High sealing parallel gate valve for nuclear power plant

Abstract

The utility model discloses a high sealing parallel gate valve for nuclear power station, including valve body, valve cover, hand wheel and locking device, the utility model discloses a locking device is set up on the surface of hand wheel, when needing to lock hand wheel, first adjust the angle of connecting sleeve and support, make the limiting column just for the clamping groove, then push back the telescopic support inside the slide cavity, until the fastener is inserted into the fastening groove from the slide cavity and is buckled, thereby the telescopic support is buckled and is fixed in the connecting sleeve inside, the limiting column will be buckled in the inside of clamping groove in this process, thereby the hand wheel is caught and is locked in the current angle, can avoid the hand wheel to appear the slight motion deflection of external factor and lead to the valve plate angle change unable to be strict, guarantee the sealing performance of valve body, through the locking mark that has been sprayed on the top surface edge of hand wheel, when the hand wheel is in the complete locking state, the locking mark and the limiting column position just correspond, and the locking mark can help the user to detect whether the hand wheel is completely locked, avoids the operation mistake and leads to the valve not to be closed tightly.

Description

Technical Field

[0001] This utility model relates to the field of parallel gate valve technology, specifically a high-sealing parallel gate valve for nuclear power plants. Background Technology

[0002] Nuclear power plants mostly use parallel gate valves as pipeline valves. Parallel gate valves are a type of gate valve whose sealing surface is perpendicular to the pipeline axis. When in use, the valve stem drives the valve plate to move up and down, and the fluid is cut off or connected through the contact of the sealing surface. It has the advantages of low fluid resistance and unrestricted medium flow direction.

[0003] Existing patent application number: 201922085889.9 An improved parallel gate valve includes a valve body, a valve cover, a valve seat, a valve stem, and a valve plate assembly. The valve cover is installed on the top of the valve body using a first bolt. The upper part of the valve body has an upper chamber, and the lower part of the valve body has a flow channel for medium flow. The valve seat is disposed in the flow channel and has a valve plate groove that mates with the valve plate assembly. The valve plate assembly is installed in the valve plate groove. The valve stem passes through the upper chamber from the valve cover and is sealed to the valve cover using a sealing structure. The lower end of the valve stem is connected to the upper part of the valve plate assembly.

[0004] The aforementioned patent describes the structural principle of a parallel gate valve. In practical applications, gate valves are mostly opened and closed using a handwheel drive. However, the drive mechanism lacks a locking mechanism, making it difficult to securely lock the handwheel at the current angle. External factors can easily cause the drive mechanism to deflect slightly, resulting in changes in the valve plate angle and preventing a tight seal at the valve port, thus affecting the gate valve's sealing performance. Therefore, we propose a high-sealing parallel gate valve for nuclear power plants to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a high-sealing parallel gate valve for nuclear power plants to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a high-sealing parallel gate valve for nuclear power plants, comprising a valve body, a valve cover, a handwheel, and a locking device. The valve cover is mounted on the top flange of the valve body, and a handwheel is rotatably mounted on the top of the valve cover. A locking device is provided on the surface of the handwheel. The locking device includes a support, a connecting sleeve, a sliding cavity, a telescopic frame, a limiting post, and a slot. The support is fitted onto the upper end of the valve cover, and a connecting sleeve is hinged to the side of the support. A sliding cavity is opened at the end of the connecting sleeve, and a telescopic frame is slidably mounted inside the sliding cavity. A limiting post is installed at the top of the end of the telescopic frame. The limiting post is at the same horizontal height as the handwheel. Slots are evenly distributed around the outer side of the handwheel, and the limiting post can be movably engaged with the inner side of the slot.

[0007] Preferably, the rotatable angle between the connecting sleeve and the support is 10-30°.

[0008] Preferably, the slot is arc-shaped and the end of the slot is chamfered.

[0009] Preferably, fasteners are integrally provided on both the front and rear sides of the telescopic frame end, and fastening grooves are provided on both the front and rear sides of the connecting sleeve end. The fastening grooves are connected to the inside of the sliding cavity, and the fasteners can be fastened and inserted into the fastening grooves from inside the sliding cavity.

