Seal assembly and vertical molten salt pump

Abstract

The utility model provides a kind of sealing assembly and vertical fused salt pump, the sealing assembly includes the pump seat with mounting hole, pump shaft, throttle bushing, gland, elastic connecting structure, and pump shaft is equipped with shaft sleeve;Throttle bushing connects the gap between pump seat throttle bushing and shaft sleeve and forms sealed channel, along gas leakage direction, sealed channel is divided into first sealing section and second sealing section, and damping sealing structure for generating reverse damping is equipped in first sealing section, and sealing filler is filled in second sealing section;At least part of gland can be inserted into second sealing section;Elastic connecting structure is used to push gland and compress sealing filler automatically by the elastic force of elastic connecting structure to maintain the necessary sealing specific pressure of sealing filler, and sealing filler cooperates with damping sealing structure and forms two-stage sealing barrier of active damping pressure reduction and end filler plugging, which significantly improves sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of pump equipment technology, and in particular to a sealing component and a vertical molten salt pump. Background Technology

[0002] In solar thermal power generation systems, molten salt is commonly used as a heat transfer and storage medium to achieve efficient energy absorption, storage, and continuous release. The vertical molten salt pump is a key piece of equipment for transporting high-temperature molten salt, typically operating at around 600℃. It is responsible for transporting molten salt from the storage tank to the absorber or heat exchanger, and its stable and reliable operation is crucial to the overall system efficiency and safety. In actual operation, because the vertical molten salt pump operates under harsh conditions of high temperature and strong corrosion, high-temperature gas inevitably exists within the mounting hole. This high-temperature gas poses a risk of leakage along the pump shaft due to the pressure difference between the inside and outside of the mounting hole. Once this high-temperature gas leaks, it will not only cause environmental pollution but also endanger the personal safety of on-site inspectors and operators. Therefore, how to prevent high-temperature gas leakage along the pump shaft under high-temperature and highly corrosive molten salt conditions has become an urgent technical problem to be solved. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a sealing component and a vertical molten salt pump for preventing high-temperature gas leakage along the pump shaft under high temperature and high corrosion molten salt conditions.

[0004] The above-mentioned objective of this utility model can be achieved by the following technical solution: this utility model provides a sealing assembly, comprising:

[0005] Pump base with mounting holes;

[0006] A pump shaft, which is rotatably inserted into the mounting hole, and a bushing is provided on the pump shaft;

[0007] A throttling bushing is disposed on the periphery of the bushing and connected to the pump base. The gap between the throttling bushing and the bushing forms a channel to be sealed. Along the gas leakage direction, the channel to be sealed is divided into a first sealing section and a second sealing section. The first sealing section is provided with a damping sealing structure for generating reverse damping, and the second sealing section is filled with sealing filler.

[0008] A gland, which is axially movable and sleeved on the bushing, and at least a portion of the gland can extend into the second sealing section;

[0009] An elastic connection structure is provided between the throttling bushing and the gland, and the elastic connection structure is used to push the gland to press the sealing packing.

[0010] In a preferred embodiment of the present invention, the bushing includes a hardened layer disposed along the axial direction of the pump shaft, and the sealing packing fills the space between the hardened layer and the throttling bushing.

[0011] In a preferred embodiment of the present invention, the hardening layer is a weld hardening layer formed on the outer wall of the bushing by a welding process.

[0012] In a preferred embodiment of the present invention, the elastic connection structure includes a plurality of first connecting members spaced apart in a ring, and an elastic member sleeved on each of the first connecting members. The first connecting members pass through the pressure cap and connect to the throttling bushing. The elastic member is used to push the pressure cap to press the sealing packing.

[0013] In a preferred embodiment of the present invention, the gland includes a cover body arranged radially along the pump shaft and a clamping part extending axially from the cover body toward the second sealing section. The clamping part can extend into the second sealing section to clamp the sealing packing. The first connecting member includes a first bolt that passes through the cover body and connects to the throttling bushing. The elastic member includes at least one spring sleeved on the first bolt, and the spring is located between the end of the first bolt and the cover body.

[0014] In a preferred embodiment of the present invention, the sealing packing includes stacked metal packing rings.

[0015] In a preferred embodiment of the present invention, the damping sealing structure includes a spiral groove disposed on the inner wall of the throttling bushing, the spiral groove having a rotation direction opposite to that of the pump shaft; or, the damping sealing structure includes a spiral groove disposed on the outer wall of the bushing, the spiral groove having a rotation direction opposite to that of the pump shaft.

