Bearing and shielding tank integrated structure and circulating pump

Abstract

The invention relates to a bearing and shielding tank integrated structure and a circulating pump, the bearing and shielding tank integrated structure is installed in the circulating pump, the circulating pump is provided with a cooling flow channel, the integrated structure comprises a shielding tank and a rear bearing assembly, and the rear bearing assembly comprises a rear bearing and a bearing accessory. The bearing fitting is mounted between the rear bearing and the end surface in the shielding tank; a clearance space is formed between the end surface of the central shaft of the circulating pump and the bearing fitting and / or the end surface in the shielding tank; the clearance space is communicated with an axis hole in the center shaft to form a fluid channel, and the fluid channel is a part of the cooling flow channel. Compared with the prior art, the rear bearing assembly can support and mount a rear bearing, and a clearance space is formed in the shielding tank and serves as a part of a cooling liquid channel, so that circulation of cooling liquid is achieved; and the clearance space provides a temporary storage and transition cavity for the cooling liquid and also provides an avoiding space for the rotation of the central shaft, so that no interference in operation is ensured, and the like.

Description

Technical Field

[0001] This invention relates to circulating pumps, and more particularly to a structure integrating a bearing and a shielding tank, and a circulating pump thereof. Background Technology

[0002] Liquid-cooled circulating pumps are core power components in various liquid cooling systems (such as data center server cooling and high-power electronic device heat dissipation). Their performance and reliability directly affect the heat dissipation effect and operational stability of the entire system. The core function of the circulating pump is as a power source for the liquid cooling system, driving the circulation of coolant to achieve efficient and reliable heat transfer. It is widely used in server, electronic medical equipment cooling, and petrochemical fields. A key characteristic of wet-running circulating pumps compared to dry-running circulating pumps is the presence of a shielded tank. While isolating the stator and rotor, the shielded tank, through a specific structural design, allows for media circulation within the tank, with the circulating medium directly wetting the shaft and bearings. How to achieve internal water circulation within the shielded tank while fixing the bearings is a typical technical challenge for wet-running centrifugal pumps.

[0003] A search revealed that patent announcement number CN104024643B discloses a structure for fixing a bearing in a metal sealed container. The ceramic bearing is mounted in a bearing carrier formed by deep drawing from a sleeve. This bearing carrier has a wavy and / or serrated shape and is interference-fitted with the bottom stop of the metal sealed container, ensuring the bearing is centered and fixed within the container. This bearing mounting support structure requires high dimensional accuracy of components, has a complex shape, and involves numerous manufacturing processes.

[0004] Application publication number CN120262763A provides a rotor structure and a wet-running circulating pump with a rotor structure. The shielded tank assembly has a central fixed shaft d1. The shielded tank assembly d internally isolates the liquid inside the pump head a from contact with the stator assembly f. The stator assembly f includes a housing f1 and an armature winding f2. The housing f1, in conjunction with a housing sealing ring b1, externally isolates the liquid from contact with the armature winding f2. The shielded tank assembly d has a flanged upper plane d2 and a flanged lower plane d3. A housing sealing ring b1 is mounted on the housing flange end face f3, and the housing flange end face f3 is flush-connected to the flanged lower plane d3 of the shielded tank assembly d through the compressor housing sealing ring b1. A pump head sealing ring b is mounted on the flanged upper plane d2 of the shielded tank assembly d, and the flanged upper plane d2 is flush-connected to the inner cavity sealing surface a1 of the pump head a through the compressor housing sealing ring b. A bolt H passes through a fastening through hole a3 on the flange end face a2 of the pump head a. The bolt H passes through the fastening through hole d4 on the upper surface d2 of the flange of the shielded tank assembly d and is fastened to the threaded hole f4 on the end face f3 of the housing flange. This compresses the axial height of the pump head sealing ring b and the housing sealing ring b1, thereby achieving a seal between the water entering the inner cavity of the pump head a and the stator assembly f. This ensures that the rotor structure e and the central fixed shaft d1 inside the shielded tank assembly d are constantly wetted by the pumped medium. The central fixed shaft d1 inside the shielded tank assembly d is fixed to the shielded tank assembly d by insert injection molding, with the fixed position radially centered. This shielded tank assembly cannot achieve coolant circulation.

