A bearing support for a pump and a wet-running pump unit having the bearing support

Abstract

The present invention relates to a bearing support for a pump and a wet-running pump unit equipped with the bearing support. The bearing support is mounted on the wet-running pump unit, which includes a pump head assembly, a shielding can, a bearing support, a front bearing, and a rotor assembly. The bearing support includes a radially extending disc surface that is sealed with a mating surface of the shielding can. The radially extending disc surface or the mating surface of the shielding can is provided with a through groove for forming a first fluid channel. Compared with the prior art, the present invention not only improves manufacturing efficiency and saves costs, but also increases assembly precision and improves the efficiency of liquid flow into the shielding can.

Description

Technical Field

[0001] The present invention relates to a wet-running pump unit, in particular to a bearing support for a pump and a wet-running pump unit having the bearing support. Background Art

[0002] Centrifugal pumps used in heating and cooling systems operate in liquid environments. A typical feature of wet-running centrifugal pumps is that the rotor and bearing support system are housed within a shielded tank, converting dynamic seals into static seals and effectively preventing liquid leakage. The centrifugal pump's rotor and bearings are located within the shielded tank, which is in close contact with the stator. The motor stator is one of the primary heat sources generated during operation by the pump unit. During operation, the shielded tank is filled with working fluid, and heat from the stator is transferred through the shielded tank to the working fluid. The fluid within the shielded tank then exchanges with the cooling fluid in the system through circulation channels, removing heat and providing cooling and lubrication for the bearings.

[0003] The bearing support of a typical centrifugal pump is mounted on a shielded tank. This supports the bearings and isolates the shielded tank from the pump chamber into two relatively closed, independent chambers: the impeller chamber and the rotor chamber. When the pump is not operating, due to temperature differences and thermal expansion of the liquid, the liquid flows axially along the lubricating film between the rotating shaft and the radial bearing. This can easily deposit scale between the rotating shaft and the radial bearing, causing the rotating shaft to rotate poorly, which hinders the pump unit's startup. When the pump unit is operating, the impeller rotates in the impeller chamber. To drive the fluid circulation within the pump, the liquid must flow from the impeller chamber into the rotor chamber to cool the motor and then return to the impeller chamber. This requires the proper placement of the pump unit's components and the structural adjustments of the components, particularly the bearing support that isolates the shielded tank from the pump chamber, to provide a viable fluid path for the motor cooling fluid circulation.

[0004] For the existing pump fluid circuit, when the pump is working, the impeller rotates in the impeller chamber, forming high-pressure and low-pressure areas in the water pressure chamber. The pressure difference between the high-pressure and low-pressure areas provides power for the liquid to flow in the channel. Since the liquid contains hard particles such as magnetite and calcification, when there is axial flow of liquid in the gap between the bearing and the rotating shaft, the hard particles will enter the bearing gap and deposit, causing difficulty in starting or running; in addition, when the pump unit is installed horizontally, the water passing through the gap between the bearing and the rotating shaft cannot completely fill the rotor chamber, that is, the shielding tank, and the air cannot be completely discharged. This will cause a series of problems such as low pump efficiency, dry friction of the bearings, improper heat dissipation of the motor, and the rotor driving the liquid to collide in the shielding tank chamber to form water hammer and noise.

[0005] After consulting the prior art, Chinese Patent Publication No. CN104040182A discloses a pump unit design that includes a disc-shaped bearing seat made of metal and discloses a structure in which the centering surface of the bearing seat is against the pump head housing and centered. However, the patent does not provide a specific solution for the concentric assembly of the front bearing and the shield tank. In addition, Chinese Patent Publication No. CN113137396 A discloses a bearing retainer that is provided with a radially outer section extending radially outward from the inner section, wherein the radially inner section defines at least one first axial fluid channel, and the radially outer section defines at least one second axial fluid channel, and the fluid flow path is constructed by the fluid channels. However, the first fluid channel provided by the bearing retainer includes an axial fluid path flowing from the gap between the rotating shaft and the bearing, which will cause scale deposition in the gap, bringing serious problems. The structure of the second fluid channel is an axial fluid channel, which requires additional drilling in the axial end face of the bearing retainer, and the drilling process is electro-erosion drilling or laser ablation drilling, which consumes manpower, material and financial resources.

[0006] Therefore, in order to solve the above-mentioned defects of the prior art, it is necessary to design a bearing support with good performance, and to combine it with a good fluid path design, and the relieved fluid channel also needs to solve this problem at the same time. Summary of the Invention

[0007] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a pump bearing support and a wet-running pump unit having the bearing support, which not only improves manufacturing efficiency and saves costs, increases assembly accuracy, but also increases the efficiency of liquid flowing into the shielding tank.

