Discharging knife gate valve with blowing function

Abstract

The utility model discloses a sluice valve with a purging function for discharging. The sluice valve comprises an air cylinder, a movable protective cover, a valve body, a valve plate, a valve rod, a purging hole and a purging pipe. A valve rod is arranged below the air cylinder and is driven by the air cylinder to telescopically move; a valve plate is arranged at the lower end of the valve rod and can move upwards or downwards under the driving of the valve rod; the valve rod and the valve plate are movably arranged in the movable protective cover; a valve body is arranged below the movable protective cover; the valve plate moves downwards and then enters a valve body cavity in the valve body; a plurality of groups of purging holes are formed in the outer side edge of the valve body; the purging hole is communicated with a valve body cavity in the valve body; a purging pipe is arranged on each group of purging holes; and an air source assembly is arranged at the air inlet end of the purging pipe. An air source blows air through the purging main pipe, the air can reach all the purging holes from the purging branch pipes, and the air is sprayed out from the purging holes to purge the surface of the valve seat in the valve body, so that fluid materials attached to the valve seat are purged to be clean. And the influence of fluid material accumulation on driving of the valve plate and the sealing performance of the valve plate is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of pneumatic knife gate valves, in particular to a knife gate valve with a purge function for discharging materials. Background Art

[0002] The pneumatic knife gate valve is a valve driven by compressed air. The cylinder drives the valve stem, which in turn drives the valve plate to open or close the valve. The pneumatic knife gate valve is divided into two parts, the upper part is the cylinder, and the lower part is the valve. The valve plate moves up and down in the valve body, and the direction of movement is perpendicular to the direction of the fluid. The valve plate moves downward to cut off the fluid and close the valve; the valve plate moves upward to open the valve.

[0003] A valve seat is set in the inner ring of the valve body. The purpose of the valve seat is to ensure a good seal of the valve plate. However, when the pneumatic knife gate valve is used to discharge materials at the bottom of a hopper or storage tank, some granular or powdery fluid substances will accumulate at the valve seat. When the accumulation is too much, it will cause the valve plate to get stuck or the valve plate to not seal tightly. Utility Model Content

[0004] The utility model provides a knife gate valve with a purge function for discharging, wherein a purge hole is provided on the side of the valve body, and a purge branch pipe is provided on each purge hole, and all the purge branches are connected to the purge main pipe; an air source blows air through the purge main pipe and can reach each purge hole from the purge branch pipe, and the gas is ejected from the purge hole to purge the surface of the valve seat in the valve body, and clean the fluid material attached to the valve seat, thereby preventing the fluid material from accumulating on the valve seat and affecting the normal drive of the valve plate and the sealing performance of the valve plate.

[0005] In order to achieve the above technical objectives, the present invention is implemented through the following technical solutions:

[0006] A knife gate valve with a purge function for discharging, comprising: a cylinder, a movable protective cover, a valve body, a valve plate, a valve stem, a purge hole, and a purge pipe;

[0007] A valve stem is provided below the cylinder, and the valve stem is capable of telescopic movement under the drive of the cylinder;

[0008] A valve plate is provided at the lower end of the valve stem, and the valve plate can move upward or downward under the drive of the valve stem;

[0009] The valve stem and the valve plate are movably arranged in the movable protective cover;

[0010] A valve body is provided below the movable protective cover; the valve plate moves downward and enters the valve body cavity in the valve body;

[0011] The outer side of the valve body is provided with a plurality of purge holes; the purge holes are communicated with the valve body cavity in the valve body.

[0012] A purge pipe is provided on each group of the purge holes; and an air source component is provided at the air inlet end of the purge pipe.

[0013] Preferably, a first end of a ferrule connector is provided on each group of the purge holes;

[0014] The second end of the ferrule connector is connected to the first end of the purge branch pipe;

[0015] The second end of the purge branch pipe is connected to the purge main pipe through a three-way joint;

[0016] An air source component is provided at the air inlet end of the purge main pipe.