[0005] In summary, the technical problem that needs to be solved is how to design a shielded tank and circulation pump that can facilitate the installation of bearings and enable the circulation of coolant. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology, such as the complex bearing mounting support structure and the inability to achieve coolant circulation, by providing an integrated structure of bearing and shielding tank and a circulation pump.

[0007] The objective of this invention can be achieved through the following technical solutions.

[0008] According to one aspect of the present invention, an integrated bearing and shielding tank structure is provided, installed inside a circulating pump. The circulating pump is provided with a cooling channel. The integrated structure includes a shielding tank and a rear bearing assembly. The rear bearing assembly includes a rear bearing and a bearing fitting. The bearing fitting is installed between the end faces of the rear bearing and the interior of the shielding tank. A gap space is formed between the end face of the central shaft of the circulating pump and the end face of the bearing fitting and / or the interior of the shielding tank. The gap space communicates with a central bore inside the central shaft to form a fluid channel, which is part of the cooling channel.

[0009] As a preferred technical solution, the rear bearing is provided with a through water passage hole, and the gap space is connected to the through water passage hole.

[0010] As a preferred technical solution, the bearing accessory includes a first stepped surface and a second stepped surface. The rear bearing is mounted on the first stepped surface, and the second stepped surface is far from the central axis and has a diameter smaller than that of the first stepped surface. The second stepped surface and the end face of the central axis form a gap space.

[0011] As a preferred technical solution, the outer ring of the rear bearing is interference-fitted with the first stepped surface.

[0012] As a preferred technical solution, the bearing fittings and the inner end face of the shielding tank form a third stepped surface, and the diameter of the third stepped surface is smaller than the inner diameter of the rear bearing.

[0013] As a preferred technical solution, the shielding can is a plastic shielding can, and the rear bearing, bearing accessories and shielding can form an integral plastic-coated structure. The outer ring of the rear bearing has a groove along the circumferential direction, and the plastic of the integral plastic-coated structure is filled in the groove.

[0014] As a preferred technical solution, the circulating pump is further provided with a front bearing assembly, which includes a front bearing, a support member, and a rubber-coated part. The support member is fixed on the shielding tank, the front bearing is installed between the support member and the central shaft, the rubber-coated part is installed between the support member and the shielding tank and has a gap between it and the inner wall of the shielding tank, and the support member has a water passage hole.

[0015] As a preferred technical solution, the outer surface of the rubber-coated part has a convex circumferential stop, and the inner surface of the shielding tank has an inner diameter stop, and the inner diameter stop is positioned and connected with the convex circumferential stop.

[0016] As a preferred technical solution, the outer surface of the coated part has a water-passing concave surface, and there is a gap between the water-passing concave surface and the inner wall of the shielding tank.

[0017] As a preferred technical solution, the mounting end face of the shielding tank includes an upper flange face, which abuts against the support member.

[0018] According to another aspect of the invention, a circulating pump is provided having an integrated structure of bearing and shielding tank.

[0019] As a preferred technical solution, the circulating pump includes a pump head, the pump head cavity contains coolant, the inlet end and outlet end of the cooling channel are connected to the pump head cavity, and the outlet end is the end of the central shaft hole away from the rear bearing assembly.

[0020] As a preferred technical solution, the circulating pump includes a housing, on which a coolant inlet and a coolant outlet are provided. The inlet end and outlet end of the cooling channel are respectively connected to the inlet and outlet. The outlet end is the end of the central shaft hole away from the rear bearing assembly.

[0021] Compared with the prior art, the present invention has the following beneficial effects.

