A server liquid cooling pump

Abstract

This invention provides a server liquid cooling pump, which has the advantages of self-heating using liquid medium, high pump reliability and long service life, self-balancing pump chamber pressure difference, and near-zero leakage risk. Its structure includes a pump casing, a stator-rotor assembly, and an impeller. The stator-rotor assembly is installed inside the pump casing and drives the impeller to rotate, causing the liquid medium to flow within the flow channel. A cooling channel is also provided inside the pump casing, communicating with the flow channel. The liquid medium can enter the cooling channel and immerse the stator-rotor assembly in the liquid medium, thereby dissipating heat from the stator-rotor assembly.

Description

Technical Field

[0001] This utility model relates to the field of liquid cooling pump technology, specifically a server liquid cooling pump. Background Technology

[0002] With the exponential growth of computing power density, traditional air cooling has approached its physical limits, and liquid cooling systems have become an inevitable choice for high-density servers. Among them, the liquid cooling pump is a core power component, and its performance directly affects whether the server can work normally.

[0003] The structure of the server liquid cooling pump includes a pump casing, a stator installed inside the pump casing, a rotor assembly, and an impeller. After the liquid cooling pump is powered on, the rotor assembly of its motor structure can rotate relative to the stator, thereby causing the impeller to rotate. The impeller drives the medium to flow, thereby removing heat from the relevant locations inside the server.

[0004] However, because the impeller needs to be driven by a motor, the heat generated by the motor and controller is conducted into the server control cabinet, causing the cabinet temperature to rise and affecting the server. To reduce the impact of the liquid-cooled pump's self-heating, traditional methods involve adding heat sinks. This not only has limited cooling effect (high temperatures shorten the motor's lifespan) but also increases the size of the liquid-cooled pump, contradicting the trend towards compact servers. Existing technologies for reducing the heat generated by the liquid-cooled pump, such as the self-cooling water pump disclosed in CN116221138A, involve a self-cooling component installed outside the motor structure. Some of the liquid agitated by the pump impeller enters the self-cooling component and then returns to the pump body, thus absorbing the heat generated by the motor. While this method reduces the impact of the motor's heat on the external environment, the additional self-cooling component still significantly increases the pump's size. Utility Model Content

[0005] To address the issues of existing liquid pumps having self-heating issues that affect their lifespan or taking up too much space, this invention provides a server liquid cooling pump that can effectively reduce the impact of self-heating on the server. At the same time, compared with other water pumps that have added heat dissipation and cooling components, its size change is not significant.

[0006] The technical solution is as follows: a server liquid cooling pump includes a pump casing, a stator and rotor assembly, and an impeller. The stator and rotor assembly is installed inside the pump casing and is used to drive the impeller to rotate and cause the liquid medium to flow in the flow channel. The pump casing is further provided with a cooling channel, which is connected to the flow channel. The liquid medium can enter the cooling channel and immerse the stator and rotor assembly in the liquid medium, thereby dissipating heat from the stator and rotor assembly. The motor and controller heating components are effectively temperature controlled, effectively extending the pump's lifespan.

[0007] Furthermore, the stator-rotor assembly includes a stator mechanism, which includes a stator housing and a stator. The stator is located inside the stator housing, and there is a certain gap between the stator housing and the pump housing to form the cooling channel.

[0008] Furthermore, the outer surface of the stator housing is provided with partition strips, which are distributed around the stator housing to divide the cooling channel between the stator housing and the pump housing into uniform guide grooves;

[0009] The stator housing is formed by plastic sealing of the stator or by assembling a partition on the outer periphery, a front plate and a rear plate at the front and rear ends, and an isolation sleeve on the inner side. The outer surface of the partition is provided with the flow guide groove. The rear plate is connected to a connecting pipe. The isolation sleeve is sealed to the bottom of the front plate and the bottom of the rear plate through O-rings. After the stator is placed into the stator housing, the inside of the stator housing is filled with glue.

[0010] Furthermore, the stator-rotor assembly also includes a rotor mechanism, which includes a rotor housing and a rotor. The rotor mechanism is located inside the stator mechanism, and there is a certain gap between the front and rear ends of the rotor mechanism and between the rotor mechanism and the stator mechanism to form the cooling channel.