[0017] Preferably, a ferrule ball valve is provided near the air inlet end of the purge main pipe and on the purge main pipe;

[0018] The ferrule ball valve is used to control the opening or shutoff of the gas generated by the gas source component entering the purge main pipe.

[0019] Preferably, a solenoid valve is provided near the air inlet end of the purge main pipe and on the purge main pipe;

[0020] The solenoid valve is communicatively connected to a PLC; and the PLC is communicatively connected to a timer or a cylinder control component.

[0021] Preferably, a group of solenoid valves is provided on the purge branch pipe corresponding to each group of purge holes;

[0022] The solenoid valve is communicatively connected to the PLC.

[0023] Preferably, the movable protective cover comprises: a bracket plate and a valve plate protective cover;

[0024] The bracket plates are symmetrically arranged one at the front and one at the back;

[0025] The valve plate protective cover is provided on both the left and right sides of the two bracket plates by fixing screws;

[0026] The two support plates and the two valve plate protective covers form a movable protective cover which is closed on four sides.

[0027] Preferably, the lower end of the valve stem is embedded in the upper end of the connecting sleeve;

[0028] The upper end of the valve plate is embedded in the lower end of the connecting sleeve;

[0029] The valve plate and the connecting sleeve are fixed via connecting pins;

[0030] The valve stem and the valve plate form an indirect connection relationship through the connecting sleeve, thereby enabling the valve plate to follow the movement of the valve stem.

[0031] Preferably, the interior of the valve body is located at the upper position, and a set of packing glands are provided on both sides of the valve plate;

[0032] Two packing pads are provided under each group of packing glands;

[0033] The hollow structure between the two packing pads is filled with packing.

[0034] Preferably, a valve seat is provided on the inner ring of the inlet end of the valve body; the valve seat is fixed by a valve seat pressing plate; the purge hole passes through the valve seat;

[0035] The side of the valve plate close to the inlet end is always in contact with the valve seat.

[0036] Preferably, a fixed guide is provided on the outlet end of the valve body;

[0037] The fixed guide member includes: a threaded cap, a threaded segment positioning rod and a buffer pad;

[0038] The threaded cap is arranged on the inner ring side wall of the outlet end of the valve body;

[0039] The threaded cap is provided with the threaded segment positioning rod through threaded engagement;

[0040] A screw cap is provided at the first end of the screw segment positioning rod, and a buffer pad is provided at the second end of the screw segment positioning rod;

[0041] The threaded segment positioning rod is screwed, and when the screw cap is completely located in the threaded cap, the buffer pad just contacts the surface of the valve plate;

[0042] The screw segment positioning rod and the buffer pad will not hinder the normal rise or fall of the valve plate.

[0043] The beneficial effects of the utility model are:

[0044] The utility model provides a knife gate valve with a purge function for discharging, wherein a plurality of purge holes are provided on the outer side of the valve body, and each group of purge holes is connected to a purge main pipe through a purge branch pipe; gas passes through the purge main pipe, and the purge branch pipe is sprayed out from the purge holes, and the fluid material remaining in the valve body is cleaned by the air flow, thereby preventing the fluid material from accumulating in the valve body, especially at the valve seat position, which may cause the valve plate to become stuck or the valve plate to be loosely sealed.

[0045] A solenoid valve is set on the purge main pipe, and the solenoid valve communicates with the PLC, and the PLC is connected to a timer or a cylinder control component. At fixed intervals, the PLC will control the solenoid valve to open, thereby purging the valve body. Timed purging can avoid the accumulation of fluid materials in the valve body. Or when the PLC detects that the cylinder control component drives the valve stem to drive the valve plate to move up, and when the valve is opened, the PLC will control the solenoid valve to open and purge the valve body. In this way, the valve is purged every time it is opened, which can ensure that the valve body, especially the valve seat, remains clean and free of material residue.

[0046] A solenoid valve is also provided on each set of purge branch pipes. When there is obvious material residue at the valve body position corresponding to a certain set of purge holes, the position corresponding to the certain set of purge holes can be purged and cleaned separately.

