Double-clip type knife gate valve

Abstract

The utility model relates to the field of knife gate valves, in particular to a wafer type knife gate valve which comprises a shell and a sealing assembly. A sliding seat is arranged on the shell, and a valve plate is slidably connected into the sliding seat. The sealing assembly comprises two sealing rings distributed in the shell in the front-back direction, filling rings arranged on the sealing rings, two end cover plates arranged on the outer sides of the sealing rings correspondingly and annular rings arranged on the end cover plates, the annular rings abut against the sealing rings, grooves are formed between the shell and the sealing rings, the sealing rings are attached to the valve plate, and the sealing rings are arranged in the grooves. The filling ring abuts against the shell. The long-time sealing performance of the valve body can be kept, and meanwhile the defect that the sealing effect is affected by shaking of the valve plate can be overcome.

Description

Technical Field

[0001] The utility model relates to the field of knife gate valves, in particular to a wafer type knife gate valve. Background Technique

[0002] The wafer type knife gate valve is a valve widely used in various industrial fields. It is particularly suitable for cutting media containing suspended particles and fibrous materials, such as pulp, sewage, coal slurry, ash slag cement mixture, etc. The design of this valve enables it to effectively cut fibrous materials, and due to its structural characteristics, it occupies less space in the pipeline system, can effectively support the pipeline strength, and reduce the possibility of pipeline vibration.

[0003] Chinese Patent Publication No. CN209414657U discloses a wafer type knife gate valve with high stability, including a valve body, a valve plate, a valve seat assembly, a valve stem, a column, a connecting plate, and a transition plate; an oil-impregnated asbestos packing is also arranged between the valve plate and the valve body; a gland is arranged at the upper end of the oil-impregnated asbestos packing; the gland is fixed on the valve seat assembly through bolts and nuts; the valve plate and the valve stem are connected through a connecting plate; a clamping groove adapted to the width of the valve plate is formed on the lower surface of the connecting plate; pin holes communicating with the outer wall of the connecting plate are formed on both inner walls of the clamping groove; a number of protruding tooth strips are also arranged on the inner wall of the clamping groove; installation areas adapted to the area of the clamping groove are arranged at the upper ends of both sides of the valve plate; a number of clamping grooves engaged with the protruding tooth strips are formed on the installation areas; through holes adapted to the pin holes are also arranged on the installation areas of the valve plate; the technical solution adopted by this knife gate valve solves the problem that the connection between the valve plate and the valve stem of the existing knife gate valve is unstable due to the loosening of screws, resulting in shaking during the lifting and lowering process of the valve plate and affecting the sealing effect.

[0004] However, the above technical solution has the following deficiencies: when connecting the connecting plate and the valve plate of this knife gate valve, it is fixed by engaging the convex tooth strip with the horizontal clamping groove or by clamping the convex tooth strip with the inclined groove. However, in the actual installation process, it is not easy to push the connecting plate into the installation area whether it is the horizontal clamping groove or the inclined groove, which increases the installation difficulty, and during the multiple up and down movements of the valve plate, the sealing ring is easily worn, affecting the sealing effect of the equipment. Content of the Utility Model

[0005] The purpose of the utility model is to address the problems in the background technique and propose a wafer type knife gate valve that can not only maintain the long-term sealing performance of the valve body but also avoid the drawback that the shaking of the valve plate affects the sealing effect.

[0006] The technical solution of the present utility model is a wafer - type knife gate valve, which includes a housing and a sealing assembly; a sliding seat is arranged on the housing, and a valve plate is slidably connected inside the sliding seat; the sealing assembly includes two sealing rings distributed front and back inside the housing, packing rings arranged on the sealing rings, two end covers respectively arranged outside the sealing rings, and an annular ring arranged on the end covers. The annular ring abuts against the sealing ring, a groove is arranged between the housing and the sealing ring, the sealing ring is in mutual fit with the valve plate, and the packing ring abuts against the housing.

[0007] Preferably, six fixing bolts are arranged on the end cover in an annular array distribution. The fixing bolts penetrate through the end cover and are thread - connected with the housing.

[0008] Preferably, the inner ring surface diameter of the end cover is the same as that of the inner ring hole of the sealing ring, and the hole center lines of the end cover and the sealing ring coincide.

[0009] Preferably, a trimming knife is arranged at the bottom of the valve plate, and a trimming groove for the trimming knife to be embedded is arranged inside the housing.

[0010] Preferably, a connecting seat is arranged on the sliding seat, and a driving assembly for driving the valve plate to move vertically is arranged on the connecting seat. The driving assembly includes a cylinder arranged on the connecting seat, a connecting block arranged on the valve plate, and a valve rod driving - connected with the cylinder. The end of the valve rod far from the cylinder is arranged on the connecting block.

