A sealing device for nuclear power plant

Abstract

The invention discloses a silicone rubber seal and a device for sealing a nuclear power plant, belonging to the technical field of sealing. The silicone rubber used to prepare the silicone rubber seal is prepared from the following raw materials in parts by weight: methyl vinyl silicone rubber: 100 parts; white carbon black: 5 to 10 parts; cerium oxide: 1 to 2 parts; flame retardant: 20 to 30 parts; lead powder: 10 to 20 parts. The silicone rubber seal has the functions of radiation resistance, high temperature resistance and fire prevention; the silicone rubber seal is applied to the device for sealing a nuclear power plant, including a hole plugging device for plugging holes in the nuclear power plant, and a pipe hole plugging device for plugging pipe through holes in the nuclear power plant; the hole plugging device and the pipe hole plugging device can ensure the sealing of the nuclear power plant; by setting a hole outlet and a plugging member facing downward, compared with the prior art, the plugging effect of the plugging member is better, the plugging member is more convenient to open or close, and the opening and closing switching can be easier and more reliable.

Description

Technical Field

[0001] The invention relates to the technical field of sealing, and in particular to a sealing device used in a nuclear power plant. Background Art

[0002] Silicone rubber is an excellent special rubber with superior high and low temperature resistance. It is widely used in medical, transportation, electronic appliances and current aerospace materials. In view of the use requirements of nuclear power plants, silicone rubber seals are used for sealing, and there are very high requirements for the seals' thermal insulation, radiation shielding, fire resistance and high temperature resistance.

[0003] The patent with publication number CN103938899B discloses a method for plugging holes outside a nuclear power plant, wherein the plugging device includes a plugging plate, a rotating positioning mechanism and a sensor; the plugging plate is pivotally mounted in the external hole through the rotating positioning mechanism; the sensor monitors the temperature and pressure inside the nuclear power plant, and transmits the monitoring results to the rotating positioning mechanism, and the rotating positioning mechanism drives the plugging plate to rotate according to the received sensor monitoring results, so as to adjust the opening and closing state and the opening angle of the plugging plate; the plugging method is to install the plugging device in the external hole, and adjust the opening and closing state and the opening angle of the plugging plate according to the sensing signal of the sensor. Compared with the prior art, the present invention can effectively ensure that the nuclear power plant can meet the insulation and ventilation requirements of its internal systems and equipment under normal working conditions, and can meet the pressure relief requirements of its internal systems and equipment when a pipeline rupture occurs or under special working conditions, providing technical support for ensuring the safe and stable operation of the nuclear power plant.

[0004] However, the plugging device uses a rotary positioning mechanism to rotate the plugging plate to close and open the hole, and the plugging plate is not in close contact with the sealing member, resulting in relatively poor sealing performance;

[0005] The holes through which the steam pipes enter the nuclear power plant were not sealed, which affected the pressure inside the nuclear power plant. When sealing the holes in the steam pipes of the nuclear power plant, maintenance was inconvenient. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a sealing device for a nuclear power plant to solve the problem raised in the background technology, with good sealing performance and convenient maintenance.

[0007] In order to solve the above technical problems, the technical solution of the present invention is:

[0008] A sealing device for a nuclear power plant, the device comprising a hole plugging device for plugging holes in the nuclear power plant, and a pipeline hole plugging device for plugging pipeline through holes in the nuclear power plant, and a sensor arranged inside the nuclear power plant;

[0009] The hole plugging device comprises a hole plugging shell arranged at a hole of a nuclear power plant, the hole plugging shell is arranged on a wall of the nuclear power plant, and a first silicone rubber seal is arranged between the hole plugging shell and the wall of the nuclear power plant;

[0010] The hole plugging shell is provided with a hole outlet, a plugging component is provided at the hole outlet, a second silicone rubber seal is provided in the hole plugging shell, and the plugging component is in contact with the second silicone rubber seal;

[0011] The blocking assembly includes a blocking member, the blocking member is connected to a pushing member, the pushing member is arranged on a frame, and the pushing direction of the pushing member is toward the hole outlet;

[0012] The hole plugging shell is provided with a hole entrance, one end of the hole entrance is connected to the wall of the nuclear power plant, the direction of the hole exit is perpendicular to the direction of the hole entrance, and the hole exit faces downward;

[0013] The pipeline hole plugging device comprises a third silicone rubber seal arranged in the pipeline hole, a limiting retaining ring is arranged on one side of the third silicone rubber seal, a propulsion retaining ring is arranged on the other side of the third silicone rubber seal, and a propulsion retaining ring limiting assembly is arranged on the side of the propulsion retaining ring away from the third silicone rubber seal;

