Sealing assembly and feed pump

Abstract

The utility model provides a kind of sealing assembly and feed pump, the sealing assembly includes pump shell, suction section, first stage middle section and stress guiding structure, pump shell includes inner axial locating surface;Suction section is equipped with inner sealing element between inner axial locating surface, and first radial end face is equipped on suction section;First stage middle section is abutted on suction section axially and is radially limited with suction section, and second radial end face is equipped on first stage middle section and faces suction section;Stress guiding structure is arranged between suction section and first stage middle section, and stress guiding structure is used to limit the stress area between first radial end face and second radial end face to make axial force on first stage middle section pass to suction section along stress area, and the axial projection area of stress area is less than the coincident area of first radial end face and second radial end face axial projection.The utility model can change stress transmission path to reduce or eliminate the overturning moment generated by first stage middle section to suction section, to guarantee that inner sealing is long-term reliable.

Description

Technical Field

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

[0002] In thermal power generation, nuclear energy, and chemical industries, high-temperature and high-pressure feedwater pumps are the core power equipment of the system, and their operational reliability directly affects the safety and efficiency of the entire system. The pump casing typically houses components such as the suction section, primary stage intermediate section, and secondary stage intermediate section. The suction section and primary stage intermediate section are generally axially fastened using connecting bolts. The pump casing has axially arranged outer and inner axial positioning surfaces. The inner end of the suction section relies on assembly precision to press the inner seal against the inner axial positioning surface to achieve a sealing effect. Currently, the inner end of the suction section and the inner axial positioning surface use a fully fitted contact surface, and the suction section and the primary stage intermediate section, as well as the primary stage intermediate section and the secondary stage intermediate section, also use fully fitted contact surfaces. When a feedwater pump is operating to transport high-temperature, high-pressure media, a significant axial force is generated inside the pump chamber. This axial force is directly and rigidly transmitted from the secondary stage to the primary stage via the contact surface, and then from the primary stage to the suction stage. This transmission of axial force bypasses the connecting bolts, thus applying an overturning moment to the suction stage. This creates an uneven load at the contact surface between the suction stage and the inner axial positioning surface, resulting in uneven stress between them. Consequently, the suction stage cannot evenly compress the inner seal, easily leading to internal seal failure and subsequent leakage of the pump's internal media. Therefore, how to change the force transmission path to reduce or eliminate the overturning moment generated by the primary stage on the suction stage, thereby ensuring the long-term reliability of the internal seal, 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 water pump, which are used to change the force transmission path to reduce or eliminate the overturning moment generated by the first stage middle section on the suction section, thereby ensuring the long-term reliability of the internal seal.

[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: Pump housing, the pump housing including an inner axial positioning surface; The suction section is detachably connected to the pump housing. An inner seal is provided between the suction section and the inner axial positioning surface. The suction section can be used to press the inner seal onto the inner axial positioning surface. The suction section is provided with a first radial end face facing away from the inner axial positioning surface. The first stage middle section is detachably connected to the suction section. The first stage middle section axially abuts against the suction section and is radially limited by the suction section. The first stage middle section is provided with a second radial end face facing the suction section. A force-guiding structure is disposed between the intake section and the first stage middle section. The force-guiding structure is used to define a force-bearing area between the first radial end face and the second radial end face so that the axial force on the first stage middle section is transmitted to the intake section along the force-bearing area. The axial projection area of ​​the force-bearing area is smaller than the overlapping area of ​​the axial projections of the first radial end face and the second radial end face.

[0005] In a preferred embodiment of the present invention, the force-guiding structure includes a first protrusion disposed on the first radial end face and / or a second protrusion disposed on the second radial end face. The suction section and the first stage middle section abut against each other through the first protrusion and / or the second protrusion. The abutting surfaces of the first protrusion and / or the second protrusion constitute the force-bearing area.

[0006] In a preferred embodiment of the present invention, the suction section includes a first groove structure disposed on the first radial end face, at least a portion of the suction section being convex through the first groove structure to form the first protrusion, and the first radial end face without the first groove structure constituting the abutment surface of the first protrusion; and / or, the first stage middle section includes a second groove structure disposed on the second radial end face, at least a portion of the first stage middle section being convex through the second groove structure to form the second protrusion, and the second radial end face without the second groove structure constituting the abutment surface of the second protrusion.

