Packing gland stud anti-fracture device for nuclear power pump

Abstract

The utility model relates to a nuclear power pump packing gland stud fracture prevention device which comprises a sleeve, the sleeve is used for being inserted into a stud hole of a packing gland, the sleeve is provided with a through hole penetrating through the sleeve, and a fixing stud of the packing gland can penetrate through the through hole. After the nut of the fixing stud of the packing gland is loosened, the sleeve can replace the fixing stud to bear a part of radial shearing force, the fixing stud is protected against breakage, the service life of the fixing stud is prolonged, the safety and reliability of pumping equipment are further improved, the availability rate of the pumping equipment is increased, the daily damage risk is reduced, and the service life of the pumping equipment is prolonged. And the maintenance cost and the maintenance frequency are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of packing gland stud protection and installation, in particular to a packing gland stud anti-fracture device for a nuclear power pump. Background Art

[0002] When dismantling and overhauling nuclear power plant pumping equipment, such as vacuum pump units, the installation of packing seals is an important part of ensuring equipment availability. During the overhaul process, due to the long-term operation of the equipment, the fixing nuts of the packing gland studs are prone to loosening, and radial shear force is generated on the studs of the packing gland driven by the pump shaft and packing, causing the studs of the packing gland to break. In order to solve this problem, it is urgent to design a packing gland stud protection device for conventional island vacuum pump units for nuclear power. Utility Model Content

[0003] The utility model aims to provide a packing gland stud anti-fracture device for a nuclear power pump to protect the packing gland studs and eliminate the risk of the packing gland studs breaking due to loosening of the packing gland studs during operation.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A packing gland stud anti-fracture device for a nuclear power pump comprises a sleeve, the sleeve is used to be inserted into the stud hole of the packing gland, the sleeve has a through hole penetrating the sleeve, and the through hole is used for the fixing stud of the packing gland to pass through.

[0006] In one embodiment of the present application, the length of the sleeve is greater than the length of the stud hole of the packing gland.

[0007] In one embodiment of the present application, a limiting portion is provided at least at one end of the sleeve, the through hole passes through the limiting portion, and a limiting step surface for contacting and cooperating with the surface of the packing gland is formed between the limiting portion and the sleeve.

[0008] In one embodiment of the present application, the limiting portion is provided at one end of the sleeve away from the stuffing box, and the limiting step surface is used to contact and cooperate with a surface of the packing gland on one side away from the stuffing box.

[0009] In one embodiment of the present application, the through hole is a threaded hole, and the threaded hole is used to cooperate with the thread of the fixing stud.

[0010] In one embodiment of the present application, a spring washer is further included. The spring washer is used to be sleeved on the sleeve and is located between the limiting portion and a side surface of the packing gland away from the stuffing box.

[0011] In one embodiment of the present application, a plurality of expansion and contraction slots are arranged at circumferential intervals at one end of the sleeve away from the limiting portion, and the expansion and contraction slots extend from the end of the sleeve away from the limiting portion toward the limiting portion, and the expansion and contraction slots are used to enable the end of the sleeve away from the limiting portion to expand and contract radially.

[0012] In one embodiment of the present application, the limiting parts are respectively provided at both ends of the sleeve, at least one of the limiting parts is detachably connected to the sleeve, and the two limiting parts cooperate to clamp and fix the sleeve to the packing gland.

[0013] In one embodiment of the present application, a fastening nut is further included, and the fastening nut cooperates with the fixing stud to position the sleeve.

[0014] In one embodiment of the present application, one of the mating surfaces of the fastening nut and the sleeve is provided with a conical boss, and the other of the mating surfaces of the fastening nut and the sleeve is provided with a conical groove, and the conical groove cooperates with the conical boss to make the fastening nut coaxial with the sleeve.

[0015] It can be seen from the above technical scheme that the utility model discloses a packing gland stud anti-fracture device for a nuclear power pump, and the packing gland stud anti-fracture device for a nuclear power pump includes a sleeve, which is used to be inserted into the stud hole of the packing gland, and the sleeve has a through hole running through the sleeve, and the through hole is used for the fixing stud of the packing gland to pass through. By arranging the sleeve between the fixing stud and the packing gland, after the nut of the fixing stud of the packing gland is loosened, the sleeve can replace the fixing stud to share a part of the radial shear force, thereby protecting the fixing stud from fracture, extending the service life of the fixing stud, and thus increasing the safety and reliability of the pumping equipment, improving the availability of the pumping equipment, reducing the risk of daily damage, and reducing the maintenance cost and the number of maintenance times. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of a packing gland stud anti-fracture device for a nuclear power pump provided by an embodiment of the utility model;

[0018] Figure 2 A front view of a packing gland stud anti-fracture device for a nuclear power pump provided by an embodiment of the utility model;

[0019] Figure 3 A cross-sectional view of a packing gland stud anti-fracture device for a nuclear power pump provided by an embodiment of the utility model;

[0020] Figure 4 The utility model is a schematic diagram of the assembly of the anti-fracture device of the packing gland stud for the nuclear power pump provided in the embodiment of the present invention.

