A valve operating device installed on a shielding door and a method for installing and using the same

Abstract

The application discloses a valve operating device installed on a shielding door and a mounting and using method thereof, which can simplify the installation and operation process of a valve operating handle in a shielding door in a nuclear power system, and reduce the radiation risk to an operator, and the specific scheme is as follows: a valve is provided with a valve rod, a valve extension rod is connected to the valve rod in the axial direction, a first annular gear rack is arranged at the end of the valve rod, a second annular gear rack is arranged at one end of the valve extension rod close to the valve rod and engaged with the first annular gear rack, an operating handle for rotating the valve extension rod is arranged at the other end of the valve extension rod away from the valve rod, the valve extension rod penetrates through a through hole in the shielding door, an outside shielding plate is arranged outside the shielding door, a retaining ring is fixedly connected to the valve extension rod, and a spring is arranged between the retaining ring and the outside shielding plate.

Description

Technical Field

[0001] This invention relates to the field of nuclear power valve technology, and in particular to a valve operating device installed on a shielding door and its installation and usage method. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] In nuclear power systems, due to radiation from radioactive materials, some equipment valves are isolated from the outside environment by a shielding door. The shielding door has a circular opening with a valve stem and its extension connecting to the outside. A shielding layer is installed on the inner or outer side to enhance radiation protection. These valves are typically controlled by an operating device outside the shielding door. This device works in conjunction with the valve extension; operating the device causes the valve stem to rotate the valve core. When the valve is not in operation, the operating device is usually removed and stored in a designated location. A shielding plug is then placed on the outside of the shielding door opening and secured to the outer shielding door with bolts.

[0004] Different valves have different valve stem head styles, including hexagonal, oblong, and square heads. Therefore, there are certain requirements for the azimuth angle of the operating device when connecting and installing the valve stem extension rod to the valve stem after the shielding door is opened and closed. Furthermore, the operating device and shielding plug need to be repeatedly disassembled and reassembled during valve adjustment. For example, patent [CN 210378509 U] discloses a valve device for a nuclear power system, including a valve cabinet containing a valve, an extension rod connected axially to the valve stem, and an operating hole on the shielding door of the valve cabinet for inserting a wrench. The wrench can be inserted through the operating hole and rotated to rotate the extension rod, thereby rotating the valve stem. A detachable shielding plug is provided on the shielding door to seal the operating hole. When it is necessary to adjust the opening or closing of the valve, the shielding plug needs to be removed to expose the operating hole, and a wrench needs to be inserted through the operating hole to rotate the extension rod. When the shielded door is opened or closed, the operating device and extension rod need to be removed or installed together, which greatly increases the risk of radiation exposure to the operators. Not only is the process very cumbersome, but the increased installation and operation time also increases the risk of radioactive materials harming the operators. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the primary objective of this invention is to provide a valve operating device installed on a shielded door and its installation and usage method, which simplifies the installation and operation process of valve operating handles inside shielded doors in nuclear power systems, while reducing the risk of radiation to operators.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] A valve operating device installed on a shielding door includes a valve, a valve stem connected axially to a valve extension rod, a first annular rack at the end of the valve stem, a second annular rack meshing with the first annular rack at the end of the valve extension rod near the valve stem, and an operating handle for rotating the valve extension rod at the end away from the valve stem.

[0008] The valve extension rod passes through the through hole on the shielding door. An outer shielding plate is provided on the outside of the shielding door. A retaining ring is fixedly connected to the valve extension rod. A spring is installed between the retaining ring and the outer shielding plate.

[0009] Furthermore, the outer shielding plate is provided with an outer limiting hole, through which the valve extension rod passes, and the outer limiting hole and the valve extension rod are clearance-fitted.

[0010] Furthermore, an inner shielding plate is provided on the inner side of the shielding door, and an inner limiting hole is provided on the inner shielding plate, which is in clearance fit with the valve extension rod.

[0011] Furthermore, the inner diameter of the through hole is larger than the diameter of the valve extension rod, and the retaining ring is disposed inside the through hole and has a clearance fit with the through hole.

[0012] Furthermore, the operating handle is a two-way ratchet wrench, and a ratchet assembly is provided on the operating handle.

[0013] Furthermore, the operating handle is equipped with a direction switching switch for controlling the rotation direction of the ratchet.

[0014] Furthermore, the shielding door is provided with a limit stop block, which is located at the edge of the rotation area of ​​the valve operating handle.

[0015] The above-mentioned method for installing a valve operating device on a shielding door is characterized by comprising the following steps:

[0016] First install the valve and shielding door, then install the valve stem extension rod, valve stem extension rod retaining ring, spring, outer shielding plate, bolts, and operating handle;

[0017] Then close the shielding door. Determine whether the valve stem extension rod and the valve stem are fully engaged based on the distance the valve stem extension rod protrudes from the outer shielding plate. If they are not fully engaged, turn the operating handle in the direction that makes it easier to turn. The operating handle will drive the valve stem extension rod to rotate and, under the push of the spring, make the valve stem extension rod fully engaged with the valve stem. Finally, according to the system operation requirements, turn the operating handle to put the valve in the open or closed position.

