Nuclear power steam cut-off control butterfly valve

Abstract

The utility model relates to the technical field of butterfly valves, and discloses a nuclear power steam cut-off control butterfly valve which comprises a valve body, a sealing mechanism is arranged on the valve body, the sealing mechanism comprises an execution box body, a hollow valve rod, an air pump, a valve clack, a high-temperature-resistant sealing air bag, a sealing connecting groove and an inflation hole, and the execution box body is fixedly installed at the top of the valve body. The hollow valve rod is communicated with the air pump, and the valve clack is fixedly installed at the bottom end of the hollow valve rod. The inflated high-temperature-resistant sealing air bag expands, so that the joint between the valve clack and the valve body is sealed, the difference between thermal expansion and cold contraction between the valve clack and the valve body due to temperature change can be buffered to a certain extent, the inflated high-temperature-resistant sealing air bag can adapt to the change through elastic deformation of the high-temperature-resistant sealing air bag, and the sealing effect is good. The tight contact of the sealing surfaces is kept, and the risk of sealing failure caused by thermal expansion and cold contraction is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, in particular to a nuclear power steam cut-off control butterfly valve. Background Art

[0002] Precise steam control and safe shutoff are crucial in the operation of nuclear power plants. As an important working medium, steam is involved in multiple critical thermal and hydraulic processes, such as the steam transmission link between steam generators and steam turbines.

[0003] According to a Chinese patent application with the publication number "CN210661396U," a precision-controlled butterfly valve is disclosed, which relates to the field of butterfly valve manufacturing technology. The utility model comprises a valve body, a first valve stem, and a cylinder. A pad is fixed to one surface of the valve body, and a set of clamping blocks are fixed to the side surface of the pad. The two clamping blocks are located in the same plane and are arranged perpendicular to each other. A first slot is formed at the axis of the pad. The first valve stem has a clearance fit with the inner wall of the first slot. A set of symmetrically distributed sliding grooves are formed on the side surface of the first valve stem. The first valve stem has a clearance fit with the inner wall of the cylinder. A spring is fixed to the inner wall of the cylinder. The utility model can effectively control the opening and closing of the butterfly valve by cooperating with a plurality of third slots distributed in an isosceles right triangle on the cover body and a group of vertically distributed clamping blocks fixed on the pad, so that the opening size and closing position of the butterfly valve can be accurately controlled, thereby making the use of the butterfly valve more convenient and having a better control effect on the liquid, thereby promoting the application of the butterfly valve in actual production. When the above-mentioned butterfly valve is used, a good sealing structure is not set. Since the steam temperature fluctuation range of the nuclear power plant is large, the dimensional changes of the valve disc and the valve body caused by thermal expansion and contraction are difficult to coordinate, which can easily lead to gaps in the sealing surface and cause steam leakage, which not only affects the efficiency of steam transportation, but may also cause safety hazards due to the leaked steam. Therefore, a nuclear power steam cut-off control butterfly valve is proposed to solve the above-mentioned problems. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide a nuclear power steam cut-off control butterfly valve in view of the deficiencies in the above-mentioned prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a nuclear power steam cut-off control butterfly valve, including a valve body, a sealing mechanism is provided on the valve body, and the sealing mechanism includes an execution box, a hollow valve stem, an air pump, a valve disc, a high-temperature resistant sealing airbag, a sealing connection groove, and an inflation hole. The execution box is fixedly installed on the top of the valve body, the hollow valve stem is connected to the air pump, the valve disc is fixedly installed on the bottom end of the hollow valve stem, the high-temperature resistant sealing airbag is fixedly installed on the outer wall of the valve disc, the sealing connection groove is opened inside the valve body, and the inflation hole is opened on the outer wall of the valve disc. One end of the inflation hole is connected to the high-temperature resistant sealing airbag, and the other end of the inflation hole is connected to the hollow valve stem.

[0006] Preferably, the sealing mechanism further comprises a motor, which is fixedly mounted inside the execution box. According to this preference, by starting the motor, the motor output shaft drives the helical gear set fixedly mounted on the outer wall to rotate.

[0007] Preferably, the sealing mechanism further comprises a helical gear set, one of which is fixedly sleeved on the outer wall of the motor output shaft, and the other helical gear of the helical gear set is fixedly sleeved on the outer wall of the hollow valve stem. With this preferred embodiment, the helical gear set rotates, and the hollow valve stem is driven to rotate by the transmission connection between the two helical gears.

