Gate valve

Abstract

The utility model relates to the technical field of valves, in particular to a gate valve which comprises a valve body, a gate plate, a valve rod, a valve cover and an executing mechanism, a flow channel is arranged in the valve body, the gate plate is arranged in the valve body and used for communicating or blocking the flow channel, the valve cover is connected with the valve body, one end of the valve rod is connected with the gate plate, and the other end of the valve rod penetrates through the valve cover to be connected with the executing mechanism. A telescopic mechanism is further connected between the valve rod and the gate plate, the valve rod drives the gate plate to reciprocate through the telescopic mechanism, the telescopic mechanism and the valve rod are concentrically arranged, external threads are arranged on the outer wall of the valve rod, and the valve rod is in threaded fit with the telescopic mechanism through the external threads. According to the gate valve, the telescopic mechanism is installed between the valve rod and the gate plate, so that the length of the valve rod is shortened, normal opening and closing of the gate plate are not affected, good concentricity is guaranteed, and the gate plate is prevented from being damaged. And the sealing performance of the gate valve is improved, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field especially is involved in a gate valve. BACKGROUND

[0002] The gate valve is the most important one kind of valve at present, and it is widely used in the flow and cut-off of liquid, gas, dust and other media. The gate valve usually includes a valve body, the lower part of the valve body has an inlet and an outlet, and the left end of the inlet and the right end of the outlet both have sealing surfaces, a gate plate capable of moving up and down without rotating is arranged between the two sealing surfaces for dynamic sealing cooperation, the upper part of the gate plate is connected with a valve stem, the upper part of the valve stem is connected with an actuator, the valve stem is driven to rotate by the actuator, and then the gate plate moves up and down to form sealing or opening to the two sealing surfaces, and finally the inlet and the outlet are connected or cut off.

[0003] The gate valve of the prior art has the problem of poor concentricity due to the long valve stem, that is, the coincidence degree of the gate plate axis and the valve body axis is large, and the concentricity directly affects the sealing performance and service life, so a gate valve with good concentricity is needed. SUMMARY

[0004] The utility model discloses a gate valve, the utility model discloses a gate valve installs telescopic mechanism between valve stem and gate plate, shortens the length of valve stem, does not influence the normal opening and closing of gate plate, guarantees good concentricity, and then improves the sealing performance of gate valve and prolongs the service life.

[0005] The utility model discloses a technical scheme as follows: a gate valve, including valve body, gate plate, valve stem, valve cover and actuator, the valve body is equipped with flow channel, the gate plate sets up in the valve body for the intercommunication or the barrier of flow channel, the valve cover is connected with valve body, one end of valve stem is connected with gate plate and the other end penetrates valve cover and is connected with actuator, still be connected with telescopic mechanism between valve stem and gate plate, the valve stem drives gate plate reciprocating movement through telescopic mechanism, telescopic mechanism is concentric with valve stem, the outer wall of valve stem is equipped with outer thread, and valve stem is screwed with telescopic mechanism through outer thread, when actuator drives valve stem to rotate, telescopic mechanism reciprocating movement along the outer thread of valve stem.

[0006] Telescopic mechanism includes telescopic component and rotating component, valve stem, telescopic component and rotating component are concentric, telescopic component is sleeved on the outside of valve stem, rotating component sets up in telescopic component, and valve stem drives rotating component coaxial rotation.

[0007] The telescopic assembly comprises a fixed sleeve, a first telescopic sleeve and a connecting sleeve, the rotating assembly comprises a first rotating screw rod, the fixed sleeve is sleeved on the outer side of the valve rod, and the fixed sleeve is arranged in abutment between the actuator and the valve cover, the first telescopic sleeve is arranged in reciprocating sliding in the fixed sleeve in threaded cooperation with the outer thread of the valve rod, the first telescopic sleeve also drives the first rotating screw rod to reciprocate, the outer wall of the first rotating screw rod is provided with a first thread, and one end of the connecting sleeve is in threaded cooperation with the first thread of the first rotating screw rod and the other end is connected with the gate plate.

[0008] The telescopic assembly further comprises a second telescopic sleeve, and the rotating assembly further comprises a second rotating screw rod, the second telescopic sleeve is arranged in reciprocating sliding in the first telescopic sleeve in threaded cooperation with the first thread of the first rotating screw rod, the second telescopic sleeve also drives the second rotating screw rod to reciprocate, the outer wall of the second rotating screw rod is provided with a second thread, and the connecting sleeve is arranged in reciprocating sliding in the second telescopic sleeve in threaded cooperation with the second thread of the second rotating screw rod.

