Shaft sleeve of circulating pump

Abstract

The utility model discloses a shaft sleeve of a circulating pump, and relates to the field of nuclear power equipment.The shaft sleeve comprises a shaft sleeve external part and a shaft sleeve internal part movably inserted into the shaft sleeve external part, and limiting plates are detachably inserted into the joint of the shaft sleeve external part and the shaft sleeve internal part at equal intervals in a surrounding mode; the outer end faces of the limiting plates are flush with the outer end faces of the shaft sleeve outer part and the shaft sleeve inner part. Fastening mechanisms for limiting and fixing the limiting plates are arranged on the outer surface of the shaft sleeve outer part in an equally-divided surrounding mode. In conclusion, when the device is used for a long time and the shaft sleeve is abraded and needs to be replaced, only the limiting plate needs to be pulled out, the internal parts of the shaft sleeve are replaced, the replacement mode can reduce the use cost, and meanwhile, the internal shapes of the internal parts of the shaft sleeve are set to be different shapes, so that multiple shaft sleeves do not need to be pre-stored, and the cost is further reduced.

Description

Technical Field

[0001] The present application relates to the field of nuclear power equipment, and in particular to a shaft sleeve of a circulating pump. Background Art

[0002] The PCS recirculation pump is a recirculation pump commonly used in the PCS system of nuclear power plants. The PCS system is also called the passive containment cooling system. The function of this system is to: when a loss of coolant (LOCA) or main steam line rupture (MSLB) accident occurs in the containment, it can remove the heat inside the containment, reduce the temperature and pressure of the containment, reduce the pressure difference between the containment atmosphere and the external environment, and limit the release of radioactive materials after the accident. PCS is also used as a water supply source for the spent fuel pool. The main components of the PCS system include: passive containment cooling water storage tank (PCCWST), air baffle, air inlet and air outlet, and water distribution system. In addition, there is a passive containment cooling auxiliary water storage tank (PCCAWST) and two PCS recirculation pumps. The recirculation pump is used on site to provide additional cooling water from the PCCAWST to the PCS system, and can also provide backup water for the earthquake-resistant water tower of the fire protection system.

[0003] For example, the sleeve for a PCS recirculation pump disclosed in patent number CN201220118784.4 has the following deficiencies in actual use:

[0004] The mechanical seal chamber of the PCS recirculation pump is formed between the shaft sleeve, the pump cover and the mechanical seal used in the above patent. Since the shaft sleeve is an integrally formed arrangement, when the shaft sleeve is worn out after long-term use and needs to be replaced, the entire shaft sleeve is often replaced. Due to the high price of nuclear power equipment, this replacement method will lead to an increase in the cost of use. At the same time, the internal shapes of the shaft sleeve are different, so multiple shaft sleeves need to be pre-stored, which further increases the cost. Utility Model Content

[0005] In order to improve the problem of high maintenance cost of a PCS recirculation pump sleeve, the present application provides a circulation pump sleeve.

[0006] The shaft sleeve of a circulating pump provided in the present application adopts the following technical solution:

[0007] A shaft sleeve of a circulating pump, comprising a shaft sleeve outer component and a shaft sleeve inner component movably plugged into the shaft sleeve outer component, wherein a limit plate is equally divided and removably plugged in around the connection between the shaft sleeve outer component and the shaft sleeve inner component, and the outer end surface of the limit plate is flush with the outer end surface of the shaft sleeve outer component and the shaft sleeve inner component;

[0008] The outer surface of the shaft sleeve outer component is equally surrounded by a fastening mechanism for limiting and fixing the limiting plate.

[0009] By adopting the above technical solution, the limiting plate is inserted between the outer part of the sleeve and the inner part of the sleeve to form the basic structure of the sleeve body, and further fixation can be achieved through the fastening mechanism.

[0010] Preferably, the inner wall of the shaft sleeve outer component is equally divided into two rectangular grooves, and one end of the two rectangular grooves is opened to the end surface adjacent to the shaft sleeve outer component.

[0011] By adopting the above technical solution, one end of the rectangular groove 2 is opened to the end surface adjacent to the sleeve outer component, which can cooperate with the limit plate to prevent the sleeve outer component and the sleeve inner component from rotating, and at the same time can achieve a tightening effect.

[0012] Preferably, the inner wall of the shaft sleeve inner component is equally divided into a rectangular groove one, and one end of the rectangular groove one is opened to the end surface adjacent to the shaft sleeve inner component.