[0008] Preferably, the valve body is further provided with a filter mechanism, the filter mechanism comprising a filter screen, the filter screen being mounted on both ends of the valve body via a screw rod. According to this preferred embodiment, the filter screen can filter out tiny solid particles in the steam.

[0009] Preferably, the filter mechanism further comprises a flange, which is fixedly mounted at both ends of the valve body. According to this preference, the flange can be connected to the steam pipe via the flange.

[0010] Preferably, the two flanges are provided with connecting holes. According to this preference, the flanges can be connected via the connecting holes.

[0011] Preferably, the filter mechanism further comprises a sealing connection ring, which is fixedly mounted at both ends of the valve body. According to this preference, the sealing connection ring can seal the connection between the valve body and the steam pipe.

[0012] The utility model adopts the above technical solution, which can bring the following beneficial effects:

[0013] 1. The nuclear power steam cut-off control butterfly valve, through the cooperation of the actuator box, hollow valve stem, air pump, valve disc, high-temperature resistant sealing airbag, sealing connection groove, inflation hole, motor, and helical gear set, the inflated high-temperature resistant sealing airbag expands, thereby sealing the connection between the valve disc and the valve body. It can also buffer the difference in thermal expansion and contraction between the valve disc and the valve body caused by temperature changes to a certain extent. The inflated high-temperature resistant sealing airbag can adapt to this change through its own elastic deformation, maintain close contact of the sealing surface, and reduce the risk of sealing failure caused by thermal expansion and contraction.

[0014] 2. The nuclear power steam cut-off control butterfly valve can seal the connection between the valve body and the steam pipe through the cooperation of the filter, flange and sealing connection ring. The filter can filter out tiny solid particles in the steam to prevent these impurities from adhering to the inside of the valve body, and can also indirectly protect the high-temperature resistant sealing airbag. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the valve disc structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the sealing connection groove structure of the utility model;

[0018] Figure 4 This is a schematic diagram of the internal structure of the execution box of the utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the high temperature resistant sealed airbag of the utility model;

[0020] Figure 6 This is a schematic diagram of the inflation hole structure of the utility model.

[0021] In the figure: 1. Valve body; 21. Sealing mechanism; 211. Actuator housing; 212. Hollow valve stem; 213. Air pump; 214. Valve disc; 215. High-temperature resistant sealing airbag; 216. Sealing connection groove; 217. Inflating hole; 218. Motor; 219. Helical gear set; 31. Filter mechanism; 311. Filter screen; 312. Flange; 313. Sealing connection ring. DETAILED DESCRIPTION

[0022] 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.

[0023] 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 directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0024] 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.

[0025] 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.

[0026] See also Figure 1-6 , One embodiment of the utility model is: a nuclear power steam cut-off control butterfly valve, including a valve body 1, a sealing mechanism 21 is provided on the valve body 1, the sealing mechanism 21 includes an execution box 211, a hollow valve stem 212, an air pump 213, a valve disc 214, a high-temperature resistant sealing airbag 215, a sealing connection groove 216, and an inflation hole 217. The execution box 211 is fixedly installed on the top of the valve body 1, the hollow valve stem 212 is connected to the air pump 213, the valve disc 214 is fixedly installed on the bottom end of the hollow valve stem 212, and the high-temperature resistant sealing airbag 215 is fixedly installed on the outer wall of the valve disc 214. A sealing connection groove 216 is provided inside the valve body 1, and an inflation hole 217 is provided on the outer wall of the valve disc 214. One end of the inflation hole 217 is connected to the high-temperature resistant sealing airbag 215, and the other end of the inflation hole 217 is connected to the hollow valve stem 212. The sealing mechanism 21 also includes a motor 218, which is fixedly mounted inside the actuator housing 211. The sealing mechanism 21 also includes a helical gear set 219, one of the helical gears in the helical gear set 219 is fixedly sleeved on the outer wall of the output shaft of the motor 218, and the other helical gear in the helical gear set 219 is fixedly sleeved on the outer wall of the hollow valve stem 212.