[0022] 1) The rear bearing assembly of this invention not only supports the installation of the rear bearing but also forms a gap space within the shielded container, which connects to the central shaft's core hole to form a fluid channel, serving as part of the coolant channel and enabling coolant flow. This gap space provides a temporary storage and transition cavity for the coolant, allowing it to converge and smoothly enter the central shaft's core hole. It also provides clearance for the central shaft's rotation, accommodating dynamic movement and thermal expansion, ensuring interference-free operation, eliminating friction and impact noise, significantly reducing operating noise, avoiding nonlinear contact excitation, saving frictional power consumption, optimizing bearing load, and improving rotor assembly operating efficiency. This invention can cool the rotor assembly, achieving a high degree of integration between structural load-bearing and fluid transport functions, simplifying the media flow system, and improving space utilization and reliability.

[0023] 2) The rear bearing of the present invention is provided with a through water passage hole, which allows the coolant to cool and lubricate the rear bearing when passing through the through water passage hole.

[0024] 3) The bearing fitting of this invention achieves the installation of the rear bearing through a first stepped surface, and a gap space is formed between the second stepped surface and the end face of the central shaft. The stepped surface design simplifies the machining structure and allows the size of the gap space to be changed by adjusting the second stepped surface to adapt to the coolant flow requirements. The diameter of the second stepped surface is smaller than that of the first stepped surface, ensuring that the rear bearing can be stably mounted on the first stepped surface.

[0025] 4) The outer ring of the bearing of the present invention is interference-fitted with the first stepped surface, which can ensure the stability of bearing installation and the firmness of injection molding connection.

[0026] 5) The bearing fittings of the present invention form a third stepped surface with the inner end face of the shielding tank, which can be used for plastic coating of the rear bearing and bearing fittings. When plastic coating, the diameter of the mold and the third stepped surface are the same, and the third stepped surface provides positioning for the mold. The diameter of the third stepped surface is smaller than the inner diameter of the rear bearing, so the mold will not interfere with the rear bearing when it is installed.

[0027] 6) This invention simplifies the overall structure through its integrated plastic-coated structure, effectively solving the problem of inconvenient installation of the rear bearing assembly and preventing the rear bearing from loosening. The outer ring of the rear bearing has a circumferentially grooved and filled with plastic to form a locking structure, restricting the axial movement and radial rotation of the rear bearing; it also ensures unobstructed cooling by aligning the through-hole with the cooling channels that are always aligned on both sides.

[0028] 7) In the front bearing assembly of this invention, the gap between the water passage hole on the support, the rubber-coated part, and the inner wall of the shielding tank forms part of the coolant channel; the support also provides a mounting surface for the front bearing. The outer surface of the rubber-coated part has a convex circumferential stop and a water passage concave surface, and the inner surface of the shielding tank has an inner diameter stop. The convex circumferential stop and the inner diameter stop cooperate to fix the position of the rubber-coated part, and the water passage concave surface can meet the requirements for coolant passage.

[0029] 8) The mounting end face of the shielding tank of the present invention is connected to the support member through the upper flange face to form a stable connection structure.

[0030] 9) The cooling channel of the circulating pump of the present invention is connected to the pump head, and the coolant in the pump head flows into the cooling channel to realize the internal circulation of the coolant in the circulating pump.

[0031] 10) The cooling channel of the circulating pump of the present invention is connected to the coolant inlet and coolant outlet. External coolant flows into the cooling channel to realize the external circulation of the coolant in the circulating pump, which is suitable for situations where the rotor assembly and the pump head have different cooling temperature requirements. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of an integrated bearing and shielding tank structure according to the present invention.

[0033] Figure 2 This is a schematic diagram of the shielding tank and rear bearing assembly of the present invention.

[0034] Figure 3 This is a schematic diagram of the front bearing assembly of the present invention.

[0035] Figure 4 This is a structural schematic diagram of the bearing component of the present invention.

[0036] Figure 5 This is a schematic diagram of the structure of the rear bearing of the present invention.

[0037] Figure 6 This is a schematic diagram of the integrated plastic coating of the rear bearing and bearing accessories of the present invention.

[0038] Figure 7 This is a schematic diagram of the structure of a circulating pump according to the present invention.

