Nuclear power station equipment cooling water pump

Abstract

The invention relates to the technical field of cooling water pumps, and discloses a nuclear power station equipment cooling water pump which comprises a motor, the output end of the motor is connected with a pump shaft through a coupler, the other end of the pump shaft is connected with a pump body, and a sealing mechanism is connected between the pump body and the pump shaft and comprises a sealing shell which is composed of a shell body and an end cover. A static ring is fixedly connected into the end cover, a movable ring is arranged on one side of the static ring, a telescopic piece is arranged on one side of the movable ring, a plurality of elastic pieces are arranged on the telescopic piece, the elastic pieces drive the telescopic piece to stretch so that the movable ring can abut against the static ring, and a positioning piece is arranged on the side, facing the arc-shaped elastic piece, of the fixed ring and used for limiting recovery deformation of the arc-shaped elastic piece. The elastic pieces are arranged in a staggered mode, the number and range of force application points on the movable ring can be increased, it is ensured that thrust is evenly applied to the movable ring, meanwhile, the reset deformation of the arc-shaped elastic pieces is limited through the limiting blocks when the pump shaft rotates, and the movable ring is prevented from moving when impacted.

Description

Technical Field

[0001] The invention relates to the technical field of cooling water pumps, and in particular to a cooling water pump for nuclear power plant equipment. Background Art

[0002] Nuclear power plants generate heat energy through nuclear reactors, which is then converted into electrical energy. In order to ensure the stable operation of various equipment in nuclear power plants (such as motors, transformers, control equipment, etc.), cooling water pumps are required to pump cooling water to cool the equipment.

[0003] Since the internal environment of a nuclear power plant is in a high temperature and high pressure state, a mechanical seal is required to connect the pump shaft and the pump body of the cooling water pump. The advantages of mechanical seals are good sealing performance, low leakage, and they can be applied to high pressure, high speed and high temperature conditions to meet the application requirements of nuclear power plants. Mechanical seals mainly use elastic elements to apply axial pressure to the dynamic ring so that the dynamic ring and the static ring are always in close contact. The existing elastic elements mainly use springs as elastic support. During the operation of the cooling water pump, vibration, movement, and water pressure changes are prone to impact the dynamic ring. The characteristics of the spiral spring are prone to cause local stress concentration, making it difficult to apply uniform pressure to the dynamic ring. The side of the dynamic ring with less force is far away from the static ring, making the end face gap between the dynamic ring and the static ring uneven, which is easy to increase the wear rate of the dynamic ring and the probability of leakage of cooling water, resulting in a greater hidden danger to the safe operation of nuclear power plant equipment. Summary of the invention

[0004] In view of the problem in the prior art that the elastic element in the mechanical seal is difficult to apply uniform pressure to the dynamic ring, resulting in a gap between the dynamic ring and the static ring, a cooling water pump for nuclear power plant equipment is proposed.

[0005] The purpose is to increase the support points with the dynamic ring by staggered arrangement of multiple elastic parts, and at the same time limit the elastic parts by limiting parts when the cooling water pump is running to prevent the dynamic ring from moving after being impacted.

[0006] The technical solution of the present invention is a cooling water pump for nuclear power plant equipment, comprising a motor, wherein the output end of the motor is connected to a pump shaft through a coupling, the other end of the pump shaft is connected to a pump body, a sealing mechanism is commonly connected between the pump body and the pump shaft, the sealing mechanism comprises a sealing shell, the sealing shell is composed of a shell and an end cover, a static ring is fixedly connected inside the end cover, a dynamic ring is arranged on the side of the static ring facing the shell, the pump shaft movably passes through the shell, the static ring and the end cover, the dynamic ring is sleeved on the pump shaft, a telescopic member is arranged on the side of the dynamic ring away from the static ring, the telescopic member is sleeved on the pump shaft, and a plurality of elastic members are arranged on the telescopic member, the elastic member drives the telescopic member to stretch so that the dynamic ring abuts against the static ring; The elastic member comprises a fixing ring sleeved on the telescopic member, and a plurality of arc-shaped spring pieces are evenly distributed on one side of the fixing ring; A positioning member is provided on the side of the fixing ring facing the arc-shaped spring piece. The positioning member includes a connecting ring rotatably connected to the fixing ring. A plurality of positioning blocks are evenly distributed on the outer ring of the connecting ring. The positioning blocks are used to limit the restoring deformation of the arc-shaped spring piece.