[0014] The outer side wall of the third silicone rubber seal is in contact with the inner side wall of the pipeline hole, and the inner side wall of the third silicone rubber seal is sleeved on the pipeline;

[0015] The limit stop ring is arranged on one side of the pipeline hole facing the inside of the nuclear power plant, one side of the limit stop ring contacts the third silicone rubber seal, and the other side of the limit stop ring is provided with a baffle, which is arranged on the inner side of the wall of the nuclear power plant;

[0016] The thrust retaining ring limiter assembly comprises a thrust retaining ring limiter, the thrust retaining ring limiter is provided with a through hole for the pipeline to pass through, one end of the thrust retaining ring limiter contacts the thrust retaining ring so as to compress the third silicone rubber seal to maintain sealing performance, an outer wall of the thrust retaining ring limiter is provided with an external thread section, an outer wall of the nuclear power plant is provided with a mounting tube, the mounting tube is provided with an inner hole, and an inner thread section matching the external thread section is provided in the inner hole;

[0017] The silicone rubber used to prepare the first silicone rubber seal, the second silicone rubber seal and the third silicone rubber seal is prepared from the following raw materials in parts by weight:

[0018] Methyl vinyl silicone rubber: 100 parts;

[0019] White carbon black: 5 to 10 parts;

[0020] Cerium oxide: 1 to 2 parts;

[0021] Flame retardant: 20 to 30 parts;

[0022] Lead powder: 10 to 20 parts.

[0023] The above technical solution has the following beneficial effects:

[0024] White carbon black, cerium oxide, flame retardant and lead powder are added to the silicone rubber used to prepare the silicone rubber seal, so that the silicone rubber seal ring has good elasticity, radiation resistance, high temperature resistance and fire resistance, and can meet the use of silicone rubber seals in nuclear power plant scenarios;

[0025] Through the hole plugging device and the pipeline hole plugging device, the sealing of the nuclear power plant can be ensured when it is closed;

[0026] A push-in retaining ring and a limit retaining ring are provided, and the push-in retaining ring limiter pushes the push-in retaining ring to compress the third silicone rubber seal, so that the inner ring of the third silicone rubber seal fits tightly with the steam pipe, and when the side wall of the pipe hole has an irregular shape, the outer ring fits tightly with the side wall of the pipe hole to ensure airtightness;

[0027] By providing a downward hole outlet and a blocking piece, compared with the prior art, the blocking piece has a better blocking effect, is more convenient to open or close, and can be switched on and off more easily and reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic cross-sectional view of the structure of a hole plugging device of a sealing device of a nuclear power plant in which the silicone rubber sealing member of the present invention is applied;

[0029] Figure 2 The present invention is a schematic cross-sectional structural diagram of a pipe hole plugging device in which the silicone rubber seal of the present invention is applied to a sealing device of a nuclear power plant. DETAILED DESCRIPTION

[0030] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] In one aspect, the present invention discloses a silicone rubber seal. The silicone rubber used to prepare the silicone rubber seal is prepared from the following raw materials in parts by weight:

[0032] Methyl vinyl silicone rubber: 100 parts;

[0033] White carbon black: 5 parts;

[0034] Cerium oxide: 1 part;

[0035] Flame retardant: 20 parts;

[0036] Lead powder: 10 parts.

[0037] In other implementations of this embodiment:

[0038] The silicone rubber used to prepare the silicone rubber seal is prepared from the following raw materials in parts by weight:

[0039] Methyl vinyl silicone rubber: 100 parts;

[0040] White carbon black: 10 parts;

[0041] Cerium oxide: 2 parts;

[0042] Flame retardant: 30 parts;

[0043] Lead powder: 20 parts.

[0044] Adding white carbon black, cerium oxide, flame retardant and lead powder to the silicone rubber used in the preparation of silicone rubber seals makes the silicone rubber seal ring have good elasticity, radiation resistance, high temperature resistance and fire resistance.

[0045] The silicone rubber seal prepared by the above-mentioned component materials can be a circular seal ring or a square seal ring. The specific shape is set according to the place of use. The prepared seal can meet the requirements of use in nuclear power plants.