[0018] Furthermore, the installation of the valve stem extension rod, valve stem extension rod retaining ring, spring, outer shielding plate, bolts, and operating handle specifically includes the following steps:

[0019] After installing and positioning the valve, mark the positions of the valve stem extension rod, valve stem extension rod retaining ring, and outer shielding plate on the shielding door. Then drill a through hole with a diameter slightly larger than the diameter of the valve stem extension rod retaining ring. Install the retaining ring on the valve stem extension rod and the spring on the retaining ring. Then, preliminarily align the valve stem with the valve, position the outer shielding plate, and fix the outer shielding plate to the shielding door. Adjust the valve stem extension rod to be horizontal.

[0020] A method for using a valve operating device installed on a shielding door includes the following steps:

[0021] After the shielding door is opened and closed, determine whether the valve stem extension rod and the valve stem are fully engaged based on the distance of the valve stem extension rod protruding from the outer shielding plate. If they are not fully engaged, select the direction that makes it easier to turn the operating handle. The operating handle will drive the valve stem extension rod to rotate and, under the push of the spring, make the valve stem extension rod fully engaged with the valve stem. Finally, according to the system operation requirements, turn the operating handle to put the valve in the open or closed position.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1) The valve stem extension rod of this invention features a two-ring rack and pinion meshing structure at its end, facilitating connection between the valve stem extension rod and the valve stem during the opening and closing of the shielded door and during installation. Specifically, a spring is installed between the valve stem extension rod retaining ring and the outer shielding plate. When the valve stem extension rod and the valve stem are not fully engaged, the spring is compressed, resulting in a larger distance of the valve stem extension rod protruding from the outer shielding plate, and vice versa. In this case, simply select the direction in which the operating handle can be turned, and the operating handle will rotate the valve stem extension rod, causing it to fully engage with the valve stem under the push of the spring. This eliminates the need to remove or install the extension rod after the shielded door is opened or closed, reducing installation and operation time, simplifying the installation and operation process of the valve operating handle inside the shielded door in nuclear power systems, and reducing the risk of radiation exposure to operators.

[0024] 2) This invention uses a combination of valve stem extension rod retaining ring, inner shielding plate, and outer shielding plate to reduce the harm to operators caused by radioactive materials during valve operation. An inner shielding plate is added to the inside of the shielding door, which at the same time serves to shield and support the valve stem extension rod, prevent the valve stem extension rod from sagging, avoid the valve stem extension rod and valve stem being of different heights, and facilitate the connection between the valve stem extension rod and valve stem.

[0025] 3) The valve operating handle adopts a ratchet assembly structure. The ratchet assembly can be directly sleeved on the end of the valve stem extension rod to drive the valve stem extension rod to rotate. This facilitates the connection between the valve stem extension rod and the valve stem, eliminating the need to repeatedly disassemble and install the operating device and shielding plug during valve adjustment, thus reducing the valve adjustment time. At the same time, it can be adjusted when there is misalignment between the teeth of the valve stem extension rod and the valve stem. Attached Figure Description

[0026] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0027] Figure 1 This is a schematic diagram of a valve operating device installed on a shielding door according to one or more embodiments of the present invention.

[0028] Figure 2 This is a left view of a valve operating device installed on a shielding door according to one or more embodiments of the present invention.

[0029] Figure 3 This is a top view of the first annular rack of a valve operating device installed on a shielding door according to one or more embodiments of the present invention.

[0030] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0031] Wherein: 1-Valve; 2-Valve stem; 3-1-Valve stem extension rod; 3-2-Retaining ring; 4-Inner shielding plate; 5-Shielding door; 6-Outer shielding plate; 7-Bolt; 8-Ratchet assembly; 9-Direction switching switch; 10-Operating handle; 11-Spring; 12-Limit stop block; 13-First annular rack; 14-Tooth; 15-Second annular rack. Detailed Implementation

[0032] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0033] Example 1

[0034] A valve operating device installed on a shielded door, such as Figure 1 As shown, it includes a valve 1, a valve stem 2 with an extension rod 3-1 connected axially thereto, and a first annular rack 13 provided at the end of the valve stem, as shown. Figure 3As shown, the first annular rack 13 includes a plurality of teeth 14 evenly distributed on its circumference, and a second annular rack 15 that meshes with the first annular rack is provided at one end of the valve extension rod near the valve stem; an operating handle 10 for rotating the valve extension rod is provided at one end of the valve extension rod away from the valve stem.

