A ball valve with a valve seat bidirectional sealing structure for nuclear power and a sealing method

Abstract

The present invention discloses a ball valve with a valve seat bidirectional sealing structure for nuclear power, which relates to the technical field of ball valves and comprises a valve body, both sides of which are fixedly connected with valve seats, the inner wall of the valve body is rotatably connected with a valve ball, the top of the valve ball is fixedly connected with a transmission rod, and the inner wall of the valve body is provided with a sealing mechanism; the sealing mechanism comprises a top pressure unit, which is arranged on the inner wall of the valve body, and is used for enhancing the operation of the sealing structure; the sealing mechanism also comprises an adsorption unit, which is arranged on one side of the valve body, and is used for further enhancing the operation of the sealing structure. This ball valve with a valve seat bidirectional sealing structure for nuclear power can be blown by driving the first piston block in the piston tube to move, and the sealing gasket is pressed forward by air pressure, so that it can be more firmly in contact with the surface of the valve ball, and the sealing effect can be further increased.

Description

Technical Field

[0001] The invention relates to the technical field of ball valves, in particular to a ball valve with a valve seat bidirectional sealing structure for nuclear power and a sealing method. Background Art

[0002] A ball valve is a valve that uses a hollow sphere as an opening and closing part and controls the flow of media by rotating 90 degrees. The core component of the ball valve is the sphere, which is fixed in the pipeline and opens or closes the fluid channel by rotation. The ball valve with a two-way sealing structure for valve seats for nuclear power is a high-performance valve, mainly used in key systems such as nuclear power plants to ensure strict control and safety of media flow.

[0003] However, when the sealing ring of the existing single-piston ball valve or double-piston ball valve contacts the valve ball for sealing, it usually relies on the reaction force of the spring to push it against the surface of the valve ball. Although it can increase the sealing effect, it still has certain limitations. The spring force is small, and the extrusion effect it can achieve is not large, which leads to poor sealing effect. At the same time, the extrusion force of the spring is not uniform, and the circumferential surface of the sealing gasket cannot be fully squeezed on the surface of the valve ball, which reduces the sealing effect. To this end, we propose a ball valve with a valve seat bidirectional sealing structure for nuclear power. Summary of the invention

[0004] The object of the present invention is to provide a ball valve with a valve seat bidirectional sealing structure and a sealing method for nuclear power, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a ball valve with a valve seat bidirectional sealing structure for nuclear power, comprising a valve body, both sides of the valve body are fixedly connected to valve seats, the inner wall of the valve body is rotatably connected to a valve ball, the top of the valve ball is fixedly connected to a transmission rod, and the inner wall of the valve body is provided with a sealing mechanism;

[0006] The sealing mechanism comprises a pressing unit, which is arranged on the inner wall of the valve body and is used for enhancing the operation of the sealing structure;

[0007] The sealing mechanism further comprises an adsorption unit, which is arranged on one side of the valve body and is used for further enhancing the operation of the sealing structure;

[0008] An auxiliary mechanism is provided on the inner wall of the valve body, and the auxiliary mechanism is used for assisting the operation of the sealing structure.

[0009] Preferably, the top pressure unit includes a piston tube, which is fixedly connected to the inner wall of the valve body, and the number of the piston tubes is four. The inner wall of the valve body is provided with a movable tooth plate, and the number of the movable tooth plates is two. The bottom of the movable tooth plate is fixedly connected to a connecting plate, and the surface of the connecting plate is fixedly connected to two piston rods, and the surface of the connecting plate is fixedly connected to a rubber sealing pad, and the rubber sealing pad is sleeved on the surface of the piston rod and in close contact with the same, one end of the piston rod passes through the inner cavity of the piston tube, and one end of the piston rod is fixedly connected to a first piston block, and the surface of the first piston block is in close contact with the inner cavity of the piston tube, one side of the valve body is fixedly connected to a delivery pipe, and one end of the delivery pipe passes through the inner wall of the valve body and is fixedly connected to the inner cavity of the piston tube, and the number of the delivery pipes is four, and one end of every two of the delivery pipes is fixedly connected to a transfer pipe head, and the transfer pipe The surface of the head is fixedly connected with a connecting pipe, and the number of the connecting pipes is two. The surface of the valve seat is provided with an annular cavity, one end of the connecting pipe is fixedly connected to the inner cavity of the annular cavity, the surface of the valve seat is fixedly connected with a hexagonal column, and the annular cavity is fixedly connected to the surface of the valve seat through the hexagonal column. The surface of the annular cavity is fixedly connected with a short tube, and the number of the short tubes is several. The inner wall of the valve seat is provided with a slide groove, and the number of the slide grooves is several. The inner wall of the valve seat is provided with a piston groove, and the slide groove is connected to the piston groove. The inner wall of the valve seat is provided with an air slot hole, and the number of the air slot holes is several, and each of the air slot holes is connected with the slide groove. One end of the short tube penetrates to the inner wall of the air slot hole, and the inner wall of the slide groove is fixedly connected with a telescopic rod, and the surface of the telescopic rod is fixedly sleeved with a second piston block, and the surface of the second piston block is in close contact with the inner wall of the piston groove.

[0010] Preferably, the adsorption unit comprises a sealing gasket, the sealing gasket is slidably connected to the inner wall of the valve seat, and the number of the sealing gaskets is two.

