Electric butterfly valve capable of being closed after power failure for nuclear power system

Abstract

The utility model relates to the technical field of electric butterfly valves, and discloses an electric butterfly valve capable of being closed during power failure for a nuclear power system, which comprises a valve body, a valve rod is rotatably connected onto the valve body, a butterfly plate is fixedly connected onto the outer wall of the valve rod, and a manual closing mechanism is arranged on the valve body. The manual closing mechanism comprises a shell, a gear, a sliding block and a lead screw. The lead screw rotates and horizontally moves, so that the lead screw pushes the sliding block to horizontally slide along the inner wall of the sliding groove, the sliding block moves to drive the rack to move, the rack is meshed with the gear, the rack drives the gear to rotate, the gear drives the valve rod to rotate, the valve rod drives the butterfly plate to rotate and close, and therefore the valve body is closed. Therefore, the valve can be quickly closed during power failure, leakage is prevented, and the safety requirement of a metallurgical or nuclear power system is met.

Description

Technical Field

[0001] The utility model relates to the technical field of electric butterfly valves, in particular to an electric butterfly valve for closing when power is lost in a nuclear power system. Background Art

[0002] At present, electric butterfly valves are used in the metallurgical and nuclear power industries. When the system loses power, due to the self-locking function of the electric device, the valve can only be in the position where it was when the power was off. The butterfly plate cannot close automatically when the power is off, which makes it easy for accidental leakage accidents to occur. Therefore, an electric butterfly valve that closes when the power is off is proposed for nuclear power systems to solve the above problems. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide an electric butterfly valve for closing when power is lost in a nuclear power system in view of the deficiencies in the above-mentioned prior art.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: an electric butterfly valve for closing in case of power failure for a nuclear power system, comprising a valve body, a valve stem being rotatably connected to the valve body, a butterfly plate being fixedly connected to the outer wall of the valve stem, and a manual closing mechanism being provided on the valve body;

[0005] The manual closing mechanism includes: a housing, a gear, a slider, and a screw rod. The housing is bolted to the top of the valve body, the top of the valve stem extends into the housing, the gear is fixedly sleeved on the outer wall of the valve stem and is located in the housing, the slider is slidably connected to the bottom inner wall of the housing, the top of the slider is fixedly connected to a rack, and the screw rod is threadedly connected to the left side of the housing.

[0006] Preferably, a threaded hole is provided on the left side of the shell, and the screw rod is threadedly connected in the threaded hole.

[0007] Preferably, the right end of the screw rod is rotatably connected to the left side of the slider through a bearing, and the left end of the screw rod is fixedly connected to a handwheel. By turning the handwheel, the screw rod can be driven to rotate and move horizontally along the threaded hole, thereby causing the screw rod to push the slider to slide horizontally.

[0008] Preferably, a sliding groove is provided on the bottom inner wall of the shell, and the bottom of the slider is slidably connected in the sliding groove. The slider slides along the inner wall of the sliding groove, and the sliding groove limits the slider, thereby preventing the slider from rotating with the screw rod, thereby improving the movement stability of the slider.

[0009] Preferably, a wear-resistant alloy block is welded on the edge of the butterfly plate. The material of the wear-resistant alloy block is a cobalt-based alloy. The wear-resistant alloy block is set to form a wear-resistant protective layer on the edge of the butterfly plate. The wear-resistant alloy block has high hardness and good wear resistance, can effectively resist the erosion and wear of the nuclear medium, extend the service life of the butterfly plate, and improve the sealing performance.

[0010] Preferably, a sealing sleeve is provided on the inner wall of the valve body, and an electric device is provided on the shell. The electric device includes an electric control box connected to the shell, a drive motor is connected to the electric control box, and the top end of the valve stem extends into the electric control box and is connected to the output end of the drive motor. By starting the drive motor, the valve stem and the butterfly plate can be driven to rotate to realize the electric control switch valve.