[0039] The numbers in the diagram are as follows: 1. Housing; 10. Housing flange end face; 2. Pump head; 20. Cavity; 21. Inner cavity sealing surface; 22. Pump head; 3. Rotor assembly; 30. Central shaft; 300. Shaft bore; 4. Stator assembly; 40. Armature winding; 50. Shielding can; 500. Inner diameter stop; 501. Upper flange surface; 502. Lower flange surface; 503. Upper flange face; 505. Housing sealing ring; 506. Pump head sealing ring; 51. Front bearing assembly; 510 511 Front bearing, 511 Support component, 5110 Water passage hole, 512 Rubber-coated component, 5120 Convex circumferential stop, 5121 Water passage concave surface, 52 Rear bearing assembly, 520 Rear bearing, 5200 Through water passage hole, 5201 Groove, 5202 Upper end face of rear bearing, 521 Bearing accessory, 5210 First stepped surface, 5211 Second stepped surface, 5212 Third stepped surface, 6 Mold, 60 Lower end face of mold. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0041] Example 1 This embodiment provides an integrated bearing and shielding tank structure, which is installed inside a circulating pump. The circulating pump is provided with a cooling flow channel. The integrated bearing and shielding tank structure includes a shielding tank 50 and a rear bearing assembly 52 installed inside the shielding tank 50.

[0042] The rear bearing assembly 52 includes a rear bearing 520 and a bearing fitting 521. For example... Figure 2 As shown, bearing fitting 521 is installed between the rear bearing 520 and the end face (bottom face) inside the shielding tank 50. When bearing fitting 521 completely covers the end face inside the shielding tank 50, a gap space is formed between the end face of the central shaft 30 of the circulating pump and bearing fitting 521; when bearing fitting 521 partially covers the end face inside the shielding tank 50, a gap space is formed between the end face of the central shaft 30 of the circulating pump and the end face of both bearing fitting 521 and the shielding tank 50; when bearing fitting 521 does not cover the end face inside the shielding tank 50, a gap space is formed between the end face of the central shaft 30 of the circulating pump and the end face of the shielding tank 50. The gap space communicates with the spindle hole 300 inside the central shaft 30 to form a fluid channel, which is part of the cooling flow channel.

[0043] Example 2 This embodiment provides an integrated structure of bearing and shielding tank, installed inside a circulating pump, including the same shielding tank 50 and rear bearing assembly 52 as in Embodiment 1.

[0044] like Figure 4 As shown, further, in this embodiment, the bearing accessory 521 is installed inside the shielding tank body 50 at one end away from the circulation pump head 2. The bearing accessory 521 includes a first stepped surface 5210 and a second stepped surface 5211 with different diameters. The second stepped surface 5211 is away from the circulation pump head 2 and its diameter is smaller than that of the first stepped surface 5210. A portion of the rear bearing 520 is located between the central shaft 30 and the inner wall of the shielding tank body 50, and another portion is located between the first stepped surface 5210 and the central shaft 30. The outer ring of the rear bearing 520 is interference-fitted with the first stepped surface 5210. The space formed by the second stepped surface 5211, the end face of the rear bearing 520, and the end face of the central shaft 30 communicates with the shaft hole 300 inside the central shaft 30. The gap space formed by the second stepped surface 5211, the end face of the rear bearing 520 and the end face of the central shaft 30 provides clearance space for the rotation of the central shaft 30, ensuring that the operation is free from interference. It also provides a temporary storage and transition cavity for the coolant, so that the coolant can be briefly gathered here and then smoothly enter the central hole of the central shaft 30.

[0045] Example 3 This embodiment provides an integrated structure of bearing and shielding tank, installed inside a circulating pump, including the same shielding tank 50 and rear bearing assembly 52 as in Embodiment 2.