[0007] By adopting the above technical scheme, multiple elastic members are axially evenly spaced and sleeved on the telescopic member. Two adjacent elastic members slide in contact with each other, and the arc-shaped spring piece is in a compressed state. At this time, multiple elastic members cooperate to evenly apply a thrust toward the movable ring side to the telescopic member, so that the telescopic member stretches and abuts against the movable ring, so that the movable ring contacts the static ring. When the motor drives the pump shaft to rotate, the movable ring, the telescopic member, and the elastic member rotate synchronously with the pump shaft. The connecting ring drives the positioning block to contact the arc-shaped spring piece under the action of inertia, preventing the arc-shaped spring piece from moving in the direction of the compression state, thereby avoiding the movable ring from moving away from the static ring when impacted, so that the movable ring and the static ring always maintain effective contact.

[0008] Furthermore, the shell and the end cover are connected and fixed, the shell and the pump shaft are rotationally connected in a sealing manner, and the end cover is connected and fixed to the pump body.

[0009] By adopting the above technical solution, the shell and the end cover are fixed by bolts, and a sealing ring is provided between the shell and the end cover. A circular hole larger than the pump shaft is opened at the left end of the shell and the right end of the end cover. An O-ring is embedded in the circular hole at the left end of the shell, and the O-ring is sleeved on the pump shaft.

[0010] Furthermore, the telescopic member includes a fixed seat and a push ring sleeved on the pump shaft, the fixed seat is fixedly connected to a sleeve on one side facing the push ring, a plurality of notches are formed in an annular shape and at equal intervals on the sleeve, a plurality of arc plates are fixedly connected to one side of the push ring, and the arc plates are slidably connected to the notches; The fixing seat is connected and fixed to the pump shaft, and the push ring is arranged between the fixing seat and the moving ring.

[0011] By adopting the above technical solution, a plurality of screw holes are opened on the fixing seat, and the mounting bolts in the screw holes abut against the outer wall of the pump shaft, so that the fixing seat is connected and fixed to the pump shaft, and the elastic member can drive the push ring to abut against the moving ring by utilizing the telescopic sliding cooperation of the arc plate and the sleeve.

[0012] Furthermore, the arc-shaped spring piece has a semicircular structure in the original length state, and has a poorly arc-shaped structure in the deformed state.

[0013] By adopting the above technical solution, the arc-shaped spring piece is made of a metal material with bending deformation and automatic recovery. By setting a plurality of arc-shaped spring pieces, the number of force application points on the moving ring and the area of ​​a single force application point can be increased, thereby applying a uniform thrust to the moving ring.

[0014] Furthermore, one end of the arc-shaped spring piece is rotatably connected to the fixing ring, and the other end of the arc-shaped spring piece is fixedly connected to a connecting shaft, and a plurality of arc-shaped holes are opened on the fixing ring, and the connecting shaft is slidably connected to the arc-shaped holes; A synchronization ring is arranged on one side of the fixing ring away from the arc-shaped spring piece, and one end of the connecting shaft passes through the arc-shaped hole and is connected and fixed to the synchronization ring.

[0015] By adopting the above technical solution, the arc-shaped spring pieces are elastically deformed through the cooperation of the connecting shaft and the arc-shaped hole, and the synchronous ring is used to connect all the arc-shaped spring pieces, so that all the arc-shaped spring pieces can be deformed synchronously, ensuring that the elastic member always applies uniform pressure to the dynamic ring in the axial direction.

[0016] Furthermore, a plurality of positioning slide plates are fixedly arranged at equal intervals on the inner ring of the fixing ring, and sliding grooves are provided on the outer side walls of the sleeve and the arc-shaped plate, and the positioning slide plates are in sliding contact with the sliding grooves.

[0017] By adopting the above technical solution, the positioning slide plate and the slide groove are used to stably set the fixed ring on the telescopic member, so that the axial force of all elastic members is limited to the same circular range, ensuring that the push ring applies uniform pressure to the moving ring.