[0011] The utility model adopts the above technical solution, which can bring the following beneficial effects:

[0012] 1. This electric butterfly valve for closing when power is lost in a nuclear power system rotates and moves horizontally through the screw rod, so that the screw rod pushes the slider to slide horizontally along the inner wall of the slide groove. The movement of the slider drives the rack to move, so that the rack engages with the gear, so that the rack drives the gear to rotate, and the gear drives the valve stem to rotate, so that the valve stem drives the butterfly plate to rotate and close, thereby closing the valve body. This can achieve rapid closure of the valve when power is lost, prevent leakage, and meet the safety requirements of metallurgical or nuclear power systems.

[0013] 2. This electric butterfly valve used in nuclear power systems closes when power is lost. The wear-resistant alloy block is set to form a wear-resistant protective layer on the edge of the butterfly plate, which can effectively resist the erosion and wear of the nuclear medium, extend the service life of the butterfly plate, and improve the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0015] Figure 2 It is a top cross-sectional view of the utility model;

[0016] Figure 3 It is a partial front cross-sectional view of the utility model;

[0017] Figure 4 for Figure 3 Enlarged view of point A.

[0018] In the figure: 1. Valve body; 2. Valve stem; 3. Butterfly plate; 4. Manual closing mechanism; 41. Housing; 42. Gear; 43. Slider; 44. Rack; 45. Screw; 46. Handwheel; 47. Slide; 5. Wear-resistant alloy block. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "disposed" should be understood in a broad sense. For example, they may refer to fixed connection or disposition, detachable connection or disposition, or integral connection or disposition. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "several" means two or more, unless otherwise specifically defined.

[0023] See also Figure 1-4An embodiment of the present invention is: an electric butterfly valve for closing when power is lost for use in a nuclear power system, comprising a valve body 1, a valve stem 2 being rotatably connected to the valve body 1, a butterfly plate 3 being fixedly connected to the outer wall of the valve stem 2, and a manual closing mechanism 4 being provided on the valve body 1; the manual closing mechanism 4 comprising: a housing 41, a gear 42, a slider 43, and a screw rod 45, the housing 41 being bolted to the top of the valve body 1, the top end of the valve stem 2 extending into the housing 41, the gear 42 being fixedly sleeved on the outer wall of the valve stem 2 and located in the housing 41, the slider The bottom inner wall of the housing 41 is provided with a slide groove 47, and the bottom of the slider 43 is slidably connected to the slide groove 47. The slider 43 slides along the inner wall of the slide groove 47, and the slide groove 47 limits the slider 43, thereby preventing the slider 43 from rotating with the screw rod 45, thereby improving the movement stability of the slider 43. The top of the slider 43 is fixedly connected with a rack 44, and the screw rod 45 is threadedly connected to the left side of the housing 41. The left side of the housing 41 is provided with a threaded hole, and the screw rod 45 is threaded. Connected in the threaded hole, the right end of the screw rod 45 is rotatably connected to the left side of the slider 43 through a bearing, and the left end of the screw rod 45 is fixedly connected to a handwheel 46. By turning the handwheel 46, the screw rod 45 can be driven to rotate and move horizontally along the threaded hole, so that the screw rod 45 pushes the slider 43 to slide horizontally along the inner wall of the slide groove 47. The movement of the slider 43 drives the rack 44 to move, so that the rack 44 engages with the gear 42, so that the rack 44 drives the gear 42 to rotate, and the gear 42 drives the valve stem 2 to rotate, so that the valve stem 2 drives the butterfly plate 3 to rotate and close, thereby closing the valve body 1, thereby achieving rapid closure of the valve when power is lost to prevent leakage, meeting the safety requirements of metallurgical or nuclear power systems, a sealing sleeve is provided on the inner wall of the valve body 1, and an electric device is provided on the housing 41. The electric device includes an electric control box connected to the housing 41, and a drive motor is connected to the electric control box. The top end of the valve stem 2 extends into the electric control box and is connected to the output end of the drive motor. By starting the drive motor, the valve stem 2 and the butterfly plate 3 can be driven to rotate to realize the electrically controlled switch valve.