[0008] The purpose of the present invention can be achieved by the following technical solutions:

[0009] According to one aspect of the present invention, there is provided a bearing support for a pump, the bearing support being mounted on a wet-running pump unit, the wet-running pump unit comprising a pump head assembly, a shielding can, a bearing support, a front bearing, and a rotor assembly, the bearing support comprising a radially extending disc surface;

[0010] The radially extending disc surface is sealedly connected to the shield tank matching surface, and the radially extending disc surface or the shield tank matching surface is provided with a through groove for forming a first fluid channel.

[0011] As a preferred technical solution, the through groove is connected to the high-pressure area of ​​the water pressure chamber of the pump head assembly, and the liquid in the high-pressure area of ​​the water pressure chamber of the pump head assembly enters the shielding tank through the radial fluid channel and fills it.

[0012] As a preferred technical solution, the radially extending disc surface is provided with an arched portion avoiding the through groove.

[0013] As a preferred technical solution, the rotor assembly is immersed in the shielding tank liquid, and the liquid flows to the water inlet of the water pressure chamber of the pump head assembly through the pinhole built into the rotating shaft of the rotor assembly, forming a second fluid channel for the liquid inside the shielding tank.

[0014] As a preferred technical solution, the pump bearing support further includes a second flange connected to the arch portion, a first flange connected to the second flange, and a bearing installation chamber formed by the first flange.

[0015] As a preferred technical solution, the first flange is provided with a step avoidance space in the radial direction that matches the first inner diameter of the shielding tank, and the second flange uses the bearing mounting chamber as a coaxiality reference and is clearance-matched with the first inner diameter of the shielding tank.

[0016] As a preferred technical solution, the bearing mounting chamber and the front bearing are interference fit, and the front bearing and the second flange are concentrically assembled.

[0017] As a preferred technical solution, the radially extending disc surface, the through groove, the arched portion, the first flange, the second flange, and the bearing mounting chamber are integrally formed metal parts by stamping and stretching.

[0018] As a preferred technical solution, there is one or more through grooves.

[0019] According to another aspect of the present invention, a wet-running pump unit with a bearing support is provided, comprising a pump head assembly, an impeller, an impeller cover, a flat sealing ring, a shielding can, a front bearing, an axial stop bearing, an axial stop bearing rubber sleeve, a rear bearing, a rear bearing support, a rotor assembly, and a stator assembly, wherein the rotor assembly comprises a rotating shaft and a permanent magnet, and the wet-running pump unit also comprises the pump bearing support.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1) Compared with the traditional fluid channel structure, i.e., the axial opening, the radial fluid channel structure of the present invention can be more conducive to the flow of liquid into the shielding tank and discharge more gas in the rotor chamber, i.e., the shielding tank. The radial fluid channel designed in the present invention can even discharge all the gas inside the shielding tank and fill it with liquid, which improves the efficiency of the pump and the effect of the bearing being lubricated by liquid.

[0022] 2) Compared with traditional processing methods, such as the processing of axial fluid channels, which requires the addition of axial holes, the process of axial holes is electro-etching or laser ablation, which is time-consuming and costly. The radial fluid channels supported by the pump bearings of the present invention are realized by a stamping process. The radial fluid channels can be punched out with a hole or groove structure on the radially extended disc surface during the stamping process, and are stamped integrally with the radially extended disc surface, the arched portion, the first flange, the second flange, and the bearing mounting chamber, thereby greatly saving manufacturing costs and improving production efficiency.

[0023] 3) The portion of the radially extending disc facing the bearing mounting chamber of the present invention is designed as an arched structure. The arched portion increases the overall rigidity of the bearing support and reduces the deformation of the bearing support after being subjected to fluid pressure.

[0024] 4) The bearing mounting chamber of the present invention has an interference fit with the front bearing, and the deformation of the first flange caused by the interference fit is accommodated by the step avoidance space, thereby ensuring that the micro-clearance fitting size between the second flange and the first inner diameter is not interfered with or damaged.