[0011] Preferably, one end of the telescopic rod is fixedly connected to the surface of the sealing gasket, and one end of the piston tube is fixedly connected to an intake pipe. There are four intake pipes, and one end of the intake pipe passes through the inner wall of the valve seat and is fixedly connected to the inner cavity of the sealing gasket.

[0012] Preferably, the inner cavity of the sealing gasket is fixedly connected with a shaping plate, the number of the shaping plates is two, the inner cavity of the sealing gasket is provided with air holes, the air holes extend to the surface of the sealing gasket, the number of the air holes is several.

[0013] Preferably, an elastic diaphragm is fixedly connected to the inner wall of the air hole, and the elastic diaphragm is made of a rubber material with a certain elasticity.

[0014] Preferably, a partition plate is fixedly connected to the inner wall of the shaping plate, and a baffle is fixedly connected to the inner wall of the shaping plate. The number of the baffles is several, and the partition plate and the baffle divide the inner cavity of the sealing gasket into chambers of the same size. The chambers adjacent to the left and right of the partition plate are respectively fixedly connected to one end of the intake pipe.

[0015] Preferably, a cross silicone valve is fixedly connected to the inner wall of the baffle, and the number of the cross silicone valves is several.

[0016] Preferably, the auxiliary mechanism includes a first gear, which is fixedly sleeved on the surface of the transmission rod, the inner wall of the valve body is rotatably connected with a positioning rod, the number of the positioning rods is two, the bottom of the positioning rod is fixedly connected with a second gear, the second gear is meshed with the first gear, the second gear is meshed with the movable tooth plate, the inner wall of the valve body is fixedly connected with a sliding rod, the surface of the sliding rod contacts the inner wall of the movable tooth plate, the surface of the connecting plate is fixedly connected with a sliding plate, the number of the sliding plates is two, the inner wall of the valve body is fixedly connected with a sliding rod, the number of the sliding rods is two, and the sliding plate is sleeved on the surface of the sliding rod.

[0017] Preferably, a sealing method for a ball valve with a valve seat bidirectional sealing structure for nuclear power comprises the following steps:

[0018] S1: When the user closes the valve body, the transmission rod rotates and drives the valve ball to rotate. The surface of the valve ball contacts the sealing gasket to complete the seal. At the same time, the rotation of the transmission rod drives the first gear fixed on its surface to rotate. The rotation of the first gear drives the positioning rod and the second gear to rotate, and then drives the movable toothed plate meshed with it to move;

[0019] S2: When the movable tooth plate moves, it will drive the first piston block to slide on the inner wall of the piston tube through the piston rod. At this time, the air in the piston tube is squeezed and squeezed into the annular cavity through the delivery pipe, the adapter pipe head and the connecting pipe. Then the air will enter the slide groove and the air groove hole through the short pipe. The continuous input of air will squeeze the second piston block to slide on the inner wall of the piston groove, and the second piston block will drive the output end of the telescopic rod to continuously press the sealing gasket forward, so that it can tightly contact the surface of the valve ball, thereby enhancing the sealing effect;

[0020] S3: When the piston tube cooperates with the first piston block to deliver air, the inner cavity space of the piston tube on the other side of the first piston block will generate negative pressure and achieve the effect of exhausting air, which can achieve the effect of delivering air and exhausting air at the same time. When exhausting air, the air in the sealing gasket will be gradually evacuated through the suction pipe. The movement of the connecting plate drives the rubber sealing gasket to move to one end of the piston tube and closely contact with it, which can avoid air leakage at the connection between the piston rod and the piston tube, and increase the sealing effect of the piston tube;

[0021] S4: When the sealing gasket is in close contact with the surface of the valve ball, the air in the sealing gasket is evacuated to generate negative pressure in its inner cavity. At this time, the elastic diaphragm made of rubber material with a certain elasticity will expand in the opposite direction on the inner wall of the pore, and a certain vacuum area can be generated between the elastic diaphragm, the sealing gasket and the valve ball. At this time, the vacuum area generated by the reverse expansion of the elastic diaphragm cooperates with the sealing gasket, which can generate a certain suction force on the surface of the valve ball. When the suction force cooperates with the forward top pressure generated by the output end of the telescopic rod, the sealing gasket can be further firmly fixed on the surface of the valve ball, further enhancing the overall sealing effect.

[0022] S5: When the air in the sealing gasket is gradually evacuated through the suction pipe, the adjacent chambers on the left and right of the partition plate are fixedly connected to one end of the suction pipe respectively. At this time, two exhaust channels are formed in the sealing gasket. Because the valve ball is spherical, when the valve ball rotates and contacts the sealing gasket, one side of the sealing gasket will be contacted first. At this time, when the sealing gasket and the air hole on one side are completely in contact with the elastic diaphragm, the two channels will continue to evacuate air, which can prevent water or other substances from entering between the sealing gasket, the air hole, the elastic diaphragm and the valve ball, and prevent the occurrence of weak suction. When the two channels continue to evacuate air, the cross silicone valve can be used to gradually complete the exhaust operation in each chamber, further avoiding the reverse expansion of the elastic diaphragm that has not yet contacted the valve ball, and avoiding water or other substances from entering between the sealing gasket, the air hole, the elastic diaphragm and the valve ball. In key systems such as nuclear power plants, better sealing can ensure strict control and safety of medium flow.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention is provided with a top pressure unit. When the user closes the valve body, the first piston block in the piston tube is driven to move to blow air, and the sealing gasket is evenly squeezed forward by the air pressure, so that it can contact the surface of the valve ball more firmly, and the sealing effect can be further increased.