[0047] A fixed guide is provided at the outlet end of the valve body. A section of the fixed guide contacts the valve plate, which can support and position the valve plate and guide it when it moves up or down, thereby preventing the valve plate from deforming under the impact of the fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0049] Figure 1 This is a schematic diagram of the overall structure of the front side of the utility model;

[0050] Figure 2 It is a side structural schematic diagram of the utility model;

[0051] Figure 3 This is a schematic structural diagram of the movable protective cover, valve body, purge hole, and purge branch pipe and purge main pipe connected to the purge hole of the utility model;

[0052] Figure 4 This is a side sectional view of the internal structure of the valve body of the utility model;

[0053] Figure 5 This is a partial enlarged schematic diagram A of the present invention; specifically, it is a schematic diagram of the structural relationship between the valve seat, the valve seat pressure plate and the valve plate in the valve body;

[0054] Figure 6 This is a partial enlarged schematic diagram B of the present invention; specifically, it is a schematic diagram of the structure of the fixed guide member provided at the outlet end of the valve body.

[0055] In the accompanying drawings, the structural names represented by the reference numerals are:

[0056] 1-valve body, 2-valve seat, 3-valve seat pressure plate, 4-valve plate, 5-locating pin, 6-packing pad, 7-packing packing, 8-packing gland, 9-connecting pin, 10-connecting sleeve, 11-cylinder, 12-bracket plate, 13-valve plate protection cover, 14-compression fitting, 15-fixed guide, 1501-threaded cap, 1502-threaded positioning rod, 1503-buffer pad, 16-purge main pipe, 1601-purge branch pipe, 17-tee joint, 18-compression fitting ball valve, 19-valve stem. DETAILED DESCRIPTION

[0057] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0058] Example 1

[0059] A knife gate valve with a purge function for discharging, comprising: a cylinder 11, a movable protective cover, a valve body 1, a valve plate 4, a valve stem 19, a purge hole, and a purge pipe;

[0060] like Figure 1 As shown, a telescopic rod is provided inside the cylinder 11. Under the action of the cylinder control assembly, the extension and contraction of the telescopic rod are achieved by compressed air in the cylinder 11. The cylinder control assembly, the structure and working principle between the cylinder 11 and the telescopic rod all belong to the prior art, and this embodiment does not make any technical improvements to the cylinder 11, so its structure will not be described in detail.

[0061] The telescopic rod of the cylinder 11 serves as the valve stem 19 of the pneumatic knife gate valve. The valve plate 4 is connected to the lower end of the valve stem 19. The telescopic movement of the valve stem 19 can drive the valve plate 4 to move up and down synchronously. The valve plate 4 of the pneumatic knife gate valve moves in a direction perpendicular to the fluid material, thereby realizing the opening or closing of the gate valve; Figure 4 As shown, the connection relationship between the valve stem 19 and the valve plate 4 is as follows: the valve stem 19 and the valve plate 4 are indirectly connected through the connecting sleeve 10, an embedding hole is provided on the upper end surface of the connecting sleeve 10, the lower end of the valve stem 19 is embedded in the embedding hole, and is fixedly connected to the embedding hole; an embedding groove is provided on the lower end surface of the connecting sleeve 10, the upper end of the valve plate 4 is embedded in the embedding groove, and a connecting pin 9 is inserted between the connecting sleeve 10 and the valve plate 4, and the connecting pin 9 is used to fix the connecting sleeve 10 and the valve plate 4; in this way, the valve plate 4 can synchronously follow the movement of the valve stem 19.

[0062] The valve stem 19 and the valve plate 4 are arranged in a movable protective cover, and the valve body 1 is arranged below the movable protective cover. When the valve stem 19 gradually extends, it drives the valve plate 4 to gradually move into the valve body 1. When the valve plate 4 completely cuts off the valve body 1, the valve body 1 is in a closed state. On the contrary, when the valve stem 19 gradually contracts, it drives the valve plate 4 to gradually move into the movable protective cover, and the valve body 1 gradually opens.

