Foreign matter prevention device
By designing a foreign object anti-invasive device including airbags, horn-shaped baffles and support, the safety hazards of foreign objects falling when the existing device is deflated and recovered, the effect of preventing foreign objects falling is achieved, and the safety of nuclear power plant equipment is improved.
Patent Information
- Application Number
- CN202421269094.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-06-05
AI Technical Summary
When the existing anti-foreign object device deflates the airbag and recovers foreign objects, it is easy for undiscovered foreign objects on the edge of the airbag to fall into the main pump of the nuclear island, causing safety hazards.
A foreign object prevention device is designed, including an airbag, a trumpet-shaped baffle and a support member. The baffle has a first opening and a second opening. The airbag inflatable is opposite to the inner wall of the connecting pipe. The support member prevents the baffle from contracting as the airbag deflated and prevents foreign objects from falling.
By installing support members to prevent the baffle from shrinking, foreign matters are effectively prevented from falling from the gap between the baffle and the inner wall of the connecting pipe, and the safe and stable operation of nuclear power plant equipment is improved.
Smart Images
Figure CN222927210U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of in-service inspection of nuclear power plants, in particular to a foreign object prevention device. Background Art
[0002] The coolant main pump in the nuclear island of a large pressurized water reactor nuclear power plant is directly suspended below the lower head of the steam generator. Its pump casing is connected to the outlet nozzle of the steam generator through a connecting weld, which is called the connecting weld between the outlet nozzle of the steam generator and the main pump and is one of the important special structures of the nuclear power plant. The nuclear island main pump is the only active rotating equipment in the main loop of the nuclear power plant, and its stable operation is related to the safety of the entire nuclear power plant. Therefore, it is necessary to conduct pre-service and in-service inspections on the connecting weld between the outlet nozzle of the steam generator and the main pump.
[0003] When inspecting the weld, it is necessary to set up a device to prevent foreign objects from falling in the connecting pipe between the steam generator and the nuclear island main pump to prevent foreign objects from entering the nuclear island main pump and affecting its normal operation. In the prior art, the device for preventing foreign objects from falling is just an airbag. During operation, the airbag is inflated so that it supports against the inner wall of the lower head nozzle. After the work is completed, the airbag is first deflated, and then the airbag and the collected foreign objects are taken out together. However, when the airbag is deflated, due to the shrinkage of the airbag during deflation, it is easy for the undetected foreign objects at the edge of the airbag to fall into the nuclear island main pump, posing a major hidden danger to the subsequent safe and stable operation.
[0004] Therefore, there is an urgent need for a foreign object prevention device to solve the above technical problems. Summary of the Utility Model
[0005] The purpose of the utility model is to provide a foreign object prevention device that can prevent foreign objects from falling when the foreign object prevention device is recovered.
[0006] To achieve the above purpose, the utility model adopts the following technical solutions:
[0007] A foreign object prevention device, the steam generator is communicated with the nuclear main pump through a connecting pipe, the foreign object prevention device is arranged in the connecting pipe, and includes: an airbag, a baffle and a support member. The baffle is in a horn shape, the baffle has a first opening and a second opening, the outer diameter of the first opening is larger than the outer diameter of the second opening, one end of the baffle with the first opening can abut against the inner wall of the connecting pipe, one end of the baffle with the second opening is connected to the airbag, the airbag can abut against the inner wall of the connecting pipe when inflated, and the support member is arranged between the outer side walls of the airbag and the baffle.
[0008] As a preferred technical solution of the above foreign object prevention device, the foreign object prevention device further includes a filter screen, the airbag is in a ring shape, and the outer circumference of the filter screen is connected to the inner ring of the airbag.
[0009] As a preferred technical solution of the above anti-foreign object device, the anti-foreign object device further includes a lifting ring assembly, which is installed on the airbag and is used to lift the anti-foreign object device.
[0010] As a preferred technical solution of the above anti-foreign object device, the lifting ring assembly includes a plurality of pull rings and a pull rope. The plurality of pull rings are evenly connected to the inner circle of the airbag along the circumferential direction, and the pull rope can connect the plurality of pull rings simultaneously.
[0011] As a preferred technical solution of the above anti-foreign object device, the anti-foreign object device further includes a protective sleeve. The airbag and the support member are arranged in the protective sleeve, and the baffle is connected to the protective sleeve.
[0012] As a preferred technical solution of the above anti-foreign object device, the anti-foreign object device further includes an anti-slip member, which is arranged on the outer side wall of the protective sleeve.
