Parallel double gate valve

Abstract

The utility model discloses a parallel double gate plate gate valve, including valve body, valve cover, valve rod, gate plate and two valve seats, the valve cover is installed on the valve body upper end, the gate plate includes the gate plate frame and the gate plate body of the movable installation in the both sides of gate plate frame, and the multiple spring of the circular array distribution has between two gate plate bodies, the valve rod is through valve cover and stretches into the valve body with the linkage connection of gate plate frame, and two valve seats set up in the position of corresponding gate plate both sides in the valve body are used for when the valve is closed with the abutment of corresponding gate plate body and constitute sealing cooperation, and the outer circle of sandproof O -ring is tightly combined with the inner circle surface of gate plate frame, and is tightly combined with the inner circle surface of gate plate frame. The utility model not only can effectively protect spring, promote its service life, and the floating distance and limit position of gate plate body can be adjusted randomly according to the need of use, and the versatility is better, and it is more convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and more specifically to a parallel double gate valve. Background Technology

[0002] The parallel double-gate valve is a type of ceramic gate valve. Therefore, its structure and working principle are the same as a gate valve. Its opening and closing body (valve plate) is driven by the valve stem to move the valve seat sealing surface up and down, which can connect or disconnect the fluid passage. When the valve is partially open, eddies are generated on the back of the gate, which can easily cause erosion and vibration of the gate, and also easily damage the valve seat sealing surface, making repair difficult. It is generally suitable for operating conditions where frequent opening and closing is not required, and where the gate needs to be kept fully open or fully closed.

[0003] Utility model patent application CN201621124762.3 discloses a double-plate flat valve. This flat valve structure includes a gate frame, a set screw, a gate body, and cylindrical springs. The gate frame has a T-groove at its upper end and threaded holes on both sides, with set screws screwed into these holes. Gate bodies are connected to both the front and rear sides of the gate frame, and the two gate bodies are symmetrically arranged. Several countersunk holes are provided on the inner end face of the lower part of each gate body, and these countersunk holes are arranged opposite to each other. Several cylindrical springs are installed within these countersunk holes. A limiting groove is provided on the cylindrical surface where the gate body and gate frame mate. A gap is left between the head of the set screw and the upper limiting groove of the gate body, and the head of the set screw engages within the limiting groove on the gate body. This structure not only facilitates processing and installation, but the floating gate design also improves its sealing performance.

[0004] However, this structure still has the following drawbacks: (1) The column spring between the two gate bodies is prone to the adhesion of foreign objects such as sand and dust, which leads to increased friction between the spring coils or even jamming, reducing the service life of the column spring.

[0005] (2) The design of the limit groove being directly set on the gate frame makes the limit groove unadjustable. That is, the length of the gate body that can float and its limit position are fixed and cannot be flexibly adjusted according to the actual working conditions (the distance between the two valve seats is different due to different processing tolerance factors, different thickness of the valve seats themselves, etc.).

[0006] Therefore, it is necessary to improve the valve structure. Utility Model Content

[0007] The purpose of this utility model is to provide a parallel double gate valve. This utility model can not only effectively protect the spring and improve its service life, but also allow the floating distance and limit position of the gate body to be adjusted arbitrarily according to the needs of use, making it more versatile and more convenient to use.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a parallel double-gate valve, comprising a valve body, a valve cover, a valve stem, a gate, and two valve seats. The valve cover is installed on the upper end of the valve body. The gate includes a gate frame and gate bodies movably installed on both sides of the gate frame. Multiple springs are arranged in a circumferential array between the two gate bodies. The valve stem passes through the valve cover and extends into the valve body, where it is linked with the gate frame. The two valve seats are located on the corresponding sides of the gate body within the valve body, and are used to abut against the corresponding gate body to form a sealing fit when the valve is closed. Sand-proof O-rings are clamped between the inner end faces of the two gate bodies, and the outer circle of the sand-proof O-ring is tightly fitted with the inner circle of the gate frame.

[0009] By adopting the above solution and setting up sand-proof O-rings to surround multiple springs, a closed space can be formed between the two gate bodies, preventing hard particles such as sand and dust from entering the space and contacting the springs. This avoids increased friction or even jamming between the spring coils, maintains the stability of spring performance, and improves the service life of the springs.

[0010] The present invention is further provided with a positioning groove at the junction of the inner end of the gate body and the outer circle for embedding the sand-proof O-ring portion.

