Installation and maintenance device for a nuclear power plant waste liquid sampling system

Abstract

The application relates to a kind of installation and maintenance device for nuclear power plant waste liquid sampling system, comprising sampling pump and first pump coupling device, first pump coupling device is used for the connection of sampling pump and sampling pipeline under water and the lifting of sampling pump to the shore base maintenance window above pool wall, it is convenient to overhaul and replace sampling pump;It also includes submersible pump phase and second pump coupling device, second pump coupling device is used for the connection of submersible pump and backwater sampling pipeline under water and the lifting of submersible pump through the manhole of drainage culvert to the entrance of manhole on shore base plane, and a man ladder for maintenance is also arranged in manhole, it is convenient to overhaul and replace submersible pump.The application adopts frame type support structure, reduces the space requirement of equipment occupation by modular assembly, increases guide rod, so that sampling pump can only move up and down along guide rod direction, which greatly facilitates the equipment maintenance in sampling system.

Description

Technical Field

[0001] This invention relates to waste liquid sampling equipment for nuclear power plants. Background Technology

[0002] When sampling wastewater at nuclear power plants, the equipment must be able to resist the electrochemical and microbial corrosion of seawater due to the corrosive nature of seawater and marine microorganisms. At the same time, since seawater contains impurities and organisms, the sampling system must be able to filter out these impurities and organisms. In addition, the installation and maintenance of the sampling system set up in the sea becomes very difficult in environments with limited space, such as manholes.

[0003] The existing equipment for installing and maintaining nuclear power plant waste liquid sampling systems mainly includes submersible pump equipment and rubber hose water intake pipe equipment. In use, a hollow metal sleeve is usually inserted from the shore base to a certain depth below the sea level. The end of the metal sleeve is a filter hole to filter impurities and marine organisms in the seawater. At the same time, the sampling pump of the nuclear power plant waste liquid sampling system is connected by a steel cable and lowered below the sea level along the inner wall of the sleeve. The outlet of the sampling pump is connected to a rubber hose as a water intake pipe. When the sampling pump is under maintenance, the sampling pump is raised and lowered by a winch.

[0004] This method has the following drawbacks:

[0005] 1. The casing extends from the shoreline to below the sea surface, which takes up a lot of space. At the same time, the casing is heavy and requires a large installation platform, making it unsuitable for sampling points with limited space, such as manholes.

[0006] 2. The filter holes at the end of the sleeve are easily clogged by impurities and marine organisms. When the filter holes are clogged, they are difficult to clean. If the filter holes are not cleaned for a long time, it will affect the water pressure and flow rate at the inlet of the sampling device.

[0007] 3. The water pump is lifted and lowered by a winch and steel cable. During the operation, the water pump is not guided by a guide device and is prone to collision with the external sleeve. It is difficult to retract the cable when the water pump is lifted. At the same time, the rubber hose bends and deforms with the water pump. With the increase of repeated lifting, the fatigue of the rubber hose intensifies, and there is a risk of pipe rupture. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a reasonable structure, more suitable for working in the sea, flexible in installation and disassembly, and convenient in maintenance for the installation and maintenance of nuclear power plant waste liquid sampling systems.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an installation and maintenance device for a nuclear power plant waste liquid sampling system, comprising at least one sampling cabinet for waste liquid sampling in the sampling system, wherein the waste liquid inlet end of the sampling cabinet is connected to one end of a sampling pipeline through a first connecting pipeline, and the other end of the sampling pipeline is connected to a sampling pump for drawing waste liquid samples into the sampling cabinet.

[0010] The first pump coupling device and the sampling pump are installed on the sampling pump bracket provided on the wall of the water intake pool. The first pump coupling device is used to connect the sampling pump and the sampling pipeline underwater and to lift the sampling pump to the shore maintenance window above the pool wall, so as to facilitate the inspection and replacement of the sampling pump.

[0011] The waste liquid outlet of the sampling cabinet is connected to one end of the return water sampling pipeline through the second connecting pipeline, and the other end of the return water sampling pipeline is connected to a submersible pump used to extract waste liquid from the sampling cabinet to the drainage culvert or to extract waste liquid from the drainage culvert to the sampling cabinet.

[0012] The submersible pump is mounted on a submersible pump bracket via a second pump coupling device. The submersible pump bracket is mounted at the bottom of the drainage culvert. The second pump coupling device is used to connect the submersible pump to the return water sampling pipeline underwater and to lift the submersible pump through the manhole in the drainage culvert to the entrance of the manhole on the shore plane. A maintenance ladder is also provided in the manhole to facilitate the maintenance and replacement of the submersible pump.