[0013] As a preferred technical solution of the above anti-foreign object device, the anti-foreign object device further includes an air nozzle, which passes through the baffle and is communicated with the airbag.
[0014] As a preferred technical solution of the above anti-foreign object device, the anti-foreign object device further includes an air pipe, which is communicated with the air nozzle.
[0015] As a preferred technical solution of the above anti-foreign object device, the airbag is made of rubber.
[0016] As a preferred technical solution of the above anti-foreign object device, the baffle is made of plastic.
[0017] Advantages of the present utility model:
[0018] The present utility model provides an anti-foreign object device. The steam generator is communicated with the nuclear main pump through a connecting pipe. The anti-foreign object device is arranged in the connecting pipe. The anti-foreign object device includes: an airbag, a baffle and a support member. The baffle is in a horn shape and has a first opening and a second opening. The outer diameter of the first opening is larger than the outer diameter of the second opening. One end of the baffle with the first opening can abut against the inner wall of the connecting pipe, and one end of the baffle with the second opening is connected to the airbag. The airbag can be inflated to abut against the inner wall of the connecting pipe. The support member is arranged between the outer side walls of the airbag and the baffle. By arranging the support member to support the baffle, it can prevent the baffle from shrinking as the airbag deflates, and can avoid foreign objects from falling through the gap between the baffle and the inner wall of the connecting pipe. Description of the Drawings
[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.
[0020] Figure 1 Structural schematic diagram of the working state of the foreign object prevention device provided by the embodiment of the present invention;
[0021] Figure 2 Structural schematic diagram of the foreign object prevention device provided by the embodiment of the present invention;
[0022] Figure 3 Cross-sectional view of the foreign object prevention device provided by the embodiment of the present invention.
[0023] In the figure:
[0024] 1. Steam generator; 101. Manhole; 2. Connecting pipe; 3. Nuclear main pump; 4. Airbag; 5. Baffle; 6. Support member; 7. Filter net; 8. Pull ring; 9. Protective sleeve; 10. Air nozzle; 11. Air pipe. Specific embodiments
[0025] The following will further elaborate on the present invention in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only the parts related to the present invention rather than all the structures are shown in the drawings.
[0026] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0027] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly under and obliquely under the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.
[0028] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left" and "right" are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0029] As Figures 1 to 3 shown, the present utility model provides an anti-foreign object device. The steam generator 1 is communicated with the nuclear main pump 3 through a connecting pipe 2. The anti-foreign object device is arranged in the connecting pipe 2. The anti-foreign object device includes: an airbag 4, a baffle 5 and a support member 6.
[0030] Specifically, the baffle 5 is of a flared structure. The baffle 5 has a first opening and a second opening. The diameter of the first opening is larger than that of the second opening. One end of the baffle 5 with the first opening can abut against the inner wall of the connecting pipe 2. One end of the baffle 5 with the second opening is connected to the airbag 4. When the airbag 4 is inflated, it can abut against the inner wall of the connecting pipe 2. The support member 6 is arranged between the outer side walls of the airbag 4 and the baffle 5. By arranging the support member 6 to support the baffle 5, it can prevent the baffle 5 from shrinking as the airbag 4 deflates, and can avoid foreign objects from falling through the gap between the baffle 5 and the inner wall of the connecting pipe 2.
[0031] Preferably, the anti-foreign object device further includes a filter net 7. The airbag 4 is of an annular structure. The outer periphery of the filter net 7 is connected to the inner ring of the airbag 4. Specifically, the anti-foreign object device is provided with a filter net 7, and the airbag 4 is of an annular structure. Connecting the outer periphery of the filter net 7 to the inner ring of the airbag 4 can prevent foreign objects from entering the nuclear main pump 3, and at the same time allow the liquid to flow in, which helps to carry out various detections.
[0032] Optionally, the anti-foreign object device is provided with a double-layer filter net 7. The double-layer filter nets 7 are arranged at intervals, which can effectively prevent foreign objects from entering the nuclear main pump 3.
[0033] Optionally, the filter net 7 is made of a polyester material with high water permeability, which enables the liquid for auxiliary detection to smoothly pass through the filter net 7.
[0034] Preferably, the foreign object prevention device further includes a lifting ring assembly, which is installed on the airbag 4 and used to lift the foreign object prevention device. Specifically, in order to facilitate the smooth entry and exit of the foreign object prevention device from the connecting pipe 2, the foreign object prevention device is provided with a lifting ring assembly, which is connected to the airbag 4. The staff can lower the foreign object prevention device to a suitable position of the connecting pipe 2 through the lifting ring assembly. After the detection work is completed, the staff can pull out the foreign object prevention device through the lifting ring assembly.