[0011] By adopting the above solution, the stability of the sand-proof O-ring installation structure can be improved.

[0012] The present invention is further configured such that a plurality of countersunk holes, the number of which is equivalent to the number of springs, are opened at the inner end of the gate body, and the two ends of the springs are respectively embedded in the countersunk holes of the corresponding gate body.

[0013] By adopting the above solution, the spring can be positioned, improving its stability during installation and movement, while also reducing the overall size of the gate.

[0014] The present invention is further configured such that the gate body includes a body and a sealing disc, and the sealing disc is connected to the end of the body by a plurality of set screws.

[0015] By adopting the above solution, the gate's split structure, namely the detachable design of the sealing disc used to cooperate with the valve seat, allows for the removal and replacement of the sealing disc when its sealing surface is severely worn, without the need to replace the entire gate, resulting in lower maintenance costs in the later stages.

[0016] The present invention is further configured such that a through hole is provided at the inner end of the countersunk hole for the set screw to pass through, a relief groove is provided between the through hole and the countersunk hole for the screw head of the set screw to be inserted, and a screw hole is provided at one end of the sealing disc near the body for the set screw to be screwed in, and the screw hole does not penetrate the sealing disc.

[0017] By adopting the above solution, the set screw is installed from the body toward the sealing disc and does not penetrate the sealing disc, thus not increasing the leakage point and not affecting the sealing performance. Furthermore, the clearance groove and through hole are both opened at the inner end of the countersunk hole, eliminating the need for additional positioning and facilitating processing and production.

[0018] The present invention is further configured such that a positioning protrusion is provided at the end of the main body near the sealing disc corresponding to the outer end of each through hole, and a positioning recess is provided at the end of the sealing disc near the main body corresponding to each screw hole, and the positioning protrusion and the corresponding positioning recess are fitted together.

[0019] By adopting the above scheme, the positioning structure is used to position the installation of the body and the sealing plate, so that the through hole on the body is aligned with the corresponding screw hole on the sealing plate, which facilitates the operation of the set screw.

[0020] The present invention is further configured such that an annular groove is formed on the outer circular surface of the gate plate, and two adjusting rings are threadedly connected to the annular groove, forming a limiting groove between the two adjusting rings. Multiple limiting screws are installed on the gate plate frame, and the inner end of the limiting screws extends into the limiting groove, with a gap between them.

[0021] By adopting the above scheme, the width and position of the limit groove can be adjusted by controlling the position of the two adjusting rings. As a result, the floating length of the gate body and its limit position can be flexibly adjusted according to the actual situation, which makes it more versatile and easier to use.

[0022] The present invention is further configured such that the outer circular surface of the adjusting ring is provided with a plurality of process grooves for inserting tools to perform the rotation operation of the adjusting ring.

[0023] By adopting the above scheme, since the adjusting ring is large in size and the thread friction between it and the gate body is also large, a rod-shaped tool is inserted into the process hole on the adjusting ring, and then a force is applied to the adjusting ring to make it rotate, which greatly facilitates the rotation operation of the adjusting ring.

[0024] The present invention is further configured such that the outer circular surface of the gate body is provided with a plurality of assembly holes for the insertion of pins on the gate installation auxiliary tools, and the outer end of the assembly holes is provided with a mandrel installation guide angle.

[0025] By adopting the above scheme, the operation of adjusting the position of the two gate bodies using the gate installation auxiliary tool is further facilitated. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the gate of this utility model; Figure 3 for Figure 2 A partially enlarged structural diagram; Figure 4 This is a front view of the gate of this utility model; Figure 5 This is a perspective view of the gate body of this utility model; Figure 6 This is an exploded view of the gate body of this utility model.