[0013] The waste liquid extraction and sampling device in the drainage culvert is limited by two main factors. First, the installation environment is restricted; the equipment can only be installed vertically through the maintenance manhole or vent valve well that is perpendicular to the culvert. Second, regulations restrict the installation space within these manholes. To resolve these two contradictory issues, this invention explicitly states that the equipment is not allowed to occupy vertical space within the maintenance manhole or vent valve well. Since the water flow velocity within the culvert is high and biological adhesion is not a concern, the submersible pump bracket is installed at the bottom of the drainage culvert, avoiding the reserved maintenance space, and only occupies the space of two guide rods in the vertical direction.

[0014] Furthermore, the sampling pump bracket includes: a horizontal beam that supports the entire assembled frame and is horizontally arranged; at least one inclined beam that supports and fixes the horizontal beam to the pool wall; and a first base plate for installing the sampling pump is set at the bottom end of the assembled frame.

[0015] The crossbeam is used to move the assembled frame away from the water intake pool wall, which has a slow water flow, is covered with a large number of marine organisms, and is severely corroded by biological acids.

[0016] The first pump coupling device includes a first coupling base mounted on the first base plate for underwater connection between the sampling pump and the sampling pipeline, and also includes a first lifting chain and at least one first modular guide rod. One end of the first lifting chain is connected to the sampling pump, and the other end of the first lifting chain is connected to a first winch. The first winch is mounted on a concrete frame above the shore maintenance window. One end of the first modular guide rod is mounted on the first base plate, and the other end of the first modular guide rod is fixed to the concrete frame above the shore maintenance window by a first guide rod bracket.

[0017] The sampling pump is slidably mounted on the first assembled guide rod via the first guide rail hook. The first lifting chain and the first winch cooperate to drive the sampling pump to move up and down along the first assembled guide rod via the first guide rail hook. When the sampling pump is at the top of the first assembled guide rod, the sampling pump is exposed at the construction and maintenance window. When the sampling pump is at the bottom of the first assembled guide rod, the outlet of the sampling pump is connected to the sampling pipeline via the first coupling base.

[0018] Furthermore, the assembled frame includes a first horizontal bar for connecting with the crossbeam, and a frame unit consisting of at least four vertical bars arranged in parallel to each other and a second horizontal bar connecting two pairs of vertical bars. The frame unit consists of at least three segments from above the water surface to underwater, and the two frames are connected by connecting bolts.

[0019] Meanwhile, the sampling pipeline is installed inside the vertical rod of at least one of the frame units, which facilitates the protection and fixation of the sampling pipeline.

[0020] The length of the first horizontal bar is 2.80-3.60m, and the length of the vertical bar is 1.5m-2.6m;

[0021] The first assembled guide rod has a total length of 12-16m and is composed of at least two guide rod sections coaxially arranged and connected by threads. Each guide rod section is 2-3m long. Guide rail support connectors are installed on the first assembled guide rod every 2-3 guide rods. Each guide rail support includes at least one pair of connecting units for connecting the guide rods in pairs. Each connecting unit consists of a connecting rod for inserting into the top of the guide rod and a sleeve coaxially and integrally formed with the connecting rod. The sleeve has internal threads for connecting with the guide rod. A pair of connecting units are connected by a connecting plate.

[0022] The assembled structure of the modular frame and at least one first modular guide rod is used to reduce the attachment area of ​​marine organisms and to use the faster seawater flow to wash the surface, thereby reducing the problem of biological acid corrosion caused by marine organisms. At the same time, the first modular guide rod ensures the stable movement of the sampling pump and prevents malfunctions.

[0023] Furthermore, it also includes a first guide rail hook with one end slidably engaged with the first assembled guide rod via a claw, and a support base for installing the sampling pump at the other end of the first guide rail hook, and a water channel inside the connecting part housing in the middle of the first guide rail hook.

[0024] The first coupling base has a connection channel inside. One end of the connection channel is connected to the sampling pipeline through the first flange, and the other end of the connection channel is connected to one end of the water channel. The other end of the water channel is connected to the pump outlet of the sampling pump. Silicone sealing gaskets are provided on the two connection ports of the water channel to ensure the pump's sealing performance.

[0025] The sampling pump is snapped into a slot on the support base. The bottom of the slot has a through hole that allows the detachable filter device to be exposed, making it convenient for the detachable filter device to be installed at the inlet of the sampling pump.

[0026] Furthermore, the detachable filter device consists of a filter screen holder, a filter screen flange, and a filter screen. The filter screen flange is used to tension the filter screen. The filter screen is installed on the filter screen holder through the filter screen flange. The filter screen flange is fixed to the filter screen holder by a core rivet. The filter screen holder is inserted into the inlet of the sampling pump. When the sampling pump is working, the detachable filter device is subjected to a pair of coupled forces of water flow impact force and tension force, which prevents the filter screen from falling off after long-term use. At the same time, it also avoids the risk of the filter screen being sucked into the water pump.

