Self-cooling liquid cooling pump and liquid cooling system

Abstract

The utility model relates to a self-cooling liquid cooling pump and a liquid cooling system. The self-cooling liquid cooling pump comprises a pump body assembly and a motor assembly. The pump body assembly comprises a pump shell and an impeller, the motor assembly comprises a machine shell and a rotor, the impeller is connected to the rotor, and the machine shell is connected with the pump shell in a sealed mode. The head end of the machine shell is connected with a bearing gland, a gap is reserved between the impeller and the bearing gland, and the gap is communicated with a shell cavity of the machine shell. A liquid cooling medium conveyed by the pump can be introduced to cool the motor, and long-term stable operation of the liquid cooling pump and the liquid cooling system is guaranteed in a self-cooling mode.

Description

Technical Field

[0001] This application relates to the technical field of pumps, and more particularly, to a self-cooling liquid-cooled pump and a liquid-cooling system. Background Art

[0002] For the new generation of data center waterless liquid-cooling system technology, a fluorinated liquid is used to replace the traditional water-cooling form for cooling. Due to the volatile characteristics of the fluorinated liquid, combined with the characteristics of the long service life, high system efficiency, and small cabinet space of the liquid-cooling system, higher requirements are imposed on the sealing performance, reliability, space size, and energy-saving performance of the pump in the waterless coolant cooling unit.

[0003] At the same time, since the liquid-cooling pump needs to operate online for a long time following the liquid-cooling system, heat dissipation and cooling of the liquid-cooling pump are required. The conventional cooling form generally adopts the water-cooling form. However, based on the transportation of the fluorinated liquid and the small volume of the liquid-cooling pump, it is difficult to ensure the complete enclosure of the water-cooling cavity and the medium cavity, and it is easy to cause the leakage of the water-cooling medium into the fluorinated liquid. Therefore, it is necessary to consider providing a relatively stable and reliable self-cooling liquid-cooled pump to maintain the long-term heat dissipation operation of the liquid-cooling pump. Summary of the Utility Model

[0004] The purpose of this application is to provide a self-cooling liquid-cooled pump and a liquid-cooling system, which can use the liquid-cooling medium transported by the pump itself to cool the motor, and ensure the long-term stable operation of the liquid-cooled pump and the liquid-cooling system in a self-cooling form.

[0005] To achieve the above purpose, in the first aspect, the present utility model provides a self-cooling liquid-cooled pump, including: a pump body assembly and a motor assembly;

[0006] The pump body assembly includes a pump housing and an impeller, the motor assembly includes a motor housing and a rotor, the impeller is connected to the rotor, and the motor housing is hermetically connected to the pump housing;

[0007] A bearing gland is connected to the head end of the motor housing, a gap is left between the impeller and the bearing gland, and the gap communicates with the cavity of the motor housing.

[0008] In an alternative embodiment, a gap is left between the motor housing and the tail end of the rotor;

[0009] The rotor is a hollow structure, including a liquid return flow channel at the axis center, and the liquid return flow channel runs through the rotor from front to back.

[0010] In an alternative embodiment, a rotor flow channel is provided at the head end of the rotor, the rotor flow channel includes multiple channels, and each rotor flow channel communicates with the liquid return flow channel.

[0011] In an alternative embodiment, multiple rotor channels are disposed in the same radial direction of the rotor and are evenly spaced in the circumferential direction of the rotor.

[0012] In an alternative embodiment, an inducer is installed outside the head end of the rotor. A liquid return hole is provided at the root of the inducer, and the position of the liquid return hole corresponds to that of the rotor channel.

[0013] In an alternative embodiment, a sealing ring is provided at the connection portion between the casing and the pump casing. The sealing ring includes at least two channels and is arranged at intervals in the axial direction.

[0014] In an alternative embodiment, the rotor includes a permanent magnet portion located inside the casing, and there is a gap between the permanent magnet portion and the cavity of the casing;

[0015] A head end bearing is installed between the permanent magnet portion and the impeller, and the head end bearing is press-fitted and fixed by the bearing gland;

[0016] Adjusting pads are respectively installed between the head end bearing and the impeller, and between the permanent magnet portion and the head end bearing. The adjusting pads are sleeved on the rotor.

[0017] In an alternative embodiment, a tail end bearing is further installed on the rotor. The tail end bearing is limited and fixed by a fastening nut located at the tail end of the rotor. A gasket is installed between the fastening nut and the tail end bearing, and the tail end bearing presses and fixes the permanent magnet portion in the axial direction.