[0018] Furthermore, the cross section of the connecting ring is a T-shaped structure, a plurality of arc grooves are provided on the inner ring of the connecting ring, the arc grooves are slidably connected to the positioning slide plate, and a plurality of positioning blocks are fixedly connected to the outer ring of the connecting ring.

[0019] By adopting the above technical solution, after the arc groove is connected to the positioning slide plate, the connecting ring has a certain rotation range. When the fixed ring rotates with the pump shaft, the connecting ring rotates relative to the fixed ring due to the influence of inertia, and the positioning block abuts against the connecting shaft due to the influence of inertia, so that the resistance of the arc-shaped spring piece increases when restoring the deformation. As a result, when the dynamic ring is impacted and moves away from the static ring, the resistance of the arc-shaped spring piece to recovery is relatively large, which can avoid obvious displacement of the dynamic ring, ensure effective contact between the dynamic ring and the static ring, and avoid medium leakage.

[0020] Furthermore, a plurality of dynamic pressure grooves are formed in a circular shape and at equal intervals on one side of the connecting ring away from the fixed ring, the width of the dynamic pressure groove close to the outer ring of the connecting ring is greater than the width close to the inner ring of the connecting ring, and the depth of the inlet end of the dynamic pressure groove is greater than the depth of the outlet end.

[0021] By adopting the above technical solution, after the positioning block abuts against the connecting shaft, the connecting ring rotates synchronously with the fixed ring. At this time, the inlet end of the dynamic pressure groove cuts the air or liquid, thereby increasing the inertial effect of the connecting ring and increasing the resistance applied by the positioning block to the connecting shaft. At the same time, when the air or liquid passes through the inclined surface of the dynamic pressure groove, the rotational friction between the connecting ring and the fixed ring is increased, thereby improving the stability of the positioning block in limiting the connecting shaft.

[0022] Furthermore, a cooling cavity is provided on the shell, a connecting pipe port connected to the cooling cavity is fixedly provided on the shell, a water pipe is fixedly connected to the connecting pipe port, and the other ends of the two water pipes are respectively connected to the water inlet and the water outlet of the pump body.

[0023] By adopting the above technical solution, when the water pump is delivering cooling water, the water inlet of the pump body delivers part of the cooling water to the cooling chamber through the water pipe. This part of the cooling water absorbs the heat in the sealing shell and then flows to the water outlet of the pump body through another water pipe, so that the inside of the sealing shell can be cooled, thereby preventing the arc-shaped spring from reducing the elastic effect in a long-term high temperature environment.

[0024] Compared with the prior art, the present invention has the following beneficial effects: 1. The number and range of force application points on the dynamic ring can be increased by staggered arrangement of multiple elastic members, ensuring uniform thrust on the dynamic ring and maintaining uniform contact between the dynamic ring and the static ring. At the same time, when the elastic member rotates with the pump shaft, the connecting ring is affected by inertia to drive the limit block to move, so that it limits the restoring deformation of the arc-shaped spring piece, making it difficult for the elastic member to compress and deform during rotation, thereby preventing the dynamic ring from moving when impacted, causing a gap between the dynamic ring and the static ring to cause medium leakage.

[0025] 2. When the connecting ring rotates with the fixed ring, the dynamic pressure groove cuts the air or liquid to increase the limiting effect of the limit block on the arc-shaped spring piece. At the same time, when the air or liquid passes through the inclined surface of the dynamic pressure groove, the contact between the connecting ring and the fixed ring is closer, ensuring the limiting stability of the limit block on the arc-shaped spring piece.

[0026] 3. The pump body and the cooling chamber are connected through the water pipe. When the pump body delivers cooling water, part of the cooling water passes through the cooling chamber, so that the inside of the sealed shell can be cooled to avoid the arc-shaped spring piece from reducing the elastic effect in a long-term high temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a schematic cross-sectional view of the sealing shell structure of the present invention; Figure 3 It is a schematic diagram of the disassembly of the telescopic member structure of the present invention; Figure 4 It is a schematic cross-sectional view of the structure of the static ring, the dynamic ring and the telescopic member of the present invention; Figure 5 It is a schematic diagram of the elastic member structure of the present invention; Figure 6 It is a schematic diagram of the disassembly of the fixing ring, arc-shaped spring piece and synchronization ring structure of the present invention; Figure 7 It is a schematic diagram of the structure of the connecting shaft and the positioning block of the present invention; Figure 8 It is a schematic diagram of the disassembly of the fixing ring and the connecting ring structure of the present invention; Fig. 9 For the present invention Figure 7 A schematic diagram of the enlarged structure in the middle.