[0011] Preferably, a vertically - distributed second sliding groove is arranged inside the sliding seat, and the valve plate is slidably arranged inside the second sliding groove.

[0012] Preferably, a fixing rod is arranged on the valve plate, and a first sliding groove for the fixing rod to slide vertically is arranged on the sliding seat.

[0013] Preferably, a second inductor and a first inductor are distributed up and down on the sliding seat. Both the first inductor and the second inductor are located on the side of the first sliding groove.

[0014] Compared with the prior art, the present utility model has the following beneficial technical effects:

[0015] 1. The present utility model can play a warning role in the sealing effect of the sealing ring through the arranged annular ring and groove. When the valve plate repeatedly rubs against the sealing ring, resulting in the wear of the end face of the sealing ring, the pre - tightening force provided by the annular ring makes the sealing ring slide along the groove and makes the sealing ring closely adhere to the valve plate, ensuring the sealing effect of the sealing ring and having good practicability.

[0016] 2. The side of the valve plate of the present utility model is always in fit with the second sliding groove on the sliding seat during the movement process, avoiding the drawback that the shaking generated during the lifting process of the valve plate affects the stability of the valve plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Structural schematic diagram of an embodiment of the present utility model;

[0018] Figure 2 Schematic cross-sectional structure diagram of the housing;

[0019] Figure 3 is Figure 2 Enlarged structural schematic diagram of part A in

[0020] Figure 4 Partial cross-sectional schematic diagram of the sliding seat.

[0021] Reference numerals: 1, housing; 2, sliding seat; 3, valve plate; 4, sealing ring; 5, end cover plate; 6, packing ring; 7, annular ring; 8, groove; 9, fixing bolt; 10, trimming knife; 11, connecting block; 12, fixing rod; 13, first inductor; 14, second inductor; 15, connecting seat; 16, cylinder; 17, valve rod; 18, first chute; 19, second chute. Detailed implementation manners

[0022] Embodiment 1

[0023] As Figures 1-4 shown, a wafer type knife gate valve proposed in this embodiment includes a housing 1 and a sealing assembly; a sliding seat 2 is arranged on the housing 1, and a valve plate 3 is slidably connected inside the sliding seat 2.

[0024] As Figure 2 and Figure 3 shown, the sealing assembly includes two sealing rings 4 distributed front and back inside the housing 1, a packing ring 6 arranged on the sealing ring 4, two end cover plates 5 respectively arranged outside the sealing ring 4, and an annular ring 7 arranged on the end cover plate 5. The annular ring 7 abuts against the sealing ring 4. A groove 8 is arranged between the housing 1 and the sealing ring 4. The sealing ring 4 fits against the valve plate 3, and the packing ring 6 abuts against the housing 1.

[0025] Six fixing bolts 9 are arranged on the end cover plate 5 in an annular array. The fixing bolts 9 penetrate through the end cover plate 5 and are threadedly connected to the housing 1. The inner ring surface diameter of the end cover plate 5 is the same as the inner ring hole diameter of the sealing ring 4, and the hole center lines of the end cover plate 5 and the sealing ring 4 coincide to ensure smooth flow of the object.

[0026] As Figure 3 shown, a trimming knife 10 is arranged at the bottom of the valve plate 3, and a cutting groove for the trimming knife 10 to be embedded is arranged inside the housing 1. The arrangement of the trimming knife 10 and the cutting groove can easily cut off the object and ensure the sealing performance of the knife gate valve.

[0027] In this embodiment, the sealing ring 4 and the packing ring 6 are provided to ensure the sealing performance of the knife gate valve when the valve plate 3 is closed. At the same time, the annular ring 7 is provided for early warning, and the groove 8 provided can allow the sealing ring 4 to slide a short distance. When the end face of the sealing ring 4 is worn due to the friction between the valve plate 3 and the sealing ring 4 for many times, the pre-tightening force provided by the annular ring 7 makes the sealing ring 4 slide along the groove 8 and makes the sealing ring 4 closely adhere to the valve plate 3, ensuring the sealing effect of the sealing ring 4 and having good practicability.

[0028] Embodiment Two

[0029] As Figure 1 and Figure 4 shown, a wafer type knife gate valve proposed in this embodiment, compared with Embodiment One, in this embodiment, a connecting seat 15 is provided on the sliding seat 2, and a driving assembly for driving the valve plate 3 to move vertically is provided on the connecting seat 15. The driving assembly includes a cylinder 16 provided on the connecting seat 15, a connecting block 11 provided on the valve plate 3, and a valve stem 17 drivingly connected to the cylinder 16. One end of the valve stem 17 away from the cylinder 16 is provided on the connecting block 11. A vertically distributed second chute 19 is provided inside the sliding seat 2, and the valve plate 3 is slidably arranged inside the second chute 19.