[0027] The system allows for the detachable filter to move up and down with the sampling pump. When the sampling pump is exposed at the maintenance window, it can be cleaned or replaced, effectively preventing the filter from becoming clogged over long-term use.

[0028] Furthermore, the sampling pump is installed 5-7 meters below the wastewater circulation level in the water intake pool, and the sampling cabinet is installed 7-9 meters above the water level.

[0029] Furthermore, the second pump coupling device includes a second coupling base mounted on the submersible pump bracket for underwater connection between the submersible pump and the return water sampling pipeline, and also includes a second lifting chain and at least one second modular guide rod. One end of the second lifting chain is connected to the submersible pump, and the other end is connected to a second winch, which is mounted on the shore plane. One end of the second modular guide rod is mounted on the submersible pump bracket, and the other end is fixed to the well wall at the manhole opening via a second guide rod bracket.

[0030] The submersible pump is slidably mounted on the second modular guide rod via a second guide rail hook;

[0031] The second lifting chain and the second winch are used to drive the submersible pump to move up and down along the second assembled guide rod via the second guide rail hook. When the submersible pump is at the top of the second assembled guide rod, the submersible pump is located at the manhole inlet. When the submersible pump is at the bottom of the second assembled guide rod, the outlet of the submersible pump is connected to the return water sampling pipeline through the second coupling base.

[0032] It also includes a maintenance ladder, which extends from the entrance of the manhole to the bottom of the drainage culvert.

[0033] Furthermore, the submersible pump bracket includes a second base plate for mounting the submersible pump and at least one end of a second modular guide rod. The second base plate is mounted on a pair of transverse support rods via a pair of support rods perpendicular to the horizontal plane. An inclined support rod is provided between the transverse support rods and the pair of support rods to enhance the supporting force of the pair of support rods. A fixing support rod is also provided between the pair of transverse support rods. The bracket composed of the second base plate, the inclined support rods, the transverse support rods, and the fixing support rod is mounted on the bottom of the drainage culvert via an mounting plate provided on the bottom surface of the transverse support rods.

[0034] The angle between the inclined support rod and the transverse support rod is 30-60 degrees, and the submersible pump bracket is used to fix and support the submersible pump in a high-flow-rate culvert.

[0035] Furthermore, the system includes at least two manholes leading from the shore foundation to the drainage culvert, with each manhole corresponding to an independent drainage culvert, and the multiple drainage culverts are arranged in parallel.

[0036] Furthermore, the drainage culvert is located 4-6 meters underground.

[0037] The beneficial effects of this invention are:

[0038] (1) The present invention adopts a frame support structure and modular assembly, which reduces the requirements for installation space and equipment space, enabling the sampling device to be installed at restricted sampling points such as manholes.

[0039] (2) The present invention integrates a detachable filter device into the water pump inlet, which allows for periodic cleaning and replacement of the filter screen, thus solving the problem of filter screen clogging.

[0040] (3) The present invention adds a guide rod to the pump lifting mechanism, so that the sampling pump can only move up and down along the direction of the guide rod, which facilitates the installation and maintenance of the sampling pump and also protects the pump body.

[0041] (4) Disconnect the sampling pump from the inlet pipe through a coupling device so that the inlet pipe does not need to be lifted with the sampling pump, thus avoiding bending fatigue caused by the use of rubber pipes. Also, equip the sampling pump lifting device with a cable reel so that the pump cable can be wound up and down with the pump. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the installation and maintenance device at the sampling pump end of the present invention;

[0043] Figure 2 This is a schematic diagram of the sampling pump bracket and the first coupling pump device of the present invention;

[0044] Figure 3 This is a schematic diagram of the overall structure of the sampling pump bracket of the present invention;

[0045] Figure 4 This is a schematic diagram of the installation and maintenance device at the submersible pump end of the present invention;

[0046] Figure 5 This is a top view schematic diagram of the installation and maintenance device at the submersible pump end of the present invention;

[0047] Figure 6 This is a schematic diagram of the structure of the submersible pump bracket of the present invention;

[0048] Figure 7 This is a schematic diagram of the detachable filter device of the present invention;

[0049] Figure 8 This is a schematic diagram of the structure of the first guide rail hook and the first coupling base of the present invention;

[0050] Figure 9 This is a schematic diagram of the structure of the guide rail support connector of the present invention.