[0027] In the diagram: 1. Valve body; 2. Valve cover; 3. Valve stem; 4. Gate; 5. Valve seat; 6. Gate bracket; 7. Gate body; 8. Spring; 9. Sand-proof O-ring; 10. Positioning groove; 11. Countersunk hole; 12. Body; 13. Sealing disc; 14. Set screw; 15. Through hole; 16. Relief groove; 17. Screw hole; 18. Positioning protrusion; 19. Positioning recess; 20. Annular groove; 21. Adjusting ring; 22. Limiting groove; 23. Limiting screw; 24. Process groove; 25. Assembly hole; 26. Mandrel mounting guide angle. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example: As attached Figures 1-6 The parallel double gate valve shown includes a valve body 1, a valve cover 2, a valve stem 3, a gate 4, and two valve seats 5. The valve cover 2 is installed on the upper end of the valve body 1. The gate 4 includes a gate frame 6 and gate bodies 7 movably installed on both sides of the gate frame 6. Multiple springs 8 are distributed in a circumferential array between the two gate bodies 7. The valve stem 3 passes through the valve cover 2 and extends into the valve body 1, and is linked to the gate frame 6. The two valve seats 5 are located in the valve body 1 at positions corresponding to both sides of the gate 4, and are used to abut against the corresponding gate body 7 to form a sealing fit when the valve is closed. Sand-proof O-rings 9 are clamped between the inner end faces of the two gate bodies 7, and the outer circle of the sand-proof O-ring 9 is tightly fitted with the inner circle surface of the gate frame 6. The sand-proof O-ring 9 is set up to surround multiple springs 8, which can form a closed space between the two gate bodies 7. This prevents hard particles such as sand and dust from entering the space and contacting the springs 8, thereby avoiding increased friction or even jamming between the springs 8, maintaining the performance stability of the springs 8, and improving the service life of the springs 8.

[0030] As attached Figure 3As shown, a positioning groove 10 is provided at the junction of the inner end and the outer circle of the gate body 7 for the partial embedding of the sand-proof O-ring 9. This design can improve the stability of the sand-proof O-ring 9 installation structure.

[0031] As attached Figure 2 and attached Figure 3 As shown, the inner end of the gate body 7 has a plurality of countersunk holes 11, the number of which is equivalent to that of the springs 8. The two ends of the springs 8 are respectively embedded in the countersunk holes 11 of the gate body 7. This can position the springs 8, improve their stability during installation and movement, and also reduce the overall volume of the gate 4.

[0032] As attached Figure 2 and attached Figure 3 As shown, the gate body 7 includes a body 12 and a sealing disc 13. The sealing disc 13 is connected to the end of the body 12 by multiple set screws 14, which are hexagonal socket head cap screws. The split structure of the gate 4, that is, the detachable design of the sealing disc 13 for cooperating with the valve seat 5, allows for removal and replacement of the sealing disc 13 when the sealing surface is severely worn, without replacing the entire gate 4, resulting in lower maintenance costs in the later stages.

[0033] As attached Figure 3 As shown, the inner end of the countersunk hole 11 has a through hole 15 for the set screw 14 to pass through. A relief groove 16 is provided between the through hole 15 and the countersunk hole 11 for the screw head of the set screw 14 to be inserted. The diameters of the countersunk hole 11, the relief groove 16, and the through hole 15 decrease sequentially. The end of the sealing disc 13 near the body 12 has a screw hole 17 for the set screw 14 to be screwed in, and the screw hole 17 does not penetrate the sealing disc 13. The set screw 14 is installed from the body 12 toward the sealing disc 13, and does not penetrate the sealing disc 13, thus not increasing leakage points and not affecting the sealing performance. Furthermore, both the relief groove 16 and the through hole 15 are located inside the countersunk hole 11, requiring no additional positioning, which facilitates processing and production.

[0034] As attached Figure 3 As shown, a positioning protrusion 18 is provided at the end of the body 12 near the sealing disc 13, corresponding to the outer end of each through hole 15. A positioning recess 19 is provided at the end of the sealing disc 13 near the body 12, corresponding to each screw hole 17. The positioning protrusion 18 and the corresponding positioning recess 19 are engaged. The positioning structure positions the body 12 and the sealing disc 13, aligning the through holes 15 on the body 12 with the corresponding screw holes 17 on the sealing disc 13, facilitating the engagement of the set screw 14.

[0035] As attached Figure 3As shown, an annular groove 20 is formed on the outer circumference of the gate body 7. Two adjusting rings 21 are threadedly connected to the annular groove 20. The annular groove 20 has external threads on its circumference, and the adjusting rings 21 have internal threads on their inner circumference that match these external threads. A limiting groove 22 is formed between the two adjusting rings 21. Multiple limiting screws 23 are installed on the gate frame 6. The inner ends of the limiting screws 23 extend into the limiting groove 22, leaving a gap between them. The width of this gap determines the floating distance of the gate body 7. By controlling the position of the two adjusting rings 21, the width and position of the limiting groove 22 can be adjusted. Therefore, the floating length and extreme position of the gate body 7 can be flexibly adjusted according to actual conditions, resulting in better versatility and greater ease of use.