[0025] 5) The present invention not only improves manufacturing efficiency, saves costs, and increases assembly accuracy, but also increases the efficiency of liquid flowing into the shielding tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of a wet-running pump unit with a pump bearing support according to the present invention;

[0027] Figure 2 Schematic cross-sectional view of a bearing support for a pump according to the present invention;

[0028] Figure 3 This is a schematic structural diagram of a bearing support for a pump according to the present invention;

[0029] Figure 4 Schematic diagram of the sealing welding between the pump bearing support and the shielding tank of the present invention;

[0030] Figure 5 This is a schematic structural diagram of the shielding tank of the present invention;

[0031] Figure 6 This is a schematic diagram of the structure in which the fluid channel of the present invention is opened on the shielding tank;

[0032] Figure 7 Schematic diagram of the fluid and channel of the present invention;

[0033] Among them, 1 is the pump head assembly, 2 is the impeller, 3 is the impeller cover, 4 is the flat sealing ring, 5 is the shielding tank, 6 is the bearing support, 7 is the front bearing, 8 is the axial stop bearing, 9 is the axial stop bearing sleeve, 10 is the rear bearing, 11 is the rear bearing support, 12 is the rotor assembly, 13 is the stator assembly, 14 is the rotating shaft, 15 is the permanent magnet, 16 is the radially extending disc surface, 17 is the through groove, 18 is the arched portion, 19 is the first flange, 20 is the second flange, 21 is the bearing mounting chamber, 22 is the shielding tank mating surface, 23 is the high-pressure area of ​​the water pressure chamber, 24 is the first inner diameter, 25 is the pinhole, 26 is the water inlet of the water pressure chamber, S1 is the first fluid channel, S2 is the second fluid channel, and T1 is the step avoidance space. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0035] Example 1

[0036] The present invention provides a bearing support for a pump, which is installed on a wet-running pump unit, wherein the wet-running pump unit includes a pump head assembly, a shielding tank, a front bearing and a rotor assembly. Figure 2 、 Figure 3 、 Figure 4 As shown, the pump bearing support includes a radially extending disc surface 16, a through-groove 17 provided therein, an arched portion 18 avoiding the through-groove, a first flange 18, a second flange 20, and a bearing mounting chamber 21. The through-groove 17 provided on the radially extending disc surface 16 can be one or more, and its shape is not restricted; it only needs to be through-groove. The through-groove 17 and the shield tank mating surface 22 are connected without sealing to form a radial first fluid passage S1. Compared to the axial fluid passage, the radial fluid passage is completely independent of the pump assembly installation position.

[0037] like Figure 5 、 Figure 6 As shown, during the specific implementation of the shield tank, the through groove 17 may be opened on the shield tank matching surface 22 to form a radial first fluid channel S1 in cooperation with the radially extending disc surface 16 .

[0038] like Figure 4 、 Figure 7As shown, the through-groove 17 on the radially extending disc surface 16 of the pump bearing supports communicates with the high-pressure area 23 of the water pressure chamber of the pump head assembly 1. When the pump unit is powered on, the rotor assembly 12 rotates, driving the impeller 2 to pump water. The impeller 2 and the water pressure chamber of the pump head assembly 1 work together to allow liquid to enter the water pressure chamber through the water inlet 26 and then flow out of the high-pressure area 23 of the water pressure chamber. Simultaneously, liquid in the high-pressure area 23 of the water pressure chamber of the pump head assembly enters the shield tank 5 through the first fluid channel S1, filling it completely. This reduces the motor's operating temperature and ensures that the front bearing 7, rear bearing 10, and rotor assembly 12 are constantly immersed in liquid. Once the shield tank 5 is filled, the liquid is discharged from the low-pressure area through the second fluid channel S2 built into the rotating shaft 14.

[0039] like Figure 2 、 Figure 3 As shown, the portion of the radially extending disc surface 16 of the pump bearing support facing the bearing mounting chamber 21 is designed as an arched structure, specifically, arched portion 18. Arched portion 18 increases the overall rigidity of the bearing support 6 and reduces deformation of the bearing support 6 under fluid pressure. The pump bearing support is made of a metal material that is easily stretched and stamped. The through-groove 17 on the radially extending disc surface 16 is manufactured using a metal stamping process. The arched portion 18, first flange 19, second flange 20, and bearing mounting chamber 21 are manufactured using a one-piece metal stretching process.

[0040] like Figure 4 As shown, the pump bearing supports the first flange 19 with a radially defined step clearance space T1 that mates with the first inner diameter 24 of the shield can 5. The second flange 20 uses the bearing mounting chamber 21 as a coaxial reference and has a slight clearance fit with the first inner diameter 24 of the shield can 5. The bearing mounting chamber 21 has an interference fit with the front bearing 7. Deformation of the first flange 19 caused by the interference fit is accommodated by the step clearance space T1, thereby ensuring that the slight clearance fit between the second flange 20 and the first inner diameter 24 is not disrupted, achieving concentric assembly of the front bearing 7 and the second flange 20.

[0041] like Figure 7 As shown, a pump bearing support and a wet-running pump unit having such a structure, wherein the rotor assembly 12 is immersed in the liquid of the shield tank 5, and the liquid flows to the water inlet 26 of the water pressure chamber of the pump head assembly 1 through the pinhole 25 built into the rotating shaft 14, thereby forming a second fluid channel S2 for the liquid inside the shield tank 5.