[0051] Labels in the diagram: 1. Sampling cabinet; 2. Sampling pipeline; 3. Sampling pump; 4. Sampling pump bracket; 41. Assembled frame; 42. Horizontal beam; 43. Inclined beam; 44. First base plate; 45. First horizontal bar; 46. Vertical bar; 47. Second horizontal bar; 48. Connecting bolt; 5. First pump coupling device; 51. First coupling base; 52. First lifting chain; 53. First assembled guide rod; 54. First winch; 55. First guide rod bracket; 56. First flange; 57. First guide rail hook; 57-1. Claw; 57-2. Support seat; 57-3. Silicone sealing gasket; 58. Guide rail support connector; 58-1. Connecting rod; 58-2. Sleeve; 58-3. Connecting... 59. Plate; 59-1. Detachable filter device; 59-2. Filter screen holder; 59-3. Filter screen; 6. Return water sampling pipeline; 7. Submersible pump; 8. Submersible pump bracket; 81. Second base plate; 82. Inclined support rod; 83. Horizontal support rod; 84. Fixing support rod; 85. A pair of support rods; 86. Mounting plate; 9. Manhole; 91. Ladder; 10. Second pump coupling device; 11. First connecting pipeline; 12. Second connecting pipeline; 13. Shore maintenance window; 101. Second coupling base; 102. Second lifting chain; 103. Second assembled guide rod; 104. Second winch; 105. Second guide rail hook; 105. Second guide rod bracket. Detailed Implementation

[0052] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0053] To achieve the above objectives, the present invention provides the following specific embodiments:

[0054] Example 1: As shown in the attached document Figure 1-9 As shown, an installation and maintenance device for a nuclear power plant waste liquid sampling system includes at least one sampling cabinet 1 for waste liquid sampling in the sampling system. The waste liquid inlet end of the sampling cabinet 1 is connected to one end of the sampling pipeline 2 through a first connecting pipeline 11, and the other end of the sampling pipeline 2 is connected to a sampling pump 3 for drawing waste liquid samples into the sampling cabinet 1.

[0055] The first pump coupling device 5 and the sampling pump 3 are installed on the sampling pump bracket 4 provided on the wall of the water intake pool 14. The first pump coupling device 5 is used to connect the sampling pump 3 and the sampling pipeline 2 underwater and to lift the sampling pump 3 to the shore maintenance window 13 above the pool wall, so as to facilitate the inspection and replacement of the sampling pump 3.

[0056] like Figure 1 , 3As shown, the sampling pump bracket 4 includes: a horizontal beam 42 that supports the entire assembled frame 41 and is horizontally arranged; at least one inclined beam 43 supports and fixes the horizontal beam 42 to the pool wall; and a first base plate 44 for installing the sampling pump 3 is set at the bottom end of the assembled frame 41.

[0057] The crossbeam 42 is used to keep the assembled frame 41 away from the water intake pool wall, which has a slow water flow rate, is covered with a large number of marine organisms, and is severely corroded by biological acids.

[0058] like Figure 2 As shown, the first pump coupling device 5 includes a first coupling base 51 mounted on a first base plate 44 for underwater connection between the sampling pump 3 and the sampling pipeline 2, and also includes a first lifting chain 52 and at least one first assembled guide rod 53. One end of the first lifting chain 52 is connected to the sampling pump 3, and the other end of the first lifting chain 52 is connected to a first winch 54. The first winch 54 is mounted on a concrete frame above the shore maintenance window 13. One end of the first assembled guide rod 53 is mounted on the first base plate 44, and the other end of the first assembled guide rod 53 is fixed to the concrete frame above the shore maintenance window 13 by a first guide rod bracket 55.

[0059] The sampling pump 3 is slidably mounted on the first assembled guide rod 53 via the first guide rail hook 57. The first lifting chain 52 and the first winch 54 cooperate to drive the sampling pump 3 to move up and down along the first assembled guide rod 53 via the first guide rail hook 57. When the sampling pump 3 is at the top of the first assembled guide rod 53, the sampling pump 3 is exposed at the construction and maintenance window 13. When the sampling pump 3 is at the bottom of the first assembled guide rod 53, the outlet of the sampling pump 3 is connected to the sampling pipeline 2 via the first coupling base 51.

[0060] The assembled frame 41 includes a first crossbar 45 for connecting to the crossbeam 42, and a frame unit consisting of at least four vertical bars 46 arranged in parallel to each other and a second crossbar 47 connecting two pairs of vertical bars 46. It includes at least three frame units from above the water surface to underwater, and the two frames are connected by connecting bolts 48.

[0061] Meanwhile, the sampling pipeline 2 is installed inside the vertical rod 46 of at least one frame unit, which facilitates the protection and fixation of the sampling pipeline 2.