[0013] By adopting the above technical solution, an inner wall of the rectangular groove fits with the surface of the limiting plate to achieve a limiting effect.

[0014] Preferably, the rectangular groove 2 is the same in length and width as the rectangular groove 1, and the rectangular groove 1 and the rectangular groove 2 are spliced ​​into a rectangular opening for the limiting plate to be inserted into.

[0015] By adopting the above technical solution, the rectangular opening facilitates the insertion and limiting fixation of the limiting plate.

[0016] Preferably, a plurality of countersunk holes are equally divided around the outer surface of the sleeve outer component, an internal threaded hole is formed at the bottom of each countersunk hole, and movable grooves corresponding to the countersunk holes and connected to the internal threaded holes are equally divided around the inside of the sleeve outer component.

[0017] By adopting the above technical solution, the countersunk hole can hide the head of the hexagon socket bolt to avoid interference between the head and other components.

[0018] Preferably, the fastening mechanism comprises a hexagon socket bolt located inside the countersunk hole and threadedly arranged with the internal threaded hole, and the stem of the hexagon socket bolt extends into the movable groove.

[0019] By adopting the above technical solution, the hexagon socket bolt can move in the movable groove with the trapezoidal insert block.

[0020] Preferably, a limiting plate is fixedly provided at the lower end of the hexagon socket bolt rod, and the limiting plate is rotatably arranged with the trapezoidal plug block via a T-slot.

[0021] By adopting the above technical solution, the setting of the limit plate can ensure that the hexagon socket bolt can rotate and at the same time drive the trapezoidal plug block to move in the T-slot.

[0022] Preferably, the upper end of the limit plate located on one side of the hexagon socket bolt is provided with an insertion groove for the trapezoidal plug-in block to be plugged in and engaged, and one side of the inner cavity of the insertion groove is provided with an inclined surface;

[0023] When the limiting plate is completely inserted between the shaft sleeve outer component and the shaft sleeve inner component, the insertion groove corresponds to the trapezoidal insert block.

[0024] By adopting the above technical solution, the trapezoidal plug block can abut against the inclined surface and push the limiting plate to move at the same time.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. After inserting the inner part of the sleeve into the outer part of the sleeve, insert the limit plate and lock it through the fastening mechanism to realize the assembly of the sleeve body. When the sleeve is worn out after long-term use of the device and needs to be replaced, you only need to pull out the limit plate and replace the inner part of the sleeve. This replacement method will reduce the cost of use. At the same time, the internal shape of the inner part of the sleeve is set to different shapes, so there is no need to pre-store multiple sleeves to further reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is an overall axonometric diagram of the shaft sleeve of this application;

[0028] Figure 2 This is a schematic cross-sectional view of the shaft sleeve of the present application;

[0029] Figure 3 This is a schematic diagram of the positions of the countersunk holes and movable grooves of the present application;

[0030] Figure 4 This is a partially enlarged schematic diagram of the separation of the rectangular groove 1 and the rectangular groove 2 of the present application;

[0031] Figure 5 This is a cross-sectional schematic diagram of the fastening mechanism of the present application.

[0032] Reference numerals: 1, shaft sleeve outer part; 2, shaft sleeve inner part;

[0033] 3. Fastening mechanism; 31. Hexagon socket bolt; 32. Trapezoidal insert; 33. Limiting plate; 34. T-slot;

[0034] 4. Limiting plate; 5. Countersunk hole; 6. Movable groove; 7. Rectangular groove 1; 8. Internal threaded hole; 9. Rectangular groove 2; 10. Inclined surface; 11. Insertion groove. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-5 This application is described in further detail.

[0036] An embodiment of the present application discloses a shaft sleeve of a circulating pump.

[0037] Example 1

[0038] All the structures in this case are assembled to form the sleeve body.

