Nuclear power station nuclear island equipment cooling method and overflow pipe sealing and communicating device

Abstract

The invention relates to the technical field of nuclear power station nuclear island equipment cooling, in particular to a nuclear power station nuclear island equipment cooling method and an overflow pipe sealing and communicating device. Comprising a fluctuation box, an equipment cooling water pump arranged on one side of the fluctuation box, an equipment cooling water user arranged on one side of the equipment cooling water pump, an exhaust pipe and an overflow pipe, compared with the prior art, the cooling water system of the M310 nuclear island equipment is simple in structure and easy to implement, the cooling water system of the M310 nuclear island equipment in service is easy to reform, the cooling water system of the M310 nuclear island equipment in service can be recycled, and the cooling water system of the M310 nuclear island equipment in service can be recycled. On-site power connection and a control system do not need to be additionally arranged, by means of the sealing device, the workload of system maintenance of operators and the waste liquid discharge amount can be reduced, and the problem of carbonation of cooling water in a cold water system of equipment is solved.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant nuclear island equipment cooling technology, and in particular to a nuclear power plant nuclear island equipment cooling method and an overflow pipe sealing and connecting device. Background Technology

[0002] The nuclear island equipment cooling water system is a crucial nuclear auxiliary system in a nuclear power plant and one of the systems related to nuclear safety. Its primary safety function, under normal operation and accident conditions, is to transfer heat from critical safety-related rooms, systems, and equipment within the nuclear island to the final heat sink—seawater—alongside the important plant water system. From a radiation safety perspective, when the cooled heat exchangers are potentially contaminated, the equipment cooling water system acts as an intermediate medium to prevent the release of radioactive fluids into the sea. To prevent corrosion of materials within the equipment cooling water system, corrosion inhibitors are added. In China's operating M310 units, alkaline phosphate is commonly used for corrosion prevention, with the system pH typically controlled between 11.0 and 11.5. Because the equipment cooling water system is a nuclear safety-related system, its pH value must be continuously monitored and maintained within the standard range; corrective action must be taken if the pH value decreases.

[0003] Chemical corrective actions mainly involve adding chemicals to the system. When the phosphate concentration exceeds the standard range, cooling water replacement is necessary, resulting in the discharge of phosphate-containing wastewater. As emission standards for phosphates and other substances become increasingly stringent in coastal provinces of my country, corrective actions taken by nuclear power plants will be further constrained. There is an urgent need for a cooling method for nuclear power plant nuclear island equipment that can solve the problem of carbonation in the cooling water system of the equipment, is easy to modify the existing cooling water system of the M310 nuclear island equipment, does not require the installation of on-site power connection and control system, and can reduce the workload of system maintenance personnel and the amount of waste liquid discharged. At the same time, it is difficult to quickly seal and connect some overflow pipes in the equipment during use, which affects the efficiency of the unit and causes great inconvenience. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems that have occurred in the use of existing nuclear island equipment cooling water systems, this invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a cooling method for nuclear island equipment in a nuclear power plant.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for cooling equipment in the nuclear island of a nuclear power plant, comprising a structural component, the structural component including a pulsating tank, an equipment cooling water pump disposed on one side of the pulsating tank, an equipment cooling water user disposed on one side of the equipment cooling water pump, and a heat exchanger disposed on one side of the equipment cooling water user;

[0008] The structural components also include an exhaust pipe and an overflow pipe disposed on one side of the oscillating chamber;

[0009] The structural components also include an air extraction branch pipe and a drainage branch pipe disposed on one side of the overflow pipe, a pit disposed on the lower side of the drainage branch pipe, and a mechanical sealing device disposed in the air extraction branch pipe and the drainage branch pipe.

[0010] The fluctuation box is connected to the equipment cooling water pump, equipment cooling water user, heat exchanger, etc. via pipelines;

[0011] An exhaust pipe is installed on the top of the fluctuating box, which leads the exhaust from the fluctuating box to the ventilation system of the nuclear auxiliary plant.

[0012] The overflow pipe enters from the bottom of the oscillating box, and the overflow pipe below the oscillating box branches into an air extraction branch pipe and a drainage branch pipe;

[0013] The drainage branch pipes are arranged in an "N" shaped bend, with the outlet of the drainage branch pipe located above the pit. Both the air extraction branch pipe and the drainage branch pipe are equipped with mechanical seals.

