Nuclear reactor main coolant pump top shaft oil pump pipeline joint connecting device and method

Abstract

The invention belongs to the technical field of nuclear reactor main coolant pump jacking oil systems, and particularly relates to a nuclear reactor main coolant pump jacking oil pump pipeline joint connecting device and method, and the device comprises an oil tank wall, a check valve, an inlet pipeline joint and a super diversion joint; the inlet pipeline is connected with the check valve through the inlet pipeline joint; the super diversion joint penetrates through the oil tank wall and is in threaded connection with the oil tank wall; the tail part of the super diversion joint is in threaded connection with the check valve, and the connection between the tail part of the super diversion joint and the oil tank wall is pressed by the check valve; the head of the super diversion connector is connected with an outlet pipeline through a right-angle connector. The problem that the steering joint of the jacking oil pipeline collapses abnormally can be thoroughly solved, the reliability of the joint is greatly improved, and the safety and stability of a nuclear main pump are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of the jacking oil system of the main coolant pump of a nuclear reactor, and particularly relates to a connecting device and method for the pipeline joint of the jacking oil pump of the main coolant pump of a nuclear reactor. Background Art

[0002] During the startup and shutdown processes of large vertical rotating equipment, a high-pressure jacking oil needs to be provided to the thrust bearing through an independent jacking oil system to separate the thrust disc from the thrust bearing, so as to avoid wear of the thrust bearing caused by the thinning of the bearing oil film during low-speed rotation. The main coolant pump of a nuclear reactor, also known as the nuclear main pump, is located between the reactor and the steam generator in the primary loop. It is one of the pressure boundaries and main equipment of the reactor coolant system, and also the only high-speed rotating equipment in the primary loop main system. The main pump is located at the heart of the nuclear island and is used to pump hot water into the evaporator to convert thermal energy. It is the key to controlling the water cycle in nuclear power operation, and its stable operation performance directly affects the efficiency of nuclear power plants. In a certain power plant, an abnormal situation occurred where the turning joint of the pipeline of the jacking oil pump of the main pump motor burst off, directly resulting in the inavailability of the nuclear main pump, with a huge impact. Therefore, it is necessary to optimize the structure of the pipeline fasteners at this location. Summary of the Invention

[0003] The purpose of the present invention is to provide a connecting device and method for the pipeline joint of the jacking oil pump of the main coolant pump of a nuclear reactor, which can completely solve the abnormal bursting off of the turning joint of the jacking oil pipeline, greatly improve the reliability of the joint, and improve the safety and stability of the nuclear main pump.

[0004] Technical solutions for achieving the purpose of the present invention:

[0005] A connecting device for the pipeline joint of the jacking oil pump of the main coolant pump of a nuclear reactor includes: a tank wall, a check valve, an inlet pipeline joint, and a super flow guide joint; the inlet pipeline is connected to the check valve through the inlet pipeline joint; the super flow guide joint penetrates through the tank wall, and the super flow guide joint is connected to the tank wall by a thread; the tail of the super flow guide joint is threadedly connected to the check valve, and the connection between the tail of the super flow guide joint and the tank wall is tightened through the check valve; the head of the super flow guide joint is connected to the outlet pipeline through a right-angle joint.

[0006] Further, a super nut is provided between the tail of the super flow guide joint and the check valve. The tail of the super flow guide joint is threadedly connected to the super nut, and the connection between the tail of the super flow guide joint and the tank wall is tightened through the super nut.

[0007] Further, a gasket A is provided between the head of the super flow guide joint and the tank wall. The head of the super flow guide joint is threadedly connected to the tank wall and compresses the gasket A.

[0008] Further, a gasket B is provided between the tail of the super flow guiding joint and the fuel tank wall. The gasket B is located inside the super nut, and the tail of the super flow guiding joint is threadedly pressed against the gasket B through the super nut.

[0009] Further, a sealing ring is provided between the head of the super flow guiding joint and the right-angle joint, and the head of the super flow guiding joint is threadedly pressed against the sealing ring through the right-angle joint.

[0010] Further, the head of the super flow guiding joint is a hexagonal head.

[0011] Further, a sealing groove for the sealing ring is provided at the waist of the super flow guiding joint.

[0012] Further, a channel for lubricating oil is provided in the middle of the screw of the super flow guiding joint, and two small through holes are provided at the outlet of the channel for the lubricating oil to flow out.