[0011] Furthermore, the stator-rotor assembly also includes a rotor mechanism and a main shaft mechanism. The rotor mechanism is located inside the stator mechanism, and a cooling channel for the flow of liquid medium is provided between the main shaft mechanism and the rotor mechanism.

[0012] Furthermore, the spindle mechanism includes a spindle and a bearing, the rotor mechanism is mounted on the spindle via the bearing and is able to rotate around the spindle, and the liquid medium flows between the spindle and the bearing through a pressure difference for heat dissipation and lubrication of the bearing.

[0013] Furthermore, the liquid medium flows into the pump casing through the cooling channel inlet and flows sequentially between the stator housing and the pump casing, between the front and rear ends of the rotor mechanism and the stator mechanism, and between the rotor mechanism and the main shaft mechanism before being discharged through the cooling channel outlet. The impeller forms a low-pressure zone and a high-pressure zone within the flow channel by rotating. The cooling channel outlet is located in the low-pressure zone, and the cooling channel inlet is located in the high-pressure zone.

[0014] Furthermore, the liquid-cooled pump also includes a controller assembly, which includes a control board located in the rear cavity of the pump housing and connected to the stator and rotor assembly via a wiring harness. The wiring harness is isolated from the liquid medium via a connecting pipe. The rear cavity of the pump housing is formed by a heat-conducting end cap, one side of which is in contact with the liquid medium.

[0015] Furthermore, the pump casing is only open at the connection point with the flow channel housing, and this opening is sealed to the flow channel housing through a sealing structure.

[0016] Beneficial effects: By allowing the liquid medium to directly enter the pump casing to dissipate heat from the stator and rotor assembly, the impact of the liquid-cooled pump's self-heating on the server can be effectively reduced. At the same time, compared with other water pumps that have added heat dissipation and cooling components, there is no need to install additional large-volume heat dissipation components, resulting in a small volume change and effective utilization of the server's internal space. This solution not only introduces the liquid medium into the pump casing, but also immerses the stator and rotor assembly in the liquid medium, thereby reducing the heat leakage to near zero.

[0017] In addition, this solution has the following advantages: 1. By having the liquid medium pass through the bearing to force lubrication, friction is reduced and the pump service life is increased; 2. The cooling channel outlet is located at the impeller, which can reduce cavitation; 3. By feeding the liquid medium in the high-pressure area back to the low-pressure area, a reverse force is formed to counteract the axial thrust, so that the impeller is balanced by force; 4. The pump casing has only one seal, so the risk of leakage is low. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0019] Figure 2 for Figure 1 Schematic diagram of sectional view along direction AA;

[0020] Figure 3 This is a structural schematic diagram of the rotor mechanism, impeller, and bearings.

[0021] Figure 4 This is a schematic diagram of the stator mechanism;

[0022] Figure 5 This is a schematic diagram showing the location of the cooling channel inlet;

[0023] Figure 6 This is a schematic diagram of a sliding bearing structure. Detailed Implementation

[0024] like Figure 1 , Figure 2The server liquid cooling pump shown includes a pump casing 1, a stator and rotor assembly, and an impeller 3. The stator and rotor assembly is installed inside the pump casing 1 and is used to drive the impeller 3 to rotate and to make the liquid medium flow in the flow channel. The liquid medium can be a heat-conducting liquid such as fluorinated liquid, ethylene glycol, mineral oil, or deionized water. The pump casing 1 is also provided with a cooling channel. Figure 2 (Shaded area) The cooling channel is connected to the flow channel, allowing the liquid medium to enter the cooling channel and immerse the stator and rotor assembly in the liquid medium, thereby dissipating heat from the stator and rotor assembly.

[0025] Specifically, in combination Figure 2 , Figure 4 As shown, the stator and rotor assembly includes a stator mechanism 21, which includes a stator housing and a stator (not shown in the figure). The stator is located inside the stator housing to isolate it from the liquid medium. There is a certain gap between the stator housing and the pump housing 1 to form a stator cooling channel 41.