[0007] In a preferred embodiment of the present invention, the sealing assembly further includes a plurality of connectors, which are spaced apart and detachably connected to the suction section and the first stage middle section, and the connectors are located within the axial projection of the stress area.

[0008] In a preferred embodiment of the present invention, the connector includes a connecting bolt, the suction section is provided with a first mounting hole, the first stage middle section is provided with a second mounting hole, and the connecting bolt can pass through the first mounting hole and be threadedly connected to the second mounting hole.

[0009] In a preferred embodiment of the present invention, the sealing assembly further includes a secondary intermediate section, which is detachably connected to the primary intermediate section. The secondary intermediate section axially abuts against the primary intermediate section and is radially limited by the suction section.

[0010] In a preferred embodiment of the present invention, the first-stage middle section is provided with a third radial end face facing the second-stage middle section, and the second-stage middle section is provided with a fourth radial end face facing the first-stage middle section, wherein the third radial end face and the fourth radial end face abut against each other.

[0011] In a preferred embodiment of this utility model, a third mounting hole is provided on the secondary middle section, and the connecting bolt can pass through the first mounting hole and the second mounting hole and be threaded into the third mounting hole.

[0012] In a preferred embodiment of the present invention, the suction section further includes a first axial end face that is connected to the first radial end face. The first axial end face is slidably abutted against the inner wall of the pump housing. A clearance groove is provided between the first axial end face and the first radial end face. The clearance groove is used to prevent the connection between the first axial end face and the first radial end face from being over-constrained at the inner axial positioning surface.

[0013] This utility model also provides a water pump, including the aforementioned sealing assembly.

[0014] The technical solution of this utility model has the following significant beneficial effects: The sealing assembly of this invention defines a force-bearing area between the suction section and the first-stage intermediate section by setting a force-guiding structure between them. The axial projection area of ​​this force-bearing area is smaller than the overlapping area of ​​the axial projections between their radial end faces, thereby changing the transmission path of the axial force. The axial force, which was originally dispersed on the first and second radial end faces and was prone to overturning moments at the edges of the radial end faces, is concentrated and guided to the force-bearing area for transmission. Because the area of ​​the force-bearing area is reduced and its position is controllable (for example, the force-bearing area can be set in the middle region between the first and second radial end faces), the non-force-bearing area no longer transmits torque, thus reducing or eliminating the off-center load between the suction section and the first-stage intermediate section. This reduces the overturning moment exerted by the first-stage intermediate section on the suction section, resulting in uniform pressure on the inner seal, ensuring long-term reliable internal sealing, reducing the risk of medium leakage in the pump due to internal seal failure under high temperature and high pressure conditions, and improving the stability and reliability of the pump operation. Attached Figure Description

[0015] 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.

[0016] 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.

[0017] Figure 1 This is a side sectional view of one embodiment of the sealing assembly described in this utility model; Figure 2 This is a side sectional view of one embodiment of the force-guiding structure described in this utility model; Figure 3 This is a schematic diagram showing the docking of the inhalation section, the first stage mid-section, and the second stage mid-section described in this utility model; Figure 4 This is a schematic diagram illustrating the force guidance of the sealing assembly described in this utility model; Figure 5 This is a side sectional view of another embodiment of the force-guiding structure described in this utility model.

[0018] The reference numerals in the above figures are as follows: 10. Internal sealing element; 20. Stress-bearing area; 100. Pump casing; 110. Inner axial positioning surface; 200, Suction section; 210, First radial end face; 220, First axial end face; 230, Clearance groove; 240, First mounting hole; 300, First stage middle section; 310, Second radial end face; 320, Third radial end face; 330, Second mounting hole; 400, Force-guiding structure; 410, First protrusion; 420, First groove structure; 430, Second protrusion; 440, Second groove structure; 500, Secondary intermediate section; 510, Fourth radial end face; 520, Third mounting hole; 600. Connectors. Detailed Implementation

[0019] 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.

