Shield pump radial bearing, shield pump bearing assembly and shield pump

Abstract

The embodiment of the utility model provides a shield pump radial bearing, a shield pump bearing assembly and a shield pump, and relates to the field of energy storage heat management temperature control units. The problem that the service life of a radial bearing of a shield pump cannot meet the requirements of an energy storage system can be solved. A plurality of first spiral grooves with the same rotating direction are formed in the inner surface of the radial bearing at intervals in the circumferential direction; each first spiral groove surrounds the center line of the radial bearing and is spirally arranged in the axial direction of the radial bearing, and each first spiral groove communicates with the two ends of the radial bearing. The shield pump bearing assembly and the shield pump comprise the radial bearing. A first spiral groove is engraved in the inner surface of the radial bearing, the local liquid film flow speed can be increased, impurities in a bearing gap can be rapidly conveyed, the bearings are prevented from being damaged, meanwhile, due to increase of the flow speed, heat generated by friction between the rotor assembly and the radial bearing and friction between the radial bearing and the thrust bearing can be taken away more rapidly, and the service life of the thrust bearing is prolonged. And the service lives of the bearing and the rotor are prolonged.

Description

Technical Field

[0001] The utility model relates to the field of energy storage thermal management temperature control units, and in particular to a shielded pump radial bearing, a shielded pump bearing assembly and a shielded pump. Background Art

[0002] For energy storage temperature control units, water pumps are the moving parts with the longest running time. They need to keep running in cooling, heating, self-circulation and other modes. Their lifespan is the key to the lifespan of the temperature control unit. Currently, water pumps used in temperature control units mainly include industrial centrifugal pumps and shielded pumps. Compared with industrial centrifugal pumps, shielded pumps have a longer lifespan due to the lack of mechanical seals. At the same time, they have the advantages of small size and low cost. They are increasingly used in the field of energy storage temperature control. At present, the lifespan of shielded pumps is basically 20,000 to 40,000 hours. Estimated based on 20 hours of operation per day, the corresponding lifespan of the temperature control unit is about 2.3 to 5.5 years, which is difficult to meet the 10-year lifespan requirement of the energy storage system. Utility Model Content

[0003] The purpose of the utility model includes, for example, providing a shielded pump radial bearing, a shielded pump bearing assembly and a shielded pump, which can improve the problem that the service life of the shielded pump radial bearing is difficult to meet the requirements of the energy storage system.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] An embodiment of the utility model provides a shielded pump radial bearing, wherein the inner surface of the radial bearing is provided with a plurality of first spiral grooves with the same rotation direction at intervals along the circumferential direction; each of the first spiral grooves surrounds the center line of the radial bearing and is arranged in an axial spiral along the radial bearing, and each of the first spiral grooves connects the two ends of the radial bearing.

[0006] In addition, the shielded pump radial bearing provided in the embodiment of the utility model may also have the following additional technical features:

[0007] Optionally, transition fillets are provided between the two side edges of each of the first spiral grooves and the inner surface of the radial bearing.

[0008] Optionally, the helix angle of the first spiral groove ranges from 3° to 87° or from -87° to -3°.

[0009] Optionally, the number of the first spiral grooves is 1-6.

[0010] An embodiment of the utility model also provides a shielded pump bearing assembly, which also includes a thrust bearing and a shielded pump radial bearing. The thrust bearing and the radial bearing are arranged side by side, and one of the end faces of the thrust bearing and the radial bearing that are close to each other is selectively provided with a plurality of second spiral grooves distributed at intervals along the circumferential direction, and the second spiral grooves are arranged through the thrust bearing and the radial bearing in the thickness direction.

[0011] Optionally, when the radial bearing is provided with a plurality of second spiral grooves, the plurality of second spiral grooves are respectively connected to one end of the plurality of first spiral grooves.

[0012] Optionally, the hand direction of the second spiral groove is the same as the hand direction of the first spiral groove.

[0013] Optionally, the width of the second spiral groove is greater than the width of the first spiral groove.

[0014] An embodiment of the utility model further provides a shielded pump, which includes an impeller, a pump casing, a motor casing and a shielded pump bearing assembly; the pump casing is connected to the motor casing, and the impeller and the shielded pump radial bearing are arranged in the motor casing.