[0035] Optionally, the lifting ring assembly includes a plurality of pull rings 8 and a pull rope. The plurality of pull rings 8 are evenly connected to the inner ring of the airbag 4 along the circumferential direction, and the pull rope can connect the plurality of pull rings 8 simultaneously. Specifically, in order to ensure the balanced force when the foreign object prevention device is pulled out, the lifting ring assembly is provided with a plurality of pull rings 8. The plurality of pull rings 8 are evenly installed on the inner ring of the airbag 4 along the circumferential direction, and the pull rope connects the plurality of pull rings 8 simultaneously. In this way, it can ensure the balanced force of the foreign object device, ensure that the baffle 5 abuts against the inner wall of the connecting pipe 2, and prevent foreign objects from falling into the nuclear main pump 3 through the gap between the baffle 5 and the inner wall of the connecting pipe 2. In this embodiment, the lifting ring assembly includes three pull rings 8. Of course, in some other embodiments, the number of pull rings 8 is determined according to actual needs and will not be elaborated here. Preferably, the foreign object prevention device further includes a protective sleeve 9. The airbag 4 and the support member 6 are arranged inside the protective sleeve 9, and the baffle 5 is connected to the protective sleeve 9. Specifically, in order to protect the airbag 4 and prevent it from bursting, the foreign object prevention device is provided with a protective sleeve 9. The protective sleeve 9 wraps the airbag 4 and the support member 6 to prevent the airbag 4 from directly contacting the inner wall of the connecting pipe 2; the inner wall of the protective sleeve 9 has the same shape and structure as the outer wall of the baffle 5, and the baffle 5 is installed on the inner wall of the protective sleeve 9, which can make foreign objects fall into the filter net 7 and avoid foreign objects from falling into the nuclear main pump 3.
[0036] Optionally, in order to improve the firmness of the connection between the baffle 5 and the protective sleeve 9, in this embodiment, the baffle 5 and the protective sleeve 9 are sewn together with a nylon rope. Of course, in some other embodiments, the baffle 5 and the protective sleeve 9 can also be bonded.
[0037] Optionally, in order to improve the firmness of the connection between the pull ring 8 and the protective sleeve 9, the pull ring 8 and the protective sleeve 9 are sewn together with a nylon rope.
[0038] Optionally, in order to improve the firmness of the connection between the support member 6 and the protective sleeve 9, the support member 6 is bonded to the inner side of the protective sleeve 9.
[0039] Preferably, in order to increase the friction between the foreign object prevention device and the inner wall of the connecting pipe 2, the outer side wall of the protective sleeve 9 is provided with a friction increasing member. In this way, after the airbag 4 is inflated, it can increase the friction between the protective sleeve 9 and the inner wall of the connecting pipe 2 and prevent the foreign object prevention device from falling into the nuclear main pump 3.
[0040] Optionally, the protective cover 9 is a leather case, which has the characteristics of being soft, wear-resistant, and having good mechanical properties, can improve the service life of the protective cover 9, and can also change with the volume change of the airbag 4.
[0041] Preferably, the foreign object prevention device further includes an air nozzle 10, and the air nozzle 10 penetrates through the baffle 5 and communicates with the airbag 4. Specifically, in order to facilitate inflation of the airbag 4, an air nozzle 10 is provided at the top of the airbag 4, and the air nozzle 10 penetrates through the protective cover 9 and the baffle 5 and is exposed.
[0042] Optionally, the air nozzle 10 is threadedly connected to the airbag 4, which is convenient for replacing the air nozzle 10.
[0043] Preferably, the foreign object prevention device further includes an air pipe 11, and both ends of the air pipe 11 are respectively connected to the air nozzle 10 and the inflation device, and can inflate and deflate the airbag 4 stably.
[0044] Preferably, the airbag 4 is made of rubber. Specifically, the airbag 4 is supported by nitrile rubber and has the characteristic of high airtightness to prevent the airbag 4 from leaking air.
[0045] Preferably, the baffle 5 is made of plastic. Specifically, the baffle 5 is supported by PC / ABS plastic. PC / ABS plastic has the characteristics of being thin and light, can reduce the weight of the foreign object prevention device, and avoid the foreign object prevention device from sliding down due to excessive self-weight; PC / ABS plastic has the characteristics of being compression-resistant and impact-resistant, can improve the service life of the baffle 5; PC / ABS plastic has the characteristics of being waterproof and oil-proof, and can prevent the baffle 5 from spontaneous combustion.