[0020] Implementation Method 1

[0021] Please refer to the following: Figures 1 to 5 As shown, an embodiment of this utility model provides a sealing assembly, which includes a pump housing 100, a suction section 200, a first-stage intermediate section 300, and a force-guiding structure 400. The pump housing 100 includes an inner axial positioning surface 110; the suction section 200 is detachably connected to the pump housing 100, and an inner sealing element 10 is provided between the suction section 200 and the inner axial positioning surface 110. The suction section 200 can be used to press the inner sealing element 10 onto the inner axial positioning surface 110, and the suction section 200 has a first radial end face 210 facing away from the inner axial positioning surface 110; the first-stage intermediate section 300 is detachably connected to the suction section 200, and the first-stage intermediate section 300... The first stage mid-section 300 axially abuts against the suction section 200 and is radially limited by the suction section 200. The first stage mid-section 300 is provided with a second radial end face 310 facing the suction section 200. The force guiding structure 400 is disposed between the suction section 200 and the first stage mid-section 300. The force guiding structure 400 is used to define a force-bearing region 20 between the first radial end face 210 and the second radial end face 310 so that the axial force on the first stage mid-section 300 is transmitted to the suction section 200 along the force-bearing region 20. The axial projection area of ​​the force-bearing region 20 is smaller than the overlapping area of ​​the axial projection of the first radial end face 210 and the second radial end face 310.

[0022] Overall, such as Figure 1 and Figure 4 In the embodiment shown, the sealing assembly defines a force-bearing region 20 between the suction section 200 and the first-stage middle section 300 by providing a force-guiding structure 400 between the suction section 200 and the first-stage middle section 300. The axial projection area of ​​the force-bearing region 20 is smaller than the overlapping area of ​​the axial projections between the radial end faces of the two sections, thereby changing the transmission path of the axial force. The axial force that was originally dispersed on the first radial end face 210 and the second radial end face 310 and was prone to overturning moment at the edge of the radial end face is concentrated and guided to the force-bearing region 20 for transmission.

[0023] Because the area of ​​the stress-bearing region 20 is reduced and its position is controllable, for example, the stress-bearing region 20 can be set in the middle region between the first radial end face 210 and the second radial end face 310, so that the non-stress-bearing region no longer transmits torque, thereby reducing or eliminating the off-center load between the suction section 200 and the first stage middle section 300, and thus reducing the overturning moment of the first stage middle section 300 on the suction section 200, so that the inner seal 10 is under uniform pressure, ensuring the long-term reliability of the inner seal, reducing the risk of medium leakage in the pump due to the failure of the inner seal under high temperature and high pressure conditions, and improving the stability and reliability of the pump equipment operation.

[0024] In the embodiments of this utility model, the designer may adjust the specific structure of the inhalation section 200 and the first-stage middle section 300 according to the needs of use, and no specific limitations are made here.

[0025] In one feasible embodiment, such as Figure 3 In the embodiment shown, the suction section 200 is provided with a first guide groove on the side facing the first stage middle section 300. The bottom of the first guide groove forms a first radial end face 210. The first stage middle section 300 can be axially slidably inserted into the first guide groove, and the inner side of the first stage middle section 300 can be radially abutted against the side wall of the first guide groove.

[0026] In the embodiments of this utility model, such as Figure 2 and Figure 5 In the embodiment shown, the force-guiding structure 400 includes a first protrusion 410 disposed on a first radial end face 210 and / or a second protrusion 430 disposed on a second radial end face 310. The suction section 200 and the first-stage middle section 300 abut against each other through the first protrusion 410 and / or the second protrusion 430. The abutting surfaces of the first protrusion 410 and / or the second protrusion 430 constitute the force-bearing region 20.

[0027] In one feasible embodiment, such as Figure 2 and Figure 3 In the embodiment shown, the force-guiding structure 400 includes a first protrusion 410 disposed on a first radial end face 210. The suction section 200 and the first stage middle section 300 abut against each other through the first protrusion 410, and the abutment surface of the first protrusion 410 constitutes the force-bearing region 20.

[0028] In another feasible embodiment, the force-guiding structure 400 includes a second protrusion 430 disposed on the second radial end face 310, the suction section 200 and the first stage middle section 300 abut against each other through the second protrusion 430, and the abutment surface of the second protrusion 430 constitutes the force-bearing area 20.

[0029] In another feasible embodiment, the force-guiding structure 400 includes a first protrusion 410 disposed on a first radial end face 210 and a second protrusion 430 disposed on a second radial end face 310. The suction section 200 and the first stage middle section 300 abut against each other through the first protrusion 410 and the second protrusion 430. The abutment surface between the first protrusion 410 and the second protrusion 430 constitutes the force-bearing region 20.