[0016] In a preferred embodiment of the present invention, the inner wall of the throttling bushing is provided with an annular stop portion protruding between the first sealing section and the second sealing section, the annular stop portion being used to limit the sealing packing along the axial direction of the pump shaft.

[0017] In a preferred embodiment of the present invention, the sealing assembly includes a clamping flange detachably fitted onto the pump shaft and a retaining ring detachably fitted onto the shaft sleeve. The clamping flange is detachably connected to the retaining ring for fixing the shaft sleeve onto the pump shaft.

[0018] In a preferred embodiment of this utility model, the clamping flange is provided with a plurality of second connecting members, each of the second connecting members being arranged circumferentially at intervals and capable of penetrating the clamping flange radially to abut against the pump shaft; and / or, the retaining ring is provided with a plurality of third connecting members, each of the third connecting members being arranged circumferentially at intervals and capable of penetrating the retaining ring radially to abut against the bushing; and / or, the clamping flange is provided with a plurality of fourth connecting members, each of the fourth connecting members being arranged circumferentially at intervals and capable of penetrating the clamping flange axially to the pump shaft and connecting to the retaining ring.

[0019] In a preferred embodiment of the present invention, the throttling bushing is provided with an outwardly protruding mounting flange, and the sealing assembly further includes a plurality of fifth connectors, each of which is arranged circumferentially and can pass through the mounting flange along the axial direction of the throttling bushing and connect to the pump base.

[0020] In a preferred embodiment of the present invention, the pump base is provided with a limiting groove, and the bottom of the throttling bushing is inserted into the limiting groove.

[0021] This utility model also provides a vertical molten salt pump, including the aforementioned sealing assembly.

[0022] The technical solution of this utility model has the following significant beneficial effects:

[0023] The sealing assembly of this invention divides the sealing channel between the throttling bushing and the bushing into a first sealing section and a second sealing section, and respectively sets a damping sealing structure and sealing packing, thereby forming a two-stage sealing barrier with active damping pressure reduction and end packing sealing, significantly improving the sealing effect. Specifically, the damping sealing structure in the first sealing section can effectively hinder and significantly reduce the leakage amount and leakage rate of high-temperature gas, thereby significantly reducing the pressure and heat load of the second sealing section. The sealing packing in the second sealing section can form a final barrier to ensure near-zero leakage. At the same time, by setting an elastic connection structure between the throttling bushing and the gland, the elastic connection structure can continuously apply elastic force to the gland, thereby ensuring that the gland always tightly abuts against and presses the sealing packing in the second sealing section. When the sealing packing shrinks in volume due to wear, high-temperature creep, or aging during long-term operation, the elastic force of the elastic connection structure can automatically push the gland to follow up and compensate to maintain the necessary sealing specific pressure of the sealing packing, avoiding the problem of reduced sealing pressure and increased leakage caused by packing wear in existing rigid glands, and greatly extending the maintenance cycle and service life of the sealing assembly. This invention achieves continuous, automatic, and uniform compensation of sealing pressure, solving the problem of easy failure of existing packing seals. It is particularly suitable for high-temperature and high-corrosion working conditions, effectively preventing high-temperature gas leakage, thereby improving the operational reliability of the equipment and ensuring the personal safety of on-site inspectors and operators. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0026] Figure 1 This is a side sectional view of one embodiment of the sealing assembly described in this utility model;

[0027] Figure 2 This is a perspective structural diagram of one embodiment of the sealing assembly described in this utility model;

[0028] Figure 3This is an installation structure diagram of one embodiment of the second and third connectors of this utility model;

[0029] Figure 4 This is a top view of one embodiment of the sealing assembly described in this utility model;

[0030] Figure 5 This is a partially enlarged view of one embodiment of the damping sealing structure described in this utility model.

