Multi-functional gate valve

Abstract

The utility model relates to a multi -functional gate stop valve, its characterized in that, the inlet channel and the outlet channel are formed on the gate, the outlet channel forms the mounting groove of upper end opening, the check valve clack passes through the mounting groove and is connected with the gate rotationally, the drive mechanism includes the support, operating assembly and guide block, the upper end of valve stem is connected with operating assembly threadedly, the lower end is inserted into the valve body and is connected with the gate rotationally, the lateral wall of valve stem forms the guide groove that cooperates with guide block, and the guide groove includes longitudinal portion and transverse portion, the lower end of valve stem forms the limit block corresponding with check valve clack, and the limit block has the locking position with check valve clack contact and lock check valve clack to make it close the inlet channel, and the unlocking position with check valve clack separation and check valve clack can swing freely. Its advantages are that: can realize the full opening, check, cut-off and other multiple states of valve in the limited pipeline length, can realize the check and cut-off function of valve, is not only simple structure, but also realizes multi -functional effect, and the practicality is strong.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and specifically to a multifunctional gate valve. Background Technology

[0002] Currently, it is very common for valves to be used in series in process pipeline shut-off devices in industries such as petrochemicals, for example, pump outlet check valves are connected in series with shut-off valves. The use of valves in series on pipelines not only significantly increases pipeline length and weight, but also poses a high safety hazard due to the long-term gravity and stress loads on the process pipelines. Furthermore, the increase in valves further increases the construction and operation / maintenance costs of the equipment.

[0003] For example, Chinese invention patent CN106678399B discloses a multifunctional gate valve, which combines a check valve and a gate valve to form a gate valve. When the valve is closed, the wedge gate moves downward and presses the check valve disc, thereby achieving the shut-off function. When the valve is open, the wedge gate moves upward and the check valve disc can swing freely. The opening and closing of the valve is automatically controlled by the medium pressure.

[0004] However, the aforementioned gate valve is not only complex in structure, but also can only achieve the effect of a check valve when the valve is opened, and cannot actively achieve the effect of fully opening the valve like a gate valve. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a multifunctional gate valve.

[0006] The technical solution adopted in this invention is: a multifunctional gate valve, comprising a valve body, a valve cover, and a valve seat, wherein the valve cover is installed on the upper end of the valve body, and the valve seat is disposed within the valve body;

[0007] Also includes:

[0008] A gate is installed in the valve body and can be sealed with the valve seat. The gate has an inlet channel and an outlet channel that are interconnected. The outlet channel has an installation groove with an opening at the top.

[0009] The check valve disc passes through the mounting groove and is rotatably connected to the gate. The upper end of the check valve disc is higher than the upper end face of the wedge-shaped gate, and the lower end of the check valve disc extends into the outlet channel.

[0010] The drive mechanism includes a bracket fixedly mounted on the valve cover, an operating component mounted on the top of the bracket, and a guide block mounted on the side wall of the bracket;

[0011] The valve stem has its upper end threadedly connected to the operating component and its lower end extending into the valve body and rotatably connected to the gate. The side wall of the valve stem has a guide groove that cooperates with the guide block. The guide groove includes a longitudinal part and a transverse part, and is in the shape of a "7". The lower end of the valve stem has a limiting block corresponding to the check valve disc. The limiting block has a locking position that contacts the check valve disc and locks the check valve disc to close the inlet channel, and an unlocking position that separates from the check valve disc and allows the check valve disc to swing freely.

[0012] The outlet end of the inlet channel is provided with a sealing protrusion, and the check valve disc can contact the sealing protrusion to seal and close the inlet channel.

[0013] A pressure block is fixedly installed at the upper end of the gate plate, the valve stem passes through the pressure block and rotates with the pressure block, and the limiting block is located below the pressure block and axially limits the pressure block.

[0014] The end of the limiting block that mates with the check valve disc is an arc-shaped surface.

[0015] The gate is wedge-shaped.

[0016] The beneficial effects of this invention are as follows: By adopting the above scheme, a medium channel is formed on the gate plate and a check valve disc is set. The limiting and guiding relationship between the guide groove and the guide block on the valve stem is used to realize the lifting and rotating action of the valve stem. The limiting block at the bottom of the valve stem is used to realize the locking and unlocking of the check valve disc. Thus, within a limited pipeline length, multiple states such as fully open, check valve, and shut-off valve can be realized. The valve can realize the check valve and shut-off functions. It is not only simple in structure, but also achieves multiple functions and is highly practical. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the multifunctional gate valve in the fully open state according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the structure of the multifunctional gate valve in the check valve state according to an embodiment of the present invention.

