve 11 to achieve a sliding connection with the valve body. The sealing ring 13 achieves a seal between the valve stem 9 and the guide sleeve 11, improving the sealing performance.

[0046] Specifically, the left and right ends of the valve body 1 are a medium outlet and a medium inlet, respectively, forming a direct current channel 2 between them. The valve body 1 has an inspection port 12 perpendicular to the direct current channel 2, forming an inverted T-shaped flow path with the inspection port 12. A valve cover 1 is bolted to the end of the inspection port 12, thus sealing it and preventing medium leakage. The valve body 1 can be inspected and maintained internally by disassembling the valve cover 10, making it convenient to use.

[0047] In this embodiment, a valve seat 3 is fixedly installed inside the DC channel 2, and a valve plate 5 is correspondingly provided on one side of the valve seat 3. The first shaft 8 is fixedly connected to the upper end of the valve plate 5, and a valve cover 10 is installed on the top of the valve body 1. The valve stem 9 connected to the valve plate 5 extends obliquely upward through the guide sleeve 11 to the outside.

[0048] Flanges can be welded to the medium outlet and medium inlet of valve body 1 for easy connection with other equipment. A linear drive mechanism can be installed on the valve body, which can be a telescopic cylinder or a nut-screw pair, which are existing conventional technologies. The valve stem 9 is driven to slide along the guide sleeve 11 by the linear drive mechanism to open or close the valve.

[0049] In this embodiment, to ensure the safety of the operating equipment, the second shaft 7 can be pulled out during valve installation, allowing the valve plate 5 to rotate freely, as it is a movable part. The conveyed medium enters from the side of the valve plate away from the valve stem, and the flow rate of the medium pushes the valve plate open, achieving self-opening. When an accident occurs, the medium supply stops, and the valve plate falls rapidly under its own weight, closing the valve and achieving self-closing. Simultaneously, the valve stem is driven to further press the valve plate, making the valve safer and more reliable.

[0050] A method for using a DC rotary valve for chemical production includes the following steps: by driving the valve stem 9 to slide away from the valve seat 3 along the guide sleeve 11, the valve plate 5 is rotated around the first shaft 8, opening the valve seat 3 and opening the valve; by driving the valve stem 9 to slide closer to the valve seat 3 along the guide sleeve 11, the valve plate 5 is rotated around the first shaft, the valve plate 5 seals the valve seat 3, and the valve is closed.

[0051] Example 2:

[0052] like Figure 3 , 4As shown, the difference between this embodiment and Embodiment 1 is that: in this embodiment, a vertical first connecting pipe 20 is fixedly connected to the outer wall of the valve body 1, and the first connecting pipe 20 communicates with the cavity on the side of the valve seat 3 away from the valve plate 5. A horizontal second connecting pipe 21 is fixedly connected to the first connecting pipe 20, and the second connecting pipe 21 communicates with the cavity on the side of the valve seat 3 near the valve plate 5. A gate ring 22 is fixedly connected inside the first connecting pipe 20, and the height of the gate ring 22 is lower than the height of the inner cavity of the second connecting pipe 21. A sliding rod 24 that slides up and down is provided inside the first connecting pipe 20, and a sealing cap 23 that seals with the gate ring 22 is fixedly connected to the lower end of the sliding rod 24.

[0053] In this embodiment, the upper end of the first connecting pipe 20 is closed, and the lower end of the first connecting pipe 20 is fixedly connected to the valve body 1. The inner cavity of the first connecting pipe 20 is connected to the DC channel cavity on the right side of the valve seat 3. The second connecting pipe 21 is perpendicular to the first connecting pipe 20. One end of the inner cavity of the second connecting pipe 21 is connected to the inner cavity of the first connecting pipe 20, and the other end is connected to the inspection port 12. When the slide rod 24 slides upward, the sealing cap 23 moves upward to open the gate ring 22, thereby connecting the inner cavities of the first connecting pipe 20 and the second connecting pipe 21. Conversely, when the slide rod slides downward, the sealing cap moves downward to seal with the gate ring, thus isolating the inner cavities of the first connecting pipe and the second connecting pipe.

[0054] When fluid is introduced into the DC channel, the fluid pressure is high, which may make it difficult to open the valve plate 5. At this time, by sliding the sealing cap 23 upward, the inner cavities of the first connecting pipe 20 and the second connecting pipe 21 are connected to form a balanced structure, thereby connecting the cavities on both sides of the valve seat 3. This allows fluid to pass through the first connecting pipe and the second connecting pipe, balancing the pressure on both sides, thus facilitating the opening of the valve plate 5 and requiring less effort.