[0031] The reference numerals in the above figures are as follows:

[0032] 100. Pump base; 110. Mounting hole; 120. Limiting groove;

[0033] 200, Pump shaft; 210, Shaft sleeve; 220, Hardened layer; 230, Compression flange; 240, Retaining ring; 250, Second connecting piece; 260, Third connecting piece; 270, Fourth connecting piece; 280, Limiting shoulder;

[0034] 300. Throttling bushing; 310. Damping sealing structure; 311. Spiral groove; 320. Stop part; 330. Mounting flange; 340. Fifth connecting piece;

[0035] 400. Pressure cap; 410. Cap body; 420. Pressing part;

[0036] 500, elastic connection structure; 510, first connecting member; 520, elastic element;

[0037] 600. Sealing packing. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] Implementation Method 1

[0040] Please refer to the following: Figures 1 to 5As shown, an embodiment of this utility model provides a sealing assembly, which includes a pump base 100 with a mounting hole 110, a pump shaft 200, a throttling bushing 300, a gland 400, and an elastic connection structure 500. The pump shaft 200 is rotatably inserted into the mounting hole 110, and a bushing 210 is provided on the pump shaft 200. The throttling bushing 300 is disposed around the bushing 210 and connected to the pump base 100. The gap between the throttling bushing 300 and the bushing 210 forms a channel to be sealed, which flows along the gas... In the direction of leakage, the channel to be sealed is divided into a first sealing section and a second sealing section. The first sealing section is provided with a damping sealing structure 310 for generating reverse damping, and the second sealing section is filled with sealing filler 600. The gland 400 is axially movable and sleeved on the bushing 210, and at least part of the gland 400 can extend into the second sealing section. The elastic connection structure 500 is disposed between the throttling bushing 300 and the gland 400, and the elastic connection structure 500 is used to push the gland 400 to press the sealing filler 600.

[0041] Overall, the sealing assembly divides the channel to be sealed between the throttling bushing 300 and the bushing 210 into a first sealing section and a second sealing section, and respectively sets a damping sealing structure 310 and a sealing packing 600, thereby forming a two-stage sealing barrier with active damping pressure reduction and end packing plugging, which significantly improves the sealing effect.

[0042] Specifically, the damping sealing structure 310 in the first sealing section effectively hinders and significantly reduces the leakage amount and velocity of high-temperature gas, thereby significantly reducing the pressure and thermal load of the second sealing section. The sealing packing 600 in the second sealing section forms a final barrier, ensuring near-zero leakage.

[0043] Meanwhile, by providing an elastic connection structure 500 between the throttling bushing 300 and the gland 400, the elastic connection structure 500 can continuously apply elastic force to the gland 400, thereby ensuring that the gland 400 always tightly abuts against and presses the sealing packing 600 in the second sealing section.

[0044] When the sealing packing 600 shrinks in volume due to wear, high-temperature creep, or aging during long-term operation, the elastic force of the elastic connection structure 500 can automatically push the gland 400 to follow up and compensate, so as to maintain the necessary sealing specific pressure of the sealing packing 600. This avoids the problem of reduced sealing pressure and increased leakage caused by packing wear in the existing rigid gland 400, and greatly extends the maintenance cycle and service life of the sealing assembly.

[0045] This invention achieves continuous, automatic, and uniform compensation of sealing pressure, solving the problem of easy failure of existing packing seals. It is particularly suitable for high-temperature and high-corrosion working conditions, effectively preventing high-temperature gas leakage, thereby improving the operational reliability of the equipment and ensuring the personal safety of on-site inspectors and operators.

[0046] In the embodiments of this utility model, such as Figure 1 In the embodiment shown, the bushing 210 includes a hardened layer 220 disposed along the axial direction of the pump shaft 200, and a sealing packing 600 is filled between the hardened layer 220 and the throttling bushing 300.

[0047] By providing a hardened layer 220 on the bushing 210, the wear resistance and scratch resistance of the bushing 210 are significantly enhanced, ensuring that the surface of the bushing 210 is not easily worn under long-term operation and continuous compression from automatic packing compensation, thus improving the service life of the bushing 210. Designers can adjust the specific molding method of the hardened layer 220 according to usage requirements, and no specific restrictions are imposed here.

[0048] In one specific embodiment, the hardening layer 220 is a weld hardening layer 220 formed on the outer wall of the bushing 210 by a welding process. By using a welding process to form the hardening layer 220, the hardening layer 220 and the bushing 210 are integrated into one structure, which significantly improves the structural strength and anti-detachment performance of the hardening layer 220.

[0049] In another specific embodiment, the hardened layer 220 can also be an independent metal ring fixed to the outer wall of the bushing 210 by welding or other means. By fixing the metal layer to the bushing 210 to form the hardened layer 220, the specific material of the metal layer can be flexibly adjusted according to the needs of use, thereby better meeting the requirements of different working conditions.