[0019] Figure 3 This is a partial structural diagram of the multifunctional gate valve in the check valve state according to an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of the multifunctional gate valve in the cut-off state according to an embodiment of the present invention.

[0021] Figure 5 This is a partial structural diagram of the multifunctional gate valve in the cut-off state according to an embodiment of the present invention.

[0022] Figure 6 for Figure 4 Enlarged diagram of point A in the middle. Detailed Implementation

[0023] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0024] As shown in the figure, a multifunctional gate valve includes a valve body 1, a valve cover 2, a valve seat 3, a gate 4, a check valve disc 5, a drive mechanism 6, and a valve stem 7.

[0025] The valve body 1 has a medium flow channel 11 and a middle cavity 12. The valve cover 2 is fixedly installed on the upper end of the valve body 1, and the valve seat 3 is disposed inside the valve body 1.

[0026] The gate 4 is disposed within the cavity 12 of the valve body 1 and can seal with the valve seat 3. The gate 4 is wedge-shaped, enabling a wedge-shaped seal with the valve seat 3, achieving a more reliable sealing effect.

[0027] The gate 4 also has an inlet channel 41 and an outlet channel 42 that are interconnected. The outlet channel 42 has an open mounting groove 43 at its upper end. The diameter of the outlet channel 42 is larger than that of the inlet channel 41, so that the outlet end of the inlet channel 41 forms an end face, and a sealing protrusion ring 44 is formed on the end face of the outlet end of the inlet channel 41.

[0028] The check valve disc 5 passes through the mounting groove 43 and is rotatably connected to the gate plate 4. The upper end of the check valve disc 5 is higher than the upper end face of the wedge-shaped gate plate 4, and the lower end of the check valve disc 5 extends into the outlet channel 42. The check valve disc 5 can contact the sealing convex ring 44 to seal and close the inlet channel 41.

[0029] The drive mechanism 6 includes a bracket 61 fixedly mounted on the valve cover 2, an operating component 62 mounted on the top of the bracket 61, and a guide block 63 mounted on the side wall of the bracket 61. The operating component 62 is manually operated by a handwheel, but can also be automatically operated by an actuator.

[0030] The upper end of the valve stem 7 is threadedly connected to the nut of the operating component 62, and the lower end extends into the valve body 1 and connects to the gate plate 4. A pressure block 45 is fixedly installed on the upper end of the gate plate 4, and a limiting block 72 is formed at the lower end of the valve stem 7. The valve stem 7 passes through the pressure block 45 and rotates with it. The limiting block 72 is located below the pressure block 45 and axially limits its movement. Therefore, the valve stem 7 and the gate plate 4 form a circumferentially rotating and axially limiting connection.

[0031] The valve stem 7 also has a guide groove 71 formed on its side wall to cooperate with the guide block 63. The guide groove 71 includes a longitudinal part 711 and a transverse part 712, and is in the shape of a "7". Under the limitation of the guide groove 71 and the guide block 63, the valve stem 7 can only perform lifting or rotating movements.

[0032] Furthermore, the limiting block 72 corresponds to the portion of the check valve disc 5 that protrudes above the gate plate 4. The limiting block 72 is elongated, and as the valve stem 7 rotates, it has a locked position where it contacts and locks the check valve disc 5, closing the inlet channel 41, and an unlocked position where it separates from the check valve disc 5 and allows it to swing freely. The two ends of the limiting block 72 along its length are arc-shaped surfaces, forming an arc-shaped guiding effect to ensure that the limiting block 72 can enter the locked position and contact the check valve disc 5.

[0033] The working principle of the above-mentioned multi-functional gate valve is as follows:

[0034] like Figure 1 As shown, the valve is in the open state, with the gate 4 and check valve disc 5 both located in the middle cavity 12 of the valve body 1. At this time, the medium flow channel 11 of the valve body 1 is unobstructed, and the valve is in the fully open state.