[0046] like Figure 4 As shown, further, in this embodiment, the bearing component 521 and the inner end face of the shielding can 50 form a third stepped surface 5212. The diameter of the third stepped surface 5212 is smaller than that of the second stepped surface 5211. The mold 6 required for plastic coating is positioned through the third stepped surface 5212. The upper end face 5202 of the rear bearing fits against the lower end face 60 of the mold. The inner diameter of the rear bearing 520 is larger than the diameter of the third stepped surface 5212 to prevent interference between the mold and the rear bearing 520 during installation. After integral plastic coating, axial movement and radial rotation of the rear bearing 520 can be prevented.

[0047] The references in Examples 2 and 3 Figure 4 This is a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The first stepped surface, the second stepped surface, the third stepped surface or other structures can be set according to the actual needs of the product. For example, a fourth stepped surface or other shaped surfaces can be set to form different gap spaces in order to change the shape of the fluid channel.

[0048] Example 4 This embodiment provides an integrated structure of bearing and shielding tank, installed inside a circulating pump, including the same shielding tank 50 and rear bearing assembly 52 as in Embodiment 1.

[0049] Furthermore, in this embodiment, at least one through-hole 5200 is provided between the inner and outer rings of the rear bearing 520; when the through-hole 5200 is arranged axially, it is easy to process; a gap space is formed between the end face of the central shaft 30 of the circulating pump and the end face inside the bearing accessory 521 and / or the shielding tank 50, which communicates with the through-hole 5200 and the spindle hole 300 inside the central shaft 30, and the coolant passing through the rear bearing 520 can help cool and lubricate the inner wall of the rear bearing 520.

[0050] Example 5 This embodiment provides an integrated structure of bearing and shielding tank, installed inside a circulating pump, including a shielding tank 50 and a rear bearing assembly 52, which are the same as those in Embodiment 1 or Embodiment 4.

[0051] Furthermore, in this embodiment, the shielding container 50 is a plastic shielding container 50, such as... Figure 6 As shown, the rear bearing 520, bearing accessory 521, and shielding canister 50 are integrated through a plastic coating process, as follows: Figure 5 As shown, the outer ring of the rear bearing 520 has at least one slot 5201 along the circumferential direction. The plastic material of the integral plastic-coated structure is filled in the slot 5201 to form a locking structure, which restricts the axial movement and radial rotation of the rear bearing 520 and ensures the stable installation of the rear bearing 520. When it has a through water hole 5200, it can also keep the installation position of the rear bearing 520 fixed and accurately connect with the cooling channels on both sides to ensure the smooth flow of the cooling channels.

[0052] Example 6 This embodiment provides an integrated structure of bearing and shielding tank, installed inside a circulating pump, including the same shielding tank 50 and rear bearing assembly 52 as in Embodiment 1.

[0053] Furthermore, in this embodiment, the circulating pump also includes a front bearing assembly 51, and the front bearing assembly 51 and the rear bearing assembly 52 are respectively mounted at both ends of the central shaft 30; as shown Figure 3 As shown, the front bearing assembly 51 includes a front bearing 510, a support 511, and a rubber-coated component 512. The shielded tank 50 includes a mounting end face and a tank body; the mounting end face includes an upper flanged surface 501, a lower flanged surface 502, and an upper flanged surface 503. The upper flanged surface 501 abuts against the inner cavity sealing surface 21 of the circulating pump head 2 through a sealing ring, and the lower flanged surface 502 abuts against the flanged end face of the circulating pump housing 1 through a sealing ring; the inner surface of the tank body has an inner diameter stop 500.

[0054] The first end of the support member 511 is attached to the upper flange face 503 of the shielding tank 50 to achieve axial positioning, and the second end extends into the interior of the shielding tank 50. The front bearing 510 is installed between the second end of the support member 511 and the central shaft 30. The rubber-coated part 512 is installed between the second end of the support member 511 and the shielding tank 50. There is a gap between the rubber-coated part 512 and the inner wall of the shielding tank 50. The first end of the support member 511 has a water passage hole 5110 on the side near the rubber-coated part 512. The water passage hole 5110 connects to the cavity 20 inside the pump head 2.