[0050] In the embodiments of this utility model, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 In the embodiment shown, the elastic connection structure 500 includes a plurality of first connectors 510 spaced apart in a ring, and an elastic element 520 sleeved on each of the first connectors 510. The first connectors 510 pass through the gland 400 and are connected to the throttling bushing 300. The elastic element 520 is used to push the gland 400 to press the sealing packing 600.

[0051] By circumferentially arranging the first connector 510 and the elastic member 520, it is possible to ensure that the gland 400 is subjected to a uniform and stable elastic thrust, thereby achieving uniform and stable compression of the sealing packing 600 below, avoiding packing wear or incomplete compression caused by uneven pressure points.

[0052] In one specific embodiment, such as Figure 1 In the embodiment shown, the gland 400 includes a cover 410 arranged radially along the pump shaft 200 and a clamping portion 420 extending axially from the cover 410 toward the second sealing section, the clamping portion 420 being able to extend into the second sealing section to clamp the sealing packing 600.

[0053] The first connector 510 includes a first bolt that passes through the cover 410 and connects to the throttling bushing 300. The elastic element 520 includes at least one spring sleeved on the first bolt, with the spring located between the end of the first bolt and the cover 410.

[0054] Designers can adjust the specific type and number of springs according to the clamping requirements; no specific limitations are imposed here. Preferably, multiple springs are arranged to form a spring assembly. The spring assembly allows for flexible adjustment of the elastic force, thereby ensuring stable clamping of the sealing packing 600.

[0055] In embodiments of this utility model, designers can adjust the specific type and material of the sealing packing 600 according to usage needs, and no specific limitations are imposed here. Preferably, the sealing packing 600 includes stacked metal packing rings. More preferably, the metal packing rings are copper packing rings.

[0056] Specifically, copper wires are braided to form a compression-resistant copper packing ring, resulting in a compact structure with good ductility, easy installation, and good wear resistance. The copper packing ring effectively blocks high-temperature gas leakage through the damping sealing structure 310. Its good ductility also facilitates integration with the elastic connection structure 500, ensuring a tight seal and extending the maintenance cycle.

[0057] In the embodiments of this utility model, such as Figure 1 , Figure 2 and Figure 5 In the embodiment shown, the damping seal structure 310 includes a spiral groove 311 disposed on the inner wall of the throttling bushing 300, the spiral groove 311 having a rotation direction opposite to that of the pump shaft 200; or, the damping seal structure 310 includes a spiral groove 311 disposed on the outer wall of the bushing 210, the spiral groove 311 having a rotation direction opposite to that of the pump shaft 200.

[0058] In one specific embodiment, such as Figure 1 and Figure 5 In the embodiment shown, the damping seal structure 310 includes a spiral groove 311 disposed on the inner wall of the throttling bushing 300, the spiral groove 311 being opposite to the rotation direction of the pump shaft 200.

[0059] In another specific embodiment, the damping sealing structure 310 includes a spiral groove 311 disposed on the outer wall of the bushing 210, the spiral groove 311 being opposite to the rotation direction of the pump shaft 200.

[0060] By providing a spiral groove 311 on the inner wall of the throttling bushing 300 or the outer wall of the bushing 210 with a rotation direction opposite to that of the pump shaft 200, when the pump shaft 200 rotates, the spiral groove 311 generates a strong reverse pumping effect on the high-temperature gas in the first sealing section, actively establishing damping to resist leakage, significantly reducing the pressure and flow rate of the leaking gas, and creating a more gentle sealing condition for the downstream packing seal. Designers can adjust the specific setting parameters of the spiral groove 311 according to the usage requirements, and no specific restrictions are imposed here.

[0061] In the embodiments of this utility model, such as Figure 1 and Figure 2 In the embodiment shown, the inner wall of the throttling bushing 300 is provided with an annular stop portion 320 located between the first sealing section and the second sealing section. The annular stop portion 320 is used to limit the sealing packing 600 along the axial direction of the pump shaft 200.

[0062] By setting an annular stop 320 between the first sealing section and the second sealing section, the annular stop 320 provides a reliable positioning reference and support surface for the sealing packing 600 in the axial direction. This effectively prevents the sealing packing 600 from being over-compressed and displaced during the pressing and operation process, ensuring clear two-stage sealing function and stable position. It also simplifies the installation and replacement process of the packing and improves the convenience and accuracy of assembly.

[0063] In the embodiments of this utility model, such as Figure 1 , Figure 2 and Figure 3 In the embodiment shown, the sealing assembly includes a clamping flange 230 detachably fitted onto the pump shaft 200 and a retaining ring 240 detachably fitted onto the bushing 210. The clamping flange 230 is detachably connected to the retaining ring 240 for fixing the bushing 210 onto the pump shaft 200.