[0021] In the figure:

[0022] 1 is a sleeve; 2 is a through hole; 3 is a limiting portion; 4 is a packing gland; 5 is a fixing stud. DETAILED DESCRIPTION

[0023] The core of the utility model is to provide a packing gland stud anti-fracture device for a nuclear power pump. The structural design of the packing gland stud anti-fracture device for a nuclear power pump enables it to protect the packing gland studs and eliminate the risk of stud fracture caused by loosening of the packing gland studs during operation.

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figures 1 to 4 , Figure 1 A schematic diagram of the structure of a packing gland stud anti-fracture device for a nuclear power pump provided by an embodiment of the utility model, Figure 2 A front view of a packing gland stud anti-fracture device for a nuclear power pump provided by an embodiment of the utility model, Figure 3 A cross-sectional view of a packing gland stud anti-fracture device for a nuclear power pump provided by an embodiment of the utility model, Figure 4 The utility model is a schematic diagram of the assembly of the anti-fracture device of the packing gland stud for the nuclear power pump provided in the embodiment of the present invention.

[0026] The utility model discloses a packing gland stud anti-fracture device for a nuclear power pump, which comprises a sleeve 1, which is used to be inserted into the stud hole of the packing gland 4, and the sleeve 1 has a through hole 2 penetrating the sleeve 1, and the through hole 2 is used for the fixing stud 5 of the packing gland 4 to pass through.

[0027] Compared with the prior art, the packing gland stud anti-fracture device for a nuclear power pump provided in an embodiment of the utility model adopts a sleeve 1 structure. By arranging the sleeve 1 between the fixed stud 5 and the packing gland 4, after the nut of the fixed stud 5 of the packing gland 4 is loosened, the sleeve 1 can replace the fixed stud 5 to share a part of the radial shear force, thereby protecting the fixed stud 5 from fracture and extending the service life of the fixed stud 5, thereby increasing the safety and reliability of the pumping equipment, improving the availability of the pumping equipment, reducing the risk of daily damage, and reducing the maintenance cost and the number of maintenance times.

[0028] In order to enable the sleeve 1 to provide a good protective effect on the fixing stud 5, in the embodiment of the utility model, as shown in FIG. Figure 4 As shown, the length of the above-mentioned sleeve 1 is greater than the length of the stud hole of the packing gland 4. By making the length of the sleeve 1 long enough, direct contact between the fixing stud 5 and the packing gland 4 can be avoided, thereby avoiding the fixing stud 5 from being subjected to radial shear force applied by the packing gland 4 as much as possible.

[0029] like Figures 1 to 3 As shown, in the embodiment of the utility model, a limiting portion 3 is provided at least at one end of the sleeve 1, and the limiting portion 3 is an annular structure, and its diameter is larger than the diameter of the sleeve 1, that is, the limiting portion 3 is an annular boss structure protruding radially relative to the sleeve 1, and the through hole 2 passes through the limiting portion 3, and a limiting step surface for contacting and cooperating with the surface of the packing gland 4 is formed between the limiting portion 3 and the sleeve 1, so as to axially limit the anti-fracture device of the packing gland stud for the nuclear power pump.

[0030] Specific as Figures 1 to 3 In the illustrated embodiment, there is only one limit portion 3 on the sleeve 1, and the limit portion 3 is arranged at the end of the sleeve 1 away from the stuffing box. The limit step surface is used to contact and cooperate with the surface of the side of the packing gland 4 away from the stuffing box. When in use, the packing gland stud anti-fracture device for the nuclear power pump is preferably pressed and fixed on one side of the limit portion 3 with the help of other devices.

[0031] Of course, the axial positioning of the packing gland stud anti-fracture device for a nuclear power pump can also be achieved by other means. For example, in one embodiment of the utility model, the through hole 2 is a threaded hole, and the threaded hole is used to cooperate with the thread of the fixing stud 5. When in use, the packing gland stud anti-fracture device for a nuclear power pump can be threadedly matched with the fixing stud 5, and the limiting step surface can be pressed against the surface of the packing gland 4.