[0055] The outer surface of the rubber-coated part 512 has a concave-convex structure. The protrusion is a convex circumferential stop 5120, and the inner diameter stop 500 is positioned and connected with the convex circumferential stop 5120. The groove is a water-passing concave surface 5121, and there is a gap between the water-passing concave surface 5121 and the inner wall of the shielding tank 50.

[0056] Example 7 This embodiment provides a circulating pump, including a housing 1, a pump head 2, an impeller, a rotor assembly 3, and a stator assembly 4. The impeller is located inside the pump head 2. The circulating pump also includes a shielding tank 50 and a rear bearing assembly 52, as described in embodiments 1-4. The shielding tank 50 is fixed to the housing 1, the rotor assembly 3 is located inside the shielding tank 50, and the stator assembly 4 is located between the shielding tank 50 and the housing 1. The pump head 2 is fastened to one end of the housing 1 where the shielding tank 50 is fixed. The cavity 20 inside the pump head 2 contains coolant. The rotor assembly 3 includes a central shaft 30, which is a hollow shaft. When a front bearing assembly 51 is included, the front bearing assembly 51 and the rear bearing assembly 52 are respectively installed at both ends of the central shaft 30. The cavity 20 inside the pump head 2 communicates with the interior of the shielding tank 50 through the front bearing assembly 51. Figure 7 As shown; when the front bearing assembly 51 is not present, the cavity 20 inside the pump head 2 is directly connected to the interior of the shielding tank 50. The rear bearing assembly 52 is installed at one end of the central shaft 30; the interior of the shielding tank 50 and the central shaft 30 are connected through the rear bearing assembly 52, and the other end of the central shaft 30 extends into the cavity 20 inside the pump head 2; the stator assembly 4 has an armature winding 40, and the housing 1, in conjunction with a sealing ring, isolates the coolant from the armature winding 40 externally; the shielding tank internally isolates the coolant in the cavity 20 inside the pump head 2 from the stator assembly 4.

[0057] The pump head 2 is fastened to the flange end face 10 of the housing by bolt pre-tightening, which compresses the axial height of the pump head sealing ring 506 and the housing sealing ring 505, thereby isolating the coolant transported in the inner cavity of the pump head 2 from the stator assembly 4 and preventing liquid leakage to the outside of the pump body. The rotor assembly 3 is an integral structure that rotates around the central shaft 30, which is mounted between the front bearing assembly 51 and the rear bearing assembly 52. ​​The coolant transported in the cavity 20 of the pump head 2 flows into the interior of the shielded tank when the circulating pump is working, and wets the rotor assembly 3, the central shaft 30, the rear bearing 520, and the front bearing 510.

[0058] like Figure 1 As shown, during operation, due to the pressure difference, the coolant enters the shielded tank through the water passage 5110 of the support 511 and the water passage concave surface 5121 of the rubber-coated part 512. Then, it flows through the through water passage 5200 of the rear bearing 520 and the gap space to the shaft hole 300 in the central shaft 30, and then sprays out from the other end, forming a closed cooling channel to realize the circulation of coolant (or other cooling medium) in the shielded tank.

[0059] Example 8 This embodiment provides a circulating pump. Unlike embodiment 5, the housing 1 is provided with a coolant inlet and a coolant outlet. When the front bearing assembly 51 is present, the front bearing assembly 51 is connected to the inlet, and the other end of the central shaft 30 is connected to the outlet. When the front bearing assembly 51 is not present, the inside of the shielded tank 50 is directly connected to the inlet, and the other end of the central shaft 30 is connected to the outlet.

[0060] The cooling channel formed by this invention achieves a high degree of integration of structural load-bearing and fluid transport functions, simplifies the media channel system, and improves space utilization and reliability. The integrated plastic-coated rear bearing 520, bearing accessories 521, and plastic shielding tank 50 solve the problems of complex and easily loosened traditional bearing structures while ensuring the smooth flow of the media circulation channel.