[0030] By setting the first protrusion 410 and / or the second protrusion 430, it is possible to directly bear and transmit huge axial loads, and the non-protrusion area forms a non-contact clearance fit, which completely blocks the transmission path of overturning moment in the non-stressed area.

[0031] In the embodiments of this utility model, the designer may adjust the specific arrangement of the first protrusion 410 according to the needs of use, and no specific restrictions are imposed here.

[0032] In one feasible embodiment, such as Figure 2 and Figure 3 In the embodiment shown, the first protrusion 410 is integrally formed with the suction section 200 and protrudes directly onto the first radial limiting end face.

[0033] In another feasible embodiment, the first protrusion 410 and the suction section 200 are separately arranged, and the first protrusion 410 is fixed to the first radial limiting end face by welding.

[0034] In another feasible embodiment, such as Figure 2 and Figure 3 In the embodiment shown, the suction section 200 includes a first groove structure 420 disposed on a first radial end face 210. At least a portion of the suction section 200 is provided in a raised manner through the first groove structure 420 to form a first protrusion 410. The first radial end face 210 without the first groove structure 420 constitutes the abutment surface of the first protrusion 410.

[0035] The first protrusion 410 is formed by machining the first groove structure 420 on the first radial end face 210, which realizes subtractive processing. The first protrusion 410 can be formed without adding additional parts, thereby reducing manufacturing steps and costs.

[0036] Specifically, the first groove structure 420 is arranged in a ring shape, thereby forming a ring-shaped first protrusion 410 on the first radial end face 210. Furthermore, two first groove structures 420 may be provided and respectively placed on both sides of the first protrusion 410.

[0037] In the embodiments of this utility model, the designer may adjust the specific arrangement of the second protrusion 430 according to the needs of use, and no specific restrictions are imposed here.

[0038] In one feasible embodiment, the second protrusion 430 is integrally formed with the suction section 200 and protrudes directly onto the second radial limiting end face.

[0039] In another feasible embodiment, the second protrusion 430 and the suction section 200 are separately arranged, and the second protrusion 430 is fixed to the second radial limiting end face by welding.

[0040] In another feasible embodiment, such as Figure 5 In the embodiment shown, the first-stage middle section 300 includes a second groove structure 440 disposed on the second radial end face 310. At least a portion of the first-stage middle section 300 is provided in a raised manner through the second groove structure 440 to form a second protrusion 430. The second radial end face 310 without the second groove structure 440 constitutes the abutment surface of the second protrusion 430.

[0041] The second protrusion 430 is formed by machining the second groove structure 440 on the second radial end face 310, which realizes subtractive processing. The second protrusion 430 can be formed without adding additional parts, thereby reducing manufacturing steps and costs.

[0042] Specifically, the second groove structure 440 is arranged in a ring shape, thereby forming a ring-shaped second protrusion 430 on the second radial end face 310. Furthermore, two second groove structures 440 may be provided and respectively positioned on both sides of the second protrusion 430. The structure of the second protrusion 430 can be referenced to the first protrusion 410, and is not shown here.

[0043] When using subtractive manufacturing, the force-guiding structure 400 in this invention can be directly achieved by machining the end face of existing pump components, without significantly increasing the number of parts or changing the overall installation dimensions of the pump body. This structure is suitable for both the design and manufacture of new pumps and the upgrading and renovation of existing older water pump models, possessing extremely high engineering application value and economic benefits.

[0044] When additive manufacturing is used, the force-guiding structure 400 in this utility model can be directly fixed by welding on the end face of the existing pump component. This structure is suitable for the design and manufacture of new pumps and is also very suitable for the upgrading and transformation of existing old-model water pumps. It has extremely high engineering application value and economic benefits.

[0045] In the embodiments of this utility model, such as Figure 1 and Figure 2 In the embodiment shown, the sealing assembly also includes a plurality of connectors 600, which are spaced apart and detachably connected to the suction section 200 and the first-stage middle section 300. The connectors 600 are located within the axial projection of the stress region 20.