[0032] To further optimize the above technical solution, in order to prevent the anti-fracture device of the packing gland studs for nuclear power pumps and the fixing studs 5 from loosening, in one embodiment of the utility model, the anti-fracture device of the packing gland studs for nuclear power pumps also includes a spring washer, which is used to be sleeved on the sleeve 1 and is located between the limiting portion 3 and the side surface of the packing gland 4 away from the stuffing box. The spring washer is used to apply a pre-tightening force to the anti-fracture device of the packing gland studs for nuclear power pumps, so that the anti-fracture device of the packing gland studs for nuclear power pumps and the fixing studs 5 are tightly matched to prevent loosening between the two.

[0033] Preferably, in one embodiment of the utility model, a plurality of expansion and contraction seams are arranged at circumferential intervals at one end of the sleeve 1 away from the limiting portion 3, and the expansion and contraction seams extend from the end of the sleeve 1 away from the limiting portion 3 toward the limiting portion 3. The expansion and contraction seams are used to enable the end of the sleeve 1 away from the limiting portion 3 to expand and contract radially. By utilizing this variable diameter structure, the sleeve 1 can be tightly embraced on the fixed stud 5 and / or tightened on the stud hole of the packing gland 4, thereby increasing the stability of the anti-fracture device of the packing gland stud for the nuclear power pump.

[0034] It should be noted that limiting parts 3 can also be respectively provided at both ends of the sleeve 1, at least one limiting part 3 is detachably connected to the sleeve 1, and the two limiting parts 3 cooperate to clamp the sleeve 1 to the packing gland 4. Through this structure, the packing gland stud anti-fracture device for the nuclear power pump can be effectively fixed to the packing gland 4.

[0035] In one embodiment, the packing gland stud anti-fracture device for nuclear power pumps further includes a fastening nut, which cooperates with the fixing stud 5 to position the sleeve 1. Further, one of the mating surfaces of the fastening nut and the sleeve 1 is provided with a conical boss, and the other of the mating surfaces of the fastening nut and the sleeve 1 is provided with a conical groove, and the conical groove cooperates with the conical boss to make the fastening nut and the sleeve 1 coaxial.

[0036] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0037] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A packing gland stud anti-fracture device for a nuclear power pump, characterized in that: It comprises a sleeve, which is used to be inserted into the stud hole of the packing gland, and the sleeve has a through hole penetrating the sleeve, and the through hole is used for the fixing stud of the packing gland to pass through.

2. The anti-fracture device for packing gland studs for nuclear power pumps according to claim 1 is characterized in that: The length of the sleeve is greater than the length of the stud hole of the packing gland.

3. The anti-fracture device for packing gland studs for nuclear power pumps according to claim 1 is characterized in that: A limiting portion is disposed at at least one end of the sleeve, the through hole passes through the limiting portion, and a limiting step surface for contacting and cooperating with the surface of the packing gland is formed between the limiting portion and the sleeve.

4. The anti-fracture device for packing gland studs for nuclear power pumps according to claim 3 is characterized in that: The limiting portion is arranged at one end of the sleeve away from the stuffing box, and the limiting step surface is used for contacting and cooperating with the surface of one side of the packing gland away from the stuffing box.

5. The anti-fracture device for packing gland studs for nuclear power pumps according to claim 4 is characterized in that: The through hole is a threaded hole, and the threaded hole is used to be threadedly matched with the fixing stud.

6. The anti-fracture device for packing gland studs for nuclear power pumps according to claim 5 is characterized in that: It also includes a spring washer, which is used to be sleeved on the sleeve and is located between the limiting portion and a side surface of the packing gland away from the stuffing box.

7. The anti-fracture device for packing gland studs for nuclear power pumps according to claim 4 is characterized in that: The end of the sleeve away from the limiting portion is provided with a plurality of expansion and contraction slits at intervals along the circumferential direction. The expansion and contraction slits extend from the end of the sleeve away from the limiting portion toward the limiting portion, and are used to enable the end of the sleeve away from the limiting portion to expand and contract radially.

8. The anti-fracture device for packing gland studs for nuclear power pumps according to claim 3 is characterized in that: The limiting parts are respectively arranged at both ends of the sleeve, at least one of the limiting parts is detachably connected to the sleeve, and the two limiting parts cooperate to clamp and fix the sleeve to the packing gland.

9. The anti-fracture device for packing gland studs for nuclear power pumps according to any one of claims 1 to 8, characterized in that: A fastening nut is also included, and the fastening nut cooperates with the fixing stud to position the sleeve.

10. The anti-fracture device for packing gland studs for nuclear power pumps according to claim 9, characterized in that: One of the mating surfaces of the fastening nut and the sleeve is provided with a conical boss, and the other of the mating surfaces of the fastening nut and the sleeve is provided with a conical groove, and the conical groove cooperates with the conical boss to make the fastening nut and the sleeve coaxial.

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