[0064] By setting a detachable clamping flange 230 and retaining ring 240, the clamping flange 230 and retaining ring 240 can cooperate to fix the bushing 210, which makes it easy to replace or repair the bushing 210 without disassembling the entire pump shaft 200, greatly improving the maintainability of the equipment and ensuring the connection strength and concentricity between the bushing 210 and the pump shaft 200.

[0065] In an embodiment of this utility model, a plurality of second connecting members 250 are provided on the clamping flange 230, each second connecting member 250 is arranged circumferentially and can penetrate the clamping flange 230 radially to abut against the pump shaft 200; and / or, a plurality of third connecting members 260 are provided on the retaining ring 240, each third connecting member 260 is arranged circumferentially and can penetrate the retaining ring 240 radially to abut against the bushing 210; and / or, a plurality of fourth connecting members 270 are provided on the clamping flange 230, each fourth connecting member 270 is arranged circumferentially and can penetrate the clamping flange 230 axially along the pump shaft 200 and connect to the retaining ring 240.

[0066] Preferred, such as Figure 2 , Figure 3 and Figure 4 In the embodiment shown, the clamping flange 230 is provided with a plurality of second connectors 250, each second connector 250 being arranged circumferentially and capable of penetrating the clamping flange 230 radially to abut against the pump shaft 200; and the retaining ring 240 is provided with a plurality of third connectors 260, each third connector 260 being arranged circumferentially and capable of penetrating the retaining ring 240 radially to abut against the bushing 210; and the clamping flange 230 is provided with a plurality of fourth connectors 270, each fourth connector 270 being arranged circumferentially and capable of penetrating the clamping flange 230 axially to connect to the retaining ring 240.

[0067] Designers can adjust the specific types of the second connector 250, the third connector 260, and the fourth connector 270 according to usage requirements, and no specific limitations are imposed here. In one specific embodiment, the second connector 250, the third connector 260, and the fourth connector 270 are all configured as bolts.

[0068] By providing a radial second connector 250 on the clamping flange 230 to abut against the pump shaft 200, and a radial third connector 260 on the retaining ring 240 to abut against the bushing 210, the bushing 210 can be stably fixed. This avoids interference fit stress problems caused by different coefficients of thermal expansion at high temperatures, and provides sufficient fastening force to prevent the bushing 210 from loosening or rotating circumferentially during operation, thus ensuring the stability of the sealing surface.

[0069] Furthermore, a limiting shoulder 280 is provided on the pump shaft 200, which is used to limit the bottom of the bushing 210 along the axial direction. The structural stability of the bushing 210 is improved by the cooperation of the limiting shoulder 280 with the clamping flange 230 and the retaining ring 240.

[0070] In the embodiments of this utility model, such as Figure 2In the embodiment shown, the throttling bushing 300 is provided with an outwardly protruding mounting flange 330, and the sealing assembly also includes a plurality of fifth connectors 340, each of which is arranged circumferentially and can pass through the mounting flange 330 along the axial direction of the throttling bushing 300 and connect to the pump seat 100.

[0071] Designers may adjust the specific types of the second connector 250 and the third connector 260 according to usage requirements, and no specific limitations are imposed here. In one specific embodiment, the fifth connector 340 is a screw.

[0072] By setting a mounting flange 330 on the throttling bushing 300 and connecting it to the pump base 100 through multiple axially penetrating fifth connectors 340, the throttling bushing 300 is securely installed and precisely aligned. This also facilitates quick disassembly and replacement of the throttling bushing 300 in case of damage.

[0073] In this embodiment of the invention, a limiting groove 120 is provided on the pump base 100, and the bottom of the throttling bushing 300 is inserted into the limiting groove 120. By providing the limiting groove 120 on the pump base 100 and inserting the bottom of the throttling bushing 300 into it, the throttling bushing 300 is precisely positioned, effectively limiting the radial micro-movement that may occur during operation, ensuring that the gap between it and the bushing 210 is uniform and stable, thereby ensuring the effect of damping seal and packing seal.

[0074] Implementation Method 2

[0075] This invention provides a vertical molten salt pump, which includes a sealing assembly as described in Embodiment 1. The specific structure and beneficial effects of this sealing assembly are the same as those described in Embodiment 1, and will not be repeated here.