[0015] Optionally, the rotation direction of the first spiral groove is consistent with the rotation direction of the impeller.

[0016] The beneficial effects of the shielded pump radial bearing, shielded pump bearing assembly and shielded pump of the embodiment of the utility model include, for example:

[0017] A shielded pump radial bearing, wherein the inner surface of the radial bearing is provided with a plurality of first spiral grooves with the same rotation direction at intervals along the circumferential direction; each first spiral groove surrounds the center line of the radial bearing and is arranged in an axial spiral along the radial bearing, and each first spiral groove connects the two ends of the radial bearing.

[0018] By arranging the first spiral groove on the radial bearing, the local liquid film flow velocity is increased, which is beneficial to the heat dissipation of the rotor and the bearing friction surface on the one hand; on the other hand, it can effectively remove particulate pollutants and prevent damage to the bearing and the rotor. Since the impurity transport and heat dissipation effects are enhanced, the service life can be significantly improved.

[0019] The canned pump bearing assembly and the canned pump, including the above-mentioned canned pump radial bearing, can significantly improve its service life due to the enhanced impurity transport and heat dissipation effects, thereby improving the problem that the service life of the canned pump radial bearing is difficult to meet the requirements of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the overall structure of the canned motor pump provided in this embodiment;

[0022] Figure 2 A schematic diagram of the internal structure of the canned motor pump provided in this embodiment;

[0023] Figure 3 A schematic diagram of the flow direction of the working medium in the canned motor pump provided in this embodiment;

[0024] Figure 4 A schematic diagram of the structure of the shielded pump radial bearing provided in this embodiment with a fillet transition;

[0025] Figure 5 A schematic structural diagram of a left-handed first spiral groove of a radial bearing of a canned motor pump provided in this embodiment;

[0026] Figure 6 A schematic structural diagram of a right-handed first spiral groove of a radial bearing of a shielded pump provided in this embodiment;

[0027] Figure 7 A schematic structural diagram of a second spiral groove of a radial bearing of a canned motor pump provided in this embodiment;

[0028] Figure 8 A side view of a shielded pump radial bearing provided in this embodiment with a second spiral groove.

[0029] Icons: 1-pump housing; 2-motor housing; 3-stator assembly; 4-rotor assembly; 5-shielding sleeve; 6-terminal socket; 7-rear sealing ring; 8-rear end cover; 9-rear cover plate; 10-impeller; 11-locking nut; 12-front sealing ring; 13-front cover plate; 14-front shaft sleeve; 15-front radial bearing; 16-front thrust bearing; 17-front protective sleeve; 18-rear protective sleeve; 19-rear thrust bearing; 20-rear shaft sleeve; 21-rear radial bearing; 30-radial bearing; 31-first spiral groove; 32-second spiral groove; 33-fillet. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present utility model, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present utility model.

[0034] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0035] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0036] Combine the following Figures 1 to 8 The shielded pump radial bearing provided in this embodiment is described in detail.

[0037] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 An embodiment of the utility model provides a shielded pump radial bearing, and the inner surface of the radial bearing 30 is provided with a plurality of first spiral grooves 31 with the same rotation direction at intervals along the circumferential direction; each first spiral groove 31 surrounds the center line of the radial bearing 30 and is spirally arranged along the axial direction of the radial bearing 30, and each first spiral groove 31 connects the two ends of the radial bearing 30.

[0038] “The first spiral groove 31 surrounds the center line of the radial bearing 30 and is spirally arranged along the axial direction of the radial bearing 30” means that the first spiral groove 31 surrounds the center line of the radial bearing 30 and extends along the axial direction of the radial bearing 30, that is, the pitch of the first spiral groove 31 is formed in sequence along the axial direction of the radial bearing 30. Thus, both ends of the first spiral groove 31 pass through both ends of the radial bearing 30.

[0039] Along the inlet direction of the working medium in the motor housing 2, radial bearings 30 are arranged at both ends, namely the front radial bearing 15 and the rear radial bearing 21. The first spiral groove 31 passes through both ends of the radial bearing 30. The working medium enters from one end of the water pump impeller 10, and then passes through the first spiral groove 31 of the front radial bearing 15 and the first spiral groove 31 of the rear radial bearing 21 in sequence, and flows to both ends of the front radial bearing 15 and the rear radial bearing 21 through the first spiral groove 31.