[0046] refer to Figure 1 and Figure 2 , Figure 1 is a schematic diagram of the cross-sectional structure of the hole plugging device, Figure 2 It is a schematic cross-sectional structure diagram of a pipeline hole plugging device. On the other hand, the present invention discloses a device for applying a silicone rubber seal to a nuclear power plant seal, the device comprising a hole plugging device for plugging holes in the nuclear power plant, and a pipeline hole plugging device for plugging a hole through which a pipeline 10 of the nuclear power plant passes;

[0047] The hole plugging device comprises a hole plugging shell 2 arranged at a hole of a nuclear power plant, the hole plugging shell 2 is arranged on a wall 1 of the nuclear power plant, and a first silicone rubber seal 3 is arranged between the hole plugging shell 2 and the wall 1 of the nuclear power plant. By arranging the first silicone rubber seal 3, the hole plugging shell 2 and the wall 1 of the nuclear power plant are more tightly combined, and the sealing performance can be guaranteed when the nuclear power plant needs to be sealed. The first silicone rubber seal 3 is made of the above silicone rubber, has good elasticity, and has the functions of radiation resistance, high temperature resistance, and fire prevention, and can meet the use needs in the nuclear power plant;

[0048] The hole plugging shell 2 is provided with a hole outlet 21, and the hole outlet 21 is used to release the pressure in the nuclear power plant. A plugging component is provided at the hole outlet 21, and the plugging component is used to plug the hole outlet 21 to maintain the pressure in the nuclear power plant, or to release the pressure as needed. The plugging component can adjust its relative position with the hole outlet 21 as needed. A second silicone rubber seal 5 is provided in the hole plugging shell 2. The second silicone rubber seal 5 is made of the above-mentioned silicone rubber, has good elasticity, and has the functions of radiation resistance, high temperature resistance, and fire prevention, and can meet the use needs in the nuclear power plant. When the pressure in the nuclear power plant needs to be maintained, the plugging component contacts the second silicone rubber seal 5 to ensure the sealing inside the nuclear power plant. The second silicone rubber seal 5 has an inner ring and an outer ring, and its inner ring is used to communicate with the outside when the pressure is released. If the pressure is released, the plugging component is at a certain distance from the hole outlet 21 to release the pressure;

[0049] The second silicone rubber seal 5 is installed at the hole outlet 21. When the plugging component is adjusted, it gradually contacts the second silicone rubber seal 5 until a certain pressure is applied to the second silicone rubber seal 5, and the seal is maintained under the elasticity of the second silicone rubber seal 5.

[0050] The plugging assembly includes a plugging member 8, which is connected to a push member 9. The push member 9 is arranged on the frame 4. The push direction of the push member 9 is toward the hole outlet 21. The push member 9 can be a telescopic rod. By extending and retracting the telescopic rod, the position between the plugging member 8 and the hole outlet 21 can be adjusted to meet the pressure relief or sealing requirements of the nuclear power plant. When the sensor senses that the internal pressure of the nuclear power plant is too high, the telescopic rod retracts, the plugging member 8 is separated from the hole outlet 21, and the hole outlet 21 is depressurized. When the nuclear power plant needs to be sealed, the telescopic rod is extended to make the plugging member 8 contact with the second silicone rubber seal 5 to seal. The hole outlet 21 is blocked, and the shape of the plugging member 8 is the same as that of the hole outlet 21, and the size is smaller than the hole outlet 21, so that the plugging member 8 can contact with the second silicone rubber seal 5 arranged on the inner wall of the hole blocking shell 2. The hole blocking shell 2 is provided with a protrusion 6 for installing the second silicone rubber seal 5, and the second silicone rubber seal 5 is provided with a groove matched with the protrusion 6, which is used to install the second silicone rubber seal 5 on the inner wall of the hole blocking shell 2. When in use, the plugging member 8 presses the second silicone rubber seal 5, and the pressure acts on the protrusion 6, so that the sealing performance is good and the connection is reliable;

[0051] The hole plugging shell 2 is provided with a hole entrance 20, one end of which is connected to the wall of the nuclear power plant, and the direction of the hole outlet 21 is perpendicular to the direction of the hole entrance 20, and the hole outlet 21 is downward. The direction of the hole entrance 20 can be horizontal, and the hole outlet 21 is downward. When in use, it can prevent rainwater or debris from entering the nuclear power plant through the hole. The hole outlet 21 is downward for easy use with the plugging piece 8. If the nuclear power plant has multiple holes, two or more plugging pieces 8 can be connected to a push piece 9, so as to simultaneously control multiple plugging pieces 8 to plug multiple hole outlets 21, which is more cost-effective. The edge of the hole outlet 21 is provided with a flared opening 7 that gradually increases outward. If the position of the hole plugging shell 2 is partially changed after being used for a period of time, the position of the plugging piece 8 can be guided so that the plugging piece 8 can contact the second silicone rubber seal 5.