[0076] This vertical molten salt pump effectively solves the long-standing problem of high-temperature gas leakage along the pump shaft 200 in high-temperature molten salt pumps by setting a sealing component. It greatly improves the reliability, safety and environmental friendliness of the pump in high-temperature and highly corrosive molten salt media, reduces the risk of unplanned downtime and media leakage loss due to seal failure, and extends the equipment maintenance cycle. It has outstanding economic benefits and application value.

[0077] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0078] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A sealing assembly, characterized in that, include: Pump base with mounting holes; A pump shaft, which is rotatably inserted into the mounting hole, and a bushing is provided on the pump shaft; A throttling bushing is disposed on the periphery of the bushing and connected to the pump base. The gap between the throttling bushing and the bushing forms a channel to be sealed. Along the gas leakage direction, the channel to be sealed is divided into a first sealing section and a second sealing section. The first sealing section is provided with a damping sealing structure for generating reverse damping, and the second sealing section is filled with sealing filler. A gland, which is axially movable and sleeved on the bushing, and at least a portion of the gland can extend into the second sealing section; An elastic connection structure is provided between the throttling bushing and the gland, and the elastic connection structure is used to push the gland to press the sealing packing.

2. The sealing assembly as claimed in claim 1, characterized in that, The bushing includes a hardened layer disposed along the axial direction of the pump shaft, and the sealing packing fills the space between the hardened layer and the throttling bushing.

3. The sealing assembly as claimed in claim 2, characterized in that, The hardened layer is a weld hardened layer formed on the outer wall of the bushing through a welding process.

4. The sealing assembly as claimed in claim 1, characterized in that, The elastic connection structure includes a plurality of first connectors spaced apart in a ring, and an elastic element sleeved on each of the first connectors. The first connectors pass through the gland and are connected to the throttling bushing. The elastic element is used to push the gland to press the sealing packing.

5. The sealing assembly as claimed in claim 4, characterized in that, The gland includes a cover body arranged radially along the pump shaft and a clamping portion extending axially from the cover body toward the second sealing section. The clamping portion can extend into the second sealing section to clamp the sealing packing. The first connecting member includes a first bolt that passes through the cover body and connects to the throttling bushing. The elastic member includes at least one spring sleeved on the first bolt, the spring being located between the end of the first bolt and the cover body.

6. The sealing assembly as claimed in claim 1, characterized in that, The sealing packing includes stacked metal packing rings.

7. The sealing assembly as claimed in claim 1, characterized in that, The damping sealing structure includes a spiral groove disposed on the inner wall of the throttling bushing, the spiral groove rotating in the opposite direction to the rotation direction of the pump shaft; or, the damping sealing structure includes a spiral groove disposed on the outer wall of the bushing, the spiral groove rotating in the opposite direction to the rotation direction of the pump shaft.

8. The sealing assembly as claimed in claim 1, characterized in that, The inner wall of the throttling bushing has an annular stop portion protruding between the first sealing section and the second sealing section. The annular stop portion is used to limit the sealing packing along the axial direction of the pump shaft.

9. The sealing assembly as claimed in claim 1, characterized in that, The sealing assembly includes a clamping flange detachably fitted onto the pump shaft and a retaining ring detachably fitted onto the shaft sleeve. The clamping flange is detachably connected to the retaining ring for fixing the shaft sleeve onto the pump shaft.

10. The sealing assembly as claimed in claim 9, characterized in that, The clamping flange is provided with a plurality of second connecting members, each of which is arranged circumferentially and can penetrate the clamping flange radially to abut against the pump shaft; and / or, the retaining ring is provided with a plurality of third connecting members, each of which is arranged circumferentially and can penetrate the retaining ring radially to abut against the bushing; and / or, the clamping flange is provided with a plurality of fourth connecting members, each of which is arranged circumferentially and can penetrate the clamping flange axially to abut against the retaining ring.

11. The sealing assembly as claimed in claim 1, characterized in that, The throttling bushing is provided with an outwardly protruding mounting flange, and the sealing assembly also includes a plurality of fifth connectors, each of which is arranged circumferentially and can pass through the mounting flange along the axial direction of the throttling bushing and connect to the pump base.

12. The sealing assembly as claimed in claim 1, characterized in that, The pump base is provided with a limiting groove, and the bottom of the throttling bushing is inserted into the limiting groove.

13. A vertical molten salt pump, characterized in that, Includes the sealing assembly as described in any one of claims 1 to 12.

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