[0040] A first spiral groove 31 is provided on the inner surface of the radial bearing 30. When the working medium flows through the first spiral groove 31, the local liquid film flow rate can be increased, and impurities in the bearing gap can be quickly transported to avoid damage to the bearing. At the same time, due to the increase in flow rate, the heat generated by the friction between the radial bearing 30 and the rotor can be taken away more quickly, which is beneficial to the life of the bearing and the rotor. The spiral directions of multiple first spiral grooves 31 are consistent, which can ensure smooth flow of the working medium.

[0041] Reference Figure 4 In this embodiment, transition fillets 33 are provided between the two side edges of each first spiral groove 31 and the inner surface of the radial bearing 30. The first spiral groove 31 has two side edges that are opposite to each other along the circumferential direction, and they smoothly transition with the inner circumferential surface of the radial bearing 30, respectively, and adopt an arc surface transition, specifically, the transition with fillets 33 is conducive to the aggregation of particles in the first spiral groove 31, which is conducive to extending the life of the bearing.

[0042] Reference Figure 4 In this embodiment, the helix angle of the first spiral groove 31 ranges from 3° to 87° or from -87° to -3°.

[0043] Reference Figures 4 to 8 In this embodiment, the number of the first spiral grooves 31 is 1-6. The first spiral grooves 31 can be provided with one, two, three, four, five or six. It can take into account the water film dynamic pressure effect and the sewage discharge effect, while considering the feasibility of processing. Specifically, the spacing between two adjacent first spiral grooves 31 is equal.

[0044] Reference Figure 2 , Figure 3 , Figure 7 and Figure 8The embodiment of the utility model also provides a shielded pump bearing assembly, which also includes a thrust bearing and a shielded pump radial bearing. The thrust bearing and the radial bearing 30 are arranged side by side. One of the end faces of the thrust bearing and the radial bearing 30 that are close to each other is selectively provided with a plurality of second spiral grooves 32 distributed at intervals along the circumferential direction. The second spiral grooves 32 are arranged through the thickness direction of the thrust bearing and the radial bearing 30.

[0045] A thrust bearing is arranged at the rear side of the front radial bearing 15, named as the front thrust bearing 16, and a thrust bearing is arranged at the front side of the rear radial bearing 21, named as the rear thrust bearing 19. A second spiral groove 32 is arranged at one end of the radial bearing 30 close to the thrust bearing, or a second spiral groove 32 is arranged at one end of the thrust bearing close to the contact end of the radial bearing 30, or a second spiral groove 32 is arranged at one end of the radial bearing 30 close to the thrust bearing and at one end of the thrust bearing close to the contact end of the radial bearing 30, so that the working medium flowing between the radial bearing 30 and the thrust bearing can flow out through the second spiral groove 32, which is conducive to the release of friction heat between the thrust bearing and the radial bearing 30, and the removal of impurities.

[0046] Reference Figure 7 and Figure 8 In this embodiment, when the radial bearing 30 is provided with a plurality of second spiral grooves 32, the plurality of second spiral grooves 32 are respectively connected to one end of the plurality of first spiral grooves 31. The plurality of second spiral grooves 32 are connected to the first spiral grooves 31, so that the outflow of impurities and continuous heat dissipation can be realized continuously.

[0047] Reference Figure 7 and Figure 8 In this embodiment, the rotation direction of the second spiral groove 32 is the same as that of the first spiral groove 31. That is, the first spiral groove 31 is left-handed, and the second spiral groove 32 is also left-handed, connected with the first spiral groove 31, and is formed by extending along the end surface of the rotation direction of the first spiral groove 31. The rotation direction of the second spiral groove 32 is the same as the spiral direction of the first spiral groove 31, and the flow is smoother.

[0048] Reference Figure 7 and Figure 8 In this embodiment, the width of the second spiral groove 32 is greater than the width of the first spiral groove 31. At the front end of the water pump, that is, Figure 2 At the left end of the water pump, the working fluid flows from the first spiral groove 31 to the second spiral groove 32. At the rear end of the water pump, that is, Figure 2 At the right end of the water pump, the working medium flows from the second spiral groove 32 to the first spiral groove 31 . The width of the second spiral groove 32 is greater than that of the first spiral groove 31 , which helps to improve the fluidity of the working medium.