[0062] The length of the first horizontal bar 45 is 2.80-3.60m, and the length of the vertical bar 46 is 1.5m-2.6m;

[0063] The first assembled guide rod 53 has a total length of 12-16m and is composed of at least two guide rod sections coaxially arranged and connected by threads. Each guide rod section is 2-3m long. Guide rail support connectors 58 are installed on the first assembled guide rod 53 every 2-3 guide rods. Figure 9As shown, the guide rail support 58 includes at least one pair of connecting units for connecting the guide rods in pairs. The connecting unit consists of a connecting rod 58-1 for inserting into the top of the guide rod and a sleeve 58-2 that is coaxial with and integrally formed with the connecting rod 58-1. The sleeve 58-2 has an internal thread for connecting with the guide rod. The pair of connecting units are connected by a connecting plate 58-3.

[0064] The assembly structure of the modular frame 41 and at least one first modular guide rod 53 is used to reduce the attachment area of ​​marine organisms and to use the faster seawater flow to wash the surface, thereby reducing the problem of biological acid corrosion caused by marine organisms. At the same time, the first modular guide rod 53 ensures the stable movement of the sampling pump 3 and prevents malfunctions.

[0065] like Figure 8 As shown, it also includes a first guide rail hook 57, one end of which is slidably engaged with the first assembled guide rod 53 via a claw 57-1, and the other end of the first guide rail hook 57 is provided with a support seat 57-2 for installing the sampling pump 3. A water channel is provided inside the connecting part housing in the middle of the first guide rail hook 57.

[0066] The first coupling base 51 has a connection channel inside. One end of the connection channel is connected to the sampling pipeline 2 through the first flange 56. The other end of the connection channel is connected to one end of the water channel. The other end of the water channel is connected to the pump outlet of the sampling pump 3. Silicone sealing gaskets 57-3 are provided on the two connection ports of the water channel to ensure the pump sealing.

[0067] The sampling pump 3 is snapped into the slot on the support base 57-2. The bottom of the slot has a through hole that allows the detachable filter device 59 to be exposed, so that the detachable filter device can be installed at the inlet of the sampling pump 3.

[0068] like Figure 7 As shown, the detachable filter device 59 consists of a filter screen holder 59-1, a filter screen flange 59-2, and a filter screen 59-3. The filter screen flange 59-2 is used to tension the filter screen 59-3. The filter screen 59-3 is installed on the filter screen holder 59-1 through the filter screen flange 59-2. The filter screen flange 59-2 is fixed to the filter screen holder 59-1 by a core rivet. The filter screen holder 59-1 is inserted into the inlet of the sampling pump 3. When the sampling pump 3 is working, the detachable filter device 59 is subjected to a pair of coupled forces of water flow impact force and tension force, which prevents the filter screen 59-3 from falling off after long-term use. At the same time, it also avoids the risk of the filter screen 59-3 being sucked into the water pump.

[0069] The detachable filter device moves up and down together with the sampling pump 3. When the sampling pump 3 is exposed at the maintenance window 13, it can be cleaned or replaced, effectively preventing the filter from becoming clogged after long-term use.

[0070] Sampling pump 3 is installed 5-7 meters below the waste liquid circulation water level in the water intake pool, and sampling cabinet 1 is installed 7-9 meters above the water level.

[0071] In practical applications, the sampling point of the waste liquid intake pool is located in the intake pool of the nuclear power plant. The intake support includes a modular frame 41 and a sampling pump support 4 similar to a cantilever. The first coupling base 51 is installed at the bottom of the modular frame 41, and the first modular guide rod is installed on the modular frame 41 through the guide rod fixing bracket. The sampling pump bracket 4 is installed on the side wall of the shore foundation, at a height above sea level to avoid underwater installation operations. After the sampling pump bracket 4 is assembled on the shore foundation, the prefabricated frame 41 and the underwater part of the first prefabricated guide rod 53 are installed, and then the whole assembly is sunk below sea level. Then, the remaining part of the first prefabricated guide rod 53 is installed, and finally the upper end of the guide rod is fixed near the shore foundation by the first guide rod bracket 51. The cable of the sampling pump 3 is pre-wound on the first winch 54, and the first lifting chain 52 is fixed in the middle of the handle of the sampling pump 3. The first lifting chain is pre-wound on the first winch 54, which can be electric or manual. The sampling pump 3 is installed on the guide rod through the first guide rail hook 57, and the first winch 54 is driven to slowly lower the first lifting chain 52 until the first guide rail hook 57 engages with the first coupling base, and the installation is completed.