[0014] As a preferred embodiment of the cooling method for nuclear island equipment in a nuclear power plant according to the present invention, wherein: when the water level in the fluctuation tank decreases, the sealing device in the air extraction branch pipe opens under the action of air pressure to replenish air into the fluctuation tank.

[0015] As a preferred embodiment of the cooling method for nuclear island equipment in a nuclear power plant according to the present invention, when the water level in the fluctuation tank rises, the sealing device in the drainage branch pipe is opened under water pressure, and the excess water in the fluctuation tank will be discharged to the pit through the drainage branch pipe.

[0016] In a preferred embodiment of the cooling method for nuclear island equipment in a nuclear power plant according to the present invention, the interface between the extraction branch pipe and the overflow pipe is higher than the interface between the drainage branch pipe and the overflow pipe.

[0017] The beneficial effects of the cooling method for nuclear island equipment in nuclear power plants described in this invention are as follows: Compared with the prior art, the structure of this invention is simple and easy to implement, and it is easy to modify the cooling water system of the existing M310 nuclear island equipment. There is no need to install on-site power connection and control system. By using this sealing device, the workload of system maintenance personnel and the amount of waste liquid discharge can be reduced, and the problem of carbonation of cooling water inside the equipment cooling water system can be solved.

[0018] In actual use, there is still a problem that it is difficult to quickly seal and connect some overflow pipes in the equipment, which affects the efficiency of the device.

[0019] To solve the above-mentioned technical problems, the present invention also provides the following technical solution: an overflow pipe sealing and connecting device, including the above-mentioned nuclear power plant nuclear island equipment cooling method, including a connecting component, including a connecting member, an insert, a pressing member and a snap-fit ​​member, wherein the insert is disposed on one side of the connecting member, the pressing member is disposed on the outside of the connecting member, and the snap-fit ​​member is disposed on one side of the pressing member;

[0020] A sealing assembly includes a seal disposed within a connecting member and a sliding member disposed outside the seal;

[0021] The sealing element includes a sealing tube disposed inside the water supply pipe and a through hole opened on the circumferential side of the sealing tube;

[0022] The sliding component includes a sealing block slidably disposed on the outside of the sealing tube. The sliding component also includes a protrusion disposed on one side of the sealing block and a tension spring disposed on one side of the sealing block. The two ends of the tension spring are respectively connected to one side of an arc-shaped block on one side of the sealing block.

[0023] As a preferred embodiment of the overflow pipe sealing and connecting device of the present invention, the connecting element includes a water supply pipe and a connecting pipe, and the connecting element further includes an installation sleeve disposed on the outside of the water supply pipe.

[0024] As a preferred embodiment of the overflow pipe sealing and connecting device of the present invention, the insert includes a retaining hole opened on the outside of the connecting pipe, and the insert also includes a wedge-shaped portion opened on one side of the connecting pipe and an annular groove opened on the outside of the connecting pipe.

[0025] In a preferred embodiment of the overflow pipe sealing and connecting device of the present invention, the extrusion member includes an annular fixing plate slidably disposed on the outside of the connecting member and a sliding tube slidably disposed on the outside of the connecting member, and the extrusion member includes an annular fixing plate disposed on the outside of the mounting sleeve and a sliding rod disposed on one side of the annular fixing plate.

[0026] The extrusion component also includes a sliding tube slidably disposed on the outside of the slide rod and a return spring sleeved on the outside of the slide rod. The two ends of the return spring are respectively connected to one side of the annular fixing plate and one side of the sliding tube. The extrusion component also includes a limiting plate disposed on the outside of the mounting sleeve.

[0027] In a preferred embodiment of the overflow pipe sealing and connecting device of the present invention, the fastening member includes a locking block disposed on one side of the sliding pipe, the locking block extending into the locking hole and slidably disposed therewith, the fastening member also includes a mounting plate disposed on the outside of the sliding column and a compression spring sleeved on the outside of the sliding column, the two ends of the compression spring being connected to one side of the sliding pipe and one side of the mounting plate, respectively.

[0028] In a preferred embodiment of the overflow pipe sealing and connecting device of the present invention, the sealing element further includes an inclined portion disposed on one side of the arc-shaped block and a sealing gasket disposed on one side of the inclined portion, wherein the inclined portion and the wedge-shaped portion are matched with each other.