[0018] In an alternative embodiment, the head end bearing includes a pair of angular contact bearings, and the tail end bearing includes a deep groove ball bearing;

[0019] Both the head end bearing and the tail end bearing are ceramic bearings.

[0020] In a second aspect, the present utility model provides a liquid cooling system, including the self-cooling liquid pump according to any one of the foregoing embodiments.

[0021] By providing a gap between the impeller and the bearing gland, and combining with the fact that the gap communicates with the cavity of the casing, the fluorinated liquid medium conveyed by the liquid cooling pump can enter the casing and cool the internal rotor of the motor, so as to realize the cooling of the liquid cooling pump in a self-cooling manner.

[0022] In the form of self-cooling, it can effectively avoid the leakage of external water-cooling medium in the liquid cooling pump, reduce the influence of the leaked material on the conveyed medium, and through self-cooling with the fluorinated liquid medium conveyed by itself, it can maintain the long-term heat dissipation of the liquid cooling pump and enhance the stability of the operation of the liquid cooling pump.

[0023] Other features and advantages of the present application will be described in detail in the following detailed implementation section. Description of the Drawings

[0024] To more clearly illustrate the technical solutions of the embodiments of the present application, 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 present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic diagram of the internal structure of the self-cooling liquid pump in the present application;

[0026] Figure 2 It is a schematic diagram of the cooperation relationship between the impeller, inducer, and rotor in the present application.

[0027] Icon:

[0028] 1 - Pump body assembly; 11 - Pump casing; 12 - Impeller;

[0029] 2 - Motor assembly; 21 - Motor housing; 22 - Rotor; 23 - Return liquid flow channel; 24 - Rotor flow channel; 25 - Permanent magnet part;

[0030] 3 - Bearing gland;

[0031] 4 - Inducer; 41 - Return liquid hole;

[0032] 5 - Sealing ring;

[0033] 6 - Head-end bearing;

[0034] 7 - Adjusting pad;

[0035] 8 - Tail-end bearing;

[0036] 9 - Locknut;

[0037] 10 - Gasket. Detailed Implementation Manner

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Generally, the components of the embodiments of the present application described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0039] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "inner" and "outer" is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, terms such as "first" and "second" are only used for differential description and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present application, it should also be noted that unless otherwise clearly specified and defined, the terms "set" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0041] The self-cooling liquid-cooled pump in the present application is mainly applied in the anhydrous liquid-cooling system of the data center and is involved in the transportation of the fluorinated liquid refrigerant medium.

[0042] Specifically, by changing the cooling form of the liquid-cooled pump, the external water-cooling form is optimized into a self-cooling form through its own transported medium, improving the heat dissipation effect of the liquid-cooled pump, and being able to meet the working conditions requirements for the long-term stable operation of the liquid-cooling system and the liquid-cooled pump.

[0043] See Figure 1 - Figure 2 , the self-cooling liquid-cooled pump in the present application, the main functional structure includes a pump body assembly 1 and a motor assembly 2.

[0044] The pump body assembly 1 is specifically used for the pressurized transportation of the fluorinated liquid refrigerant medium, and the motor assembly 2 is specifically used to drive the impeller 12 in the pump body assembly 1 to rotate, and then conduct the pressurized export of the liquid material.

[0045] Furthermore, the pump body assembly 1 includes a pump housing 11 and an impeller 12. The impeller 12 is installed in the pump housing 11 and is mainly involved in the suction of the transported medium and the export after pressurization.

[0046] The motor assembly 2 includes a housing 21, a stator, and a rotor 22. The impeller 12 is connected to the rotor 22 and can rotate synchronously with the rotor 22.

[0047] Based on the cooling of the motor through its own transported medium in the present application, the housing 21 of the motor is hermetically connected to the pump housing 11, so that the internal space of the whole liquid-cooled pump is isolated and sealed from the outside world, realizing zero leakage of the fluorinated liquid medium, which is conducive to enabling the transported medium to enter the housing 21 to cool the motor assembly 2.

[0048] The head end of the housing 21 is connected with a bearing gland 3, which is mainly used for press-fitting and fixing the bearings inside the housing 21. At the same time, considering the gap left between the impeller 12 and the bearing gland 3 and the communication between the gap and the housing cavity of the housing 21, the medium inside the pump housing 11 can enter the housing cavity of the housing 21 through the above-mentioned gap at the impeller 12 part, thus facilitating self-cooling through the self-transported medium.

[0049] In one specific embodiment, the self-cooling in the present application is essentially the self-circulation cooling of the transported medium inside the liquid-cooled pump.