[0072] like Figure 4 , 5 As shown in Figure 6, the waste liquid outlet of the sampling cabinet 1 is connected to one end of the return water sampling pipe 6 through the second connecting pipe 12, and the other end of the return water sampling pipe 6 is connected to the submersible pump 7 used to draw the waste liquid from the sampling cabinet 1 to the drainage culvert or to draw the waste liquid from the drainage culvert to the sampling cabinet 1.

[0073] The submersible pump 7 is mounted on the submersible pump bracket 8 via the second pump coupling device 10. The submersible pump bracket 8 is mounted at the bottom of the drainage culvert. The second pump coupling device 10 is used to connect the submersible pump 7 to the return water sampling pipeline 6 underwater and to lift the submersible pump 7 through the manhole 9 in the drainage culvert to the entrance of the manhole 9 on the shore plane. A maintenance ladder 91 is also provided in the manhole 9 to facilitate the maintenance and replacement of the submersible pump 7.

[0074] The second pump coupling device 10 includes a second coupling base 101 mounted on the submersible pump bracket 8 for underwater connection between the submersible pump 7 and the return water sampling pipeline 6, and also includes a second lifting chain 102 and at least one second assembled guide rod 103. One end of the second lifting chain 102 is connected to the submersible pump 7, and the other end of the second lifting chain 102 is connected to a second winch 104, which is mounted on the shore foundation plane. One end of the second assembled guide rod 103 is mounted on the submersible pump bracket 8, and the other end of the second assembled guide rod 103 is fixed to the well wall at the wellhead of the manhole 9 via a second guide rod bracket 105.

[0075] The submersible pump 7 is slidably mounted on the second modular guide rod 103 via the second guide rail hook 105;

[0076] The second lifting chain 102 and the second winch 104 cooperate to drive the submersible pump 7 to move up and down along the second assembled guide rod 103 via the second guide hook 105. When the submersible pump 7 is at the top of the second assembled guide rod 103, the submersible pump 7 is located at the entrance of the manhole 9. When the submersible pump 7 is at the bottom of the second assembled guide rod 103, the outlet of the submersible pump 7 is connected to the return water sampling pipeline 6 through the second coupling base 101.

[0077] It also includes a maintenance ladder 91, which extends from the entrance of the manhole 9 to the bottom of the drainage culvert.

[0078] The structures of the second coupling base 101, the second guide rail hook 105, and the second assembled guide rod 103 are the same as those of the first coupling base 51, the first guide rail hook 57, and the first assembled guide rod 53, respectively, so they will not be described again.

[0079] like Figure 6 As shown, the submersible pump bracket 8 includes a second base plate 81 for mounting a submersible pump 7 and at least one end of a second modular guide rod 103. The second base plate 81 is mounted on a pair of transverse support rods 83 via a pair of support rods 85 perpendicular to the horizontal plane. An inclined support rod 82 is provided between the transverse support rods 83 and the pair of support rods 85 to enhance the supporting force of the pair of support rods 85. A fixing support rod 84 is also provided between the pair of transverse support rods 83. The bracket composed of the second base plate 81, the inclined support rod 82, the transverse support rods 83 and the fixing support rod 84 is mounted on the bottom of the drainage culvert via an mounting plate 86 provided on the bottom surface of the transverse support rods 83.

[0080] The angle between the inclined support rod 82 and the transverse support rod 83 is 30-60 degrees. The submersible pump bracket 8 is used to fix and support the submersible pump 7 in a high-flow-rate culvert.

[0081] like Figure 4 As shown, the system includes at least two manholes 9 leading from the shore foundation to the drainage culverts. Each manhole 9 corresponds to an independent drainage culvert, and the multiple drainage culverts are arranged in parallel. The drainage culverts are located 4-6 meters underground.