[0052] The pipeline hole plugging device includes a third silicone rubber seal 12 arranged in the pipeline hole. The third silicone rubber seal 12 is made of the above silicone rubber, has good elasticity, and has the functions of radiation resistance, high temperature resistance, and fire resistance, and can meet the use needs in nuclear power plants. A limit retaining ring 11 is provided on one side of the third silicone rubber seal 12, and a push retaining ring 13 is provided on the other side of the third silicone rubber seal 12. The limit retaining ring 11 and the push retaining ring 13 are sleeved on the pipeline 10 when the pipeline 10 is installed, and the push retaining ring 13 is provided on the side away from the third silicone rubber seal 12. The third silicone rubber seal 12 is an annular structure, the inner side wall of which is fitted with the outer side wall of the pipe 10, and the outer side wall of which is fitted with the side wall of the pipe 10. The push-up retaining ring 13 limiting assembly acts on the push-up retaining ring 13, and the push-up retaining ring 13 applies pressure to the third silicone rubber seal 12. The position of the third silicone rubber seal 12 is limited by the limiting retaining ring 11. Under the action of pressure, the third silicone rubber seal 12 is compressed and deformed, so that its inner side wall is fitted with the outer side wall of the pipe 10, and its outer side wall is fitted with the hole of the pipe to meet the sealing needs;

[0053] Since the pipe 10 is a steam pipe, it needs to be heated for a long time and contact the third silicone rubber seal 12. On the one hand, the third silicone rubber seal 12 is required to be resistant to high temperature. Therefore, the third silicone rubber seal 12 may include a first ring layer and a second ring layer, wherein the outer ring side wall of the first ring layer is connected to the inner ring side wall of the second ring layer, wherein the inner ring side wall of the first ring layer contacts the pipe 10, and the outer ring side wall of the second ring layer contacts the side wall of the pipe 10. The white carbon black content in the first ring layer is higher than that in the second ring layer, so that the side of the pipe 10 that contacts the higher temperature can be more resistant to high temperature. On the other hand, the third silicone rubber seal 12 needs to be easily replaced. The third silicone rubber seal 12 may be in a broken form. The third silicone rubber seal 12 has a fracture, which can be easily put on the pipe 10. After installation, under the action of pressure, the third silicone rubber seal 12 is squeezed by force, and its cross section is also squeezed against each other, so that the cross section fits tightly together, ensuring the sealing performance, and it is also very convenient to replace the third silicone rubber seal 12.

[0054] The outer wall of the third silicone rubber seal 12 contacts the inner wall of the pipeline hole. The inner wall of the third silicone rubber seal 12 is sleeved on the pipeline 10. By squeezing the third silicone rubber seal 12, the inner wall of the third silicone rubber seal 12 is tightly fitted with the pipeline 10 due to its elasticity. When the shape of the inner wall of the pipeline hole is irregular, the outer wall of the third silicone rubber seal 12 is tightly fitted with the inner wall of the pipeline hole, thereby ensuring the sealing of the nuclear power plant, plugging the pipeline hole, and using it together with the plugging component to ensure the overall sealing of the nuclear power plant;

[0055] The limit retaining ring 11 is arranged on one side of the pipeline hole facing the inside of the nuclear power plant, one side of the limit retaining ring 11 contacts the third silicone rubber seal 12, and the other side of the limit retaining ring 11 is provided with a baffle 19, which is arranged on the inner side of the nuclear power plant wall 1, and is used to block the position of the limit retaining ring 11. The baffle 19 is fixedly installed inside the nuclear power plant, and the limit assembly of the push retaining ring 13 is arranged on the other side, which can facilitate the installation and replacement of the third silicone rubber seal 12 from the outside of the nuclear power plant;

[0056] The push-stop ring 13 limiting assembly includes a push-stop ring limiting member 14. A plurality of push handles 18 are provided on the outer wall of the push-stop ring limiting member 14 to facilitate rotation when installing the push-stop ring limiting member 14. A through hole for the pipeline 10 to pass through is provided on the push-stop ring limiting member 14. One end of the push-stop ring limiting member 14 contacts the push-stop ring 13 to compress the third silicone rubber seal 12 to maintain sealing. An external thread section 15 is provided on the outer wall of the push-stop ring limiting member 14. A mounting tube 16 is provided on the outer wall of the nuclear power plant. The mounting tube 16 is provided with an inner hole. An internal thread section 17 cooperating with the external thread section 15 is provided in the inner hole. The push-stop ring limiting member 14 is installed in the mounting tube through a threaded connection. 16, it is easy to install and disassemble. During installation, the push-blocking ring limiter 14 is screwed into the third silicone rubber seal 12, and the force acts on the third silicone rubber seal 12 to press the third silicone rubber seal 12. The third silicone rubber seal 12 is sealed under the action of pressure, and the reaction force acts on the push-blocking ring limiter 14 at the same time, so that the relative position between the push-blocking ring limiter 14 and the installation tube 16 remains unchanged, which can prevent the push-blocking ring limiter 14 from loosening. If the push-blocking ring limiter 14 is found to be loose, it means that the elasticity of the third silicone rubber seal 12 is insufficient, and it needs to be replaced so that the third silicone rubber seal 12 has sufficient elasticity to maintain the seal;