[0025] The present invention provides an adsorption unit. When the first piston block in the piston tube moves to perform a blowing operation, a negative pressure is generated in the inner cavity space of the piston tube on the other side of the first piston block to achieve the effect of exhausting air, thereby achieving the effect of delivering air and exhausting air at the same time. When exhausting air, the sealing gasket and the elastic diaphragm cooperate to generate a certain vacuum area between the elastic diaphragm, the sealing gasket and the valve ball. At this time, the vacuum area generated by the reverse expansion of the elastic diaphragm cooperates with the sealing gasket, which can generate a certain suction force on the surface of the valve ball. When the suction force cooperates with the top pressure generated forward by the output end of the telescopic rod, the sealing gasket can be further firmly fixed on the surface of the valve ball, thereby further enhancing the overall sealing effect. In key systems such as nuclear power plants, better sealing can ensure strict control and safety of medium flow.

[0026] The present invention is provided with an auxiliary mechanism, which can, when the user closes the valve body, rotate the valve ball to drive the first gear and the second gear to rotate, and then drive the movable tooth plate, the piston rod and the first piston block to move in the piston tube, so that the effect of delivering air and extracting air can be achieved when moving, and the movable tooth plate and the connecting plate can be made more stable when moving in the valve body, play a certain guiding role, and increase the stability of the movable tooth plate and the connecting plate in the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a structural schematic diagram of the valve seat of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the transmission rod and the first gear of the present invention;

[0030] Figure 4 It is a structural schematic diagram of the positioning rod and the second gear of the present invention;

[0031] Figure 5 For the present invention Figure 4 A magnified view of the local structure at point A in the middle;

[0032] Figure 6 It is a structural schematic diagram of the valve ball and the piston tube of the present invention;

[0033] Figure 7 For the present invention Figure 6 A magnified view of the local structure at B in the middle;

[0034] Figure 8 It is a schematic diagram of the structure of the annular cavity and the hexagonal column of the present invention;

[0035] Fig. 9 It is a structural schematic diagram of the piston rod and the second piston block of the present invention;

[0036] Fig.10 It is a schematic diagram of the local structure of the present invention;

[0037] Fig.11 For the present invention Fig.10 A magnified view of the local structure at C in the middle;

[0038] Fig.12 It is a schematic diagram of the structure of the sealing gasket of the present invention;

[0039] Fig.13 For the present invention Fig.12 A magnified view of the local structure at D in the middle;

[0040] Fig.14It is a schematic diagram of the structure of the partition plate and the baffle plate of the present invention;

[0041] Fig.15 It is a schematic diagram of the structure of the elastic diaphragm of the present invention;

[0042] Fig.16 The structural schematic diagram of the rubber sealing pad of the present invention is

[0043] In the figure: 1, valve body; 2, sealing mechanism; 3, auxiliary mechanism; 301, first gear; 302, positioning rod; 303, second gear; 304, sliding rod; 305, sliding plate; 306, sliding rod; 4, valve seat; 5, valve ball; 6, transmission rod; 21, top pressure unit; 2101, piston tube; 2102, moving tooth plate; 2103, connecting plate; 2104, piston rod; 2105, first piston block; 2106, delivery pipe; 2107, adapter pipe; 2108, connecting Taking over; 2109, annular cavity; 2110, hexagonal column; 2111, short tube; 2112, slide groove; 2113, telescopic rod; 2114, piston groove; 2115, second piston block; 2116, air groove hole; 2117, rubber sealing pad; 22, adsorption unit; 2201, sealing gasket; 2202, suction pipe; 2203, shaping plate; 2204, air hole; 2205, elastic diaphragm; 2206, partition plate; 2207, baffle; 2208, cross silicone valve. DETAILED DESCRIPTION

[0044] 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 described embodiments 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 creative work are within the scope of protection of the present invention. Example

[0045] See also Figure 1-15 The present invention provides a technical solution: a ball valve with a valve seat bidirectional sealing structure for nuclear power, the present invention makes corresponding improvements to the technical problems mentioned in the background technology, including a valve body 1, both sides of the valve body 1 are fixedly connected with valve seats 4, the inner wall of the valve body 1 is rotatably connected with a valve ball 5, the top of the valve ball 5 is fixedly connected with a transmission rod 6, and the inner wall of the valve body 1 is provided with a sealing mechanism 2;

[0046] The sealing mechanism 2 includes a top pressing unit 21, which is arranged on the inner wall of the valve body 1 and is used for enhancing the operation of the sealing structure;

[0047] The sealing mechanism 2 further includes an adsorption unit 22, which is disposed on one side of the valve body 1 and is used to further enhance the operation of the sealing structure;

[0048] The inner wall of the valve body 1 is provided with an auxiliary mechanism 3, and the auxiliary mechanism 3 is used for auxiliary operation of the sealing structure.