[0039] Reference Figure 1 , 4 A shaft sleeve of a circulating pump comprises a shaft sleeve outer part 1 and a shaft sleeve inner part 2 located inside the shaft sleeve outer part 1, wherein the inner wall of the shaft sleeve outer part 1 abuts against the outer surface of the shaft sleeve inner part 2 and can realize unidirectional movable plug-in (such as Figure 2 As shown, rectangular groove 29 is equally divided and surrounded on the inner wall of the sleeve outer component 1, one end of rectangular groove 29 extends to the end face adjacent to the sleeve outer component 1, rectangular groove 17 is equally divided and surrounded on the inner wall of the sleeve inner component 2, there are at least four rectangular grooves 17 and 29, rectangular groove 17 and rectangular groove 29 are not bidirectional through grooves, one end of rectangular groove 17 extends to the end face adjacent to the sleeve inner component 2, rectangular groove 29 has the same length and width as rectangular groove 17, rectangular groove 17 and rectangular groove 29 are spliced ​​into a rectangular opening, the limit plate 4 can be detachably inserted in the rectangular opening, the outer end face of the limit plate 4 is flush with the outer end face of the sleeve outer component 1 and the outer end face of the sleeve inner component 2, so as to avoid the protrusion of the limit plate 4 and the wear of the end faces of other structures.

[0040] Through the above arrangement, the user inserts the required sleeve inner component 2 into the sleeve outer component 1, and aligns the rectangular groove 2 9 with the rectangular groove 1 7 to form a rectangular opening. Subsequently, the limiting plate 4 is inserted into the rectangular opening, and the sleeve outer component 1 and the sleeve inner component 2 are plugged and fixed to prevent the sleeve inner component 2 from rotating on the inner wall of the sleeve outer component 1, so that the sleeve inner component 2 is integrated with the sleeve outer component 1.

[0041] Reference Figure 3 The countersunk holes 5 are equally divided and arranged around the outer surface of the sleeve outer component 1. There are multiple countersunk holes 5 and the number is the same as the number of the limiting plates 4. An internal threaded hole 8 is opened in the middle of the bottom of the inner cavity of each countersunk hole 5. The inner part of the sleeve outer component 1 is equally divided and arranged around the inner part and corresponding to the countersunk holes 5. The movable grooves 6 are connected with the internal threaded holes 8, and the movable grooves 6 are set as rectangular grooves.

[0042] Through the above arrangement, the counterbore 5 is configured as a circular hole with a diameter larger than the diameter of the head of the hexagon socket bolt 31 , and the hexagon socket bolt 31 is continuously screwed in so that its rod portion can be located in the movable groove 6 and move longitudinally.

[0043] Reference Figure 1 , 2, 3, 5, the outer surface of the sleeve outer member 1 is equally divided and surrounded by a fastening mechanism 3 for limiting and fixing the limit plate 4, the fastening mechanism 3 includes a hexagon socket bolt 31 located inside the countersunk hole 5, the rod thread of the hexagon socket bolt 31 is threadedly arranged with the internal threaded hole 8, the rod of the hexagon socket bolt 31 extends into the movable groove 6, the lower end of the rod of the hexagon socket bolt 31 is fixed to the middle of the limit plate 33, the diameter of the limit plate 33 is larger than the diameter of the rod of the hexagon socket bolt 31, a T-slot 34 is opened in the middle of the upper end of the trapezoidal plug block 32, the limit plate 33 and the lower half of the rod of the hexagon socket bolt 31 are both located in the T-slot 34 and can be implemented The limiting plate 4 is now rotated and limited, and an insertion groove 11 is opened at the upper end of the limiting plate 4 on one side of the hexagon socket bolt 31, and the trapezoidal plug block 32 is plugged into the insertion groove 11. One side of the inner cavity of the insertion groove 11 is provided with an inclined surface 10, and the slope of the inclined surface 10 is greater than the slope of the inclined surface of the trapezoidal plug block 32, so that when the trapezoidal plug block 32 continuously moves toward the axis center of the sleeve outer component 1, the limiting plate 4 can be pushed toward the inside of the rectangular opening through the inclined surface 10, thereby realizing the clamping of the limiting plate 4. When the limiting plate 4 is fully inserted between the sleeve outer component 1 and the sleeve inner component 2, the insertion groove 11 corresponds to the trapezoidal plug block 32.

[0044] With the above arrangement, the user rotates the hexagon socket bolt 31 with the hexagonal tool, thereby causing the hexagon socket bolt 31 to rotate in the internal threaded hole 8, and the rod of the hexagon socket bolt 31 drives the limit plate 33 to rotate in the T-slot 34 of the trapezoidal plug block 32 and pushes the trapezoidal plug block 32 to move toward the axis of the sleeve outer component 1, and the trapezoidal plug block 32 will be inserted into the insertion groove 11, and the surface of the trapezoidal plug block 32 will abut against the inclined surface 10, so that the trapezoidal plug block 32 is continuously stressed and squeezes the limit plate 4 through the inclined surface 10, thereby firmly fixing the limit plate 4 between the sleeve outer component 1 and the sleeve inner component 2, effectively preventing the limit plate 4 from detaching, and at this time, the head of the hexagon socket bolt 31 will completely enter the countersunk hole 5, avoiding the head protrusion from interfering with external devices and causing wear.