[0013] Furthermore, a hexagonal head square is provided outside the super nut.

[0014] A connection method for the pipeline joint of the jacking oil pump of the main coolant pump of a nuclear reactor includes:

[0015] Step 1: Install the super flow guiding joint and threadedly connect the super flow guiding joint with the fuel tank wall.

[0016] Step 2: Install the super nut and threadedly connect the super nut with the super flow guiding joint.

[0017] Step 3: Install the inlet pipeline.

[0018] The beneficial technical effects of the present invention are as follows:

[0019] 1. For the connection device of the pipeline joint of the jacking oil pump of the main coolant pump of the nuclear reactor provided by the present invention, by setting the super flow guiding joint as a component penetrating the fuel tank wall and providing threads matching the fuel tank wall outside the super flow guiding joint, it can not only be threadedly connected with the fuel tank wall in full threads to ensure the reliability of the connection and avoid the super flow guiding joint from coming off, but also cooperate with the super nut to achieve the function of double fastening and preloading; at the same time, the connection of each component ensures the stiffness, and also ensures the preloading force required for the sealing between the super flow guiding joint, the sealing member A and the fuel tank wall, as well as the sealing between the super flow guiding joint, the gasket B and the fuel tank wall; achieving the technical effect of zero leakage of the jacking oil pipeline under high pressure conditions, and at the same time eliminating the possibility of the jacking oil pump joint coming off.

[0020] 2. The connecting device for the jacking shaft oil pump pipeline joint of the main coolant pump of a nuclear reactor provided by the present invention realizes the design function of the jacking shaft oil pump pipeline even when the threaded hole of the fuel tank is abnormally damaged. It not only avoids the defect that when the diversion joints are respectively installed on both sides of the fuel tank wall in the original joint device, the abnormal damage of the threaded hole of the fuel tank leads to thread slipping and then the joint breaking off, but also improves the maintainability, safety and reliability of the pipeline joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. is a schematic structural diagram of a connecting device for the jacking shaft oil pump pipeline joint of the main coolant pump of a nuclear reactor provided by the present invention;

[0022] Figure 2 FIG. is a sectional view of a super diversion joint in a connecting device for the jacking shaft oil pump pipeline joint of the main coolant pump of a nuclear reactor provided by the present invention;

[0023] Figure 3 FIG. is a side view of a super diversion joint in a connecting device for the jacking shaft oil pump pipeline joint of the main coolant pump of a nuclear reactor provided by the present invention;

[0024] Figure 4 FIG. is a sectional view of a super nut in a connecting device for the jacking shaft oil pump pipeline joint of the main coolant pump of a nuclear reactor provided by the present invention.

[0025] In the figure: 1 - outlet pipeline; 2 - right-angle joint; 3 - sealing ring; 5 - gasket A; 6 - fuel tank wall; 8 - gasket B; 9 - check valve; 10 - inlet pipeline joint; 11 - inlet pipeline; 12 - super nut; 13 - super diversion joint. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0027] As Figure 1 shown, a connecting device for the jacking shaft oil pump pipeline joint of the main coolant pump of a nuclear reactor provided by the present invention includes: a fuel tank wall 6, a check valve 9, an inlet pipeline joint 10, and a super diversion joint 13.

[0028] The inlet pipeline 11 is connected to the check valve 9 through the inlet pipeline joint 10; the super diversion joint 13 penetrates the fuel tank wall 6. An external thread is provided on the outside of the super diversion joint 13, and the external thread matches the internal thread provided inside the fuel tank wall 6. The super diversion joint 13 is threadedly connected to the fuel tank wall 6.

[0029] The tail of the super diversion joint 13 is threadedly connected to the check valve 9, and the connection between the tail of the super diversion joint 13 and the fuel tank wall 6 is tightened through the check valve 9.

[0030] The head of the super flow guide joint 13 is connected to the outlet pipeline 1 through the right-angle joint 2, and the super flow guide joint 13, the right-angle joint 2, and the outlet pipeline 1 are respectively connected by threads.

[0031] In a preferred embodiment, a super nut 12 is provided between the tail of the super flow guide joint 13 and the check valve 9. The internal thread of the super nut 12 matches the external thread of the super flow guide joint 13. The tail of the super flow guide joint 13 is connected to the super nut 12 by threads, and the connection between the tail of the super flow guide joint 13 and the fuel tank wall 6 is tightened by the super nut 12.