[0049] Reference Figure 2 , Figure 3 , Figure 5 and Figure 6 The embodiment of the utility model further provides a shielded pump, which includes an impeller 10, a pump housing 1, a motor housing 2, and a shielded pump bearing assembly; the pump housing 1 is connected to the motor housing 2, and the impeller 10 and the shielded pump radial bearing are arranged in the motor housing 2. The radial bearing 30 and the thrust bearing are arranged in the shielded pump, which can improve the problem that the service life of the shielded pump radial bearing is difficult to meet the requirements of the energy storage system.

[0050] In this embodiment, the rotation direction of the first spiral groove 31 is consistent with the rotation direction of the impeller 10. In order to ensure that the fluid in the first spiral groove 31 is consistent with the flow direction of the liquid film, the rotation direction of the first spiral groove 31 must be correct. From the water pump inlet direction, the rotation direction of the first spiral groove 31 on the front radial bearing 15 needs to be consistent with the rotation direction of the impeller 10. From the water pump inlet direction, if the water pump impeller 10 rotates counterclockwise, the first spiral groove 31 on the front radial bearing 15 and the rear radial bearing 21 is a left spiral groove. If the water pump impeller 10 rotates clockwise, the first spiral groove 31 on the front radial bearing 15 and the rear radial bearing 21 is a right spiral groove. For example, 5 is left-handed, as Figure 6 It is right-handed.

[0051] Reference Figure 2 and Figure 3 A rotor assembly 4 and a stator assembly 3 are arranged in the motor housing 2, a shielding sleeve 5 is arranged between the rotor assembly 4 and the stator assembly 3, a terminal block 6 is fixed at the rear end of the motor housing 2, an impeller 10 is coaxially fixed with the front end of the rotor assembly 4 through a locking nut 11, a front sealing ring 12 is arranged between the impeller 10 and the pump housing 1, a front shaft sleeve 14 is arranged at the front end of the rotor assembly 4, a front radial bearing 15 and a front thrust bearing 16 are arranged in the front shaft sleeve 14, a front protective sleeve 17 is arranged on the rear side of the front thrust bearing 16, and a front cover plate 13 is arranged on the front side of the front radial bearing 15; a rear shaft sleeve 20 and a rear radial bearing 21 are arranged at the rear end of the rotor assembly 4, a rear thrust bearing 19 is arranged on the front side of the rear radial bearing 21, and a rear protective sleeve 18 is arranged on the front side of the rear thrust bearing 19, a rear cover plate 9 and a rear end cover 8 are arranged at the rear end of the motor housing 2, and a rear sealing ring 7 is arranged between the rear cover plate 9 and the rear end cover 8.

[0052] According to a shielded pump radial bearing provided in this embodiment, the working principle of the shielded pump radial bearing is: bearings are the main bottleneck of shielded pump life at present, and the dynamic pressure water film formed by conventional bearings has a low speed and poor transportation capacity. The shielded pump radial bearing provided in this embodiment increases the local liquid film flow rate by grooves on the bearing.

[0053] The generatrix of the first spiral groove 31 is a cylindrical spiral line, and the spiral angle range is 3°~87° or -87°~-3°, which can achieve the optimal effect at different design speeds. The number of the first spiral grooves 31 is 1-6, which can achieve a balance between the sewage discharge effect and manufacturability, and the number of the second spiral grooves 32 corresponds to the number of the first spiral grooves 31. The first spiral groove 31 and the inner circular surface of the radial bearing 30 are provided with a fillet 33 transition, which is more conducive to the sewage discharge effect. The rotation direction of the first spiral groove 31 matches the rotation speed direction of the water pump impeller 10 to ensure that the running direction of the water film inside and outside the groove is consistent, which is conducive to the transportation of impurities. The thrust bearing surface of the radial bearing 30, that is, the end face close to the thrust bearing, is engraved with a second spiral groove 32 to enhance the heat dissipation effect of the friction surface of the thrust bearing. The shielded pump using this spiral groove bearing can significantly improve its service life due to the enhanced impurity transportation and heat dissipation effects.