[0061] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A bearing and shield can integrated structure installed in a circulating pump provided with a cooling flow path, characterized by, The integrated structure comprises a shielded tank (50) and a rear bearing assembly (52), the rear bearing assembly (52) comprises a rear bearing (520) and a bearing fitting (521), the bearing fitting (521) is installed between the end face of the rear bearing (520) and the inner end face of the shielded tank (50), and the gap space is formed between the end face of the central shaft (30) of the circulating pump and the bearing fitting (521) and / or the inner end face of the shielded tank (50); the gap space is communicated with the shaft hole (300) in the central shaft (30) to form a fluid passage, and the fluid passage is part of a cooling flow channel.

2. The integrated bearing and can structure of claim 1, wherein, The rear bearing (520) is provided with a through water hole (5200), and the gap space is communicated with the through water hole (5200).

3. The integrated bearing and can structure of claim 1, wherein, The bearing fitting (521) comprises a first stepped surface (5210) and a second stepped surface (5211), the rear bearing (520) is installed on the first stepped surface (5210), the second stepped surface (5211) is away from the central shaft (30) and has a smaller diameter than the first stepped surface (5210); and the second stepped surface (5211) and the end face of the central shaft (30) form the gap space.

4. The integrated bearing and can structure of claim 3, wherein, The outer ring of the rear bearing (520) is in interference fit with the first stepped surface (5210).

5. The integrated bearing and shield can structure of claim 3, wherein, The bearing fitting (521) and the inner end face of the shielded tank (50) form a third stepped surface (5212), and the diameter of the third stepped surface (5212) is smaller than the inner diameter of the rear bearing (520).

6. The integrated bearing and can structure of claim 1 or 2, wherein The shielded tank (50) is a plastic shielded tank (50), the rear bearing (520), the bearing fitting (521) and the shielded tank (50) form an integrated plastic package structure, the outer ring of the rear bearing (520) is provided with a notch (5201) in the circumferential direction, and the plastic of the integrated plastic package structure is filled in the notch (5201).

7. The integrated bearing and can structure of claim 1, wherein The circulating pump is also provided with a front bearing assembly (51), the front bearing assembly (51) comprises a front bearing (510), a support piece (511) and a rubber coating piece (512), the support piece (511) is fixed on the shielded tank (50), the front bearing (510) is installed between the support piece (511) and the central shaft (30), the rubber coating piece (512) is installed between the support piece (511) and the shielded tank (50) and has a gap between the rubber coating piece (512) and the inner wall of the shielded tank (50), and the support piece (511) has a water passing hole (5110).

8. The integrated bearing and can structure of claim 7, wherein, The outer surface of the rubber coating piece (512) has a convex circumferential stop (5120), the inner surface of the shielded tank (50) has an inner diameter stop (500), and the inner diameter stop (500) is positioned and connected with the convex circumferential stop (5120).

9. The integrated bearing and can structure of claim 7, wherein, The outer surface of the rubber coating piece (512) has a water passing concave surface (5121), and the water passing concave surface (5121) has a gap between the water passing concave surface (5121) and the inner wall of the shielded tank (50).

10. The integrated bearing and can structure of claim 7, wherein, The mounting end face of the shielded tank (50) comprises an upper flange surface (503), and the upper flange surface (503) abuts against the support piece (511).

11. A circulation pump characterized by, The circulating pump has the bearing and shielded tank integrated structure as claimed in any one of claims 1-9.

12. The circulation pump of claim 11, wherein, The circulating pump comprises a pump head (2) with cooling liquid in the cavity, and the inlet and outlet of the cooling flow channel are communicated with the cavity of the pump head (2), and the outlet is the end of the shaft hole (300) in the center shaft (30) far away from the rear bearing assembly (52).

13. The circulation pump of claim 11, wherein, The circulating pump comprises a casing (1) provided with a cooling liquid inlet and a cooling liquid outlet, and the inlet and outlet of the cooling flow channel are communicated with the inlet and outlet respectively, and the outlet is the end of the shaft hole (300) in the center shaft (30) far away from the rear bearing assembly (52).

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