[0063] like Figure 3 As shown, the above-mentioned movable protective cover includes: a bracket plate 12 and a valve plate protective cover 13;

[0064] The support plates 12 are symmetrically arranged one at the front and one at the back. Valve plate protective covers 13 are attached to the left and right sides of each support plate 12 via fixing screws. The two support plates 12 and the two valve plate protective covers 13 form a movable protective cover that is enclosed on all four sides. The movement of the valve stem 19 and the valve plate 4 is controlled within the movable protective cover.

[0065] The valve plate 4 and the valve body 1 are made of metal. When the valve plate 4 moves up and down relative to the valve body 1 to open or close the valve, it will generate large contact friction and noise. In addition, the sealing between the valve plate 4 and the valve body 1 is insufficient, which may cause leakage of fluid materials.

[0066] So, if Figure 4 As shown, a set of packing glands 8 are provided above the valve body 1 and on both sides of the valve plate 4. Two packing pads 6 are provided below each set of packing glands 8. A hollow structure is formed between the two packing pads 6, and a packing 7 is inserted into the hollow structure. The provision of packing improves the sealing performance of the upper portion of the valve body 1.

[0067] In order to further improve the blocking sealing performance of the valve plate 4 to the fluid material when the valve plate 4 is in the cut-off sealing state, as shown in FIG. Figure 4 As shown, a valve seat 2 is provided on the inner ring bottom plate of the inlet end on the left side of the valve body 1, and the valve seat 2 is fixed by a valve seat pressing plate 3; the side of the valve plate 4 close to the inlet end is always in contact with the valve seat 2; by providing the valve seat 2, the sealing performance of the valve plate 4 can be improved.

[0068] When the pneumatic knife gate valve is used in a silo or storage tank for some granular, powdery materials, etc., when the above-mentioned granular or powdery materials pass through the pneumatic knife gate valve, it is inevitable that residue will form on the inner ring bottom plate of the valve body 1, especially on the valve seat 2; when the residual material accumulates more and more, it will cause the normal opening of the valve plate 4 to become stuck; it may also cause the valve seat 2 to deform, affecting the sealing performance of the valve plate 4.

[0069] So, if Figure 3As shown, in this embodiment, five groups of purge holes are opened on the outer side of the valve body 1, and each group of purge holes is connected to the valve cavity, that is, the purge holes pass through the side wall of the valve body 1 and the valve seat 2; a purge pipe is provided on each group of purge holes, and air flow is provided through the purge pipe to clean the residual accumulated materials in the valve body 1, especially the valve seat 2, to prevent their accumulation; Figure 3 As shown, the purge pipe connection structure is configured as follows: each set of purge holes is connected to the first end of a ferrule connector 14, the second end of which is connected to the first end of a purge branch pipe 1601; the second end of each purge branch pipe 1601 is connected to a purge main pipe 16 via a tee connector 17, and an air source assembly is provided at the air inlet end of each purge main pipe 16. The air source assembly provides airflow, which flows along the purge main pipe 16 to each purge branch pipe 1601 and is ejected from the corresponding purge hole of each purge branch pipe 1601 to purge and clear any residual material in the area corresponding to the purge hole. The air source assembly can be a compressed air tank or an air pump.

[0070] As a preferred embodiment, a ferrule ball valve 18 is provided near the air inlet end of the purge main pipe 16 and on the purge main pipe 16; when the ferrule ball valve 18 is opened, the airflow generated by the air source component will enter the purge main pipe 16; conversely, when the ferrule ball valve 18 is closed, the airflow generated by the air source component will be cut off.

[0071] Example 2

[0072] Based on Example 1, in Example 1, the opening or shutoff of the airflow is controlled by a manually controlled ferrule ball valve 18, thereby controlling the purge of the inside of the valve body 1; the manual operation is controlled by humans, and it is necessary to check at all times whether there is too much material residue in the valve body 1, which will cause jamming of the valve plate 4; whether it is necessary to manually open the airflow to purge the valve body 1; usually, there will be multiple storage bins in the warehouse, and each storage bin will be equipped with at least one set of pneumatic knife gate valves; manually checking each set of pneumatic knife gate valves at all times may result in omissions.