[0028] In the figure: 1. Motor; 2. Pump shaft; 3. Pump body; 4. Sealing shell; 41. Shell; 42. End cover; 43. Cooling chamber; 44. Pipe connection; 5. Static ring; 6. Dynamic ring; 7. Telescopic member; 71. Fixed seat; 72. Push ring; 73. Sleeve; 74. Arc plate; 75. Slide groove; 8. Elastic member; 81. Fixed ring; 82. Positioning slide plate; 83. Arc spring piece; 84. Connecting shaft; 85. Arc hole; 86. Synchronous ring; 9. Positioning member; 91. Connecting ring; 92. Arc groove; 93. Positioning block; 94. Dynamic pressure groove; 10. Water guide pipe. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] Example 1, reference Figure 1-Figure 6 , which is the first embodiment of the present invention, provides a cooling water pump for nuclear power plant equipment, including a motor 1, the output end of the motor 1 is connected to a pump shaft 2 through a coupling, the other end of the pump shaft 2 is connected to a pump body 3, a sealing mechanism is commonly connected between the pump body 3 and the pump shaft 2, the sealing mechanism includes a sealing shell 4, the sealing shell 4 is composed of a shell 41 and an end cover 42, a static ring 5 is fixedly connected inside the end cover 42, a dynamic ring 6 is provided on the side of the static ring 5 facing the shell 41, the pump shaft 2 movably penetrates the shell 41, the static ring 5, and the end cover 42, the dynamic ring 6 is sleeved on the pump shaft 2, and the dynamic ring 6 is away from the static ring 5. A telescopic member 7 is provided, which is sleeved on the pump shaft 2, and a plurality of elastic members 8 are provided on the telescopic member 7, which drives the telescopic member 7 to extend so that the dynamic ring 6 abuts against the static ring 5; the elastic member 8 includes a fixed ring 81 sleeved on the telescopic member 7, and a plurality of arc-shaped spring pieces 83 are evenly distributed on one side of the fixed ring 81; a positioning member 9 is provided on the side of the fixed ring 81 facing the arc-shaped spring pieces 83, and the positioning member 9 includes a connecting ring 91 rotatably connected to the fixing ring 81, and a plurality of positioning blocks 93 are evenly distributed on the outer ring of the connecting ring 91, and the positioning blocks 93 are used to limit the restoring deformation of the arc-shaped spring pieces 83.

[0031] Specifically, a plurality of elastic members 8 are axially equidistantly arranged and sleeved on the telescopic member 7, and two adjacent elastic members 8 are in sliding contact with each other, and the arc-shaped spring piece 83 is in a compressed state. At this time, the plurality of elastic members 8 cooperate to uniformly apply a thrust toward the side of the dynamic ring 6 to the telescopic member 7, so that the telescopic member 7 stretches and abuts against the dynamic ring 6, so that the dynamic ring 6 contacts the static ring 5. When the motor 1 drives the pump shaft 2 to rotate, the dynamic ring 6, the telescopic member 7, and the elastic member 8 rotate synchronously with the pump shaft 2, and the connecting ring 91 drives the positioning block 93 to contact the arc-shaped spring piece 83 under the action of inertia, preventing the arc-shaped spring piece 83 from moving in the direction of the compressed state, thereby preventing the dynamic ring 6 from moving away from the static ring 5 when impacted, so that the dynamic ring 6 and the static ring 5 always maintain effective contact.

[0032] Reference Figure 4 An annular groove is provided on the inner wall of the moving ring 6, and an O-ring is arranged in the annular groove. The O-ring is sleeved on the pump shaft 2 to improve the sealing performance between the moving ring 6 and the pump shaft 2 and prevent medium leakage. At the same time, the O-ring has good elasticity and flexibility, and can adapt to the slight displacement changes of the moving ring 6 within a certain range. It can compensate for the vibration of the water pump and the axial displacement of the pump shaft 2 through its own deformation, maintain good contact with the moving ring 6 and the pump shaft 2, and maintain the sealing effect.