[0010] Preferably, a spring is installed on the inner wall of the sliding cavity, and the end of the spring is connected and fixed to the telescopic frame.

[0011] Preferably, a locking mark is printed on the top edge of the handwheel, and when the handwheel is in the fully locked state, the locking mark corresponds to the position of the limit post.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This invention features a locking device on the surface of the handwheel. When locking the handwheel, first adjust the angle between the connecting sleeve and the support so that the limiting post is aligned with the slot. Then, push the telescopic frame back into the slide cavity until the fastener engages with the slot from inside the slide cavity, thus securing the telescopic frame inside the connecting sleeve. During this process, the limiting post engages with the inside of the slot, locking the handwheel at the current angle. This locking of the handwheel angle prevents the handwheel from being slightly deflected by external factors, which could cause the valve plate angle to change and prevent a tight seal, thus ensuring the sealing performance of the valve body.

[0013] This invention features a locking mark printed on the top edge of the handwheel. When the handwheel is fully locked, the locking mark corresponds to the position of the limit post. The locking mark helps the user check whether the handwheel is fully locked, thus preventing operational errors that could lead to the valve not closing tightly. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall front view of the present invention.

[0015] Figure 2 This is a front view schematic diagram of the valve cover in this utility model.

[0016] Figure 3 This is a top view of the handwheel structure in this utility model.

[0017] Figure 4 This is a top view cross-sectional structural diagram of the connecting sleeve in this utility model.

[0018] Figure 5 This utility model Figure 4 A schematic diagram of the structure in its contracted state.

[0019] In the diagram: Valve body-1, Valve cover-2, Handwheel-3, Locking device-4, Support-41, Connecting sleeve-42, Slide cavity-43, Telescopic frame-44, Limiting post-45, Slot-46, Fastener-47, Fastener groove-48, Spring-49, Locking mark-410. Detailed Implementation

[0020] To further explain the technical solution of this utility model, a detailed description is provided below through specific embodiments.

[0021] Please see Figure 1 This utility model provides a high-sealing parallel gate valve for nuclear power plants, including a valve body 1, a valve cover 2, a handwheel 3 and a locking device 4. The valve cover 2 is installed on the top flange of the valve body 1, and the handwheel 3 is rotatably installed on the top of the valve cover 2. The locking device 4 is provided on the surface of the handwheel 3.

[0022] Please see Figure 2 , Figure 3 and Figure 5 This utility model provides a high-sealing parallel gate valve for nuclear power plants. The locking device 4 includes a support 41, a connecting sleeve 42, a sliding cavity 43, a telescopic frame 44, a limiting post 45, and a slot 46. The support 41 is sleeved on the upper end of the valve cover 2, and the connecting sleeve 42 is hinged to the side of the support 41. The rotatable angle between the connecting sleeve 42 and the support 41 is 10-30° to better adjust the relative position of the limiting post 45 and the slot 46, ensuring that the limiting post 45 can be tightly engaged in the inner side of the slot 46. The connecting sleeve 42 has a sliding cavity 43 at its end, and the telescopic frame 44 is slidably installed inside the sliding cavity 43. The limiting post 45 is installed at the top of the end of the telescopic frame 44. The limiting post 45 is at the same horizontal height as the handwheel 3. The slots 46 are evenly distributed around the outer side of the handwheel 3. The limiting post 45 can be movably engaged with the inner side of the slot 46, thereby locking the handwheel 3 at the current angle.

[0023] To further explain, the slot 46 is arc-shaped and the end of the slot 46 is chamfered to ensure that the slot 46 will not affect the grip of the handwheel 3. In addition, the concave and convex structure of the slot 46 can provide anti-slip function for the handwheel 3, making it less likely to slip out of the hand during operation.

[0024] Please see Figure 4This utility model provides a high-sealing parallel gate valve for nuclear power plants. The telescopic frame 44 has fasteners 47 integrally provided on both the front and rear sides of its end. The connecting sleeve 42 has fastening grooves 48 on both the front and rear sides of its end. The fastening grooves 48 are connected to the inside of the sliding cavity 43. The fasteners 47 can be inserted into the fastening grooves 48 from inside the sliding cavity 43, thereby fastening and fixing the telescopic frame 44 inside the connecting sleeve 42. The inner wall of the sliding cavity 43 is equipped with a spring 49. The end of the spring 49 is connected and fixed to the telescopic frame 44. After the connection between the fasteners 47 and the fastening grooves 48 is released, the telescopic frame 44 will pop out automatically under the elastic action of the spring 49, making the unlocking operation convenient and quick.