[0057] Adding white carbon black, cerium oxide, flame retardant and lead powder to the silicone rubber used in the preparation of silicone rubber seals makes the silicone rubber seal ring have good elasticity, radiation resistance, high temperature resistance and fire resistance.

[0058] The hole plugging device and the pipe hole plugging device can ensure the sealing of the nuclear power plant when it is closed. When it is necessary to release the pressure or adjust the internal pressure of the nuclear power plant, it can be done through the hole plugging device;

[0059] A push-in baffle ring 13 and a limit baffle ring 11 are provided, and the push-in baffle ring limiter 14 pushes the push-in baffle ring 13 to compress the third silicone rubber seal 12, so that the inner ring of the third silicone rubber seal 12 fits tightly with the steam pipe 10. When the side wall of the pipe hole has an irregular shape, the outer ring fits tightly with the side wall of the pipe hole to ensure airtightness;

[0060] By setting a downward hole outlet 21 and a sealing member 8, compared with the prior art, the sealing member 8 has a better sealing effect, is more convenient to open or close, and can be switched on and off more easily and reliably. When the hole outlet 21 needs to be closed, it is used in conjunction with the second silicone rubber sealing member 5, and the sealing is more reliable.

[0061] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A sealing device for a nuclear power plant, characterized in that: The device includes a hole plugging device for plugging holes in a nuclear power plant, and a pipe hole plugging device for plugging pipe passage holes in a nuclear power plant, and a sensor arranged inside the nuclear power plant; The hole plugging device comprises a hole plugging shell arranged at a hole of a nuclear power plant, the hole plugging shell is arranged on a wall of the nuclear power plant, and a first silicone rubber seal is arranged between the hole plugging shell and the wall of the nuclear power plant; The hole plugging shell is provided with a hole outlet, a plugging component is provided at the hole outlet, a second silicone rubber seal is provided in the hole plugging shell, and the plugging component is in contact with the second silicone rubber seal; The blocking assembly includes a blocking member, the blocking member is connected to a pushing member, the pushing member is arranged on a frame, and the pushing direction of the pushing member is toward the hole outlet; The hole plugging shell is provided with a hole entrance, one end of the hole entrance is connected to the wall of the nuclear power plant, the direction of the hole exit is perpendicular to the direction of the hole entrance, and the hole exit faces downward; The pipeline hole plugging device comprises a third silicone rubber seal arranged in the pipeline hole, a limiting retaining ring is arranged on one side of the third silicone rubber seal, a propulsion retaining ring is arranged on the other side of the third silicone rubber seal, and a propulsion retaining ring limiting assembly is arranged on the side of the propulsion retaining ring away from the third silicone rubber seal; The outer side wall of the third silicone rubber seal is in contact with the inner side wall of the pipeline hole, and the inner side wall of the third silicone rubber seal is sleeved on the pipeline; The limit stop ring is arranged on one side of the pipeline hole facing the inside of the nuclear power plant, one side of the limit stop ring contacts the third silicone rubber seal, and the other side of the limit stop ring is provided with a baffle, which is arranged on the inner side of the wall of the nuclear power plant; The thrust retaining ring limiter assembly comprises a thrust retaining ring limiter, the thrust retaining ring limiter is provided with a through hole for the pipeline to pass through, one end of the thrust retaining ring limiter contacts the thrust retaining ring so as to compress the third silicone rubber seal to maintain sealing performance, an outer wall of the thrust retaining ring limiter is provided with an external thread section, an outer wall of the nuclear power plant is provided with a mounting tube, the mounting tube is provided with an inner hole, and an inner thread section matching the external thread section is provided in the inner hole; The silicone rubber used to prepare the first silicone rubber seal, the second silicone rubber seal and the third silicone rubber seal is prepared from the following raw materials in parts by weight: Methyl vinyl silicone rubber: 100 parts; White carbon black: 5 to 10 parts; Cerium oxide: 1 to 2 parts; Flame retardant: 20 to 30 parts; Lead powder: 10 to 20 parts.

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