[0055] Example 3:

[0056] like Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that in this embodiment, two valve seats 3 are distributed axially within the DC channel 2, and the valve plates 5 are respectively provided on the opposite sides of the two valve seats 3. This embodiment achieves bidirectional sealing of the DC channel 2 through the sealing cooperation of the two valve plates 5 with the two valve seats 3, thereby improving the sealing effect.

[0057] Preferably, in this embodiment, the valve body 1 is provided with a vent pipe 25 and an exhaust pipe 26, both of which are connected to the cavity between the two valve seats 3, and both the vent pipe 25 and the exhaust pipe 26 are equipped with a switch valve 27.

[0058] Preferably, in this embodiment, the bottom of the valve body 1 is provided with a cleaning port 32, and a valve cover 10 is fixed to the cleaning port 32 by bolts.

[0059] In operation, when both valve plates 5 are closed, a cavity is formed between the two valve seats 3, sealing the valve plates 5 and valve seats 3, thus forming the first sealing structure. At this time, high-pressure gas is introduced into the cavity between the two valve seats 3 through the vent pipe 25, making the cavity airtight. Because the pressure of the high-pressure gas is greater than the pressure of toxic gases such as sulfur monoxide and sulfur dioxide produced in chemical production, it prevents toxic and harmful gases from overflowing into the cavity, thus forming a second sealing structure. These two sealing structures improve the sealing effect. The exhaust pipe 26 can be connected to a toxic and harmful gas monitoring device, allowing remote monitoring of leakage after the valves are closed.

[0060] When the equipment is shut down, after closing the valve, pressure can be applied through the vent pipe 25 to check the tightness of the sealing surface. After shutdown, the cleaning port 32 can be opened to remove accumulated dust from the valve.

[0061] Example 4:

[0062] like Figure 6 , 7 As shown in Figure 8, the difference between this embodiment and Embodiment 1 is that a partition 14 is fixedly connected inside the DC channel 2, dividing the DC channel into multiple sub-channels 15. Each sub-channel 15 is fixedly equipped with a valve seat 3, and each valve seat 3 is correspondingly equipped with a valve plate 5. The outer diameter of the valve seat 3 matches the inner diameter of the sub-channel 15, and the circumferential outer wall of the valve seat 3 is fixedly connected to the circumferential inner wall of the sub-channel 15. By setting multiple sub-channels 15, a portion of the flow rate of the DC channel 2 is discharged, thereby facilitating the control of the flow rate of large-flow media.

[0063] Specifically, in this embodiment, the partition 14 has an "I"-shaped structure, and the DC channel 2 is divided into two vertically distributed sub-channels 15 by the partition 15. A valve seat 3 is fixedly connected to each of the two sub-channels 15. The valve body 1 contains two valve plates 5, which are sealed to the two valve seats 3 one by one, and the two valve plates 5 are located on the same side of the two valve seats 3. By sealing the two sub-channels 15 with the two valve plates 5, the DC channel 2 is sealed.

[0064] Preferably, in this embodiment, the bottom of the valve body 1 is provided with a cleaning port 32, and a valve cover 10 is fixed to the cleaning port 32 by bolts.

[0065] Preferably, in this embodiment, the valve seat 3 is hollow, and a hollow double-layer sealing ring 28 is fixedly connected to the side of the valve seat 3 facing the valve plate. The inner cavity of the valve seat 3 is connected to the cavity of the double-layer sealing ring 28 through a vent hole 29. An air inlet pipe 30 communicating with the inner cavity of the valve seat 3 is fixedly connected to the outer wall of the valve body 1, and a switching valve 27 is installed on the air inlet pipe 30.

[0066] When valve plate 5 is closed, a first sealing structure is formed between valve plate 5 and double-layer sealing ring 28. At this time, high-pressure gas is injected into the inner cavity of valve seat 3 through air inlet pipe 30, and the high-pressure gas enters the cavity of double-layer sealing ring 28 through vent hole 29. When valve plate 5 and double-layer sealing ring 28 are in sealed contact, the high-pressure gas seals a second airtight seal between valve plate 5 and double-layer sealing ring 28, thus forming a second sealing structure. This prevents toxic gases from escaping into the cavity during chemical production, and the two sealing structures improve the sealing effect. Alternatively, leakage monitoring after valve closure and tightness testing after shutdown can also be performed through air inlet pipe 30.