[0035] The valve extension rod passes through the through hole on the shielding door 5. An outer shielding plate 6 is connected to the outside of the shielding door by bolts 7. A retaining ring 3-2 is fixedly connected to the valve extension rod. A spring 11 is installed between the retaining ring and the outer shielding plate.

[0036] The valve stem extension rod of this invention features a two-ring rack meshing structure at its end, facilitating connection between the valve stem extension rod and the valve stem during opening and closing of the shielding door and during installation. Specifically, a spring is installed between the valve stem extension rod retaining ring and the outer shielding plate. When the valve stem extension rod is not fully engaged with the valve stem, the spring is compressed, resulting in a larger distance of the valve stem extension rod protruding from the outer shielding plate, and vice versa. At this time, the tips of the first and second ring racks are in contact. When the operating handle is rotated towards the direction where the tips of the two contacting first and second ring racks are closer, the first ring rack teeth are blocked by the second ring rack teeth, resulting in relatively high resistance. When the operating handle is rotated towards the direction where the tips of the two contacting first and second ring racks are further apart, the teeth move towards the empty position, resulting in lower resistance. The operating handle drives the valve extension rod to rotate, and under the push of the spring, the valve stem extension rod fully engages with the valve stem, resulting in relatively low resistance. Therefore, by simply turning the operating handle in the direction that makes it easier to operate, the handle will rotate the valve extension rod, which, under the push of the spring, will fully engage with the valve stem. This eliminates the need to remove or install the extension rod after the shielded door is opened or closed, reducing installation and operation time, simplifying the installation and operation process of valve operating handles inside shielded doors in nuclear power systems, and reducing the risk of radiation exposure to operators.

[0037] An outer limiting hole is provided on the outer shielding plate. The valve extension rod passes through the outer limiting hole, and the outer limiting hole and the valve extension rod are clearance-fitted.

[0038] An inner shielding plate is provided on the inside of the shielding door, and an inner limiting hole is provided on the inner shielding plate. The inner limiting hole is in clearance fit with the valve extension rod. An inner shielding plate 4 is added to the inside of the shielding door, which serves to shield and support the valve extension rod, prevent the valve extension rod from sagging, avoid the valve extension rod and the valve rod being of different heights, and facilitate the connection between the valve extension rod and the valve rod.

[0039] The inner diameter of the through hole is larger than the diameter of the valve extension rod. The retaining ring is set inside the through hole and fits the through hole with a clearance. The retaining ring can support and fix the valve extension rod to prevent it from falling off.

[0040] like Figure 2 As shown, the operating handle is a two-way ratchet wrench, and a ratchet assembly 8 is provided on the operating handle. The ratchet assembly is installed at the end of the valve extension rod, so that the operating handle can drive the valve extension rod to rotate.

[0041] The operating handle is equipped with a direction switching switch 9, which is part of the ratchet assembly and is used to control the rotation direction of the ratchet, thereby controlling the rotation direction of the operating handle.

[0042] The shielding door is equipped with a limit stop 12, which is located at the edge of the rotation area of ​​the valve operating handle to ensure that the valve is opened and closed in place.

[0043] Example 2

[0044] The above-mentioned method for installing a valve operating device on a shielding door is characterized by comprising the following steps:

[0045] During installation, valve 1 is installed in place along with the process piping. The valve stem 2 needs to be machined into a gear shape at the factory to mate with the valve stem extension rod 3-1. After valve 1 and shielding door 5 are installed, the valve stem extension rod 3-1, valve stem extension rod retaining ring 3-2, spring 11, outer shielding plate 6, inner shielding plate 4, bolt 7, ratchet assembly 8, etc. are then installed.

[0046] Specifically, according to the process piping layout diagram, install valve 1. After valve 1 is installed and positioned, mark the positions of valve stem extension rod 3-1, valve stem extension rod retaining ring 3-2, and outer shielding plate 6 on the shielding gate 5. Then drill a hole with a diameter slightly larger than the diameter of valve stem extension rod retaining ring 3-2. Install the retaining ring on the valve stem extension rod, install the spring on the retaining ring, and align and engage the valve stem extension rod 3-1 with the valve stem 2 of valve 1. Position the outer shielding plate 6. Based on the position of the outer shielding plate 6, determine the position of bolt 7, drill and tap holes, and use bolt 7 to fix the outer shielding plate 6 to the shielding gate 5. After adjusting the valve stem extension rod 3-1 to be horizontal, position the inner shielding plate 4, and then fix the inner shielding plate 4 in a suitable manner. Finally, based on the opening and closing position of valve 1, determine the position of limit stop block 11 and install limit stop block 11.