[0026] Specifically, the stator housing is formed by a stator plastic-coating seal, and its material may include PPS and corrugated fiber. The stator housing may also include a partition 211 on the outer periphery, a front side plate 212 and a rear side plate 213 at the front and rear ends, and an isolation sleeve 214 on the inner side. The outer surface of the partition 211 is provided with a guide groove formed by partition strips 215. The partition strips 215 are spirally distributed around the stator housing to divide the stator cooling channel 41 between the stator housing and the pump housing 1 into a spiral guide groove (of course, it is not limited to a spiral shape, and can also be distributed in other forms). Multiple spiral cooling channels can be arranged in parallel to increase the flow of liquid medium between the stator housing and the pump housing 1. The flow rate is high enough to ensure that the heat of the stator and rotor assembly is difficult to transfer to the pump casing 1. The front plate 212 is connected to the flange 216 (or there may be no flange), and the rear plate 213 is connected to the connecting pipe 217. The isolation sleeve 214 is sealed to the bottom of the front plate 212 and the bottom of the rear plate 213 through the O-ring seal 218. After the stator is placed into the stator housing, the inside of the stator housing is filled with glue. The stator seal can be directly injection molded using PPS injection molding process. The above-mentioned partition plate 211, front plate 212 and rear plate 213 can all be made of stainless steel or PPS material. However, in order to avoid the generation of eddy currents, the isolation sleeve 214 needs to be made of non-metallic materials such as PPS material or carbon fiber.

[0027] Combination Figure 2 , Figure 3As shown, the stator-rotor assembly also includes a rotor mechanism 22, which includes a rotor housing 221 and a rotor (not shown in the figure). The rotor is located inside the rotor housing 221 to isolate it from the liquid medium. The rotor mechanism 22 is located inside the stator mechanism 21. There is a certain gap between the rotor mechanism 22 and the stator mechanism 21 to form a rotor cooling channel 42. Preferably, the rotor mechanism 22 is also provided with rotor cooling channels 42 at the front and rear ends to better dissipate heat from the rotor mechanism 22.

[0028] Combination Figure 2 , Figure 3 , Figure 6 As shown, the stator and rotor assembly also includes a spindle mechanism, which includes a spindle 23 and bearings 24. The rotor mechanism 22 is mounted on the spindle 23 via bearings 24 and can rotate around the spindle 23 (bearings 23 are mounted on the rotor mechanism 22, but the spindle 23 does not rotate). The bearings 24 can be sliding bearings 241 or end-face bearings 242, and can be made of wear-resistant polymer materials. An intermediate cooling channel 43 for liquid medium flow is provided between the rotor mechanism and the spindle mechanism. The liquid medium flows between the spindle 23 and the bearings 24 for lubrication and heat dissipation, thereby reducing friction and extending the service life of the bearings 24. It can also pass between the bearings 24 and the rotor mechanism 22. Meanwhile, as... Figure 6 As shown, the outer ring and inner ring of the bearing 24 are respectively provided with grooves 2411. Liquid medium can flow through the bearing 24 through the grooves 2411. It is worth mentioning that the grooves 2411 are not limited to straight lines, but can also be spiral or other shapes.

[0029] Based on the above, the liquid medium is composed of, for example... Figure 5 The cooling channel inlet 40 shown flows into the pump casing 1 and sequentially passes through the stator cooling channel 41 between the stator housing and the pump casing 1, the rotor cooling channel 42 between the front and rear ends of the rotor mechanism 22 and the stator mechanism 21, and the intermediate cooling channel 43 between the rotor mechanism 22 and the main shaft mechanism before being discharged from the cooling channel outlet. The cooling channel outlet is located near the connection between the main shaft 23 and the impeller 3. The impeller 3 forms a low-pressure zone and a high-pressure zone within the flow channel by rotating. The cooling channel outlet is located in the low-pressure zone, and the cooling channel inlet 40 is located in the high-pressure zone. This allows the liquid medium to flow within the cooling channel, which can reduce cavitation.