[0024] Working principle: In the power-off state, by turning the handwheel 46, the screw rod 45 is driven to rotate and move horizontally along the threaded hole, so that the screw rod 45 pushes the slider 43 to slide horizontally along the inner wall of the slide groove 47. The movement of the slider 43 drives the rack 44 to move, so that the rack 44 engages with the gear 42, so that the rack 44 drives the gear 42 to rotate, and the gear 42 drives the valve stem 2 to rotate, so that the valve stem 2 drives the butterfly plate 3 to rotate and close, thereby closing the valve body 1, so that the valve can be quickly closed when the power is off to prevent leakage.

[0025] See also Figure 1-4On the basis of the above embodiment, in another embodiment of the present invention, a wear-resistant alloy block 5 is welded on the edge of the butterfly plate 3. The material of the wear-resistant alloy block 5 is a cobalt-based alloy. The wear-resistant alloy block 5 is provided to form a wear-resistant protective layer on the edge of the butterfly plate 3. The wear-resistant alloy block 5 has high hardness and good wear resistance, can effectively resist the erosion and wear of the nuclear medium, extend the service life of the butterfly plate 3, and improve the sealing performance.

[0026] Working principle: The wear-resistant alloy block 5 is provided to form a wear-resistant protective layer on the edge of the butterfly plate 3, which can effectively resist the erosion and wear of the nuclear medium, extend the service life of the butterfly plate 3, and improve the sealing performance.

[0027] It is worth noting that the electric device in the above embodiment is a commonly used device in the prior art, and the model used can be customized according to actual usage requirements. The power supply interface of the electrical equipment in this utility is connected to the power supply system through a switch (not shown in the figure) and a wire (not shown in the figure) to achieve its control. The circuits and controls involved are all prior art and are well known in the current field of technology, so they will not be described in detail here.

[0028] This utility model provides an electric butterfly valve for closing upon power failure in a nuclear power system. There are many methods and approaches for implementing this technical solution. The above is merely a preferred embodiment of the utility model. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the utility model, and such improvements and modifications should be considered within the scope of protection of the utility model. Any components not specified in this embodiment may be implemented using existing technologies.

Claims

1. An electric butterfly valve for closing upon power failure for a nuclear power system, comprising a valve body (1), characterized in that: The valve body (1) is rotatably connected to a valve stem (2), an outer wall of the valve stem (2) is fixedly connected to a butterfly plate (3), and a manual closing mechanism (4) is provided on the valve body (1); The manual closing mechanism (4) comprises: a housing (41), a gear (42), a slider (43), and a screw rod (45); the housing (41) is bolted to the top of the valve body (1); the top of the valve stem (2) extends into the housing (41); the gear (42) is fixedly sleeved on the outer wall of the valve stem (2) and is located in the housing (41); the slider (43) is slidably connected to the bottom inner wall of the housing (41); the top of the slider (43) is fixedly connected to a rack (44); and the screw rod (45) is threadedly connected to the left side of the housing (41).

2. The electric butterfly valve for closing upon power failure for a nuclear power system according to claim 1, characterized in that: A threaded hole is provided on the left side of the housing (41), and the screw rod (45) is threadedly connected in the threaded hole.

3. The electric butterfly valve for closing upon power failure for a nuclear power system according to claim 1, characterized in that: The right end of the screw rod (45) is rotatably connected to the left side of the slider (43) through a bearing, and the left end of the screw rod (45) is fixedly connected to a hand wheel (46).

4. The electric butterfly valve for closing upon power failure for a nuclear power system according to claim 1, characterized in that: A sliding groove (47) is provided on the inner wall of the bottom of the housing (41), and the bottom of the slider (43) is slidably connected in the sliding groove (47).

5. The electric butterfly valve for closing upon power failure for a nuclear power system according to claim 1, characterized in that: Wear-resistant alloy blocks (5) are built-up welded on the edge of the butterfly plate (3).

6. The electric butterfly valve for closing upon power failure for a nuclear power system according to claim 5, characterized in that: The wear-resistant alloy block (5) is made of cobalt-based alloy.

7. The electric butterfly valve for closing upon power failure for a nuclear power system according to claim 1, characterized in that: The inner wall of the valve body (1) is provided with a sealing sleeve, and the housing (41) is provided with an electric device.

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