[0046] The suction section 200 and the first-stage intermediate section 300 can be detachably connected by multiple connectors 600, improving the connection strength. Furthermore, by placing the multiple connectors 600 within the stress-bearing area 20, the connection preload and axial force of the connectors 600 can be transmitted through the shared stress-bearing area 20. This helps reduce the additional bending moment generated by the preload of the connectors 600, lowering the initial stress of the suction section 200 and the first-stage intermediate section 300 in the assembled state, ensuring assembly accuracy and operational stability.

[0047] Designers can adjust the specific type of connector 600 according to usage requirements, and no specific limitations are imposed here. In one feasible embodiment, such as Figure 1 and Figure 2In the embodiment shown, the connector 600 includes a connecting bolt, the suction section 200 is provided with a first mounting hole 240, the first stage middle section 300 is provided with a second mounting hole 330, and the connecting bolt can pass through the first mounting hole 240 and be threaded into the second mounting hole 330.

[0048] When the suction section 200 and the first stage middle section 300 are connected to each other by connecting bolts, the second mounting hole 330 is set as a screw hole, and the first mounting hole 240 can be either a screw hole or a through hole, without specific restrictions.

[0049] By employing a detachable connection method where connecting bolts pass through the suction section 200 and are threadedly connected to the first-stage intermediate section 300, a reliable connection between the suction section 200 and the first-stage intermediate section 300 is achieved. Furthermore, since the connecting bolts are located within the stress zone 20, their primary function becomes providing preload to maintain end-face contact, rather than bearing overturning moments. This reduces the risk of fatigue fracture of the connecting bolts and extends their service life.

[0050] In the embodiments of this utility model, such as Figure 1 and Figure 2 In the embodiment shown, the sealing assembly further includes a secondary intermediate section 500, which is detachably connected to the primary intermediate section 300. The secondary intermediate section 500 axially abuts against the primary intermediate section 300 and is radially limited by the suction section 200.

[0051] By setting a secondary intermediate section 500 that axially abuts against and radially limits the primary intermediate section 300, a stable multi-stage internal stacking structure is constructed, enabling the pump body to adapt to higher head requirements.

[0052] Specifically, such as Figure 3 In the embodiment shown, the first-stage middle section 300 is provided with a third radial end face 320 facing the second-stage middle section 500, and the second-stage middle section 500 is provided with a fourth radial end face 510 facing the first-stage middle section 300. The third radial end face 320 and the fourth radial end face 510 abut against each other.

[0053] By abutting and engaging the third radial end face 320 with the fourth radial end face 510, the two are in surface contact, which ensures the docking stability of the first-stage middle section 300 and the second-stage middle section 500. Furthermore, the surface contact method can directly bear and transmit huge axial loads, thus creating a reliable axial force transmission path between the first-stage middle section 300 and the second-stage middle section 500.

[0054] Designers can adjust the specific structure of the primary section 300 and the secondary section 500 according to usage needs, and no specific restrictions are imposed here. In one feasible embodiment, the primary section 300 is provided with a second guide groove on the side facing the secondary section 500, the secondary section 500 can be axially slidably inserted into the second guide groove, and the inner side of the primary section can be radially abutted against the side wall of the second guide groove.

[0055] In the embodiments of this utility model, such as Figure 2 and Figure 3 In the embodiment shown, the secondary middle section 500 is provided with a third mounting hole 520, and the connecting bolt can pass through the first mounting hole 240 and the second mounting hole 330 and be threaded into the third mounting hole 520.

[0056] When the suction section 200, the first intermediate section 300 and the second intermediate section 500 are connected by connecting bolts, the third mounting hole 520 is set as a screw hole, and the first mounting hole 240 and the second mounting hole 330 can be either screw holes or through holes, without specific restrictions.

[0057] By providing a third mounting hole 520 on the secondary intermediate section 500, connecting bolts are sequentially passed through the suction section 200 and the primary intermediate section 300, and then locked in the secondary intermediate section 500, thus connecting the three sections into a single unit and ensuring uniform force distribution among them. Furthermore, using connecting bolts reduces assembly difficulty and helps improve disassembly and assembly efficiency.

[0058] In the embodiments of this utility model, such as Figure 1 and Figure 2 In the embodiment shown, the suction section 200 further includes a first axial end face 220 that is connected to the first radial end face 210. The first axial end face 220 is slidably abutted against the inner wall of the pump housing 100. A clearance groove 230 is provided between the first axial end face 220 and the first radial end face 210. The clearance groove 230 is used to prevent the connection between the first axial end face 220 and the first radial end face 210 from being over-constrained at the inner axial positioning surface 110.