[0030] In this embodiment, when it is necessary to close the knife gate valve, when the cylinder 16 drives the valve stem 17 to move, the valve stem 17 drives the valve plate 3 to move through the connecting block 11. The bottom end of the valve plate 3 is embedded in the housing 1 to close the opening, and the side of the valve plate 3 is always in contact with the second chute 19 on the sliding seat 2 during the movement, avoiding the drawback that the shaking generated during the lifting of the valve plate 3 affects the stability of the valve plate 3. Moreover, during assembly, the valve plate 3 can be installed from the top of the sliding seat 2, having good practicability.

[0031] Embodiment Three

[0032] As Figure 4 shown, a wafer type knife gate valve proposed in this embodiment, compared with Embodiment Two, in this embodiment, a fixed rod 12 is provided on the valve plate 3, and a first chute 18 for the fixed rod 12 to slide vertically is provided on the sliding seat 2. Second sensors 14 and first sensors 13 are distributed up and down on the sliding seat 2, and both the first sensor 13 and the second sensor 14 are located on the side of the first chute 18.

[0033] In this embodiment, during the closing process of the knife gate valve, when the fixed rod 12 moves to the lowermost end, the first sensor 13 senses the fixed rod 12 and then sends a signal to an external controller (not shown), and the controller controls the cylinder 16 to stop forward driving; during the opening process of the knife gate valve, when the fixed rod 12 moves to the uppermost end, the second sensor 14 senses the fixed rod 12 and sends a signal to the external controller, and the controller controls the cylinder 16 to stop reverse driving.

[0034] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited thereto, and various changes can be made without departing from the spirit of the present utility model within the scope of knowledge possessed by those skilled in the relevant technical field.

Claims

1. A wafer-type knife gate valve, characterized in that: include: A housing (1) is provided with a sliding seat (2), and a valve plate (3) is slidably connected inside the sliding seat (2); A sealing assembly comprises two sealing rings (4) distributed front and rear inside a housing (1), a filling ring (6) arranged on the sealing ring (4), two end cover plates (5) respectively arranged outside the sealing ring (4), and an annular ring (7) arranged on the end cover plate (5), the annular ring (7) and the sealing ring (4) abut against each other, a groove (8) is arranged between the housing (1) and the sealing ring (4), the sealing ring (4) and the valve plate (3) are in contact with each other, and the filling ring (6) and the housing (1) abut against each other.

2. A wafer-type knife gate valve according to claim 1, characterized in that: The end cover plate (5) is provided with six fixing bolts (9) distributed in a circular array, and the fixing bolts (9) penetrate the end cover plate (5) and are threadedly connected to the housing (1).

3. A wafer-type knife gate valve according to claim 1, characterized in that: The inner annular surface of the end cover plate (5) has the same diameter as the inner annular surface of the sealing ring (4), and the center lines of the holes of the end cover plate (5) and the sealing ring (4) coincide with each other.

4. A wafer-type knife gate valve according to claim 1, characterized in that: A trimming knife (10) is arranged at the bottom of the valve plate (3), and a cutting groove for the trimming knife (10) to be embedded is arranged inside the housing (1).

5. The wafer-type knife gate valve according to claim 1, characterized in that: A connecting seat (15) is arranged on the sliding seat (2), and a driving assembly for driving the valve plate (3) to move vertically is arranged on the connecting seat (15), the driving assembly comprising a cylinder (16) arranged on the connecting seat (15), a connecting block (11) arranged on the valve plate (3), and a valve stem (17) drivingly connected to the cylinder (16), and an end of the valve stem (17) away from the cylinder (16) is arranged on the connecting block (11).

6. A wafer-type knife gate valve according to claim 5, characterized in that: A second sliding groove (19) distributed vertically is arranged inside the sliding seat (2), and the valve plate (3) is slidably arranged inside the second sliding groove (19).

7. The wafer-type knife gate valve according to claim 1, characterized in that: A fixing rod (12) is arranged on the valve plate (3), and a first sliding groove (18) for the fixing rod (12) to slide vertically is arranged on the sliding seat (2).

8. The wafer-type knife gate valve according to claim 7, characterized in that: The sliding seat (2) is provided with a second sensor (14) and a first sensor (13) which are distributed up and down, and the first sensor (13) and the second sensor (14) are both located on the side of the first sliding groove (18).

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