[0029] The beneficial effects of the overflow pipe sealing and connecting device of the present invention are as follows: The present invention, through the setting of the connecting component, including a connecting member, an insert, a pressing member, and a snap-fit ​​member, wherein the insert is set on one side of the connecting member, the pressing member is set on the outside of the connecting member, and the snap-fit ​​member is set on one side of the pressing member, and the sealing component, including a sealing member set in the connecting member and a sliding member set on the outside of the sealing member, can facilitate the rapid sealing and connecting of part of the pipe during the use of the device, reducing the inconvenience of existing equipment that is difficult to quickly seal and connect the overflow pipe in the equipment during use, thereby affecting the efficiency of the device. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0031] Figure 1 This is a schematic diagram of the structure of the present invention.

[0032] Figure 2 This is a schematic diagram of the structure of the connecting component in this invention.

[0033] Figure 3 This is a schematic diagram of the insert in the present invention.

[0034] Figure 4 This is a schematic diagram of the fastener structure in this invention.

[0035] Figure 5 This is a front view of the connected component in this invention.

[0036] Figure 6 This is a schematic diagram of the sealing assembly in this invention.

[0037] Figure 7 This is a cross-sectional view of the sealing assembly in this invention.

[0038] Figure 8 This is a schematic diagram of the sealing element in this invention.

[0039] Figure 9 for Figure 7 Enlarged view of the structure at point A in the middle. Detailed Implementation

[0040] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0043] Example 1

[0044] Reference Figure 1 - Figure 6 This is the first embodiment of the present invention. This embodiment provides a method for cooling equipment in the nuclear island of a nuclear power plant, including a structural component 100, including a structural member 101. The structural member 101 includes a pulsating tank 101a, an equipment cooling water pump 101b disposed on one side of the pulsating tank 101a, an equipment cooling water user disposed on one side of the equipment cooling water pump 101b, and a heat exchanger 101d disposed on one side of the equipment cooling water user. The structural member 101 also includes an exhaust pipe 101e and an overflow pipe 101f disposed on one side of the pulsating tank 101a. The structural member 101 also includes an extraction branch pipe 101g disposed on one side of the overflow pipe 101f, a drainage branch pipe 101h, a pit 101i disposed below the drainage branch pipe 101h, and a mechanical seal device 101j disposed in the extraction branch pipe 101g and the drainage branch pipe 101h.

[0045] S1: The oscillating box 101a is connected to the equipment cooling water pump 101b, the equipment cooling water user, the heat exchanger 101d, etc. via pipes;

[0046] S2: An exhaust pipe 101e is installed on the top of the fluctuation box 101a. The exhaust pipe 101e leads the exhaust of the fluctuation box 101a to the ventilation system of the nuclear auxiliary plant.

[0047] S3: Overflow pipe 101f enters from the bottom of the oscillating box 101a, and the overflow pipe 101f below the oscillating box 101a branches into an air extraction branch pipe 101g and a drainage branch pipe 101h.

[0048] S4: The drainage branch pipe 101h is arranged in an "N" shaped bend. The outlet of the drainage branch pipe 101h is located above the pit 101i. Both the air extraction branch pipe 101g and the drainage branch pipe 101h are equipped with mechanical seal devices 101j.

[0049] Specifically, when the water level in the fluctuation tank 101a decreases, the sealing device in the air extraction branch pipe 101g opens under air pressure, replenishing air into the fluctuation tank 101a. When the water level in the fluctuation tank 101a rises, the sealing device in the drainage branch pipe 101h opens under water pressure, and excess water in the fluctuation tank 101a is discharged to the pit 101i through the drainage branch pipe 101h. The interface between the air extraction branch pipe 101g and the overflow pipe 101f is higher than the interface between the drainage branch pipe 101h and the overflow pipe 101f.

[0050] Operating Procedure: First, before shutting down the equipment cooling water system, prepare the relevant materials and equipment, including the extraction branch pipe 101g, the drainage branch pipe 101h, and the mechanical seal device 101j; after shutting down the equipment cooling water system, cut the overflow pipe 101f according to... Figure 1 The extraction branch pipe 101g, drainage branch pipe 101h, and overflow pipe 101f are welded together. The lower ends of the extraction branch pipe 101g and drainage branch pipe 101h are both located above the pit 101i. The interface between the extraction branch pipe 101g and the overflow pipe 101f is higher than the interface between the drainage branch pipe 101h and the overflow pipe 101f. After the pipeline is installed, a system debugging test is conducted. When the water level in the fluctuation tank 101a decreases, the sealing device in the extraction branch pipe 101g can be opened under air pressure to replenish air into the fluctuation tank 101a. When the water level in the fluctuation tank 101a rises, the sealing device in the drainage branch pipe 101h needs to be opened under water pressure, and the excess water in the fluctuation tank 101a will be discharged into the pit 101i through the drainage branch pipe 101h.