[0032] In another preferred embodiment, a gasket A5 is provided between the head of the super flow guide joint 13 and the fuel tank wall 6. The head of the super flow guide joint 13 is connected to the fuel tank wall 6 by threads and presses the gasket A5, so that the seal between the head of the super flow guide joint 13 and the fuel tank wall 6 is good.

[0033] In another preferred embodiment, a gasket B8 is provided between the tail of the super flow guide joint 13 and the fuel tank wall 6. The gasket B8 is located inside the super nut 12. The tail of the super flow guide joint 13 presses the gasket B8 by the threads of the super nut 12, so that the seal between the tail of the super flow guide joint 13 and the fuel tank wall 6 is good.

[0034] The external thread of the super flow guide joint 13 is set to match the thread of the fuel tank wall 6. On the one hand, it can play a guiding role to avoid the vibration of the structure during operation and affect the service life. On the other hand, it can play a fastening role for the two ends of the joint to avoid the loosening of the joint. It is avoided to install the flow guide joints on both sides of the fuel tank wall in the original joint device. Since the connection reliability between the flow guide joint and the fuel tank wall depends on the thread precision of the fuel tank wall, and through years of experience, it is found that the thread of the fuel tank wall is unreliable, resulting in easy thread slipping and then the joint breaking off. At the same time, the super flow guide joint 13 is set as a component penetrating the fuel tank wall 6, which completely solves the possible leakage risk points at the connection between the flow guide joint and the fuel tank wall when installing the flow guide joints on both sides of the fuel tank wall, and also eliminates the possibility of the flow guide joint and the fuel tank wall breaking off.

[0035] By adopting a threaded connection between the super flow guide joint 13 and the fuel tank wall 6, the thread between the super flow guide joint 13 and the fuel tank wall 6 no longer bears the oil pressure in the oil pipe, but only plays a guiding role and a small part of the pre-tightening force for the sealing requirement between the super flow guide joint 13 and the gasket A5. The oil pressure in the pipeline is directly borne by the inside of the super flow guide joint 13, which greatly improves the safety and stability of the pipeline and the joint.

[0036] A super nut 12 is provided at the tail of the super flow guide joint 13, so that the component 12 and the component 13 can be firmly and tightly combined together, and the situation that the super flow guide joint 13 and the fuel tank wall 6 may become loose is eliminated.

[0037] By adopting a threaded connection between the super flow guiding joint 13 and the super nut 12, the super nut 12 mainly bears the pre-tightening force required for sealing between the super flow guiding joint 13 and the gasket B8.

[0038] In another preferred embodiment, a sealing ring 3 is provided between the head of the super flow guiding joint 13 and the right-angle joint 2. The head of the super flow guiding joint 13 presses the sealing ring 3 tightly through the right-angle joint 2, and good sealing between the head of the super flow guiding joint 13 and the right-angle joint 2 is achieved through the sealing ring 3.

[0039] In another preferred embodiment, the head of the super flow guiding joint 13 is a hexagonal head for wrench tightening. A sealing groove for the sealing ring 3 is provided at the waist of the super flow guiding joint 13, and an external thread for cooperation between the oil tank wall 6 and the super nut 12 is provided outside. A channel for lubricating oil is provided in the middle of the screw of the super flow guiding joint 13, and two small through holes are provided at the channel outlet for the lubricating oil to flow out. The size of the small through holes matches the required lubricating oil flow rate.

[0040] In another preferred embodiment, a hexagonal head square is provided outside the super nut 12, which is convenient for using a wrench for tightening.

[0041] Adopting a connection device for the jacking oil pump pipeline joint of the main coolant pump of a nuclear reactor provided by the present invention, a method for joint connection specifically includes the following steps:

[0042] Step 1: Install the super flow guiding joint 13 and thread-connect the super flow guiding joint 13 with the oil tank wall 6;

[0043] Completely penetrate the super flow guiding joint 13 through the oil tank wall 6, and adopt a threaded connection between the super flow guiding joint 13 and the oil tank wall 6. At this time, the thread between the super flow guiding joint 13 and the oil tank wall 6 no longer bears the oil pressure in the oil pipe, but only plays a guiding role and a small part of the pre-tightening force required for sealing between the super flow guiding joint 13 and the gasket A5. The oil pressure in the pipeline is directly borne by the inside of the super flow guiding joint 13. Greatly improves the safety and stability of the pipeline and the joint.