[0050] Specifically, after the transported medium enters the housing cavity of the housing 21, in order to be able to circulate back to the impeller 12 part, a gap is left at the tail end of the rotor 22 in the housing 21, forming a tail gap for the circulated return of the transported medium.

[0051] Furthermore, the transported medium specifically circulates back to the impeller 12 part near the head end through the inside of the rotor 22. The rotor 22 in this embodiment is a hollow structure, including a liquid return flow channel 23 located at the axis center, and the transported medium specifically returns through the liquid return flow channel 23.

[0052] Preferably, the liquid return flow channel 23 runs through in the axial direction of the rotor 22, enabling the transported medium cooled by the motor assembly 2 at the tail end to circulate back.

[0053] Considering the angle that is conducive to the medium circulating back to the head end of the rotor 22 flowing out of the rotor 22, the head end of the rotor 22 is provided with rotor flow channels 24. There are multiple rotor flow channels 24, and each rotor flow channel 24 communicates with the liquid return flow channel 23. Through this setting method, a dynamic flow of the transported medium circulating inside and outside the head and tail ends of the rotor 22 can be formed, effectively cooling the rotor 22 of the motor assembly 2 and the DC coil of the stator.

[0054] To ensure the stable outflow of the transported medium, multiple rotor flow channels 24 are arranged in the same radial direction of the rotor 22 and are evenly distributed in the circumferential direction of the rotor 22, enabling the medium to flow out evenly from the head end part during the flow process of the rotor 22.

[0055] An inducer 4 is installed outside the head end of the rotor 22. A liquid return hole 41 is provided at the root of the inducer 4, and the position of the liquid return hole 41 is opposite to that of the rotor flow channel 24. Specifically, the inducer 4 is threadedly connected to the outside of the head end of the rotor 22. After being screwed and fixed in place, the liquid return hole 41 at the root of the inducer 4 is opposite to the position of the rotor flow channel 24, and then the circulated cooling medium after absorbing heat and rising in temperature can be discharged successively through the liquid return flow channel 23, the rotor flow channel 24, and the liquid return hole 41.

[0056] In this embodiment, the inducer 4 participates in the cooling cycle of the self-cooling medium in the form of rotating synchronously with the impeller 12 and the rotor 22.

[0057] Based on the characteristics of the centrifugal pump, the inducer 4 and the impeller 12 located at the center have a certain suction force. After the conveying medium is pressurized by rotation, most of the conveying medium is discharged from the liquid outlet on the pump casing 11. A small part of the self-cooling medium after pressurization enters the casing 21 through the gap between the impeller 12 and the bearing gland 3. On the one hand, it cools the motor assembly 2, and on the other hand, it lubricates the bearings inside the casing 21. Since the inside of the casing 21 is a unified integral shell cavity, the pressure in the shell cavity is consistent. Combining the setting of the tail gap, and the connection relationship of the tail gap, the return liquid flow channel 23, the rotor flow channel 24, and the return liquid hole 41, based on the suction force of the inducer 4 and the impeller 12 parts, the self-cooling medium can be circulated back to the root of the inducer 4 through the above spatial structure, thus realizing the dynamic circulation flow of the self-cooling medium.

[0058] Since the self-cooling medium absorbs the heat generated by the motor in the cooling circulation loop and its own temperature rises, when it reaches the root of the inducer 4, it can, under the rotation of the inducer 4, carry out a sufficient heat exchange process with the sucked conveying medium, thereby maintaining the stability of the temperature inside the pump.

[0059] For the dynamic flow of the self-cooling medium in the internal circulation between the pump body assembly 1 and the motor assembly 2, in order to prevent the leakage of the fluorinated liquid, a sealing ring 5 is provided at the connection part between the casing 21 and the pump casing 11. The sealing ring 5 includes at least two channels and is arranged at intervals axially, which can form multiple seals, and ensures the reliable stability of the overall seal of the liquid-cooled pump with the structure of multiple static seals.

[0060] In another specific embodiment, the rotor 22 includes a permanent magnet part 25 located inside the casing 21, which rotates relative to the stator DC coil on the casing 21. There is a gap between the permanent magnet part 25 and the shell cavity of the casing 21, which can make the circulating self-cooling medium fill the gap, so that the heat generated by the motor assembly 2 can be timely exported in combination with the dynamic flow of the self-cooling medium.

[0061] A head-end bearing 6 is installed between the permanent magnet part 25 and the impeller 12, and the head-end bearing 6 is axially pressed and fixed by the bearing gland 3.