[0045] The implementation principle of a shaft sleeve of a circulating pump in the embodiment of the present application is:

[0046] First, insert the shaft sleeve inner part 2 into the shaft sleeve outer part 1, and then insert the limit plate 4 between the rectangular groove 1 7 and the rectangular groove 2 9, and then rotate the hexagon socket bolt 31 to drive the trapezoidal plug 32 to move until it moves into the insertion groove 11 of the limit plate 4 and abuts against the inclined surface 10, and then as the hexagon socket bolt 31 continues to rotate, the trapezoidal plug 32 continues to squeeze the limit plate 4 to fix the limit plate 4.

[0047] In summary, when the sleeve of the device is used for a long time and becomes worn and needs to be replaced, it is only necessary to pull out the limit plate 4 and replace the inner part 2 of the sleeve. This replacement method will reduce the cost of use. At the same time, the internal shape of the inner part 2 of the sleeve is set to different shapes, so there is no need to pre-store multiple sleeves to further reduce costs.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A shaft sleeve of a circulating pump, characterized in that: The invention comprises a shaft sleeve outer component (1) and a shaft sleeve inner component (2) movably plugged into the shaft sleeve outer component (1), wherein a limit plate (4) is detachably plugged in and equally surrounded the connection between the shaft sleeve outer component (1) and the shaft sleeve inner component (2), and the outer end surface of the limit plate (4) is flush with the outer end surfaces of the shaft sleeve outer component (1) and the shaft sleeve inner component (2); The outer surface of the shaft sleeve outer component (1) is equally surrounded by a fastening mechanism (3) for limiting and fixing the limiting plate (4).

2. A shaft sleeve for a circulating pump according to claim 1, characterized in that: The inner wall of the shaft sleeve outer component (1) is equally divided into two rectangular grooves (9), and one end of the two rectangular grooves (9) is opened to the end surface adjacent to the shaft sleeve outer component (1).

3. A shaft sleeve for a circulating pump according to claim 2, characterized in that: The inner wall of the shaft sleeve inner component (2) is equally divided into a rectangular groove (7) and surrounded by one end of the rectangular groove (7) to be adjacent to the end surface of the shaft sleeve inner component (2).

4. A shaft sleeve for a circulating pump according to claim 3, characterized in that: The rectangular groove 2 (9) has the same length and width as the rectangular groove 1 (7), and the rectangular groove 1 (7) and the rectangular groove 2 (9) are spliced ​​to form a rectangular opening for the limiting plate (4) to be inserted.

5. The shaft sleeve of a circulating pump according to claim 1, characterized in that: The outer surface of the shaft sleeve outer component (1) is equally divided and surrounded by a plurality of countersunk holes (5), each countersunk hole (5) is provided with an internal threaded hole (8) at the bottom, and the interior of the shaft sleeve outer component (1) is equally divided and surrounded by movable grooves (6) corresponding to the countersunk holes (5) and connected to the internal threaded holes (8).

6. A shaft sleeve for a circulating pump according to claim 5, characterized in that: The fastening mechanism (3) comprises a hexagon socket bolt (31) located inside the countersunk hole (5) and threadedly arranged with the internal threaded hole (8), and the stem of the hexagon socket bolt (31) extends into the movable groove (6).

7. A shaft sleeve for a circulating pump according to claim 6, characterized in that: A limiting plate (33) is fixedly provided at the lower end of the rod of the hexagon socket bolt (31), and the limiting plate (33) is rotatably arranged with the trapezoidal insert block (32) via a T-shaped slot (34).

8. A shaft sleeve for a circulating pump according to claim 7, characterized in that: The upper end of the limit plate (4) located on one side of the hexagon socket bolt (31) is provided with an insertion groove (11) for the trapezoidal plug block (32) to be plugged in and engaged, and one side of the inner cavity of the insertion groove (11) is provided with an inclined surface (10); When the limiting plate (4) is completely inserted between the shaft sleeve outer component (1) and the shaft sleeve inner component (2), the insertion groove (11) corresponds to the trapezoidal insert block (32).

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