Double-seal power station valve

Abstract

The utility model discloses a double-seal power station valve which comprises a valve body, the lower end of the valve body is connected with a runner pipe, the upper end of the valve body is connected with an end cover through a bolt, a valve rod is rotationally connected in the end cover through a rotating bearing, a lead screw is fixed in the middle of the interior of the valve body, guide rods connected with the valve body are arranged on the two sides of the lead screw, and an inner spline is arranged on the bottom face of the valve rod. The upper end of the lead screw is connected into the internal spline through the external spline, a positioning groove is formed in the bottom face of the end cover, the upper ends of the guide rods are inserted into the positioning groove, the lead screw is in threaded connection with a threaded sleeve, the threaded sleeve is in sliding connection with the two guide rods, the two ends of the threaded sleeve are connected with valve plates, two valve holes are formed in the circulation pipe, and the two valve plates are arranged in the two valve holes in a sliding mode respectively. And a sealing groove matched with the valve plate is formed in the bottom in the runner pipe. Double sealing is achieved through the two valve plates, when any valve plate is damaged, media cannot circulate, and good blocking and sealing effects are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of power station valves, in particular to a double-sealed power station valve. Background Technique

[0002] Power station gate valves, also known as special valves for power stations, are mainly applicable to pipelines of various systems in thermal power stations to cut off or connect pipeline media. The characteristics of power station valves compared with other valve products are high temperature and high pressure, and a unique self-sealing design. The higher the pressure, the more reliable the seal.

[0003] After retrieval, it is found that the Chinese utility model patent with the authorization publication number of CN212028584U discloses a self-sealing power station valve. From its specification, it can be known that by inserting the valve plate into the fixed groove, the valve body can be closed.

[0004] However, the valves in the above patent and most current valves have the following problems: there is a valve plate in the valve body. If the valve plate is damaged, the flow of the medium cannot be blocked. Content of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model provides a double-sealed power station valve to solve the problems mentioned in the above background technique.

[0006] To solve the above technical problems, the utility model provides the following technical solutions:

[0007] A double-sealed power station valve includes a valve body. A flow pipe is connected to the lower end of the valve body. An end cover is connected to the upper end of the valve body by bolts. A valve rod is rotatably connected in the end cover through a rotary bearing. A lead screw is fixed in the middle of the valve body. Guide rods connected to the valve body are arranged on both sides of the lead screw. An internal spline is provided on the bottom surface of the valve rod. The upper end of the lead screw is connected to the internal spline through an external spline. A positioning groove is provided on the bottom surface of the end cover. The upper ends of the guide rods are inserted into the positioning groove. A nut sleeve is threadedly connected to the lead screw. The nut sleeve is slidably connected to the two guide rods. Valve plates are connected to both ends of the nut sleeve. Two valve holes are opened on the flow pipe. The two valve plates are respectively slidably arranged in the two valve holes. A sealing groove matching the valve plate is provided at the bottom of the flow pipe.

[0008] Preferably, handles extending upward are connected to both sides of the end cover. A sleeve is connected to the two handles. The valve rod is rotatably arranged in the sleeve. A handwheel is connected to the upper end of the valve rod.

[0009] Preferably, a sealing sleeve is provided on the inner wall of the valve hole.

[0010] Preferably, the sealing groove is stepped, the lower end of the valve plate is also stepped, and a sealing gasket is embedded in the sealing groove.

[0011] Preferably, flanges are connected to both ends of the flow pipe.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] By arranging two valve plates in the valve body, rotating the valve stem to drive the screw rod to rotate, during the rotation of the screw rod, the nut sleeve is driven to move downward along the guide rod, so that the valve plate enters the flow pipe from the valve hole and is inserted into the sealing groove, thereby realizing double sealing. When any one of the valve plates is damaged, the medium cannot flow, achieving a good blocking and sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the utility model;

[0015] Figure 2 is Figure 1 an enlarged view of part A of

[0016] Figure 3 is Figure 1 an enlarged view of part B of

[0017] In the figure: 1-valve body, 2-flow pipe, 3-end cover, 4-valve stem, 5-screw rod, 6-guide rod, 7-nut sleeve, 8-valve plate, 9-valve hole, 10-sealing groove, 11-handle, 12-sleeve, 13-handwheel, 14-sealing sleeve, 15-sealing gasket, 16-flange. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0019] Embodiment 1

[0020] Please refer to Figures 1-3 , a double-sealing power station valve, including a valve body 1, a flow pipe 2 is connected to the lower end of the valve body 1, an end cover 3 is connected to the upper end of the valve body 1 by bolts, a valve stem 4 is rotatably connected in the end cover 3 through a rotary bearing, a screw rod 5 is fixed in the middle of the valve body 1, guide rods 6 connected to the valve body are arranged on both sides of the screw rod 5, an internal spline is provided on the bottom surface of the valve stem 4, the upper end of the screw rod 5 is connected to the internal spline through an external spline, a positioning groove is provided on the bottom surface of the end cover 3, the upper end of the guide rod 6 is inserted into the positioning groove, a nut sleeve 7 is threadedly connected to the screw rod 5, the nut sleeve 7 is slidably connected to the two guide rods 6, both ends of the nut sleeve 7 are connected with valve plates 8, two valve holes 9 are opened on the flow pipe 2, and the two valve plates 8 are respectively slidably arranged in the two valve holes 9, and a sealing groove 10 matching the valve plate 8 is provided at the bottom of the flow pipe 2.