[0009] The rotating assembly is connected in relative rotation with the telescopic assembly through an annular connecting piece, and the telescopic assembly drives the rotating assembly to reciprocate along the outer thread.

[0010] The inner wall of the fixed sleeve is recessed in the axial direction and has a groove, and the first telescopic sleeve is inserted and matched with the groove through the protruding ridge of the outer wall.

[0011] The outer wall of the valve rod is recessed in the axial direction and has a limiting groove, and the first rotating screw rod is inserted and matched with the limiting groove through the limiting strip protruding from the inner wall.

[0012] The first telescopic sleeve comprises an end cover and a cylinder body, and the end cover is connected with the cylinder body through a pin shaft.

[0013] The beneficial effects of the utility model are as follows: the gate valve of the utility model installs the telescopic mechanism between the valve rod and the gate plate, the telescopic mechanism is in threaded cooperation with the outer thread of the valve rod, when the actuator drives the valve rod to rotate, the telescopic mechanism will drive the gate plate to reciprocate along the axial direction of the valve rod, compared with the gate valve of the prior art, the length of the valve rod is shortened, the normal opening and closing of the gate plate is not affected, the concentricity is ensured, and the sealing performance of the gate valve is improved and the service life is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings obtained according to these drawings without creative labor still belong to the scope of the utility model.

[0015] Figure 1 This is a schematic diagram of the structure of a gate valve according to the present invention;

[0016] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;

[0017] In the diagram, 1-valve body, 2-gate, 3-valve stem, 4-valve cover, 5-actuator, 6-flow channel, 7-external thread, 8-fixed sleeve, 9-first-stage telescopic sleeve, 10-connecting sleeve, 11-first-stage rotating screw, 12-first thread, 13-second-stage telescopic sleeve, 14-second-stage rotating screw, 15-second thread, 16-annular connector, 17-groove, 18-protrusion, 19-limiting groove, 20-limiting strip, 21-end cap, 22-cylinder, 23-pin, 24-telescopic assembly, 25-rotating assembly. Detailed Implementation

[0018] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0019] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0020] The directional and positional terms used in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0021] like Figures 1 to 2 As shown, this is an embodiment of the present invention. A gate valve includes a valve body 1, a gate 2, a valve stem 3, a valve cover 4, and an actuator 5. The valve body 1 has a flow channel 6. The gate 2 is disposed inside the valve body 1 to connect or block the flow channel 6. The valve cover 4 is connected to the valve body 1. One end of the valve stem 3 is connected to the gate 2, and the other end passes through the valve cover 4 and is connected to the actuator 5. A telescopic mechanism is also connected between the valve stem 3 and the gate 2. The valve stem 3 drives the gate 2 to move back and forth through the telescopic mechanism. The telescopic mechanism is concentrically arranged with the valve stem 3. The outer wall of the valve stem 3 has an external thread 7. The valve stem 3 is threaded with the telescopic mechanism through the external thread 7. When the actuator 5 drives the valve stem 3 to rotate, the telescopic mechanism moves back and forth along the external thread 7 of the valve stem 3.

[0022] The beneficial effects of such an arrangement are as follows: the gate valve of the utility model installs telescopic mechanism between valve stem and gate, and the telescopic mechanism is threadedly connected with the outer thread of the valve stem, and when the actuator drives the valve stem to rotate, the telescopic mechanism will drive the gate to reciprocate along the axial direction of the valve stem, compared with the gate valve of the prior art, the length of the valve stem is shortened, which does not affect the normal opening and closing of the gate, and ensures good concentricity, thereby improving the sealing performance of the gate valve and prolonging the service life.

[0023] Further arrangement, the telescopic mechanism includes telescopic assembly 24 and rotating assembly 25, the valve stem 3, telescopic assembly 24 and rotating assembly 25 are concentrically arranged, the telescopic assembly 24 is sleeved on the outer side of the valve stem 3, the rotating assembly 25 is arranged in the telescopic assembly 24, and the valve stem 3 drives the rotating assembly 25 to rotate coaxially.

[0024] The beneficial effects of such an arrangement are as follows: through the cooperation of the telescopic assembly and the rotating assembly, the effect of multi-stage telescoping is realized, a larger telescopic stroke is provided, and the telescopic assembly and the rotating assembly are concentrically arranged, and good concentricity is still maintained.