[0033] Reference Figure 2 The shell 41 and the end cover 42 are connected and fixed, the shell 41 is sealed and rotatably connected to the pump shaft 2, and the end cover 42 is connected and fixed to the pump body 3.

[0034] Specifically, the shell 41 and the end cover 42 are fixed by bolt connection, and a sealing ring is provided between the shell 41 and the end cover 42. A circular hole larger than the pump shaft 2 is opened at the left end of the shell 41 and the right end of the end cover 42. An O-ring is embedded in the circular hole at the left end of the shell 41, and the O-ring is sleeved on the pump shaft 2.

[0035] Reference Figure 3-Figure 4 The telescopic member 7 includes a fixed seat 71 and a push ring 72 which are sleeved on the pump shaft 2. A sleeve 73 is fixedly connected to the fixed seat 71 on the side facing the push ring 72. A plurality of notches are formed in a circular shape at equal intervals on the sleeve 73. A plurality of arc plates 74 are fixedly connected to one side of the push ring 72. The arc plates 74 are slidably connected to the notches. The fixed seat 71 is fixedly connected to the pump shaft 2, and the push ring 72 is arranged between the fixed seat 71 and the moving ring 6.

[0036] Specifically, a plurality of screw holes are provided on the fixing seat 71, and bolts are installed in the screw holes to abut against the outer wall of the pump shaft 2, so that the fixing seat 71 is connected and fixed to the pump shaft 2, and the elastic member 8 can drive the push ring 72 to abut against the moving ring 6 by utilizing the telescopic sliding cooperation of the arc plate 74 and the sleeve 73.

[0037] Reference Figure 5-Figure 6 The arc-shaped spring piece 83 has a semicircular structure in the original length state, and has a poorly arc-shaped structure in the deformed state.

[0038] Specifically, the arc-shaped spring piece 83 is made of a metal material with bending deformation and automatic recovery. By setting a plurality of arc-shaped spring pieces 83, the number of force application points on the dynamic ring 6 and the area of ​​a single force application point can be increased, thereby applying a uniform thrust to the dynamic ring 6.

[0039] Reference Figure 6 One end of the arc-shaped spring piece 83 is rotatably connected to the fixed ring 81, and the other end of the arc-shaped spring piece 83 is fixedly connected to a connecting shaft 84. A plurality of arc-shaped holes 85 are provided on the fixed ring 81, and the connecting shaft 84 is slidably connected to the arc-shaped holes 85; a synchronous ring 86 is provided on the side of the fixed ring 81 away from the arc-shaped spring piece 83, and one end of the connecting shaft 84 passes through the arc-shaped hole 85 and is fixedly connected to the synchronous ring 86.

[0040] Specifically, the arc-shaped spring pieces 83 are elastically deformed by cooperating with the arc-shaped holes 85 through the connecting shaft 84, and the synchronization ring 86 is used to connect all the arc-shaped spring pieces 83, so that all the arc-shaped spring pieces 83 can be deformed synchronously, ensuring that the elastic member 8 always applies uniform pressure to the dynamic ring 6 in the axial direction.

[0041] Reference Figure 3 and Figure 5 A plurality of positioning slide plates 82 are fixedly arranged at equal intervals on the inner circle of the fixing ring 81 , and sliding grooves 75 are provided on the outer side walls of the sleeve 73 and the arc-shaped plate 74 , and the positioning slide plates 82 are in sliding contact with the sliding grooves 75 .

[0042] Specifically, the positioning slide plate 82 cooperates with the slide groove 75 to stably position the fixed ring 81 on the telescopic member 7 , so that the axial force of all elastic members 8 is limited to the same circular range, ensuring that the push ring 72 applies uniform pressure to the dynamic ring 6 .

[0043] Among them, refer to Figure 2 The arc-shaped spring pieces 83 in two adjacent elastic members 8 are staggered, so that the number of force application points on the dynamic ring 6 can be increased, further improving the uniformity of force application.