[0025] In this utility model, a locking mark 410 is printed on the top edge of the handwheel 3. When the handwheel 3 is in the fully locked state, the locking mark 410 corresponds to the position of the limit post 45. The locking mark 410 can help the user check whether the handwheel 3 is fully locked and avoid operational errors that cause the valve to not close tightly.

[0026] Specifically, by setting a locking device 4 on the surface of the handwheel 3, when it is necessary to unlock the handwheel 3, first press the fastener 47 back from the slot 48 into the slide cavity 43, so that the fastener 47 is disconnected from the slot 48. At this time, the telescopic frame 44 pops out of the slide cavity 43 under the elastic action of the spring 49, thereby driving the limit post 45 to leave the inside of the slot 46, so as to release the rotation restriction of the handwheel 3, and thus control the handwheel 3 to perform opening and closing actions. When it is necessary to lock the handwheel 3, first adjust the angle between the connecting sleeve 42 and the support 41 so that the limiting post 45 is aligned with the slot 46. Then push the telescopic frame 44 back into the slide cavity 43 until the fastener 47 engages with the slot 48 from inside the slide cavity 43, thereby fastening and fixing the telescopic frame 44 inside the connecting sleeve 42. During this process, the limiting post 45 will engage with the inside of the slot 46, thereby locking the handwheel 3 at the current angle and locking the angle of the handwheel 3. This can prevent the handwheel 3 from being slightly deflected by external factors, which would cause the valve plate angle to change and not be able to seal tightly, thus ensuring the sealing performance of the valve body 1.

[0027] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-sealing parallel gate valve for nuclear power plants, comprising a valve body (1), a valve cover (2) and a handwheel (3), wherein the valve cover (2) is mounted on the top flange of the valve body (1), and the handwheel (3) is rotatably mounted on the top of the valve cover (2). Its features are: It also includes a locking device (4), the handwheel (3) is provided with a locking device (4), the locking device (4) includes a support (41), a connecting sleeve (42), a sliding cavity (43), a telescopic frame (44), a limiting post (45) and a slot (46), the upper end of the valve cover (2) is fitted with a support (41), the side of the support (41) is hinged with a connecting sleeve (42), the end of the connecting sleeve (42) is provided with a sliding cavity (43), the sliding cavity (44) is slidably installed inside the sliding cavity (43), the top of the end of the telescopic frame (44) is installed with a limiting post (45), the limiting post (45) is at the same horizontal height as the handwheel (3), the outer side of the handwheel (3) is provided with slots (46) distributed at equal intervals, the limiting post (45) can be movably fitted with the inner side of the slot (46).

2. The high-sealing parallel gate valve for nuclear power plants according to claim 1, characterized in that: The rotatable angle between the connecting sleeve (42) and the support (41) is 10-30°.

3. The high-sealing parallel gate valve for nuclear power plants according to claim 1, characterized in that: The slot (46) is arc-shaped, and the end of the slot (46) is chamfered.

4. The high-sealing parallel gate valve for nuclear power plants according to claim 1, characterized in that: The telescopic frame (44) has fasteners (47) integrally provided on the front and rear sides of the end, and the connecting sleeve (42) has fastening grooves (48) on the front and rear sides of the end. The fastening grooves (48) are connected to the inside of the sliding cavity (43), and the fasteners (47) can be fastened and inserted into the fastening grooves (48) from the inside of the sliding cavity (43).

5. The high-sealing parallel gate valve for nuclear power plants according to claim 1, characterized in that: A spring (49) is installed on the inner wall of the sliding cavity (43), and the end of the spring (49) is connected and fixed to the telescopic frame (44).

6. The high-sealing parallel gate valve for nuclear power plants according to claim 1, characterized in that: The top edge of the handwheel (3) is printed with a locking mark (410). When the handwheel (3) is in the fully locked state, the locking mark (410) corresponds to the position of the limit post (45).

Images