[0067] Preferably, in this embodiment, two rollers 31 are rotatably mounted on the side wall of the valve plate 5 away from the valve seat 3, and the two rollers 31 respectively contact the inner walls of the valve body 1 on both sides. When the valve plate 5 rotates, the rollers 31 roll along the inner wall of the valve body 1, and the support of the rollers 31 reduces the friction when the valve plate 5 rotates, making the rotation of the valve plate 5 smoother and improving its durability.

[0068] In this embodiment, the upper end of the upper valve plate 5 is fixed to the first shaft 8, and the lower end of the lower valve plate 5 is fixed to the first shaft 8. The valve cover 10 is provided at the top and bottom of the valve body 1 respectively. The valve rod 9 connected to the upper valve plate 5 extends upward through the valve body 1 to the outside, and the valve rod 9 connected to the lower valve plate 5 extends downward through the valve body 1 to the outside.

[0069] This embodiment applies to a large-diameter valve body 1. The large-diameter valve body 1 contains a large medium flow rate. Two valve plates 5 can be used to open two separate channels 15, facilitating control of the large flow rate. If a small medium flow rate is required, only the upper valve plate 5 can be opened, allowing only half of the medium to flow out through the upper channel 15. If a large medium flow rate is required, both valve plates 5 can be fully opened, allowing all the medium in the direct current channel 2 to flow out.

[0070] Example 5:

[0071] like Figure 9 As shown, the difference between this embodiment and embodiment 4 is that the partition is a cross-shaped structure, and the DC channel is divided into four sub-channels by the partition. A valve seat 3 is fixedly connected to each of the four sub-channels 15, and the valve body 1 has four valve plates 5, with each valve plate 5 and valve seat 3 sealingly engaging. By sealing the four sub-channels 15 with the four valve plates 5, the DC channel 2 is sealed. Increasing the number of sub-channels improves flow control accuracy.

[0072] Example 6:

[0073] like Figures 10-14As shown, the difference between this embodiment and embodiment 4 is that the upper end of the lower valve plate 5 is fixedly connected to the first shaft 8, and the lower valve plate is rotatably connected to the partition plate 14 through the first shaft.

[0074] In this embodiment, hollow guide posts 16 are provided on the outer walls of the valve body 1 and the second shaft 7 at opposite ends. The inner cavity of the guide post 16 and the DC channel 2 are connected through the guide through hole 17. The extension direction of the guide post 16 is the same as the tilt direction of the valve stem 9, and the extension direction of the guide through hole 17 is the same as the extension direction of the guide post 16.

[0075] The two ends of the second shaft 7 connected to the lower valve plate 5 extend through two guide holes 17 into the inner cavities of two guide posts 16. Valve stems 9 are fixedly connected to both ends of the second shaft 7, and the two valve stems 9 are respectively in a sealing sliding connection with the two guide posts 16. In this embodiment, the valve stems 9 extend upwards through the guide posts 16 to the outside, and a sealing ring 13 is fixedly provided in the inner cavity of the guide posts 16 to seal against the valve stems 9.

[0076] By providing guide posts 16 on both sides of the valve body 1, the valve stem 9 connected to the lower valve plate 5 is moved into the guide posts 16, thus facilitating the extension of the valve stem 9 to the outside of the valve body 1. When the valve stem 9 slides along the guide posts 16, the second rotating shaft 7 can move along the guide through hole 17, thereby driving the rotation of the lower valve plate 5. Since the valve stem of the lower valve plate in this embodiment is located on the side of the valve body, the overall size of the valve is reduced, thus minimizing space occupation.

[0077] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A DC rotary valve for chemical production, comprising a valve body (1), a DC channel (2) provided along the axial direction of the valve body (1), a valve seat (3) fixedly disposed in the DC channel, and a valve plate (5) provided inside the valve body (1) for sealing cooperation with the valve seat (3), characterized in that: The valve plate (5) is rotatably connected to the valve body (1) through a first shaft body (8). A valve stem (9) is provided on one side of the valve plate (5) away from the valve seat. A guiding chute (18) is provided on the surface of the valve plate (5) away from the valve seat. One end of the valve stem (9) is rotatably and slidably connected to the guiding chute (18) through a second shaft body (7). The second shaft body (7) is parallel to the first shaft body (8). The other end of the valve stem (9) extends obliquely to the outside of the valve body (1).