[0073] In this embodiment, the sleeve ball valve 18 in Example 1 is replaced with a solenoid valve; the solenoid valve is communicatively connected to a PLC, and the PLC is also communicatively connected to a timer; the timer is used to set the purge time interval; when the set time interval is reached, the PLC sends a control instruction to the control component of the solenoid valve, driving the solenoid valve to open, and the valve body 1 is purged by airflow; in this way, the valve body 1 can be purged once after a fixed time interval, and the valve body 1, especially the valve seat 2, can be purged and cleaned;

[0074] As a preferred embodiment, in addition to installing a timer as mentioned above to purge and clean the valve body 1 for a fixed period of time, the valve body 1 can also be purged each time the valve plate 4 moves upward to open the valve body 1.

[0075] Similarly, the solenoid valve is still connected to the PLC through communication, and the cylinder control component is also connected to the PLC; when the PLC detects that the cylinder control component controls the telescopic rod to retract, driving the valve plate 4 to move upward and opening the gate valve, the PLC will send a control instruction to the solenoid valve to open it; each time the valve body 1 is opened, the valve body 1 can be purged once.

[0076] Example 3

[0077] Based on Example 2, in Example 2, the solenoid valve is arranged at the air inlet end near the purge main pipe 16; when the solenoid valve is opened, the air flow will enter all the purge branches 1601 from the purge main pipe 16; each group of purge holes will spray air flow for purge; no matter how much material remains in the area corresponding to the purge hole, gas with the same air pressure will be sprayed for purge.

[0078] In this embodiment, on the basis of retaining the solenoid valve on the purge main pipe 16, a group of solenoid valves are set on the purge branch pipe 1601 corresponding to each group of purge holes, and the solenoid valves on the purge branch pipe 1601 are also communicatively connected to the PLC; in this way, when the solenoid valve on the purge main pipe 16 is opened, the solenoid valves on a certain group or several groups of purge branches 1601 can be selected to be opened through PLC input control; in this way, only the groups of purge holes with opened solenoid valves will spray air, and the corresponding areas with more residual materials will be targeted for purge and cleaning; and since the air source amount remains unchanged and the air flow outlet is reduced, the air flow pressure and flow rate sprayed from each purge hole increases, and a better purge and cleaning effect is achieved.

[0079] Example 4

[0080] Based on Example 1, when the valve plate 4 is opened, the material will have a certain impact force on the valve plate 4 when entering from the left and exiting from the valve body 1 from the right. In order to ensure that the movement trajectory of the valve plate 4 is always vertical and vertical, and to prevent the valve plate 4 from being deformed under the impact, this embodiment provides a fixed guide 15 at the outlet end of the valve body 1; one end of the fixed guide 15 is always in contact with one surface of the valve plate 4, but does not affect the up and down movement of the valve plate 4; the fixed guide 15 can support the valve plate 4 from the opposite direction of the material and guide the up and down movement of the valve plate 4;

[0081] The fixed guide 15 includes a threaded cap 1501, a threaded segment positioning rod 1502, and a buffer pad 1503. The threaded cap 1501 is hollow and extends through both ends. A threaded structure is provided on the inner wall of the threaded cap 1501. The threaded cap 1501 is mounted on the inner sidewall of the outlet end of the valve body 1. The threaded segment positioning rod 1502 is threadedly mounted within the threaded cap 1501. A screw cap is mounted on the first end of the threaded segment positioning rod 1502, and a buffer pad 1503 is mounted on the second end of the threaded segment positioning rod 1502. When the screw cap is fully seated in the threaded cap 1501, the buffer pad 1503 contacts the surface of the valve plate 4. The threaded segment positioning rod 1502 and the buffer pad 1503 do not interfere with the normal ascent or descent of the valve plate 4. The buffer pad 1503 provides a soft contact between the threaded segment positioning rod 1502 and the valve plate 4, providing a cushioning effect.