[0082] In practical applications, the sampling point of the waste liquid drainage pool is located in the culvert directly below the exhaust valve well of the nuclear power plant. The drainage outlet support includes the second assembled guide rod 103, the second guide rod support 105, the submersible pump support 8, and other parts. The submersible pump bracket 8 is installed on the bottom plane of the drainage culvert. During installation, the spacer beam is removed, the bracket is vertically hoisted, and lowered into the culvert through the vent valve well. Underwater workers then reinstall the spacer beam and fix the submersible pump bracket in the designated position, and install the second pump coupling device 10. The second modular guide rod 103 and the second guide rod bracket 105 are assembled on the ground and lowered through the vent valve well. The bottom end of the guide rod is fixed to the submersible pump bracket 8, and the other end of the guide rod is fixed to the well wall. The second lifting chain 102 is fixed in the middle of the handle of the submersible pump 8 and pre-wound onto the second winch 104. The submersible pump 8 is clamped onto the second modular guide rod 103 through the second guide rail hook 105. The cable of the submersible pump 8 is pre-wound onto the second winch 104 through the cable hole. The winch is started, and the second winch 104 is slowly lowered until the second guide rail hook 105 engages with the second coupling base 101. The vent valve cover is then closed to complete the installation.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An installation and maintenance device for a nuclear power plant waste liquid sampling system, characterized in that, The system includes at least one sampling cabinet (1) for waste liquid sampling, the waste liquid inlet end of the sampling cabinet (1) is connected to one end of the sampling pipeline (2) through a first connecting pipeline (11), and the other end of the sampling pipeline (2) is connected to a sampling pump (3) for drawing waste liquid samples into the sampling cabinet (1). The first pump coupling device (5) and the sampling pump (3) are installed on the sampling pump bracket (4) provided on the wall of the water intake pool (14). The first pump coupling device (5) is used to connect the sampling pump (3) and the sampling pipeline (2) underwater and to lift the sampling pump (3) to the shore maintenance window (13) above the pool wall, so as to facilitate the inspection and replacement of the sampling pump (3). The waste liquid outlet of the sampling cabinet (1) is connected to one end of the return water sampling pipeline (6) through the second connecting pipeline (12), and the other end of the return water sampling pipeline (6) is connected to the submersible pump (7) used to draw the waste liquid from the sampling cabinet (1) to the drainage culvert or to draw the waste liquid from the drainage culvert to the sampling cabinet (1). The submersible pump (7) is mounted on the submersible pump bracket (8) via the second pump coupling device (10). The submersible pump bracket (8) is mounted at the bottom of the drainage culvert. The second pump coupling device (10) is used to connect the submersible pump (7) and the return water sampling pipeline (6) underwater and to lift the submersible pump (7) through the drainage culvert to the entrance of the manhole (9) on the shore plane. A maintenance ladder (91) is also provided in the manhole (9) to facilitate the maintenance and replacement of the submersible pump (7). The sampling pump bracket (4) includes: a horizontal beam (42) that supports the entire assembled frame (41) and is horizontally arranged; at least one inclined beam (43) supports and fixes the horizontal beam (42) to the pool wall; the horizontal beam (42) is used to move the assembled frame (41) away from the pool wall of the water intake pool where the water flow is slow, the surface is covered with a large number of marine organisms and is severely corroded by biological acid; The first pump coupling device (5) includes a first coupling base (51) installed on a first base plate (44) for underwater connection of the sampling pump (3) and the sampling pipeline (2), and also includes a first lifting chain (52) and at least one first assembled guide rod (53). One end of the first lifting chain (52) is connected to the sampling pump (3), and the other end of the first lifting chain (52) is connected to a first winch (54). The first winch (54) is installed on a concrete frame above the shore maintenance window (13). One end of the first assembled guide rod (53) is installed on the first base plate (44), and the other end of the first assembled guide rod (53) is fixed on the concrete frame above the shore maintenance window (13) by a first guide rod bracket (55). The sampling pump (3) is slidably mounted on the first assembled guide rod (53) via the first guide rail hook (57). The first lifting chain (52) and the first winch (54) work together to drive the sampling pump (3) to move up and down along the first assembled guide rod (53) via the first guide rail hook (57). When the sampling pump (3) is at the top of the first assembled guide rod (53), the sampling pump (3) is exposed at the shore maintenance window (13). When the sampling pump (3) is at the bottom of the first assembled guide rod (53), the outlet of the sampling pump (3) is connected to the sampling pipeline (2) via the first coupling base (51). It also includes the first guide rail hook (57) with one end slidably hooked onto the first assembled guide rod (53) via a claw (57-1), and the other end of the first guide rail hook (57) is provided with a support seat (57-2) for installing the sampling pump (3). The connecting part housing in the middle of the first guide rail hook (57) is provided with a water channel. The first coupling base (51) is provided with a connection channel inside. One end of the connection channel is connected to the sampling pipeline (2) through the first flange (56). The other end of the connection channel is connected to one end of the water channel. The other end of the water channel is connected to the pump outlet of the sampling pump (3). Silicone sealing gaskets (57-3) are provided on the two connection ports of the water channel to ensure the pump sealing. The sampling pump (3) is snapped into a slot on the support base (57-2). The bottom of the slot has a through hole that allows the detachable filter device (59) to be exposed, so that the detachable filter device can be installed at the inlet of the sampling pump (3).