[0049] As a further limitation of the sealing mechanism 2 of the present invention, the top pressure unit 21 includes a piston tube 2101, which is fixedly connected to the inner wall of the valve body 1. The number of piston tubes 2101 is four, and the inner wall of the valve body 1 is provided with a movable tooth plate 2102. The number of movable tooth plates 2102 is two, and the bottom of the movable tooth plate 2102 is fixedly connected to a connecting plate 2103, and the surface of the connecting plate 2103 is fixedly connected to two piston rods 2104, and the surface of the connecting plate 2103 is fixedly connected to a rubber sealing pad 2117, and the rubber sealing pad 2117 is sleeved on the piston rod. The first piston block 2105 is fixedly connected to the surface of the valve body 1 and is in close contact with it. One end of the piston rod 2104 penetrates into the inner cavity of the piston tube 2101. One end of the piston rod 2104 is fixedly connected to the first piston block 2105. The surface of the first piston block 2105 is in close contact with the inner cavity of the piston tube 2101. One side of the valve body 1 is fixedly connected with a delivery pipe 2106. One end of the delivery pipe 2106 penetrates into the inner wall of the valve body 1 and is fixedly connected to the inner cavity of the piston tube 2101. There are four delivery pipes 2106. One end of every two delivery pipes 2106 is fixedly connected with a transfer pipe head 2107. The transfer pipe head 2107 is fixedly connected to the transfer pipe head 2107. The surface of the pipe head 2107 is fixedly connected with a connecting pipe 2108, the number of which is two, the surface of the valve seat 4 is provided with an annular cavity 2109, one end of the connecting pipe 2108 is fixedly connected to the inner cavity of the annular cavity 2109, the surface of the valve seat 4 is fixedly connected with a hexagonal column 2110, the annular cavity 2109 is fixedly connected to the surface of the valve seat 4 through the hexagonal column 2110, the surface of the annular cavity 2109 is fixedly connected with a short tube 2111, the number of which is several, the inner wall of the valve seat 4 is provided with a slide groove 2112, the number of which is There are several of them, a piston groove 2114 is provided on the inner wall of the valve seat 4, the slide groove 2112 is connected to the piston groove 2114, an air slot hole 2116 is provided on the inner wall of the valve seat 4, and the number of the air slot holes 2116 is several, each of the air slot holes 2116 is connected to the slide groove 2112, one end of the short tube 2111 penetrates the inner wall of the air slot hole 2116, a telescopic rod 2113 is fixedly connected to the inner wall of the slide groove 2112, and a second piston block 2115 is fixedly sleeved on the surface of the telescopic rod 2113, and the surface of the second piston block 2115 is in close contact with the inner wall of the piston groove 2114.

[0050] The specific implementation of this embodiment is as follows: when the movable tooth plate 2102 moves, it will drive the first piston block 2105 to slide on the inner wall of the piston tube 2101 through the piston rod 2104. At this time, the air in the piston tube 2101 is squeezed and squeezed into the annular cavity 2109 through the delivery pipe 2106, the adapter pipe head 2107 and the connecting pipe 2108, and then the air will enter the slide groove 2112 and the air groove hole 2116 through the short tube 2111. The continuous input of air will squeeze the second piston block 2115 to slide on the inner wall of the piston groove 2114, and the second piston block 2115 will drive the output end of the telescopic rod 2113 set in the slide groove 2112 to continuously press the sealing gasket 2201 forward so that it can be tightly pressed. It is in tight contact with the surface of the valve ball 5, which enhances the sealing effect. At the same time, when the piston tube 2101 cooperates with the first piston block 2105 to deliver air, the inner cavity space of the piston tube 2101 on the other side of the first piston block 2105 will generate negative pressure and achieve the effect of exhausting air, which can achieve the effect of delivering air and exhausting air at the same time. When exhausting air, the air in the sealing gasket 2201 will be gradually evacuated through the suction pipe 2202. By setting the rubber sealing pad 2117, the connecting plate 2103 moves to drive the rubber sealing pad 2117 to move to one end of the piston tube 2101 and contact it closely, which can avoid leakage at the connection between the piston rod 2104 and the piston tube 2101, thereby increasing the sealing effect of the piston tube 2101. Example

[0051] See also Figure 1-15 The present invention provides a technical solution: a ball valve with a valve seat 4 bidirectional sealing structure for nuclear power. The present invention makes corresponding improvements to the technical problems mentioned in the background technology.

[0052] As a further limitation of the sealing mechanism 2 of the present invention, the adsorption unit 22 includes a sealing gasket 2201, which is slidably connected to the inner wall of the valve seat 4. There are two sealing gaskets 2201. By setting the sealing gasket 2201, the close contact between the valve ball 5 can be enhanced to make its sealing better.

[0053] One end of the telescopic rod 2113 is fixedly connected to the surface of the sealing gasket 2201, and one end of the piston tube 2101 is fixedly connected to the intake pipe 2202. There are four intake pipes 2202. One end of the intake pipe 2202 penetrates the inner wall of the valve seat 4 and is fixedly connected to the inner cavity of the sealing gasket 2201. When the piston tube 2101 cooperates with the first piston block 2105 to deliver air, the inner cavity space of the piston tube 2101 on the other side of the first piston block 2105 will generate negative pressure and achieve the effect of exhausting air, which can achieve the effect of delivering air and exhausting air at the same time. When exhausting air, the air in the sealing gasket 2201 will be gradually emptied through the intake pipe 2202.