[0044] Step 2: Install the super nut 12 and thread-connect the super nut 12 with the super flow guiding joint 13;

[0045] The super flow guiding joint 13 and the super nut 12 are thread-connected, and the super nut 12 mainly bears the pre-tightening force required for sealing between the super flow guiding joint 13 and the gasket B8.

[0046] Step 3: Install the inlet pipeline 11;

[0047] Cut the length of the inlet pipeline 11 adaptively and then perform joint welding.

[0048] The present invention has been described in detail above in conjunction with the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art. The content not described in detail in the present invention can all adopt the prior art.

Claims

1. A connecting device for the pipeline joint of the jacking oil pump of the main coolant pump of a nuclear reactor, characterized in that Comprising: A fuel tank wall (6), a check valve (9), an inlet pipeline joint (10), and a super flow guiding joint (13); the inlet pipeline (11) is connected to the check valve (9) through the inlet pipeline joint (10); the super flow guiding joint (13) penetrates through the fuel tank wall (6), and the super flow guiding joint (13) is threadedly connected to the fuel tank wall (6); the tail of the super flow guiding joint (13) is threadedly connected to the check valve (9), and the connection between the tail of the super flow guiding joint (13) and the fuel tank wall (6) is pressed by the check valve (9); the head of the super flow guiding joint (13) is connected to the outlet pipeline (1) through a right-angle joint (2).

2. The connecting device for the pipeline joint of the jacking oil pump of the main coolant pump of a nuclear reactor according to claim 1, characterized in that A super nut (12) is provided between the tail of the super flow guiding joint (13) and the check valve (9), the tail of the super flow guiding joint (13) is threadedly connected to the super nut (12), and the connection between the tail of the super flow guiding joint (13) and the fuel tank wall (6) is pressed by the super nut (12).

3. The connecting device for the pipeline joint of the jacking oil pump of the main coolant pump of a nuclear reactor according to claim 1, characterized in that, A gasket A (5) is provided between the head of the super flow guiding joint (13) and the fuel tank wall (6), and the head of the super flow guiding joint (13) is threadedly connected to and presses the gasket A (5) against the fuel tank wall (6).

4. The connecting device for the pipeline joint of the jacking oil pump of the main coolant pump of a nuclear reactor according to claim 2, wherein, A gasket B (8) is provided between the tail of the super flow guiding joint (13) and the fuel tank wall (6), the gasket B (8) is located inside the super nut (12), and the tail of the super flow guiding joint (13) threadedly presses the gasket B (8) through the super nut (12).

5. The connecting device for the pipeline joint of the jacking oil pump of the main coolant pump of a nuclear reactor according to claim 1, characterized in that A sealing ring (3) is provided between the head of the super flow guiding joint (13) and the right-angle joint (2), and the head of the super flow guiding joint (13) threadedly presses the sealing ring (3) through the right-angle joint (2).

6. The connecting device for the jacking oil pump pipeline joint of the main coolant pump of a nuclear reactor according to claim 1, wherein, The head of the super flow guiding joint (13) is a hexagonal head.

7. A connecting device for the pipeline joint of the jacking oil pump of the main coolant pump of a nuclear reactor according to claim 1, characterized in that A sealing groove for the sealing ring (3) is provided at the waist of the super flow guiding joint (13).

8. The connecting device for the pipeline joint of the jacking oil pump of the main coolant pump of a nuclear reactor according to claim 1, characterized in that, A channel for lubricating oil is provided in the middle of the screw of the super flow guiding joint (13), and two small through holes are provided at the outlet of the channel for the lubricating oil to flow out.

9. The connecting device for the pipeline joint of the jacking oil pump of the main coolant pump of a nuclear reactor according to claim 2, characterized in that, The outside of the super nut (12) is provided with a hexagonal head square.

10. A connection method for the pipeline joint of the jacking oil pump of a nuclear reactor primary coolant pump, which adopts a connection device for the pipeline joint of the jacking oil pump of a nuclear reactor primary coolant pump according to claim 2, characterized in that, Comprising: Step 1: Install the super flow guiding joint (13) and threadedly connect the super flow guiding joint (13) to the fuel tank wall (6); Step 2: Install the super nut (12) and threadedly connect the super nut (12) to the super flow guiding joint (13); Step 3: Install the inlet pipeline (11).

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