[0051] Example 2

[0052] Reference Figure 2 - Figure 8This is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a sealing and connecting device for an overflow pipe 101f, including the above-mentioned cooling method for nuclear island equipment in a nuclear power plant. It includes a connecting component 200, comprising a connecting member 201, an insert 202, a pressing member 203, and a snap-fit ​​member 204. The insert 202 is disposed on one side of the connecting member 201, the pressing member 203 is disposed on the outside of the connecting member 201, and the snap-fit ​​member 204 is disposed on one side of the pressing member 203. A sealing component 300 includes a sealing member 301 disposed within the connecting member 201 and a sliding member 302 disposed on the outside of the sealing member 301. It also includes a sealing component 300 comprising a sealing member 301 disposed within the connecting member 201 and a sliding member 302 disposed on the outside of the sealing member 301.

[0053] Furthermore, the connecting member 201 includes a water supply pipe 201a and a connecting pipe 201b, and the insert 202 includes a locking hole 202a opened on the outside of the connecting pipe 201b;

[0054] The pressing member 203 includes an annular fixing plate 203a slidably disposed on the outside of the connecting member 201 and a sliding tube 203b slidably disposed on the outside of the connecting member 201. The fastening member 204 includes a locking block 204a disposed on one side of the sliding tube 203b. The locking block 204a extends into the locking hole 202a and is slidably disposed therewith.

[0055] Specifically, the sealing element 301 includes a sealing tube 301a disposed inside the water supply pipe 201a and a through hole 301b opened on the peripheral side of the sealing tube 301a. The sliding element 302 includes a sealing block 302a slidably disposed outside the sealing tube 301a. The sealing tube 301a is disposed inside the water supply pipe 201a. Liquids such as water in the water supply pipe 201a squeeze the sealing block 302a inside the water supply pipe 201a, causing the sealing block 302a to slide and leak out through the through hole 301b. Then, it enters the sealing tube 301a through the through hole 301b and finally enters the connecting pipe 201b through the sealing tube 301a, thereby realizing the rapid connection of the pipeline.

[0056] Furthermore, the sealing element 301 also includes a mounting block 301c disposed on one side of the sealing tube 301a, an arc-shaped block 301d disposed on one side of the sealing tube 301a, and the sealing element 301 also includes a beveled portion 301e disposed on one side of the arc-shaped block 301d and a sealing gasket disposed on one side of the beveled portion 301e. The beveled portion 301e matches the wedge-shaped portion 202b. A mounting groove is also provided on one side of the sealing tube 301a, located below the arc-shaped block 301d. During the inward sliding of the connecting tube 201b, the wedge-shaped portion 302b disposed on one side of the connecting tube 201b... 02b first slides and presses against the inclined surface 301e on one side of the bow-shaped block 301d. During the sliding and pressing process, the sealing gasket set on the inclined surface 301e is pressed, thereby improving the sealing effect and also improving the clamping effect on the connecting tube 201b. When the card block 204a is inserted into the card hole 202a, the wedge-shaped part 202b on one side of the connecting tube 201b just slides to the part that is completely in contact with the inclined surface 301e on one side of the bow-shaped block 301d. At the same time, one side of the connecting tube 201b extends into the mounting groove inside the bow-shaped block 301d and is in contact with one side of the sealing tube 301a.

[0057] Furthermore, the sliding member 302 also includes a protrusion 302b disposed on one side of the sealing block 302a and a tension spring 302c disposed on one side of the sealing block 302a. The two ends of the tension spring 302c are respectively connected to one side of the arc-shaped block 301d on one side of the sealing block 302a. The tension spring 302c is used to reset the sealing block 302a. When the water supply pipe 201a stops supplying water, the sealing block 302a is reset. At this time, the sealing block 302a slides back to above the through hole 301b, blocking the through hole 301b and resealing the sealing pipe 301a. This can also prevent backflow. The height of the protrusion 302b on one side of the sealing block 302a is greater than the inner diameter of the water supply pipe 201a. When the sealing block 302a is reset, it is limited to reduce the possibility of it falling into the water supply pipe 201a.