[0044] The sleeve 73 and the arc plate 74 can be disassembled, and the number of elastic members 8 can be increased or decreased to meet different application scenarios, thereby improving the scope of application. A single elastic member 8 can be replaced individually after being damaged, thereby reducing maintenance costs.

[0045] Example 2, reference Figure 6-Figure 9 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the cross-section of the connecting ring 91 is a T-shaped structure, a plurality of arc grooves 92 are opened on the inner ring of the connecting ring 91, the arc grooves 92 are slidably connected to the positioning slide 82, and a plurality of positioning blocks 93 are fixedly connected to the outer ring of the connecting ring 91.

[0046] Specifically, after the arc groove 92 is connected to the positioning slide plate 82, the connecting ring 91 has a certain rotation range. When the fixed ring 81 rotates following the pump shaft 2, the connecting ring 91 is affected by inertia and relatively rotates with the fixed ring 81. The positioning block 93 is affected by inertia and abuts against the connecting shaft 84, which increases the resistance of the arc spring piece 83 when it is restoring the deformation. As a result, when the dynamic ring 6 is impacted and moves away from the static ring 5, the resistance of the arc spring piece 83 to recovery is relatively large, which can avoid obvious displacement of the dynamic ring 6, ensure effective contact between the dynamic ring 6 and the static ring 5, and avoid medium leakage.

[0047] Reference Fig. 9 A plurality of dynamic pressure grooves 94 are formed in a circular shape and at equal intervals on one side of the connecting ring 91 away from the fixing ring 81. The width of the dynamic pressure groove 94 on the side close to the outer ring of the connecting ring 91 is greater than the width on the side close to the inner ring of the connecting ring 91. The depth of the inlet end of the dynamic pressure groove 94 is greater than the depth of the outlet end.

[0048] Specifically, after the positioning block 93 abuts against the connecting shaft 84, the connecting ring 91 rotates synchronously with the fixing ring 81. At this time, the inlet end of the dynamic pressure groove 94 cuts the air or liquid, thereby increasing the inertial effect of the connecting ring 91 and increasing the resistance applied by the positioning block 93 to the connecting shaft 84. At the same time, when the air or liquid passes through the inclined surface of the dynamic pressure groove 94, the rotational friction between the connecting ring 91 and the fixing ring 81 is increased, thereby improving the limiting stability of the connecting shaft 84 by the positioning block 93. The rest of the structure is the same as that of the first embodiment.

[0049] Example 3, reference Figure 1-Figure 2 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that a cooling chamber 43 is opened on the shell 41, and a pipe port 44 connected to the cooling chamber 43 is fixedly provided on the shell 41. A water pipe 10 is fixedly connected to the pipe port 44, and the other ends of the two water pipes 10 are respectively connected to the water inlet and the water outlet of the pump body 3.

[0050] Specifically, when the water pump is delivering cooling water, the water inlet of the pump body 3 delivers part of the cooling water to the cooling cavity 43 through the water conduit 10, and the cooling water absorbs the heat in the sealed shell 4 and then flows to the water outlet of the pump body 3 through another water conduit 10, so that the inside of the sealed shell 4 can be cooled, and the arc-shaped spring piece 83 is prevented from reducing the elastic effect in a long-term high temperature environment. The rest of the structure is the same as that of Example 2.