[0082] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0083] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, numerous modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A knife gate valve with a purge function for discharging, characterized in that: include: Cylinder, movable protective cover, valve body, valve plate, valve stem, purge hole, purge pipe; A valve stem is provided below the cylinder, and the valve stem is capable of telescopic movement under the drive of the cylinder; A valve plate is provided at the lower end of the valve stem, and the valve plate can move upward or downward under the drive of the valve stem; The valve stem and the valve plate are movably arranged in the movable protective cover; A valve body is provided below the movable protective cover; the valve plate moves downward and enters the valve body cavity in the valve body; A plurality of purge holes are provided on the outer side of the valve body; the purge holes are communicated with the valve body cavity in the valve body; A purge pipe is provided on each group of the purge holes; and an air source component is provided at the air inlet end of the purge pipe.

2. A knife gate valve with a purge function for discharging according to claim 1, characterized in that: A first end of a ferrule connector is provided on each group of purge holes; The second end of the ferrule connector is connected to the first end of the purge branch pipe; The second end of the purge branch pipe is connected to the purge main pipe through a three-way joint; An air source component is provided at the air inlet end of the purge main pipe.

3. A knife gate valve with a purge function for discharging according to claim 2, characterized in that: A ferrule ball valve is provided near the air inlet end of the purge main pipe and on the purge main pipe; The ferrule ball valve is used to control the opening or shutoff of the gas generated by the gas source component entering the purge main pipe.

4. A knife gate valve with a purge function for discharging according to claim 2, characterized in that: A solenoid valve is provided near the air inlet end of the purge main pipe and on the purge main pipe; The solenoid valve is communicatively connected to a PLC; and the PLC is communicatively connected to a timer or a cylinder control component.

5. The knife gate valve with purge function for discharging according to claim 2, characterized in that: A group of solenoid valves is provided on the purge branch pipe corresponding to each group of purge holes; The solenoid valve is communicatively connected to the PLC.

6. The knife gate valve with purge function for discharging according to claim 1, characterized in that: The movable protective cover includes: a bracket plate and a valve plate protective cover; The bracket plates are symmetrically arranged one at the front and one at the back; The valve plate protective cover is provided on both the left and right sides of the two bracket plates by fixing screws; The two support plates and the two valve plate protective covers form a movable protective cover which is closed on four sides.

7. The knife gate valve with purge function for discharging according to claim 1, characterized in that: The lower end of the valve stem is embedded in the upper end of the connecting sleeve; The upper end of the valve plate is embedded in the lower end of the connecting sleeve; The valve plate and the connecting sleeve are fixed via connecting pins; The valve stem and the valve plate are indirectly connected via the connecting sleeve.

8. The knife gate valve with purge function for discharging according to claim 1, characterized in that: The interior of the valve body is located at the upper position, and a set of packing glands are provided on both sides of the valve plate; Two packing pads are provided under each group of packing glands; The hollow structure between the two packing pads is filled with packing.

9. The knife gate valve with purge function for discharging according to claim 1, characterized in that: A valve seat is provided on the inner ring of the inlet end of the valve body; the valve seat is fixed by a valve seat pressing plate; the purge hole passes through the valve seat; The side of the valve plate close to the inlet end is always in contact with the valve seat.

10. The knife gate valve with purge function for discharging according to claim 1, characterized in that: A fixed guide is provided on the outlet end of the valve body; The fixed guide member includes: a threaded cap, a threaded segment positioning rod and a buffer pad; The threaded cap is arranged on the inner ring side wall of the outlet end of the valve body; The threaded cap is provided with the threaded segment positioning rod through threaded engagement; A screw cap is provided at the first end of the screw segment positioning rod, and a buffer pad is provided at the second end of the screw segment positioning rod; The threaded segment positioning rod is screwed, and when the screw cap is completely located in the threaded cap, the buffer pad just contacts the surface of the valve plate; The screw segment positioning rod and the buffer pad will not hinder the normal rise or fall of the valve plate.

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