[0025] Further arrangement, the telescopic assembly 24 includes fixed sleeve 8, first telescopic sleeve 9 and connecting sleeve 10, the rotating assembly 25 includes first rotating lead screw 11, the fixed sleeve 8 is sleeved on the outer side of the valve stem 3, and the fixed sleeve 8 is abutted and arranged between the actuator 5 and the valve cover 4, the first telescopic sleeve 9 is reciprocally slidably arranged in the fixed sleeve 8 through the threadedly connected outer thread 7 of the valve stem 3, the first telescopic sleeve 9 also drives the first rotating lead screw 11 to reciprocally slide, the outer wall of the first rotating lead screw 11 is provided with first thread 12, and one end of the connecting sleeve 10 is threadedly connected with the first thread 12 of the first rotating lead screw 11 and the other end is connected with the gate 2.

[0026] The beneficial effects of such an arrangement are as follows: the fixed sleeve is installed between the actuator and the valve cover, which ensures the good stability of the telescopic mechanism as a whole, the fixed sleeve is penetrated by the valve stem, and also plays a guiding role for the valve stem, ensuring that the valve stem rotates along the axis, the first telescopic sleeve and the first rotating lead screw are installed in the fixed sleeve, the first telescopic sleeve is threadedly connected with the outer thread of the valve stem, the first telescopic sleeve drives the first rotating lead screw to reciprocate along the axial direction, and the other end of the first rotating lead screw is also connected with the gate through the connecting sleeve, that is, the valve stem is sequentially driven by the first telescopic sleeve, the first rotating lead screw and the connecting sleeve, and finally drives the gate to open and close, and the multi-stage transmission connection structure has stable transmission capacity.

[0027] Further, the telescopic assembly 24 further comprises a secondary telescopic sleeve 13, and the rotating assembly 25 further comprises a secondary rotating screw rod 14, the secondary telescopic sleeve 13 is arranged inside the primary telescopic sleeve 9 through screwing with the first screw thread 12 of the primary rotating screw rod 11, and the secondary telescopic sleeve 13 drives the secondary rotating screw rod 14 to reciprocate, the outer wall of the secondary rotating screw rod 14 is provided with a second screw thread 15, and the connecting sleeve 10 is arranged inside the secondary telescopic sleeve 13 through screwing with the second screw thread 15 of the secondary rotating screw rod 14.

[0028] The beneficial effects of such an arrangement are as follows: the secondary telescopic sleeve and the secondary rotating screw rod further increase the transmission level of the telescopic mechanism, further prolong the telescopic stroke, and are more suitable for gate valves that require a longer valve rod.

[0029] Further, the rotating assembly 25 is connected to the telescopic assembly 24 through the annular connecting piece 16, and the telescopic assembly 24 drives the rotating assembly 25 to reciprocate along the external screw thread 7.

[0030] The beneficial effects of such an arrangement are as follows: the telescopic assembly is connected to the rotating assembly through the annular connecting piece, which does not affect the rotation of the rotating assembly itself and can drive the rotating assembly to reciprocate along the axial direction of the valve rod, and the primary telescopic sleeve and the primary rotating screw rod and the secondary telescopic sleeve and the secondary rotating screw rod are all connected through the annular connecting piece.

[0031] Further, the inner wall of the fixed sleeve 8 is recessed in the axial direction to form a groove 17, and the primary telescopic sleeve 9 is inserted and matched with the groove 17 through the protruding ridge 18 on the outer wall.

[0032] The beneficial effects of such an arrangement are as follows: the primary telescopic sleeve is rotationally limited through the insertion and matching of the groove and the ridge, which prevents the primary telescopic sleeve from rotating and enables the primary telescopic sleeve to reciprocate along the axial direction of the valve rod, and the secondary telescopic sleeve and the primary telescopic sleeve and the connecting sleeve and the secondary telescopic sleeve are all inserted and matched through the groove and the ridge.

[0033] Further, the outer wall of the valve rod 3 is recessed in the axial direction to form a limiting groove 19, and the primary rotating screw rod 11 is inserted and matched with the limiting groove 19 through the limiting strip 20 protruding on the inner wall.

[0034] The beneficial effects of such an arrangement are as follows: the valve rod can drive the primary rotating screw rod to rotate synchronously and concentrically through the insertion and matching of the limiting groove and the limiting strip, and the secondary rotating screw rod and the primary rotating screw rod also adopt the insertion and matching structure of the limiting groove and the limiting strip.