[0035] like Figure 2-3 As shown, the valve is in a check valve state. When the valve is closed, the valve stem 7 is circumferentially limited and cannot rotate due to the restriction of the longitudinal part 711 and the guide block 63. Therefore, rotating the handwheel, utilizing the threaded engagement between the upper end of the valve stem 7 and the operating component 62, can drive the valve stem 7 to move downward, thereby driving the gate 4 to move downward. When the valve stem 7 and the gate 4 move to the bottom, the transverse part 712 of the valve stem 7 corresponds to the guide block 63, and the gate 4 and the valve seat 3 fit tightly together to form a seal. At this time, the valve is in a check valve state, and the check valve disc 5 can swing freely. When the medium flows in the forward direction, after the medium enters the inlet channel 41 of the gate 4, it can push the check valve disc 5 to open the valve, allowing the medium to flow. When the medium flows in the reverse direction, after the medium enters the outlet channel 42 of the gate 4, the medium pressure will be used on the return valve disc 5, causing the return valve disc 5 to fit tightly with the sealing convex ring 44 to form a seal, thus closing the valve and preventing the medium from flowing back, achieving the check valve function.

[0036] like Figure 4-5 As shown, the valve is in the cut-off state. When the valve stem 7 and the gate 4 move downward to the bottom, they can no longer move downward. At this time, the horizontal part 712 of the valve stem 7 corresponds to the guide block 63. If the handwheel is rotated, the valve stem 7 can be rotated in the center. The rotation of the valve stem 7 can drive the limiting block 72 at its bottom to rotate synchronously. After rotating 90°, the length direction of the limiting block 72 turns to the check valve disc 5, that is, it moves from the unlocked position to the locked position, pressing against the check valve disc 5 and forcing the check valve disc 5 to maintain a tight seal with the sealing convex ring 44, thus realizing the cut-off function.

[0037] The aforementioned multi-functional gate valve forms a medium channel on the gate and is equipped with a check valve disc. By utilizing the limiting and guiding relationship between the guide groove and the guide block on the valve stem, the valve stem can be raised, lowered, and rotated. The check valve disc can be locked and unlocked by the limiting block at the bottom of the valve stem. Thus, within a limited pipeline length, the valve can achieve multiple states such as fully open, check valve, and shut-off. It can realize the check valve and shut-off functions, which is not only simple in structure but also multi-functional and highly practical.

[0038] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0040] Please note to all technical personnel: Although the present invention has been described according to the specific embodiments above, the inventive concept of the present invention is not limited to this invention. Any modifications that utilize the inventive concept will be included within the scope of protection of this patent.

Claims

1. A multifunctional gate valve, comprising a valve body (1), a valve cover (2), and a valve seat (3), wherein the valve cover (2) is installed on the upper end of the valve body (1), and the valve seat (3) is disposed inside the valve body (1); characterized in that Also includes: Gate (4), which is set inside the valve body (1) and can be sealed with the valve seat (3), and an inlet channel (41) and an outlet channel (42) that are interconnected are formed on the gate (4), and the outlet channel (42) has an installation groove (43) with an opening at the top. The check valve disc (5) passes through the mounting groove (43) and is rotatably connected to the gate (4). The upper end of the check valve disc (5) is higher than the upper end face of the wedge gate (4), and the lower end of the check valve disc (5) extends into the outlet channel (42). The drive mechanism (6) includes a bracket (61) fixedly mounted on the valve cover (2), an operating component (62) mounted on the top of the bracket (61), and a guide block (63) mounted on the side wall of the bracket (61). The valve stem (7) has its upper end threadedly connected to the operating component (62) and its lower end extending into the valve body (1) and rotatably connected to the gate (4). The side wall of the valve stem (7) forms a guide groove (71) that cooperates with the guide block (63). The guide groove (71) includes a longitudinal part (711) and a transverse part (712), and is in the shape of a "7". The lower end of the valve stem (7) forms a limiting block (72) corresponding to the check valve disc (5). The limiting block (72) has a locking position that contacts the check valve disc (5) and locks the check valve disc (5) to close the inlet channel (41), and an unlocking position that separates from the check valve disc (5) and allows the check valve disc (5) to swing freely.

2. The multifunctional gate valve according to claim 1, characterized in that, The outlet end of the inlet channel (41) is provided with a sealing ring (44), and the check valve disc (5) can contact the sealing ring (44) to seal and close the inlet channel (41).

3. The multifunctional gate valve according to claim 1, wherein A pressure block (45) is fixedly installed on the upper end of the gate (4). The valve stem (7) passes through the pressure block (45) and rotates with the pressure block (45). The limiting block (72) is located below the pressure block (45) and axially limits the pressure block (45).

4. The multi-functional gate valve according to claim 1, wherein The end of the limiting block (72) that mates with the check valve disc (5) is an arc-shaped surface.

5. The multifunctional gate valve according to claim 1, wherein The gate (4) is wedge-shaped.

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