[0051] Based on Examples 1-3, the working principle of the present invention is as follows: the rotation of the motor 1 drives the pump shaft 2 to rotate, and the pump shaft 2 drives the impeller in the pump body 3 to rotate, so that the pump body 3 delivers cooling water to cool the nuclear power plant equipment. During the rotation of the pump shaft 2, the arc-shaped spring piece 83 in a compressed and force-accumulated state applies a thrust to the push ring 72, so that the push ring 72 abuts against the moving ring 6, so that the moving ring 6 and the static ring 5 maintain a rotational contact, thereby avoiding leakage of the medium between the pump body 3 and the sealing shell 4. At the same time, when the pump shaft 2 rotates rapidly, the connecting ring 91 is affected by inertia to drive the positioning block 93 to abut against the connecting shaft 84, preventing the arc-shaped spring piece 83 from deforming in the recovery direction, thereby avoiding the moving ring 6 from moving in the opposite direction when impacted, and ensuring that the moving ring 6 always maintains effective contact with the static ring 5.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A cooling water pump for nuclear power plant equipment, comprising a motor, wherein the output end of the motor is connected to a pump shaft through a coupling, the other end of the pump shaft is connected to a pump body, and a sealing mechanism is commonly connected between the pump body and the pump shaft, characterized in that: The sealing mechanism comprises a sealing shell, which is composed of a shell and an end cover. A static ring is fixedly connected inside the end cover. A dynamic ring is provided on the side of the static ring facing the shell. The pump shaft movably passes through the shell, the static ring and the end cover. The dynamic ring is sleeved on the pump shaft. A telescopic member is provided on the side of the dynamic ring away from the static ring. The telescopic member is sleeved on the pump shaft, and a plurality of elastic members are provided on the telescopic member. The elastic member drives the telescopic member to stretch so that the dynamic ring abuts against the static ring. The elastic member comprises a fixing ring sleeved on the telescopic member, and a plurality of arc-shaped spring pieces are evenly distributed on one side of the fixing ring; A positioning member is provided on the side of the fixing ring facing the arc-shaped spring piece. The positioning member includes a connecting ring rotatably connected to the fixing ring. A plurality of positioning blocks are evenly distributed on the outer ring of the connecting ring. The positioning blocks are used to limit the restoring deformation of the arc-shaped spring piece.

2. The cooling water pump for nuclear power plant equipment according to claim 1, characterized in that: The shell and the end cover are connected and fixed, the shell and the pump shaft are sealingly rotatably connected, and the end cover is connected and fixed to the pump body.

3. The cooling water pump for nuclear power plant equipment according to claim 1, characterized in that: The telescopic member comprises a fixed seat and a push ring sleeved on the pump shaft, the fixed seat is fixedly connected with a sleeve on one side facing the push ring, a plurality of notches are formed in an annular shape and at equal intervals on the sleeve, a plurality of arc plates are fixedly connected with one side of the push ring, and the arc plates are slidably connected with the notches; The fixing seat is connected and fixed to the pump shaft, and the push ring is arranged between the fixing seat and the moving ring.

4. The cooling water pump for nuclear power plant equipment according to claim 1, characterized in that: The arc-shaped spring piece is in a semicircular structure in the original length state, and is in a poorly arc-shaped structure in the deformed state.

5. The cooling water pump for nuclear power plant equipment according to claim 1, characterized in that: One end of the arc-shaped spring piece is rotatably connected to the fixing ring, and the other end of the arc-shaped spring piece is fixedly connected to a connecting shaft. The fixing ring is provided with a plurality of arc-shaped holes, and the connecting shaft is slidably connected to the arc-shaped holes. A synchronization ring is arranged on one side of the fixing ring away from the arc-shaped spring piece, and one end of the connecting shaft passes through the arc-shaped hole and is connected and fixed to the synchronization ring.

6. The cooling water pump for nuclear power plant equipment according to claim 3, characterized in that: A plurality of positioning slide plates are fixedly arranged at equal intervals on the inner ring of the fixed ring, and sliding grooves are provided on the outer side walls of the sleeve and the arc-shaped plate, and the positioning slide plates are in sliding contact with the sliding grooves.

7. The cooling water pump for nuclear power plant equipment according to claim 6, characterized in that: The cross section of the connecting ring is T-shaped, a plurality of arc grooves are provided on the inner ring of the connecting ring, the arc grooves are slidably connected to the positioning slide plate, and a plurality of positioning blocks are fixedly connected to the outer ring of the connecting ring.

8. The cooling water pump for nuclear power plant equipment according to claim 7, characterized in that: A plurality of dynamic pressure grooves are formed in an annular shape and at equal intervals on one side of the connecting ring away from the fixed ring. The width of the dynamic pressure groove close to the outer ring of the connecting ring is greater than the width close to the inner ring of the connecting ring. The depth of the inlet end of the dynamic pressure groove is greater than the depth of the outlet end.

9. The cooling water pump for nuclear power plant equipment according to claim 1, characterized in that: A cooling cavity is provided on the shell, a pipe connection port connected to the cooling cavity is fixedly provided on the shell, a water pipe is fixedly connected to the pipe connection port, and the other ends of the two water pipes are respectively connected to the water inlet and the water outlet of the pump body.

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