[0054] The inner cavity of the sealing gasket 2201 is fixedly connected with a shaping plate 2203, and there are two shaping plates 2203. The inner cavity of the sealing gasket 2201 is provided with air holes 2204, and the air holes 2204 extend to the surface of the sealing gasket 2201. There are several air holes 2204. By setting the shaping plates 2203, the elastic sealing gasket 2201 can be effectively prevented from being squeezed by the valve ball 5 and undergoing serious physical deformation, and the sealing gasket 2201 can always have a certain inner cavity space.

[0055] An elastic diaphragm 2205 is fixedly connected to the inner wall of the air hole 2204. The elastic diaphragm 2205 is made of a rubber material with a certain elasticity. When the sealing gasket 2201 is in close contact with the surface of the valve ball 5, the air in the sealing gasket 2201 is evacuated to generate a negative pressure in its inner cavity. At this time, the elastic diaphragm 2205 made of a rubber material with a certain elasticity will expand in the reverse direction on the inner wall of the air hole 2204, and a certain vacuum area can be generated between the elastic diaphragm 2205, the sealing gasket 2201 and the valve ball 5. At this time, the vacuum area generated by the reverse expansion of the elastic diaphragm 2205 cooperates with the sealing gasket 2201, and a certain suction force can be generated on the surface of the valve ball 5.

[0056] The inner wall of the shaping plate 2203 is fixedly connected with a partition plate 2206, and the inner wall of the shaping plate 2203 is fixedly connected with a baffle plate 2207. The number of baffle plates 2207 is several. The partition plate 2206 and the baffle plate 2207 divide the inner cavity of the sealing gasket 2201 into chambers of the same size. The chambers adjacent to the partition plate 2206 on the left and right are respectively fixedly connected to one end of the suction pipe 2202. When the air in the sealing gasket 2201 is gradually evacuated through the suction pipe 2202, the chambers adjacent to the partition plate 2206 on the left and right are respectively connected to one end of the suction pipe 2202. The two ends are fixedly connected, and two exhaust channels are formed in the sealing gasket 2201. Because the valve ball 5 is spherical, when the valve ball 5 rotates and contacts the sealing gasket 2201, one side of the sealing gasket 2201 will be contacted first. At this time, when the sealing gasket 2201 and the air hole 2204 on one side are in complete contact with the elastic diaphragm 2205, the two channels will continue to evacuate air, which can prevent water or other substances from entering between the sealing gasket 2201, the air hole 2204, the elastic diaphragm 2205 and the valve ball 5, and avoid the occurrence of loose suction.

[0057] A cross silicone valve 2208 is fixedly connected to the inner wall of the baffle 2207. There are several cross silicone valves 2208. When the two channels are continuously evacuated, the cross silicone valve 2208 can be used to gradually complete the evacuation operation in each chamber, thereby further avoiding the reverse expansion of the elastic diaphragm 2205 that has not yet contacted the valve ball 5, and avoiding water or other substances from entering between the sealing gasket 2201, the air hole 2204, the elastic diaphragm 2205 and the valve ball 5.

[0058] The specific implementation of this embodiment is as follows: by setting the sealing gasket 2201, the close contact between the valve ball 5 can be enhanced to make it more sealed. When the piston tube 2101 cooperates with the first piston block 2105 to deliver air, the inner cavity space of the piston tube 2101 on the other side of the first piston block 2105 will generate negative pressure and achieve the effect of exhausting air, which can achieve the effect of delivering air while exhausting air. When exhausting air, the air in the sealing gasket 2201 will be gradually evacuated through the suction pipe 2202. By setting the shaping plate 2203, the elastic sealing gasket 2201 can be effectively prevented from leaking. 01 is squeezed by the valve ball 5 and undergoes severe physical deformation, which can ensure that there is always a certain inner cavity space in the sealing gasket 2201. At this time, the elastic diaphragm 2205 made of rubber material with a certain elasticity will expand in the opposite direction on the inner wall of the air hole 2204, and a certain vacuum area can be generated between the elastic diaphragm 2205, the sealing gasket 2201 and the valve ball 5. At this time, the vacuum area generated by the reverse expansion of the elastic diaphragm 2205 cooperates with the sealing gasket 2201 to generate a certain suction force on the surface of the valve ball 5, and the air is gradually evacuated through the suction pipe 2202. When the air in the sealing gasket 2201 is completely in contact with the air hole 2204 on one side and the elastic diaphragm 2205, the two channels will continue to be evacuated, which can avoid the sealing gasket 2201, the air hole 2204 and the elastic diaphragm 2205 from contacting each other. Water or other substances enter between the diaphragm 2205 and the valve ball 5 to avoid the occurrence of weak suction. The two channels will continue to evacuate air, and the cross silicone valve 2208 can be used to gradually complete the evacuation operation in each chamber, further avoiding the reverse expansion of the elastic diaphragm 2205 that has not yet contacted the valve ball 5, and avoiding water or other substances from entering between the sealing gasket 2201, the air hole 2204, the elastic diaphragm 2205 and the valve ball 5. In key systems such as nuclear power plants, better sealing can ensure strict control and safety of medium flow. Example

[0059] See also Figure 1-15 The present invention provides a technical solution: a ball valve with a valve seat 4 bidirectional sealing structure for nuclear power. The present invention makes corresponding improvements to the technical problems mentioned in the background technology.