[0058] The rest of the structure is the same as in Example 1.

[0059] Operation process: During installation, one end of the water supply pipe 201a is connected to the overflow pipe 101f. The other end of the connecting pipe 201b and the water supply pipe 201a are quickly connected through the connecting component 200. The wedge-shaped part 202b on one side of the connecting pipe 201b first slides and presses against the inclined part 301e on one side of the arc-shaped block 301d. During the sliding and pressing process, the sealing gasket on the inclined part 301e is pressed, thereby improving the sealing effect and also improving the clamping effect of the connecting pipe 201b. When the connecting component 200 is just fixedly connected to the water supply pipe 201a, the wedge-shaped part 202b on one side of the connecting pipe 201b slides to the part that is completely in contact with the inclined part 301e on one side of the arc-shaped block 301d. At the same time, one side of the connecting pipe 201b extends into the mounting groove inside the arc-shaped block 301d and connects with the sealing pipe 301b. When one side of 1a is fitted together, the water supply pipe 201a is activated, and the water flow presses against the sealing block 302a, causing the sealing block 302a to move, exposing the through hole 301b and then entering the sealing pipe 301a through the through hole 301b. Finally, it enters the connecting pipe 201b through the sealing pipe 301a, thus achieving rapid pipe connection. When the water supply pipe 201a is closed, the return spring 203d resets the sealing block 302a. At this time, the sealing block 302a slides back above the through hole 301b, blocking the through hole 301b and resealing the sealing pipe 301a, which also has the effect of preventing backflow. The height of the protrusion 302b on one side of the sealing block 302a is greater than the inner diameter of the water supply pipe 201a. When the sealing block 302a is reset, it is limited to reduce the possibility of it falling into the water supply pipe 201a.

[0060] Example 3

[0061] Reference Figure 1 - Figure 6 This is the third embodiment of the present invention. Unlike the previous embodiments, this embodiment provides an overflow pipe 101f sealing and connecting device, which includes the above-mentioned nuclear power plant nuclear island equipment cooling method, and also includes a connecting component 200, including a connecting member 201, an insert 202, a pressing member 203 and a fastening member 204. The insert 202 is disposed on one side of the connecting member 201, the pressing member 203 is disposed on the outside of the connecting member 201, and the fastening member 204 is disposed on one side of the pressing member 203.

[0062] Specifically, the connecting component 201 includes a water supply pipe 201a and a connecting pipe 201b. The insert 202 includes a locking hole 202a opened on the outside of the connecting pipe 201b. The fastening component 204 includes a locking block 204a disposed on one side of the sliding pipe 203b. The locking block 204a extends into the locking hole 202a and slides therewith. During the connection process, the locking block 204a extends into the locking hole 202a to quickly fix and install it. The number of locking holes 202a and locking blocks 204a is set to six and they are evenly distributed on the outside of the connecting pipe 201b and the sliding pipe 203b.

[0063] Furthermore, the connecting member 201 also includes an installation sleeve 201c disposed on the outside of the water supply pipe 201a. The installation sleeve 201c is used to install the extrusion member 203. The insert 202 also includes a wedge-shaped portion 202b opened on one side of the connecting pipe 201b and an annular groove 202c opened on the outside of the connecting pipe 201b.

[0064] Preferably, the pressing component 203 includes an annular fixing plate 203a disposed on the outside of the mounting sleeve 201c and a sliding rod 203c disposed on one side of the annular fixing plate 203a. The sliding rod 203c is used to limit the sliding tube 203b. The pressing component 203 also includes a sliding tube 203b slidably disposed on the outside of the sliding rod 203c and a return spring 203d sleeved on the outside of the sliding rod 203c. The two ends of the return spring 203d are respectively connected to one side of the annular fixing plate 203a and one side of the sliding tube 203b. The return spring 203d is used to provide a reverse pressing and rebound force to the sliding tube 203b, and to provide an inward pressing force after the buckle 204 is installed, thereby improving the installation stability of the buckle 204. The pressing component 203 also includes a limiting plate 203e disposed on the outside of the mounting sleeve 201c. The limiting plate 203e is used to limit the sliding tube 203b and reduce the possibility of detachment.