2. The DC rotary valve for chemical production according to claim 1, characterized in that: An articulated hole (19) matching the first shaft body (8) is provided on the valve body (1). The aperture of the articulated hole is larger than the outer diameter of the first shaft body (8).

3. The DC rotary valve for chemical production according to claim 1 or 2, characterized in that: A guiding sleeve (11) is fixedly connected to the outer wall of the valve body (1). The valve stem (9) passes through the guiding sleeve (11) and extends to the outside of the valve body (1). A sealing ring (13) that is hermetically matched with the valve stem (9) is fixedly provided on the inner wall of the guiding sleeve (11).

4. The DC rotary valve for chemical production according to claim 1, characterized in that: A vertical first connecting pipe (20) is fixedly connected to the outer wall of the valve body (1). The first connecting pipe is communicated with the cavity on one side of the valve seat (3). A horizontal second connecting pipe (21) is fixedly connected to the first connecting pipe (20). The second connecting pipe is communicated with the cavity on the other side of the valve seat (3). A brake ring (22) is fixedly connected in the first connecting pipe (20). The height of the brake ring is lower than the height of the inner cavity of the second connecting pipe (21). A sliding rod (24) that slides up and down is provided in the first connecting pipe (20). A sealing cap (23) that is hermetically matched with the brake ring (22) is fixedly connected to the lower end of the sliding rod.

5. The DC rotary valve for chemical production according to claim 1, characterized in that: Two valve seats (3) are distributed axially in the direct current channel (2). Valve plates (5) are correspondingly provided on both sides of the two valve seats away from each other.

6. The DC rotary valve for chemical production according to claim 5, characterized in that: A ventilation pipe (25) and an exhaust pipe (26) are provided on the valve body (1). The ventilation pipe and the exhaust pipe are both communicated with the cavity between the two valve seats (3). Switch valves (27) are installed on both the ventilation pipe and the exhaust pipe.

7. The DC rotary valve for chemical production according to claim 1, characterized in that: A partition plate (14) is fixedly connected in the direct current channel (2). The partition plate (14) divides the direct current channel (2) into multiple sub-channels (15). A valve seat (3) is fixedly provided in each sub-channel. A valve plate (5) is correspondingly provided for each valve seat.

8. The DC rotary valve for chemical production according to claim 7, characterized in that: The partition plate (14) is of a "one" - shaped structure. The direct current channel is divided by the partition plate to form two sub-channels distributed vertically.

9. The DC rotary valve for chemical production according to claim 8, characterized in that: Hollow guiding columns (16) are provided on both outer walls of the valve body (1) opposite to the two ends of the second shaft body (7). The inner cavity of the guiding column (16) and the direct current channel (2) are communicated through a guiding through hole (17). The extending direction of the guiding through hole (17) is the same as the extending direction of the guiding column (16). The lower valve plate (5) is rotatably connected to the partition plate (14). The two ends of the second shaft body (7) connected to this valve plate (5) respectively pass through the guiding through hole (17) and extend into the inner cavity of the guiding column (16). Valve stems (9) are fixedly connected to the two ends of the second shaft body (7). The two valve stems (9) are respectively hermetically and slidably connected to the two guiding columns (16).

10. The DC rotary valve for chemical production according to claim 7, characterized in that: The partition plate (14) is of a "cross" - shaped structure. The direct current channel is divided by the partition plate to form four sub-channels.

11. The DC rotary valve for chemical production according to any one of claims 7 to 10, characterized in that: The valve seat (3) is hollow, and a hollow double-layer sealing ring (28) is fixed to the side of the valve seat (3) facing the valve plate (5). The inner cavity of the valve seat (3) is connected to the cavity of the double-layer sealing ring (28) through the vent hole (29). An air inlet pipe (30) connected to the inner cavity of the valve seat (3) is fixed to the outer wall of the valve body (1). A switch valve (27) is installed on the air inlet pipe (30).

12. The DC rotary valve for chemical production according to any one of claims 7 to 10, characterized in that: Two rollers (31) are rotatably mounted on the side wall of the valve plate (5) away from the valve seat (3), and the two rollers (31) are in contact with the inner walls of the valve body (1) on both sides respectively.

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