[0060] As a further limitation of the auxiliary mechanism 3 of the present invention, the auxiliary mechanism 3 includes a first gear 301, which is fixedly sleeved on the surface of the transmission rod 6, and the inner wall of the valve body 1 is rotatably connected with a positioning rod 302, and the number of the positioning rods 302 is two. The bottom of the positioning rod 302 is fixedly connected with a second gear 303, and the second gear 303 is meshed with the first gear 301, and the second gear 303 is meshed with the moving tooth plate 2102. The inner wall of the valve body 1 is fixedly connected with a sliding rod 304, and the surface of the sliding rod 304 contacts the inner wall of the moving tooth plate 2102. The surface of the connecting plate 2103 is fixedly connected with a sliding plate 305, and the number of the sliding plates 305 is two. The inner wall of the valve body 1 is fixedly connected with a sliding rod 306, and the number of the sliding rods 306 is two, and the sliding plate 305 is sleeved on the surface of the sliding rod 306.

[0061] The specific implementation of this embodiment is as follows: when the user closes the valve body 1, the transmission rod 6 rotates and drives the valve ball 5 to rotate. The surface of the valve ball 5 contacts the sealing gasket 2201 to complete the sealing. At the same time, the rotation of the transmission rod 6 will drive the first gear 301 fixed on its surface to rotate. The rotation of the first gear 301 drives the second gear 303 to rotate, and then drives the movable tooth plate 2102 meshing with it to move. By setting the sliding rod 304, the movable tooth plate 2102 can be made more stable when moving, and play a guiding role, thereby increasing the stability of the movable tooth plate 2102 when moving. By setting the sliding plate 305 and the sliding rod 306, the connecting plate 2103 can be made more stable when moving, and play a guiding role, thereby increasing the stability of the connecting plate 2103 and the movable tooth plate 2102 when moving.

[0062] A sealing method for a ball valve with a valve seat 4 bidirectional sealing structure for nuclear power, comprising the following steps:

[0063] S1: When the user closes the valve body 1, the transmission rod 6 rotates and drives the valve ball 5 to rotate. The surface of the valve ball 5 contacts the sealing gasket 2201 to complete the sealing. At the same time, the rotation of the transmission rod 6 drives the first gear 301 fixed on its surface to rotate. The rotation of the first gear 301 drives the positioning rod 302 and the second gear 303 to rotate, thereby driving the movable tooth plate 2102 meshing with it to move;

[0064] S2: When the movable tooth plate 2102 moves, it will drive the first piston block 2105 to slide on the inner wall of the piston tube 2101 through the piston rod 2104. At this time, the air in the piston tube 2101 is squeezed and squeezed into the annular cavity 2109 through the delivery pipe 2106, the adapter pipe head 2107 and the connecting pipe 2108. Then the air will enter the slide groove 2112 and the air groove hole 2116 through the short tube 2111. The continuous input of air will squeeze the second piston block 2115 to slide on the inner wall of the piston groove 2114, and the second piston block 2115 will drive the output end of the telescopic rod 2113 to continuously press the sealing gasket 2201 forward, so that it can tightly contact the surface of the valve ball 5, thereby enhancing the sealing effect;

[0065] S3: When the piston tube 2101 cooperates with the first piston block 2105 to deliver air, the inner cavity space of the piston tube 2101 on the other side of the first piston block 2105 will generate negative pressure and achieve the effect of exhausting air, which can achieve the effect of delivering air and exhausting air at the same time. When exhausting air, the air in the sealing gasket 2201 will be gradually evacuated through the suction pipe 2202, and the connecting plate 2103 moves to drive the rubber sealing gasket 2117 to move to one end of the piston tube 2101 and contact it closely, which can avoid leakage at the connection between the piston rod 2104 and the piston tube 2101, and increase the sealing effect of the piston tube 2101;

[0066] S4: When the sealing gasket 2201 is in close contact with the surface of the valve ball 5, the air in the sealing gasket 2201 is evacuated to generate negative pressure in its inner cavity. At this time, the elastic diaphragm 2205 made of rubber material with a certain elasticity will expand in the opposite direction on the inner wall of the air hole 2204, and a certain vacuum area can be generated between the elastic diaphragm 2205, the sealing gasket 2201 and the valve ball 5. At this time, the vacuum area generated by the reverse expansion of the elastic diaphragm 2205 cooperates with the sealing gasket 2201, and a certain suction force can be generated on the surface of the valve ball 5. When the suction force cooperates with the forward top pressure generated by the output end of the telescopic rod 2113, the sealing gasket 2201 can be further firmly fixed on the surface of the valve ball 5, and the overall sealing effect can be further enhanced.

[0067] S5: When the air in the sealing gasket 2201 is gradually evacuated through the suction pipe 2202, the adjacent chambers on the left and right of the partition plate 2206 are fixedly connected to one end of the suction pipe 2202 respectively, and two exhaust channels are formed in the sealing gasket 2201. Because the valve ball 5 is spherical, when the valve ball 5 rotates and contacts the sealing gasket 2201, one side of the sealing gasket 2201 will be contacted first. At this time, when the sealing gasket 2201 and the air hole 2204 on one side are completely in contact with the elastic diaphragm 2205, the two channels will continue to evacuate air, which can avoid the sealing gasket 2201, Water or other substances enter between the air hole 2204 and the elastic diaphragm 2205 and the valve ball 5 to avoid the occurrence of weak suction. The two channels will continue to evacuate air, and the cross silicone valve 2208 can gradually complete the evacuation operation in each chamber, further avoiding the reverse expansion of the elastic diaphragm 2205 that has not yet contacted the valve ball 5, and avoiding water or other substances from entering between the sealing gasket 2201, the air hole 2204, the elastic diaphragm 2205 and the valve ball 5. In key systems such as nuclear power plants, better sealing can ensure strict control and safety of medium flow.