2. The installation and maintenance device for a nuclear power plant waste liquid sampling system as described in claim 1, characterized in that, The assembled frame (41) includes a first crossbar (45) for connecting to the crossbeam (42), and a frame unit consisting of at least four vertical bars (46) arranged in parallel to each other and a second crossbar (47) connecting two vertical bars (46). The frame unit consists of at least three segments from above the water surface to underwater, and the two frame units are connected by connecting bolts (48). Meanwhile, the sampling pipeline (2) is installed inside the vertical rod (46) of at least one of the frame units, which facilitates the protection and fixation of the sampling pipeline (2); The length of the first horizontal bar (45) is 2.80-3.60m, and the length of the vertical bar (46) is 1.5m-2.6m; The first assembled guide rod (53) has a total length of 12-16m and is composed of at least two guide rods coaxially arranged and connected by threads. The length of each guide rod is 2-3m. A guide rail support connector (58) is installed on the first assembled guide rod (53) every 2-3 guide rods. The guide rail support connector (58) includes at least one pair of connecting units for connecting the guide rods in pairs. The connecting unit is composed of a connecting rod (58-1) for inserting into the top of the guide rod and a sleeve (58-2) coaxial with and integrally set with the connecting rod (58-1). The sleeve (58-2) has an internal thread for connecting with the guide rod. A pair of connecting units are connected by a connecting plate (58-3).

3. The installation and maintenance device for a nuclear power plant waste liquid sampling system as described in claim 1, characterized in that, The detachable filter device (59) consists of a filter screen holder (59-1), a filter screen flange (59-2), and a filter screen (59-3). The filter screen flange (59-2) is used to tension the filter screen (59-3). The filter screen (59-3) is installed on the filter screen holder (59-1) through the filter screen flange (59-2). The filter screen flange (59-2) is fixed on the filter screen holder (59-1) by a core rivet. The filter screen holder (59-1) is inserted into the inlet of the sampling pump (3).

4. The installation and maintenance device for a nuclear power plant waste liquid sampling system as described in any one of claims 1-3, characterized in that, The sampling pump (3) is installed 5-7 meters below the waste liquid circulation water level in the water intake pool, and the sampling cabinet (1) is installed 7-9 meters above the horizontal plane.

5. The installation and maintenance device for a nuclear power plant waste liquid sampling system as described in claim 1, characterized in that, The second pump coupling device (10) includes a second coupling base (101) installed on the submersible pump bracket (8) for underwater connection of the submersible pump (7) and the return water sampling pipeline (6), and also includes a second lifting chain (102) and at least one second assembled guide rod (103). One end of the second lifting chain (102) is connected to the submersible pump (7), and the other end of the second lifting chain (102) is connected to the second winch (104), which is installed on the shore foundation plane. One end of the second assembled guide rod (103) is installed on the submersible pump bracket (8), and the other end of the second assembled guide rod (103) is fixed to the well wall at the wellhead of the manhole (9) through the second guide rod bracket (105). The submersible pump (7) is slidably mounted on the second modular guide rod (103) via the second guide rail hook; The second lifting chain (102) and the second winch (104) are used to drive the submersible pump (7) to move up and down along the second assembled guide rod (103) via the second guide hook. When the submersible pump (7) is at the top of the second assembled guide rod (103), the submersible pump (7) is located at the entrance of the manhole (9). When the submersible pump (7) is at the bottom of the second assembled guide rod (103), the outlet of the submersible pump (7) is connected to the return water sampling pipeline (6) through the second coupling base (101).

6. The installation and maintenance device for a nuclear power plant waste liquid sampling system as described in claim 5, characterized in that, The submersible pump bracket (8) includes a second base plate (81) for mounting the submersible pump (7) and at least one second modular guide rod (103) at one end. The second base plate (81) is mounted on a pair of transverse support rods (83) by a pair of support rods (85) perpendicular to the horizontal plane. An inclined support rod (82) is provided between the transverse support rods (83) and the pair of support rods (85) to enhance the support force of the pair of support rods (85). A fixing support rod (84) is also provided between the pair of transverse support rods (83). The bracket composed of the second base plate (81), the inclined support rod (82), the transverse support rod (83) and the fixing support rod (84) is installed at the bottom of the drainage culvert by an mounting plate (86) provided on the bottom surface of the transverse support rod (83). The angle between the inclined support rod (82) and the transverse support rod (83) is 30-60 degrees, and the submersible pump bracket (8) is used to fix and support the submersible pump (7) in a high-velocity culvert.

7. The installation and maintenance device for a nuclear power plant waste liquid sampling system as described in claim 1, characterized in that, It includes at least two manholes (9) leading from the shore to the drainage culvert, each manhole (9) corresponding to an independent drainage culvert, and multiple drainage culverts are arranged in parallel.

8. The installation and maintenance device for a nuclear power plant waste liquid sampling system as described in any one of claims 1, 5-7, characterized in that, The drainage culvert is located 4-6 meters underground.

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