[0059] By providing a clearance groove 230 between the first axial end face 220 and the first radial end face 210 of the suction section 200, the rigid constraint of the inner wall of the pump casing 100 on the suction section 200 is effectively cut off, preventing the suction section 200 from getting stuck or over-constrained with the pump casing 100 due to thermal expansion or manufacturing errors. This improves the assembly accuracy and allows the suction section 200 to press the inner seal 10 more evenly.

[0060] Implementation Method 2

[0061] An embodiment of this utility model provides a water supply pump, which includes a sealing assembly as described in Embodiment 1. The specific structure and beneficial effects of the sealing assembly are the same as those described in Embodiment 1, and will not be repeated here.

[0062] 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.

[0063] 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 housing, the pump housing including an inner axial positioning surface; The suction section is detachably connected to the pump housing. An inner seal is provided between the suction section and the inner axial positioning surface. The suction section can be used to press the inner seal onto the inner axial positioning surface. The suction section is provided with a first radial end face facing away from the inner axial positioning surface. The first stage middle section is detachably connected to the suction section. The first stage middle section axially abuts against the suction section and is radially limited by the suction section. The first stage middle section is provided with a second radial end face facing the suction section. A force-guiding structure is disposed between the intake section and the first stage middle section. The force-guiding structure is used to define a force-bearing area between the first radial end face and the second radial end face so that the axial force on the first stage middle section is transmitted to the intake section along the force-bearing area. The axial projection area of ​​the force-bearing area is smaller than the overlapping area of ​​the axial projections of the first radial end face and the second radial end face.

2. The sealing assembly as claimed in claim 1, characterized in that, The force-guiding structure includes a first protrusion disposed on the first radial end face and / or a second protrusion disposed on the second radial end face. The suction section and the first stage middle section abut against each other through the first protrusion and / or the second protrusion. The abutting surfaces of the first protrusion and / or the second protrusion constitute the force-bearing area.

3. The sealing assembly as claimed in claim 2, characterized in that, The suction section includes a first groove structure disposed on the first radial end face, at least a portion of the suction section being convex through the first groove structure to form the first protrusion, and the first radial end face without the first groove structure constituting the abutment surface of the first protrusion; and / or, the first-stage middle section includes a second groove structure disposed on the second radial end face, at least a portion of the first-stage middle section being convex through the second groove structure to form the second protrusion, and the second radial end face without the second groove structure constituting the abutment surface of the second protrusion.

4. The sealing assembly as claimed in claim 1, characterized in that, The sealing assembly also includes a plurality of connectors, which are spaced apart and detachably connected to the intake section and the first stage middle section. The connectors are located within the axial projection of the stress area.

5. The sealing assembly as claimed in claim 4, characterized in that, The connector includes a connecting bolt, the suction section has a first mounting hole, the first stage middle section has a second mounting hole, and the connecting bolt can pass through the first mounting hole and be threaded into the second mounting hole.

6. The sealing assembly as claimed in claim 5, characterized in that, The sealing assembly further includes a secondary intermediate section, which is detachably connected to the primary intermediate section. The secondary intermediate section axially abuts against the primary intermediate section and is radially limited by the suction section.

7. The sealing assembly as claimed in claim 6, characterized in that, The first-stage middle section is provided with a third radial end face facing the second-stage middle section, and the second-stage middle section is provided with a fourth radial end face facing the first-stage middle section. The third radial end face and the fourth radial end face abut against each other.

8. The sealing assembly as claimed in claim 6, characterized in that, The secondary middle section is provided with a third mounting hole, and the connecting bolt can pass through the first mounting hole and the second mounting hole and be threaded into the third mounting hole.

9. The sealing assembly as claimed in claim 1, characterized in that, The suction section also includes a first axial end face that is connected to the first radial end face. The first axial end face is slidably abutted against the inner wall of the pump casing. A clearance groove is provided between the first axial end face and the first radial end face. The clearance groove is used to prevent the connection between the first axial end face and the first radial end face from being over-constrained at the inner axial positioning surface.

10. A water pump, characterized in that, Includes the sealing assembly as described in any one of claims 1 to 9.

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