[0068] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ball valve for nuclear power with a valve seat bidirectional sealing structure, comprising a valve body (1), characterized in that: Both sides of the valve body (1) are fixedly connected to valve seats (4), the inner wall of the valve body (1) is rotatably connected to a valve ball (5), the top of the valve ball (5) is fixedly connected to a transmission rod (6), and the inner wall of the valve body (1) is provided with a sealing mechanism (2); The sealing mechanism (2) comprises a pressing unit (21), wherein the pressing unit (21) is arranged on the inner wall of the valve body (1), and the pressing unit (21) is used for enhancing the operation of the sealing structure; The sealing mechanism (2) further comprises an adsorption unit (22), wherein the adsorption unit (22) is arranged on one side of the valve body (1), and the adsorption unit (22) is used to further enhance the operation of the sealing structure; The inner wall of the valve body (1) is provided with an auxiliary mechanism (3), and the auxiliary mechanism (3) is used for assisting the operation of the sealing structure; The top pressure unit (21) comprises a piston tube (2101), wherein the piston tube (2101) is fixedly connected to the inner wall of the valve body (1), and the number of the piston tubes (2101) is four. The inner wall of the valve body (1) is provided with a movable tooth plate (2102), and the number of the movable tooth plates (2102) is two. The bottom of the movable tooth plate (2102) is fixedly connected to a connecting plate (2103), and the surface of the connecting plate (2103) is fixedly connected to two piston rods (2104), and the surface of the connecting plate (2103) is fixedly connected to a rubber sealing pad (2117), and the rubber sealing pad (2117) is sleeved on the surface of the piston rod (2104) and is in close contact with the piston rod (2104). One end of the piston rod (2104) passes through the inner cavity of the piston tube (2101), and one end of the piston rod (2104) is fixedly connected to a first piston block (2105). The surface of the first piston block (2105) is in close contact with the inner cavity of the piston tube (2101). One side of the valve body (1) is fixedly connected to a delivery pipe (2106). One end of the delivery pipe (2106) passes through the inner wall of the valve body (1) and is fixedly connected to the inner cavity of the piston tube (2101). There are four delivery pipes (2106). One end of every two delivery pipes (2106) is fixedly connected to a transfer pipe connector (2107). The surface of the transfer pipe connector (2107) is fixedly connected to A connecting pipe (2108), the number of the connecting pipes (2108) is two, the surface of the valve seat (4) is provided with an annular cavity (2109), one end of the connecting pipe (2108) is fixedly connected to the inner cavity of the annular cavity (2109), the surface of the valve seat (4) is fixedly connected with a hexagonal column (2110), the annular cavity (2109) is fixedly connected to the surface of the valve seat (4) through the hexagonal column (2110), the surface of the annular cavity (2109) is fixedly connected with a short pipe (2111), the number of the short pipes (2111) is several, the inner wall of the valve seat (4) is provided with a slide groove (2112), the number of the slide groove (2112) is several, The inner wall of the valve seat (4) is provided with a piston groove (2114), the slide groove (2112) is connected to the piston groove (2114), the inner wall of the valve seat (4) is provided with an air groove hole (2116), the number of the air groove holes (2116) is several, each of the air groove holes (2116) is connected to the slide groove (2112), one end of the short tube (2111) penetrates the inner wall of the air groove hole (2116), the inner wall of the slide groove (2112) is fixedly connected with a telescopic rod (2113), the surface of the telescopic rod (2113) is fixedly sleeved with a second piston block (2115), and the surface of the second piston block (2115) is in close contact with the inner wall of the piston groove (2114); The adsorption unit (22) comprises a sealing gasket (2201), wherein the sealing gasket (2201) is slidably connected to the inner wall of the valve seat (4), and the number of the sealing gaskets (2201) is two; One end of the telescopic rod (2113) is fixedly connected to the surface of the sealing gasket (2201), and one end of the piston tube (2101) is fixedly connected to an air intake pipe (2202). The number of the air intake pipes (2202) is four, and one end of the air intake pipe (2202) penetrates the inner wall of the valve seat (4) and is fixedly connected to the inner cavity of the sealing gasket (2201); The auxiliary mechanism (3) comprises a first gear (301), the first gear (301) is fixedly sleeved on the surface of the transmission rod (6), the inner wall of the valve body (1) is rotatably connected to a positioning rod (302), the number of the positioning rods (302) is two, the bottom of the positioning rod (302) is fixedly connected to a second gear (303), the second gear (303) is meshed with the first gear (301), and the second gear (303) is meshed with the movable tooth plate (2102). The inner wall of the valve body (1) is fixedly connected with a sliding rod (304), the surface of the sliding rod (304) contacts the inner wall of the movable tooth plate (2102), the surface of the connecting plate (2103) is fixedly connected with a sliding plate (305), the number of the sliding plates (305) is two, the inner wall of the valve body (1) is fixedly connected with a sliding rod (306), the number of the sliding rods (306) is two, and the sliding plate (305) is sleeved on the surface of the sliding rod (306).