[0054] The working fluid flows in from the inlet of the pump casing 1, is pressurized by the centrifugal force of the impeller 10, and then flows out from the outlet of the pump casing 1. After flowing out of the impeller 10, the working fluid passes through the cavity between the impeller 10 and the front cover plate 13, enters the gap between the front bearing sleeve and the front radial bearing 15, lubricates the bearings and forms a pressurized liquid film to support the rotation of the rotor assembly 4, and then flows through the gap between the front radial bearing 15 and the front thrust bearing 16 to lubricate the thrust surface. The working fluid enters the rear thrust bearing 19 and the rear radial bearing 21 through the gap between the shielding sleeve 5 and the rotor assembly 4, and then returns to the inlet of the impeller 10 through the center hole channel of the rotor assembly 4, thereby forming a cycle. When the working fluid flows through the radial bearing 30 and the thrust bearing, the first spiral groove 31 is engraved on the bearing surface, which can increase the local liquid film flow rate, quickly transport impurities in the bearing gap, and avoid damage to the bearing. At the same time, due to the increase in flow rate, the heat generated by the friction between the rotor assembly 4 and the radial bearing 30, and between the radial bearing 30 and the thrust bearing can be taken away more quickly, which is beneficial to extending the life of the bearing and the rotor.

[0055] The shielded pump radial bearing provided in this embodiment has at least the following advantages:

[0056] By setting the first spiral groove 31 on the radial bearing 30, the local liquid film flow rate is increased, which is beneficial to the heat dissipation of the rotor and the bearing friction surface on the one hand; on the other hand, it can effectively remove particulate pollutants and prevent damage to the bearing and the rotor. Due to the enhanced impurity transport and heat dissipation effect, the life span can be significantly improved. Tests have proved that after adopting this technology, the life of the shielded pump can reach 60,000 to 80,000 hours, corresponding to the life of the temperature control unit of 8.2 to 11.0 years, which basically meets the ten-year life requirement of the energy storage system.

[0057] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A shielded pump radial bearing, characterized in that: The inner surface of the radial bearing (30) is provided with a plurality of first spiral grooves (31) with the same rotation direction at intervals along the circumferential direction; each of the first spiral grooves (31) surrounds the center line of the radial bearing (30) and is spirally arranged along the axial direction of the radial bearing (30); each of the first spiral grooves (31) is connected to both ends of the radial bearing (30).

2. The shielded pump radial bearing according to claim 1, characterized in that: Transition fillets (33) are provided between the two side edges of each of the first spiral grooves (31) and the inner surface of the radial bearing (30).

3. The shielded pump radial bearing according to claim 1, characterized in that: The helical angle of the first helical groove (31) ranges from 3° to 87° or from -87° to -3°.

4. The shielded pump radial bearing according to claim 1, characterized in that: The number of the first spiral grooves (31) is 1-6.

5. A canned motor pump bearing assembly, characterized in that: The shielded pump bearing assembly also includes a thrust bearing and a shielded pump radial bearing according to any one of claims 1 to 4, wherein the thrust bearing and the radial bearing (30) are arranged side by side, and one of the end surfaces of the thrust bearing and the radial bearing (30) close to each other is selectively provided with a plurality of second spiral grooves (32) distributed at intervals along the circumferential direction, and the second spiral grooves (32) are arranged through the thrust bearing and the radial bearing (30) in the thickness direction.

6. The shielded pump bearing assembly according to claim 5, characterized in that: When the radial bearing (30) is provided with a plurality of second spiral grooves (32), the plurality of second spiral grooves (32) are respectively connected to one end of the plurality of first spiral grooves (31).

7. The shielded pump bearing assembly according to claim 6, characterized in that: The hand direction of the second spiral groove (32) is the same as the hand direction of the first spiral groove (31).

8. The shielded pump bearing assembly according to claim 7, characterized in that: The width of the second spiral groove (32) is greater than the width of the first spiral groove (31).

9. A canned motor pump, characterized in that: The shielded pump comprises an impeller (10), a pump casing (1), a motor casing (2), and a shielded pump bearing assembly according to any one of claims 5 to 8; the pump casing (1) is connected to the motor casing (2), and the impeller (10) and the shielded pump radial bearing are arranged in the motor casing (2).

10. The canned motor pump according to claim 9, characterized in that: The rotation direction of the first spiral groove (31) is consistent with the rotation direction of the impeller (10).

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