[0036] As attached Figure 3 As shown, the outer surface of the adjusting ring 21 is provided with multiple process grooves 24 for inserting tools to rotate the adjusting ring 21. Since the adjusting ring 21 is relatively large, the thread friction between it and the gate body 7 is also relatively large. Therefore, by inserting a rod-shaped tool into the process hole on the adjusting ring 21 and then applying force to the adjusting ring 21 to make it rotate, the rotation operation of the adjusting ring 21 is greatly facilitated.

[0037] As attached Figure 3 As shown, the outer circular surface of the gate body 7 has multiple assembly holes 25 for inserting pins on the gate installation auxiliary tool, and the outer end of each assembly hole 25 is provided with a spindle installation guide angle 26. The gate installation auxiliary tool is described in detail in patent application number CN201621124762.3; therefore, its specific structure will not be elaborated here. This design further facilitates the operation of the gate 4 installation auxiliary tool in adjusting the positions of the two gate bodies 7.

Claims

1. A parallel double-gate valve, comprising a valve body (1), a valve cover (2), a valve stem (3), a gate (4), and two valve seats (5), wherein the valve cover (2) is installed on the upper end of the valve body (1), the gate (4) comprises a gate frame (6) and gate bodies (7) movably installed on both sides of the gate frame (6), and a plurality of springs (8) are arranged in a circumferential array between the two gate bodies (7), the valve stem (3) penetrates the valve cover (2) and extends into the valve body (1) and is linked to the gate frame (6), and the two valve seats (5) are disposed in the valve body (1) at positions corresponding to both sides of the gate (4), for abutting against the corresponding gate body (7) to form a sealing fit when the valve is closed; characterized in that: A sand-proof O-ring (9) is clamped between the inner end faces of the two gate bodies (7), and the outer circle of the sand-proof O-ring (9) is in close contact with the inner circle of the gate frame (6).

2. The parallel double-gate valve according to claim 1, characterized in that: The inner end of the gate body (7) and the outer circle are provided with a positioning groove (10) for the sand-proof O-ring (9) to be partially embedded.

3. The parallel double-gate valve according to claim 1, characterized in that: The inner end of the gate body (7) is provided with a plurality of countersunk holes (11) of the same number as the spring (8), and the two ends of the spring (8) are respectively embedded in the countersunk holes (11) of the corresponding gate body (7).

4. A parallel double-gate valve according to claim 3, characterized in that: The gate body (7) includes a body (12) and a sealing disc (13), and the sealing disc (13) is connected to the end of the body (12) by a plurality of set screws (14).

5. A parallel double-gate valve according to claim 4, characterized in that: The inner end of the countersunk hole (11) is provided with a through hole (15) for the set screw (14) to pass through. A relief groove (16) for the screw head of the set screw (14) to be inserted is provided between the through hole (15) and the countersunk hole (11). The end of the sealing disc (13) near the body (12) is provided with a screw hole (17) for the set screw (14) to be screwed in, and the screw hole (17) does not penetrate the sealing disc (13).

6. A parallel double-gate valve according to claim 4, characterized in that: The body (12) near the sealing disc (13) is provided with a positioning protrusion (18) at the position of the outer end of each through hole (15), and the sealing disc (13) near the body (12) is provided with a positioning recess (19) at the position of each screw hole (17). The positioning protrusion (18) and the corresponding positioning recess (19) are matched.

7. A parallel double-gate valve according to claim 4, characterized in that: An annular groove (20) is provided on the outer circular surface of the gate body (7). Two adjusting rings (21) are threaded onto the annular groove (20). A limiting groove (22) is formed between the two adjusting rings (21). Multiple limiting screws (23) are installed on the gate frame (6). The inner end of the limiting screw (23) extends into the limiting groove (22), and there is a gap between them.

8. A parallel double-gate valve according to claim 7, characterized in that: The outer surface of the adjusting ring (21) is provided with a plurality of process grooves (24) for inserting tools to rotate the adjusting ring (21).

9. A parallel double-gate valve according to claim 1, characterized in that: The outer circular surface of the gate body (7) is provided with a plurality of assembly holes (25) for inserting pins on the gate installation auxiliary tool, and the outer end of the assembly hole (25) is provided with a spindle installation guide angle (26).

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