2. A ball valve with a valve seat bidirectional sealing structure for nuclear power according to claim 1, characterized in that: The inner cavity of the sealing gasket (2201) is fixedly connected to a shaping plate (2203), and the number of the shaping plates (2203) is two. The inner cavity of the sealing gasket (2201) is provided with air holes (2204), and the air holes (2204) extend to the surface of the sealing gasket (2201), and the number of the air holes (2204) is several.

3. A ball valve with a valve seat bidirectional sealing structure for nuclear power according to claim 2, characterized in that: An elastic diaphragm (2205) is fixedly connected to the inner wall of the air hole (2204), and the elastic diaphragm (2205) is made of a rubber material with a certain elasticity.

4. A ball valve with a valve seat bidirectional sealing structure for nuclear power according to claim 2, characterized in that: The inner wall of the shaping plate (2203) is fixedly connected with a partition plate (2206), and the inner wall of the shaping plate (2203) is fixedly connected with a baffle plate (2207). There are a plurality of baffle plates (2207). The partition plate (2206) and the baffle plate (2207) divide the inner cavity of the sealing gasket (2201) into chambers of the same size, and the chambers adjacent to the partition plate (2206) on the left and right are respectively fixedly connected to one end of the intake pipe (2202).

5. A ball valve with a valve seat bidirectional sealing structure for nuclear power according to claim 4, characterized in that: A cross silicone valve (2208) is fixedly connected to the inner wall of the baffle (2207), and the number of the cross silicone valves (2208) is several.

6. A sealing method for a ball valve with a valve seat bidirectional sealing structure for nuclear power according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: When the user closes the valve body (1), the transmission rod (6) rotates and drives the valve ball (5) to rotate. The surface of the valve ball (5) contacts the sealing gasket (2201) to complete the sealing. At the same time, the rotation of the transmission rod (6) drives the first gear (301) fixedly mounted on its surface to rotate. The rotation of the first gear (301) drives the positioning rod (302) and the second gear (303) to rotate, thereby driving the movable toothed plate (2102) meshing therewith to move. S2: When the movable tooth plate (2102) moves, it will drive the first piston block (2105) to slide on the inner wall of the piston tube (2101) through the piston rod (2104). At this time, the air in the piston tube (2101) is squeezed and squeezed into the annular cavity (2109) through the delivery pipe (2106), the adapter pipe head (2107) and the connecting pipe (2108). Then, the air will enter the slide groove (2112) and the air groove hole (2116) through the short tube (2111). The continuous input of air will squeeze the second piston block (2115) to slide on the inner wall of the piston groove (2114), and the second piston block (2115) will drive the output end of the telescopic rod (2113) to continuously press the sealing gasket (2201) forward, so that it can tightly contact the surface of the valve ball (5), thereby enhancing the sealing effect; S3: When the piston tube (2101) cooperates with the first piston block (2105) to deliver air, the inner cavity space of the piston tube (2101) on the other side of the first piston block (2105) will generate negative pressure and achieve the effect of exhausting air, which can achieve the effect of delivering air and exhausting air at the same time. When exhausting air, the air in the sealing gasket (2201) will be gradually evacuated through the suction pipe (2202), and the connecting plate (2103) moves to drive the rubber sealing gasket (2117) to move to one end of the piston tube (2101) and closely contact it, which can avoid leakage at the connection between the piston rod (2104) and the piston tube (2101), thereby increasing the sealing effect of the piston tube (2101); S4: When the sealing gasket (2201) is in close contact with the surface of the valve ball (5), the air in the sealing gasket (2201) is evacuated, which will cause negative pressure in its inner cavity. At this time, the elastic diaphragm (2205) made of rubber material with a certain elasticity will expand in the opposite direction on the inner wall of the pore (2204), and a certain vacuum area can be generated between the elastic diaphragm (2205), the sealing gasket (2201) and the valve ball (5). At this time, the vacuum area generated by the reverse expansion of the elastic diaphragm (2205) cooperates with the sealing gasket (2201), which can generate a certain suction force on the surface of the valve ball (5). When the suction force cooperates with the forward pressing force generated by the output end of the telescopic rod (2113), the sealing gasket (2201) can be further firmly fixed on the surface of the valve ball (5), thereby further enhancing the overall sealing effect. S5: When the air in the sealing gasket (2201) is gradually evacuated through the suction pipe (2202), the adjacent chambers on the left and right of the partition plate (2206) are fixedly connected to one end of the suction pipe (2202), respectively. At this time, two exhaust channels are formed in the sealing gasket (2201). Because the valve ball (5) is spherical, when the valve ball (5) rotates and contacts the sealing gasket (2201), one side of the sealing gasket (2201) will be contacted first. At this time, when the sealing gasket (2201) and the air hole (2204) on one side are completely in contact with the elastic diaphragm (2205), the two channels will continue to evacuate air, which can avoid the sealing gasket (220 1) Water or other substances enter between the air hole (2204), the elastic diaphragm (2205) and the valve ball (5), so as to avoid the occurrence of weak suction. When the two channels are continuously evacuated, the cross silicone valve (2208) can be used to gradually complete the evacuation operation in each chamber, further avoiding the phenomenon of reverse expansion of the elastic diaphragm (2205) that has not yet contacted the valve ball (5), and avoiding the entry of water or other substances between the sealing gasket (2201), the air hole (2204), the elastic diaphragm (2205) and the valve ball (5). In key systems such as nuclear power plants, better sealing can ensure strict control and safety of medium flow.

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