[0046] Preferably, in order to reduce the weight of the foreign object prevention device, the support member 6 is made of POM plastic, which not only reduces the weight of the support member 6 and realizes the lightweight of the foreign object prevention device, but also has relatively high strength of POM plastic, which improves the service life of the support member 6.
[0047] The present utility model provides a foreign object prevention device, which can meet the foreign object prevention requirements for the on-site detection device of important nuclear power equipment. The device has the advantages of simple structure, easy production and manufacturing, good interchangeability, stable performance, convenient disassembly and assembly, convenient maintenance, and simple and safe operation. The use process of the device is as follows:
[0048] During operation, the foreign object prevention device enters the steam generator 1 from the manhole 101. After entering the working position, the inflation device is started to inflate the airbag 4 to the required air pressure. After the airbag 4 expands, its outer diameter is slightly larger than the inner diameter of the pipeline. Therefore, by means of the pressure generated by the airbag 4 on the inner diameter of the pipeline and the friction force between the protective cover 9 and the inner wall of the connecting pipe 2, the foreign object prevention device is fixed in the connecting pipe 2; at the same time, after the airbag 4 is inflated, the filter net 7 connected thereto also expands, and the baffle 5 also expands and abuts against the inner wall of the connecting pipe 2. At this time, the entire foreign object prevention device works normally.
[0049] After the work is completed, the inflating device releases the gas in the airbag 4, and the airbag 4 becomes soft. The entire foreign object prevention device shrinks slightly towards the center. However, under the action of the support member 6 and the baffle 5, the entire device can maintain a regular shape, so that the baffle 5 always abuts against the inner wall of the connecting pipe 2, and the entire foreign object prevention device is smoothly removed through the hanging ring assembly.
[0050] In addition, the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.
Claims
1. A foreign body prevention device, wherein a steam generator (1) is connected to a nuclear main pump (3) via a connecting pipe (2), and the foreign body prevention device is arranged in the connecting pipe (2), characterized in that: include: An airbag (4), a baffle (5) and a support member (6), wherein the baffle (5) is trumpet-shaped and has a first opening and a second opening, wherein the outer diameter of the first opening is greater than the outer diameter of the second opening, and one end of the baffle (5) having the first opening can abut against the inner wall of the connecting tube (2), and one end of the baffle (5) having the second opening is connected to the airbag (4), and the airbag (4) can abut against the inner wall of the connecting tube (2) when inflated, and the support member (6) is arranged between the outer side walls of the airbag (4) and the baffle (5).
2. The foreign body prevention device according to claim 1, characterized in that: The anti-foreign matter device also includes a filter screen (7), the air bag (4) is annular, and the outer periphery of the filter screen (7) is connected to the inner circle of the air bag (4).
3. The foreign body prevention device according to claim 2, characterized in that: The anti-foreign-object device also includes a lifting ring assembly, which is installed on the airbag (4) and is used to lift the anti-foreign-object device.
4. The foreign body prevention device according to claim 3, characterized in that: The lifting ring assembly comprises a plurality of pull rings (8) and a pull rope, wherein the plurality of pull rings (8) are evenly connected to the inner ring of the airbag (4) along the circumferential direction, and the pull rope can simultaneously connect the plurality of pull rings (8).
5. The foreign body prevention device according to claim 1, characterized in that: The anti-foreign matter device also includes a protective cover (9), the airbag (4) and the support member (6) are arranged in the protective cover (9), and the baffle (5) is connected to the protective cover (9).
6. The foreign body prevention device according to claim 5, characterized in that: The anti-foreign matter device also includes a friction-enhancing component, which is arranged on the outer side wall of the protective sleeve (9).
7. The foreign body prevention device according to claim 1, characterized in that: The anti-foreign-object device further comprises an air nozzle (10), wherein the air nozzle (10) passes through the baffle (5) and is in communication with the air bag (4).
8. The foreign body protection device according to claim 7, characterized in that: The foreign body prevention device further comprises an air pipe (11), wherein the air pipe (11) is in communication with the air nozzle (10).
9. A foreign body protection device according to any one of claims 1 to 8, characterized in that: The airbag (4) is a rubber part.
10. The foreign body protection device according to any one of claims 1 to 8, characterized in that: The baffle (5) is made of plastic.