[0065] Furthermore, the fastener 204 includes a sliding post 204b slidably disposed on the outside of the sliding tube 203b and a locking block 204a disposed on one side of the sliding post 204b. The locking block 204a is a spherical locking block 204a, and the shape and radius of the locking block 204a match the locking hole 202a. The fastener 204 also includes a mounting plate 204c disposed on the outside of the sliding post 204b and a compression spring 204d sleeved on the outside of the sliding post 204b. The two ends of the compression spring 204d are respectively connected to one side of the sliding tube 203b and one side of the mounting plate 204c. The compression spring 204d is used to provide downward pressure on the locking block 204a, causing the locking block 204a to extend into the locking hole 202a and lock it in place. An anti-detachment plate is installed on the outer surface of the side of the sliding post 204b that does not extend into the sliding tube 203b. The anti-detachment plate can limit the sliding post 204b.

[0066] The rest of the structure is the same as in the embodiment.

[0067] Operation process: During installation, after inserting the connecting pipe 201b into the water supply pipe 201a, the locking block 204a is located in the annular groove 202c. Pulling the sliding pipe 203b causes the locking block 204a to move during its sliding motion. When it moves above the locking hole 202a, it is squeezed by the compression spring 204d, causing the locking block 204a to extend into the locking hole 202a for quick and secure installation. After the locking block 204a extends into the locking hole 202a, the sliding pipe 203b is subjected to the rebound force of the return spring 203d, which gives the sliding pipe 203b a force to move towards the annular fixing plate 203a. At this time, the locking block 204a in the locking hole 202a will give the connecting pipe 201b an inward squeezing force, thereby improving the installation stability of the connecting pipe.

[0068] After installation, the wedge-shaped part 202b on one side of the connecting pipe 201b slides and presses against the inclined part 301e on one side of the arc-shaped block 301d. During this sliding and pressing process, the sealing gasket on the inclined part 301e is compressed, thereby improving the sealing effect and also improving the clamping effect on the connecting pipe 201b. When the connecting component 200 is fixedly connected to the water supply pipe 201a, the wedge-shaped part 202b on the connecting pipe 201b slides to the point where it is fully in contact with the inclined part 301e on the arc-shaped block 301d. At the same time, one side of the connecting pipe 201b extends into the mounting groove inside the arc-shaped block 301d and comes into contact with one side of the sealing pipe 301a. At this time, the water supply pipe 201a is activated, and the water flow presses against the sealing block 301a. 2a, which moves the sealing block 302a, exposes the through hole 301b, and then enters the sealing pipe 301a through the through hole 301b. Finally, it enters the connecting pipe 201b through the sealing pipe 301a, thus achieving rapid connection of the pipeline. When the water supply pipe 201a is closed, the return spring 203d resets the sealing block 302a. At this time, the sealing block 302a slides back to above the through hole 301b, blocking the through hole 301b and resealing the sealing pipe 301a. This also has the effect of preventing backflow. The height of the protrusion 302b on one side of the sealing block 302a is greater than the inner diameter of the water supply pipe 201a. When the sealing block 302a is reset, it is limited to reduce the possibility of it falling into the water supply pipe 201a.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method of cooling a nuclear power plant nuclear island equipment, characterized by: include, The structural component (100) includes a structural member (101), which includes a pulsator (101a), an equipment cooling water pump (101b) disposed on one side of the pulsator (101a), an equipment cooling water user disposed on one side of the equipment cooling water pump (101b), and a heat exchanger (101d) disposed on one side of the equipment cooling water user. The structural component (101) also includes an exhaust pipe (101e) and an overflow pipe (101f) disposed on one side of the oscillating box (101a); The structural component (101) also includes an air extraction branch pipe (101g) disposed on one side of the overflow pipe (101f), a drainage branch pipe (101h), a pit (101i) disposed on the lower side of the drainage branch pipe (101h), and a mechanical sealing device (101j) disposed in the air extraction branch pipe (101g) and the drainage branch pipe (101h); The oscillating tank (101a) is connected to the equipment cooling water pump (101b), the equipment cooling water user, the heat exchanger (101d), etc. via pipelines; The top of the wave chamber (101a) is equipped with an exhaust pipe (101e), which leads the exhaust from the wave chamber (101a) to the ventilation system of the nuclear auxiliary plant. The overflow pipe (101f) enters from the bottom of the oscillating box (101a), and the overflow pipe (101f) below the oscillating box (101a) branches into an air extraction branch pipe (101g) and a drainage branch pipe (101h). The drainage branch pipe (101h) is arranged in an "N" bend. The outlet of the drainage branch pipe (101h) is located above the pit (101i). Both the air extraction branch pipe (101g) and the drainage branch pipe (101h) are equipped with mechanical seal devices (101j).