[0062] In order to ensure the stable press-fitting of the impeller 12, the head-end bearing 6, and the permanent magnet part 25, adjusting pads 7 are respectively installed between the head-end bearing 6 and the impeller 12, and between the permanent magnet part 25 and the head-end bearing 6. The adjusting pads 7 are sleeved on the outer side wall of the rotor 22 and are press-fitted with the inner ring of the head-end bearing 6 respectively, which can ensure the reliable stability of the synchronous rotation of the above different components.

[0063] A tail-end bearing 8 is also installed on the rotor 22. The tail-end bearing 8 is axially limited and fixedly installed by a fastening nut 9 located at the tail end of the rotor 22. A gasket 10 is installed between the fastening nut 9 and the tail-end bearing 8. The gasket 10 is press-fitted with the inner ring of the tail-end bearing 8, which can ensure the stable installation of the tail-end bearing 8.

[0064] Through the fastening nut 9 and the gasket 10, the permanent magnet part 25 can be axially pressed and fixed by the tail-end bearing 8, so that the rotor 22 and the auxiliary structures on the rotor 22 can be stably combined in sequence from front to back, ensuring the effective and reliable operation.

[0065] The head-end bearing 6 includes a pair of angular contact bearings, and the tail-end bearing 8 includes a deep groove ball bearing. Further, both the head-end bearing 6 and the tail-end bearing 8 are ceramic bearings. In the form of a hybrid ceramic rolling bearing, the extremely high reliability of the liquid cooling system operation can be guaranteed, and the problem that the bearing instability easily affects the service life in various working conditions of the liquid cooling system can be solved.

[0066] The present utility model also provides a liquid cooling system, including the above-mentioned self-cooling liquid cooling pump. Through the heat removal of the self-cooling medium and the lubrication effect on the bearing, the long-term stable and efficient operation of the liquid cooling system can be formed.

[0067] It should be noted that, without conflict, the features in the embodiments of this application can be combined with each other.

[0068] The above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A self-cooling liquid-cooled pump, characterized in that, Comprising: A pump body assembly and a motor assembly; The pump body assembly includes a pump housing and an impeller, the motor assembly includes a housing and a rotor, the impeller is connected to the rotor, and the housing is hermetically connected to the pump housing; A bearing gland is connected to the head end of the housing, a gap is left between the impeller and the bearing gland, and the gap communicates with the housing cavity of the housing.

2. The self-cooling liquid-cooled pump according to claim 1, wherein, A gap is left between the housing and the tail end of the rotor; The rotor is of a hollow structure and includes a liquid return flow channel located at the axis, and the liquid return flow channel penetrates through the rotor front and back.

3. The self-cooling liquid-cooled pump according to claim 2, wherein The head end of the rotor is provided with rotor flow channels, and there are multiple rotor flow channels, and each rotor flow channel communicates with the liquid return flow channel.

4. The self-cooling liquid-cooled pump according to claim 3, characterized in that, The multiple rotor flow channels are arranged in the same radial direction of the rotor and are evenly spaced in the circumferential direction of the rotor.

5. The self-cooling liquid-cooled pump according to claim 3, characterized in that An inducer is installed on the outer side of the head end of the rotor, a liquid return hole is provided at the root of the inducer, and the position of the liquid return hole is opposite to that of the rotor flow channel.

6. The self-cooling liquid-cooled pump according to any one of claims 1-5, characterized in that A sealing ring is provided at the connection part between the housing and the pump housing, the sealing ring includes at least two, and is arranged at intervals in the axial direction.

7. The self-cooling liquid-cooled pump according to claim 6, wherein The rotor includes a permanent magnet part located inside the housing, and there is a gap between the permanent magnet part and the housing cavity of the housing; A head end bearing is installed between the permanent magnet part and the impeller, and the head end bearing is press-fitted and fixed by the bearing gland; Adjusting pads are respectively installed between the head end bearing and the impeller, and between the permanent magnet part and the head end bearing, and the adjusting pads are sleeved on the rotor.

8. The self-cooling liquid-cooled pump according to claim 7, characterized in that, A tail end bearing is also installed on the rotor, the tail end bearing is limited and fixed by a fastening nut located at the tail end of the rotor, a gasket is installed between the fastening nut and the tail end bearing, and the tail end bearing presses and fixes the permanent magnet part in the axial direction.

9. The self-cooling liquid-cooled pump according to claim 8, wherein The head end bearing includes a pair of angular contact bearings, and the tail end bearing includes a deep groove ball bearing; Both the head end bearing and the tail end bearing are ceramic bearings.

10. A liquid cooling system, characterized in that, Including the self-cooling liquid-cooled pump according to any one of claims 1-9.

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