[0047] Then close the shielding door. Determine whether the valve stem extension rod and the valve stem are fully engaged based on the distance the valve stem extension rod protrudes from the outer shielding plate. If they are not fully engaged, turn on the direction switching switch 9 and select the direction that is easier to turn to turn the operating handle. The operating handle drives the valve stem extension rod to rotate and, under the push of the spring, makes the valve stem extension rod fully engaged with the valve stem. Finally, according to the system operation requirements, turn on the operating handle to put the valve in the open or closed position.

[0048] Example 3

[0049] A method for using a valve operating device installed on a shielding door according to Embodiment 1 includes the following steps:

[0050] After the shielding door is opened and closed, the distance of the valve stem extension rod protruding from the outer shielding plate is used to determine whether the valve stem extension rod and the valve stem are fully engaged. If they are not fully engaged, the direction switching switch 9 is turned to select the direction that can be turned and the operating handle is turned. The operating handle drives the valve stem extension rod to rotate and, under the push of the spring, makes the valve stem extension rod fully engaged with the valve stem. Finally, according to the system operation requirements, the operating handle is turned to put the valve in the open or closed position.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A valve operating device installed on a shielded door, comprising a valve, wherein a valve stem is axially connected to a valve extension rod, characterized in that, The valve stem is provided with a first annular rack at its end, and the valve extension rod is provided with a second annular rack at one end near the valve stem, which meshes with the first annular rack; the valve extension rod is provided with an operating handle for rotating the valve extension rod at one end away from the valve stem. The valve extension rod passes through the through hole on the shielding door. An outer shielding plate is provided on the outside of the shielding door. A retaining ring is fixedly connected to the valve extension rod. A spring is installed between the retaining ring and the outer shielding plate. When the valve extension rod is not fully engaged with the valve rod, the spring is in a compressed state. An inner shielding plate is provided on the inner side of the shielding door, and an inner limiting hole is provided on the inner shielding plate. The inner limiting hole is in clearance fit with the valve extension rod.

2. The valve operating device installed on a shielding door according to claim 1, characterized in that, The outer shielding plate is provided with an outer limiting hole, through which the valve extension rod passes, and the outer limiting hole and the valve extension rod are clearance-fitted.

3. The valve operating device installed on a shielded door according to claim 1, characterized in that, The inner diameter of the through hole is larger than the diameter of the valve extension rod, and the retaining ring is disposed inside the through hole and has a clearance fit with the through hole.

4. The valve operating device installed on a shielded door according to claim 1, characterized in that, The operating handle is a two-way ratchet wrench, and a ratchet assembly is provided on the operating handle.

5. A valve operating device installed on a shielding door according to claim 4, characterized in that, The operating handle is equipped with a direction switching switch to control the rotation direction of the ratchet.

6. A valve operating device installed on a shielded door according to claim 4, characterized in that, The shielding door is equipped with a limit stop block, which is located at the edge of the rotation area of ​​the valve operating handle.

7. A method for installing a valve operating device on a shielded door according to any one of claims 1-6, characterized in that, Includes the following steps: First install the valve and shielding door, then install the valve stem extension rod, valve stem extension rod retaining ring, spring, outer shielding plate, bolts, and operating handle; Close the shielding door. Determine whether the valve stem extension rod and the valve stem are fully engaged based on the distance the valve stem extension rod protrudes from the outer shielding plate. If they are not fully engaged, select the direction that makes it easier to turn the operating handle. The operating handle will drive the valve stem extension rod to rotate and, under the push of the spring, make the valve stem extension rod fully engaged with the valve stem. Finally, according to the system operation requirements, turn the operating handle to put the valve in the open or closed position.

8. The installation method of the valve operating device installed on a shielded door according to claim 7, characterized in that, The specific steps for installing the valve stem extension rod, valve stem extension rod retaining ring, spring, outer shielding plate, bolts, and operating handle are as follows: After the valve is installed and positioned, mark the positions of the valve stem extension rod, valve stem extension rod retaining ring, and outer shielding plate on the shielding door. Then drill a through hole with a diameter slightly larger than the diameter of the valve stem extension rod retaining ring. Install the retaining ring on the valve stem extension rod and the spring on the retaining ring. Then, preliminarily align the valve stem with the valve, position the outer shielding plate, and fix the outer shielding plate to the shielding door. Adjust the valve stem extension rod to be horizontal.

9. A method of using a valve operating device installed on a shielding door according to any one of claims 1-6, characterized in that, Includes the following steps: After the shielding door is opened and closed, determine whether the valve stem extension rod and the valve stem are fully engaged based on the distance of the valve stem extension rod protruding from the outer shielding plate. If they are not fully engaged, select the direction that makes it easier to turn the operating handle. The operating handle will drive the valve stem extension rod to rotate and, under the push of the spring, make the valve stem extension rod fully engaged with the valve stem. Finally, according to the system operation requirements, turn the operating handle to put the valve in the open or closed position.

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