2. The nuclear power plant nuclear island equipment cooling method according to claim 1, characterized by: When the water level in the oscillation chamber (101a) drops, the sealing device in the air extraction branch pipe (101g) opens under air pressure, replenishing air into the oscillation chamber (101a).

3. The nuclear power plant nuclear island equipment cooling method according to claim 2, characterized by: When the water level in the fluctuation tank (101a) rises, the sealing device in the drainage branch pipe (101h) opens under water pressure, and the excess water in the fluctuation tank (101a) is discharged to the pit (101i) through the drainage branch pipe (101h).

4. The nuclear power plant nuclear island equipment cooling method according to claim 2 or 3, characterized by: The interface between the extraction branch pipe (101g) and the overflow pipe (101f) is higher than the interface between the drainage branch pipe (101h) and the overflow pipe (101f).

5. A sealing and connecting device for an overflow pipe (101f), characterized in that: The method for cooling nuclear island equipment in a nuclear power plant according to any one of claims 1 to 4 further includes a connecting component (200), comprising a connecting member (201), an insert (202), a pressing member (203), and a snap-fit ​​member (204), wherein the insert (202) is disposed on one side of the connecting member (201), the pressing member (203) is disposed on the outside of the connecting member (201), and the snap-fit ​​member (204) is disposed on one side of the pressing member (203); The sealing assembly (300) includes a sealing member (301) disposed within the connecting member (201) and a sliding member (302) disposed outside the sealing member (301); The sealing element (301) includes a sealing tube (301a) disposed inside the water supply pipe (201a) and a through hole (301b) opened on the peripheral side of the sealing tube (301a); The sliding member (302) includes a sealing block (302a) slidably disposed on the outside of the sealing tube (301a). The sliding member (302) also includes a protrusion (302b) disposed on one side of the sealing block (302a) and a tension spring (302c) disposed on one side of the sealing block (302a). The two ends of the tension spring (302c) are respectively connected to one side of an arc-shaped block (301d) on one side of the sealing block (302a).

6. The overflow pipe (101f) sealing and connecting device as described in claim 5, characterized in that: The connecting component (201) includes a water supply pipe (201a) and a connecting pipe (201b), and the connecting component (201) also includes an installation sleeve (201c) disposed outside the water supply pipe (201a).

7. The overflow pipe (101f) sealing and connecting device as described in claim 6, characterized in that: The insert (202) includes a card hole (202a) opened on the outside of the connecting tube (201b), and the insert (202) also includes a wedge-shaped portion (202b) opened on one side of the connecting tube (201b) and an annular groove (202c) opened on the outside of the connecting tube (201b).

8. The overflow pipe (101f) sealing and connecting device as described in claim 7, characterized in that: The extrusion member (203) includes an annular fixing plate (203a) slidably disposed on the outside of the connecting member (201) and a sliding tube (203b) slidably disposed on the outside of the connecting member (201). The extrusion member (203) includes an annular fixing plate (203a) disposed on the outside of the mounting sleeve (201c) and a sliding rod (203c) disposed on one side of the annular fixing plate (203a). The extrusion member (203) further includes a sliding tube (203b) slidably disposed outside the slide rod (203c) and a return spring (203d) sleeved outside the slide rod (203c). The two ends of the return spring (203d) are respectively connected to one side of the annular fixing plate (203a) and one side of the sliding tube (203b). The extrusion member (203) further includes a limiting plate (203e) disposed outside the mounting sleeve (201c).

9. The overflow pipe (101f) sealing and connecting device as described in claim 7 or 8, characterized in that: The fastener (204) includes a locking block (204a) disposed on one side of the sliding tube (203b), the locking block (204a) extending into the locking hole (202a) and sliding therewith, the fastener (204) also includes a mounting plate (204c) disposed on the outside of the sliding column (204b) and a compression spring (204d) sleeved on the outside of the sliding column (204b), the two ends of the compression spring (204d) being connected to one side of the sliding tube (203b) and one side of the mounting plate (204c) respectively.

10. The overflow pipe (101f) sealing and connecting device as described in claim 9, characterized in that: The seal (301) further includes a beveled portion (301e) disposed on one side of the arc-shaped block (301d) and a sealing gasket disposed on one side of the beveled portion (301e), the beveled portion (301e) matching the wedge-shaped portion (202b).

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