[0027] Working principle: By starting the motor 218, the output shaft of the motor 218 drives the helical gear set 219 fixed on the outer wall to rotate, and through the transmission connection of the two helical gears, the hollow valve stem 212 is driven to rotate, thereby driving the valve disc 214 to rotate, so that the steam supply is cut off, and the high-temperature resistant sealing airbag 215 is located in the sealing connection groove 216. By starting the air pump 213, the air pump 213 inflates the high-temperature resistant sealing airbag 215 through the hollow valve stem 212 and the inflation hole 217. The inflated high-temperature resistant sealing airbag 215 expands, thereby sealing the connection between the valve disc 214 and the valve body 1, and can also buffer the thermal expansion and contraction differences between the valve disc 214 and the valve body 1 due to temperature changes to a certain extent. The inflated high-temperature resistant sealing airbag 215 can adapt to this change through its own elastic deformation, maintain close contact of the sealing surface, and reduce the risk of sealing failure caused by thermal expansion and contraction.

[0028] See also Figure 1-6On the basis of the above embodiment, in another embodiment of the present utility model, a filtering mechanism 31 is further provided on the valve body 1, and the filtering mechanism 31 includes a filter screen 311, which is installed at both ends of the valve body 1 through a screw. The filtering mechanism 31 also includes a flange 312, which is fixedly installed at both ends of the valve body 1. Both flanges 312 are provided with connecting holes. The filtering mechanism 31 also includes a sealing connecting ring 313, which is fixedly installed at both ends of the valve body 1.

[0029] Working principle: The flange connection with the steam pipe can be achieved through the flange plate 312, and the sealing connection ring 313 can seal the connection between the valve body 1 and the steam pipe. By setting the filter screen 311, the filter screen 311 can filter out tiny solid particle impurities in the steam to prevent these impurities from adhering to the inside of the valve body 1, and can also indirectly protect the high-temperature resistant sealing airbag 215.

[0030] It is worth noting that, in order to facilitate control, a control switch is provided on the motor 218 in the above embodiment, and the control switch can control the motor 218 to work. The above are all existing technologies and are not the main innovations, so they will not be described in detail here.

[0031] The present invention provides a nuclear power steam shutoff control butterfly valve. There are numerous methods and approaches for implementing this technical solution. The above is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art may make improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are considered within the scope of protection of the present invention. Any components not specified in this embodiment may be implemented using existing technologies.

Claims

1. A nuclear power steam cut-off control butterfly valve, comprising a valve body (1), characterized in that: The valve body (1) is provided with a sealing mechanism (21), the sealing mechanism (21) comprising an execution box (211), a hollow valve stem (212), an air pump (213), a valve flap (214), a high-temperature resistant sealing airbag (215), a sealing connection groove (216), and an inflation hole (217); the execution box (211) is fixedly mounted on the top of the valve body (1); the hollow valve stem (212) is connected to the air pump (213); the valve flap (214) is fixedly mounted on the bottom end of the hollow valve stem (212), the high-temperature resistant sealing airbag (215) is fixedly mounted on the outer wall of the valve disc (214), the sealing connection groove (216) is provided inside the valve body (1), the inflation hole (217) is provided on the outer wall of the valve disc (214), one end of the inflation hole (217) is connected to the high-temperature resistant sealing airbag (215), and the other end of the inflation hole (217) is connected to the hollow valve stem (212).

2. A nuclear power steam cut-off control butterfly valve according to claim 1, characterized in that: The sealing mechanism (21) further includes a motor (218), and the motor (218) is fixedly installed inside the execution box (211).

3. The nuclear power steam cut-off control butterfly valve according to claim 1, characterized in that: The sealing mechanism (21) further comprises a helical gear set (219), one helical gear in the helical gear set (219) being fixedly sleeved on the outer wall of the output shaft of the motor (218), and another helical gear in the helical gear set (219) being fixedly sleeved on the outer wall of the hollow valve stem (212).

4. The nuclear power steam cut-off control butterfly valve according to claim 1, characterized in that: The valve body (1) is further provided with a filtering mechanism (31), the filtering mechanism (31) comprising a filtering screen (311), and the filtering screen (311) is mounted on both ends of the valve body (1) via a screw.

5. A nuclear power steam cut-off control butterfly valve according to claim 4, characterized in that: The filtering mechanism (31) further comprises a flange (312), and the flange (312) is fixedly mounted on both ends of the valve body (1).

6. A nuclear power steam cut-off control butterfly valve according to claim 5, characterized in that: The two flanges (312) are both provided with connection holes.

7. The nuclear power steam cut-off control butterfly valve according to claim 4, characterized in that: The filtering mechanism (31) further comprises a sealing connection ring (313), and the sealing connection ring (313) is fixedly mounted on both ends of the valve body (1).

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