[0035] Further, the primary telescopic sleeve 9 comprises an end cover 21 and a cylinder body 22, and the end cover 21 is connected to the cylinder body 22 through a pin shaft 23.

[0036] The beneficial effects of such arrangement are as follows: the first telescopic sleeve is of split structure, the end cover and the cylinder are connected and combined together through the pin shaft, and has the advantages of convenient disassembly and assembly and convenient maintenance.

[0037] The above disclosed is only the preferred embodiment of the utility model, of course, cannot limit the scope of the utility model right with this, therefore, the equivalent change made according to the utility model right claim still belongs to the range covered by the utility model.

Claims

1. A gate valve comprising a valve body (1), a gate plate (2), a valve stem (3), a valve cover (4) and an actuator (5), a flow passage (6) is provided in the valve body (1), the gate plate (2) is arranged in the valve body (1) for connecting or blocking the flow passage (6), the valve cover (4) is connected with the valve body (1), one end of the valve stem (3) is connected with the gate plate (2) and the other end penetrates through the valve cover (4) and is connected with the actuator (5), characterized in that: The valve rod (3) and the gate (2) are also connected with a telescopic mechanism, the valve rod (3) drives the gate (2) to reciprocate through the telescopic mechanism, the telescopic mechanism is concentrically arranged with the valve rod (3), the outer wall of the valve rod (3) is provided with external threads (7), the valve rod (3) is threadedly connected with the telescopic mechanism through the external threads (7), and when the actuator (5) drives the valve rod (3) to rotate, the telescopic mechanism reciprocates along the external threads (7) of the valve rod (3). ​ 2. A gate valve according to claim 1, characterized in that: The telescopic mechanism comprises a telescopic assembly (24) and a rotating assembly (25), the valve rod (3), the telescopic assembly (24) and the rotating assembly (25) are concentrically arranged, the telescopic assembly (24) is sleeved on the outer side of the valve rod (3), and the rotating assembly (25) is arranged in the telescopic assembly (24).

3. A gate valve according to claim 2, wherein: The telescopic assembly (24) comprises a fixed sleeve (8), a first telescopic sleeve (9) and a connecting sleeve (10), the rotating assembly (25) comprises a first rotating lead screw (11), the fixed sleeve (8) is sleeved on the outer side of the valve rod (3), and the fixed sleeve (8) is abutted and arranged between the actuator (5) and the valve cover (4), the first telescopic sleeve (9) is reciprocatingly and slidably arranged in the fixed sleeve (8) through threadedly connecting with the external threads (7) of the valve rod (3), the first telescopic sleeve (9) also drives the first rotating lead screw (11) to reciprocate, the outer wall of the first rotating lead screw (11) is provided with first threads (12), one end of the connecting sleeve (10) is threadedly connected with the first threads (12) of the first rotating lead screw (11), and the other end of the connecting sleeve (10) is connected with the gate (2).

4. A gate valve according to claim 3, wherein: The telescopic assembly (24) further comprises a second telescopic sleeve (13), and the rotating assembly (25) further comprises a second rotating lead screw (14), the second telescopic sleeve (13) is reciprocatingly and slidably arranged in the first telescopic sleeve (9) through threadedly connecting with the first threads (12) of the first rotating lead screw (11), the second telescopic sleeve (13) also drives the second rotating lead screw (14) to reciprocate, the outer wall of the second rotating lead screw (14) is provided with second threads (15), and the connecting sleeve (10) is reciprocatingly and slidably arranged in the second telescopic sleeve (13) through threadedly connecting with the second threads (15) of the second rotating lead screw (14).

5. A gate valve according to claim 2, wherein: The rotating assembly (25) is relatively rotatably connected with the telescopic assembly (24) through an annular connecting piece (16), and the telescopic assembly (24) drives the rotating assembly (25) to reciprocate along the external threads (7).

6. A gate valve according to claim 3, wherein: The inner wall of the fixed sleeve (8) is recessed in an axial direction and has a groove (17), and the first telescopic sleeve (9) is inserted and connected with the groove (17) through a convex strip (18) protruding from the outer wall.

7. A gate valve according to claim 3, wherein: The outer wall of the valve rod (3) is recessed in an axial direction and has a limiting groove (19), and the first rotating lead screw (11) is inserted and connected with the limiting groove (19) through a limiting strip (20) protruding from the inner wall.

8. A gate valve according to claim 3, wherein: The primary telescopic sleeve (9) comprises an end cover (21) and a barrel (22), and the end cover (21) is connected with the barrel (22) through a pin shaft (23).

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