[0042] Compared with the prior art, the present invention not only improves manufacturing efficiency, saves costs, and increases assembly accuracy, but also increases the efficiency of liquid flowing into the shielding tank.

[0043] Example 2

[0044] like Figure 1As shown, a wet-running pump unit with a pump bearing support includes a pump head assembly 1, an impeller 2, an impeller cover 3, a flat sealing ring 4, a front bearing 7, an axial stop bearing 8, an axial stop bearing rubber sleeve 9, a rear bearing 10, a rear bearing support 11, a rotor assembly 12, and a stator assembly 13. The rotor assembly includes a rotating shaft 14 and a permanent magnet 15. The wet-running pump unit also includes the pump bearing support of Example 1.

[0045] The stator assembly 13 axially fixes the pump head assembly 1 through the flat seal 4, the stator assembly 13 fixes the shielding tank 5 in the axial and radial directions, the shielding seal tank 5 fixes the bearing support 6 and the rear bearing support 11 in the axial and radial directions respectively, the shielding seal tank 5 fixes the pump head assembly 1 in the radial direction, the bearing support 6 and the rear bearing support 11 fix the front bearing 7 and the rear bearing 10 in the axial and radial directions respectively, the rotor assembly 12 includes a rotating shaft 14 and is limited by the front bearing 7 and the rear bearing 10 in the diameter direction through the rotating shaft 14, the axial stop bearing 8 is fixed to the rotor assembly through the stop bearing rubber sleeve 9, the rotor assembly 12 is limited by the axial stop bearing 8 in the axial direction, the impeller 2 and the impeller cover 3 are fixed together by hot melt welding technology, and the impeller 2 is interference connected with the rotating shaft 14.

[0046] 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 such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A bearing support for a pump, the bearing support being mounted on a wet-running pump unit, the wet-running pump unit comprising a pump head assembly (1), a shielding tank (5), a bearing support (6), a front bearing (7) and a rotor assembly (12), characterized in that: The bearing support (6) includes a radially extending disc surface (16); The radially extending disc surface (16) is sealedly connected to the shield tank mating surface (22), and the radially extending disc surface (16) or the shield tank mating surface (22) is provided with a through groove (17) for forming a first fluid channel (S1); The through groove (17) is in communication with the high-pressure area (23) of the water pressure chamber of the pump head assembly (1), and the liquid in the high-pressure area (23) of the water pressure chamber of the pump head assembly (1) enters the interior of the shield tank (5) through the first fluid channel (S1) and fills the shield tank (5); the radially extending disc surface (16) is provided with an arched portion (18) that avoids the through groove (17); The pump bearing support further comprises a second flange (20) connected to the arch portion (18), a first flange (19) connected to the second flange (20), and a bearing mounting chamber (21) formed by the first flange (19); the first flange (19) is provided with a step avoidance space (T1) in the radial direction that matches the first inner diameter (24) of the shielding tank (5); the second flange (20) uses the bearing mounting chamber (21) as a coaxiality reference and is clearance-matched with the first inner diameter (24) of the shielding tank (5); The radially extending disc surface (16), the through groove (17), the arched portion (18), the first flange (19), the second flange (20), and the bearing mounting chamber (21) are integrally formed metal parts by stamping and stretching.

2. A pump bearing support according to claim 1, characterized in that: The rotor assembly (12) is immersed in the liquid of the shielding tank (5), and the liquid flows to the water inlet (26) of the pressure chamber of the pump head assembly (1) through the pinhole (25) built into the rotating shaft (14) of the rotor assembly (12), thereby forming a second fluid channel (S2) for the liquid inside the shielding tank (5).

3. A pump bearing support according to claim 1, characterized in that: The bearing mounting chamber (21) is interference-fitted with the front bearing (7), and the front bearing (7) is concentrically assembled with the second flange (20).

4. A pump bearing support according to claim 1, characterized in that: There is one or more through grooves (17).

5. A wet-running pump unit with a bearing support, comprising a pump head assembly (1), an impeller (2), an impeller cover (3), a flat sealing ring (4), a shielding can (5), a front bearing (7), an axial stop bearing (8), an axial stop bearing rubber sleeve (9), a rear bearing (10), a rear bearing support (11), a rotor assembly (12), and a stator assembly (13), wherein the rotor assembly comprises a rotating shaft (14) and a permanent magnet (15), and is characterized in that: The wet-running pump unit further comprises a pump bearing support as described in any one of claims 1-4.

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