[0021] On both sides of the end cover 3, there are handles 11 extending upward. A sleeve 12 is connected to the two handles 11. The valve stem 4 is rotatably arranged in the sleeve 12, and the upper end of the valve stem 4 is connected to a handwheel 13.

[0022] By arranging two valve plates 8 in the valve body, rotating the handwheel 13 drives the valve stem 4 to rotate. The valve stem 4 drives the lead screw 5 to rotate. During the rotation of the lead screw 5, the nut sleeve 7 is driven to move downward along the guide rod 6, so that the valve plate 8 enters the flow pipe 2 from the valve hole 9 and is inserted into the sealing groove 10, thereby realizing double sealing. When any one of the valve plates 8 is damaged, the medium cannot flow through, achieving a good blocking and sealing effect.

[0023] When installing the valve plate, first install the nut sleeve on the lead screw and the guide rod, then align the internal spline on the valve stem with the external spline on the lead screw, and at the same time align the positioning groove on the end cover with the guide rod. Then install the end cover on the valve body so that the lead screw is spline-connected to the valve stem, and at the same time the guide rod is inserted into the positioning groove. Finally, tighten the bolts to fix the end cover on the valve body. When it is necessary to replace or repair the valve plate, remove the end cover and take out the nut sleeve from the lead screw and the guide rod.

[0024] A sealing sleeve 14 is provided on the inner wall of the valve hole 9. By providing the sealing sleeve, the medium can be prevented from entering the valve body. The sealing groove 10 is in a stepped shape, and the lower end of the valve plate is also in a stepped shape. A sealing gasket 15 is embedded in the sealing groove 10. Through the stepped sealing groove and the stepped shape of the lower end of the valve plate, when the valve plate is inserted into the sealing groove and then combined with the sealing gasket 15, the sealing performance can be further improved.

[0025] Embodiment 2

[0026] The difference between this embodiment and Embodiment 1 is that flanges 16 are connected to both ends of the flow pipe 2. Through the flanges 16, the present utility model can be connected to a pipeline.

[0027] It should be noted that the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0028] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A double-seal power station valve, characterized in that: The valve body (1) comprises a valve body (1), the lower end of the valve body (1) is connected to a flow pipe (2), the upper end of the valve body (1) is connected to an end cover (3) by means of bolts, a valve stem (4) is rotatably connected to the end cover (3) by means of a rotary bearing, a screw rod (5) is fixed to the middle of the valve body (1), guide rods (6) connected to the valve body are arranged on both sides of the screw rod (5), an internal spline is arranged on the bottom surface of the valve stem (4), the upper end of the screw rod (5) is connected to the internal spline by means of an external spline, and the end cover (3) is rotatably connected to a valve stem (4) by means of a rotary bearing. The bottom surface of the cover (3) is provided with a positioning groove, the upper end of the guide rod (6) is inserted into the positioning groove, the screw rod (5) is threadedly connected with a screw sleeve (7), the screw sleeve (7) is slidably connected to the two guide rods (6), the two ends of the screw sleeve (7) are connected to a valve plate (8), the flow pipe (2) is provided with two valve holes (9), the two valve plates (8) are respectively slidably arranged in the two valve holes (9), and the bottom of the flow pipe (2) is provided with a sealing groove (10) matching the valve plate (8).

2. A double-seal power station valve according to claim 1, characterized in that: The two sides of the end cover (3) are connected with handles (11) extending upwards, the two handles (11) are connected with sleeves (12), the valve stem (4) is rotatably arranged in the sleeves (12), and the upper end of the valve stem (4) is connected with a hand wheel (13).

3. A double-seal power station valve according to claim 2, characterized in that: The inner wall of the valve hole (9) is provided with a sealing sleeve (14).

4. A double-seal power station valve according to claim 3, characterized in that: The sealing groove (10) is in a stepped shape, the lower end of the valve plate is also in a stepped shape, and a sealing gasket (15) is embedded in the sealing groove (10).

5. A double-seal power station valve according to any one of claims 1 to 4, characterized in that: Both ends of the flow pipe (2) are connected with flanges (16).

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