[0030] Based on this, a control method for the aforementioned server liquid cooling pump is also provided. The impeller 3 rotates, causing the liquid medium in the flow channel to flow into the pump casing 1 from the cooling channel inlet 40 in the high-pressure zone of the flow channel. After being cooled sequentially by the outside of the stator mechanism 21 and the outside of the rotor mechanism 22, it enters the space between the bearing 24 and the main shaft 23, and finally flows out from the cooling channel outlet in the low-pressure zone of the flow channel. This generates an axial reaction force on the impeller 3 to counteract the axial force generated during its rotation, achieving self-balancing. Furthermore, the temperature of the liquid medium can be monitored using a temperature monitoring device. When the temperature rises, the impeller 3 speed is increased, thereby enhancing the heat dissipation effect.

[0031] In addition, such as Figure 2 As shown, the liquid-cooled pump also includes a controller assembly 51, which includes a control board 52 located in the rear cavity of the pump housing 1. The control board 52 is used to control the stator and rotor assembly. The rear cavity of the pump housing 1 is formed by a heat-conducting end cover 53. One side of the heat-conducting end cover 53 is in contact with the liquid medium, so that the heat of the controller assembly 51 can be carried away by the liquid medium. Specifically, the liquid medium flows in from the balance hole (i.e., the cooling channel inlet 40) opened at the high pressure outlet of the pump head volute (i.e., the flow channel housing 44 below), passes through the guide groove on the outer surface of the stator mechanism, and reaches the rear cooling channel of the stator and rotor assembly to absorb the heat of the rear control board 52. It then flows out through the rotor inner hole from the bearing 24 and the main shaft 23 and the gap, and then flows out from the center of the impeller 3, carrying its heat out of the pump body.

[0032] Specifically, in combination Figure 4 The stator housing is connected to the heat-conducting end cap 53 via a connecting pipe 217. Both ends of the connecting pipe 217 are welded and sealed to the stator housing and the heat-conducting end cap 53 respectively, preventing liquid media from entering the interior. The connecting pipe 217 also connects the internal space of the stator housing to the rear cavity of the pump housing 1. The stator wiring harness is connected to the control board 52 via the connecting pipe 217. The pump housing 1 is only connected to the flow channel housing 44 at the... Figure 2 An opening is provided at point A in the middle, and this opening is sealed to the flow channel housing through a double O-ring sealing structure, thereby reducing the risk of leakage of the entire device.

[0033] This device boasts several key advantages: 1. Full immersion thermal isolation of the stator and rotor significantly reduces heat leakage; 2. Self-balancing pump chamber pressure differential eliminates the need for additional structures; 3. Forced lubrication of the bearings by the liquid medium through pressure differential increases bearing life (up to 10 years or more); 4. Only one connection point on the pump casing, minimizing leakage risk. These advantages make this device particularly suitable for high-performance servers. However, this solution is not limited to servers; it can also be used as an equivalent replacement for other liquid cooling applications. Furthermore, to further enhance performance, the motor structure can utilize a high-efficiency brushless motor, the impeller 3 can employ a high-efficiency curved impeller, and the control board 52 can be a high-efficiency, energy-saving control board, thereby increasing the pump's power density. Since the device exhibits near-zero heat leakage, the casing in contact with the liquid medium is not limited to stainless steel. It can be injection-molded from materials such as PPS, while meeting mechanical and chemical performance requirements, significantly reducing production costs.

[0034] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A server liquid cooling pump, comprising a pump casing, a stator-rotor assembly, and an impeller, wherein the stator-rotor assembly is installed within the pump casing, and the stator-rotor assembly is used to drive the impeller to rotate and cause a liquid medium to flow within a flow channel, characterized in that: The pump casing is also provided with a cooling channel, which is connected to the flow channel. The liquid medium can enter the cooling channel and immerse the stator and rotor assembly in the liquid medium, thereby dissipating heat from the stator and rotor assembly.

2. A server liquid cooling pump according to claim 1, characterized in that: The stator-rotor assembly includes a stator mechanism, which includes a stator housing and a stator. The stator is located inside the stator housing, and there is a certain gap between the stator housing and the pump housing to form the cooling channel.

3. A server liquid cooling pump according to claim 2, characterized in that: The outer surface of the stator housing is provided with partition strips, which are distributed around the stator housing to divide the cooling channel between the stator housing and the pump housing into uniform guide grooves; The stator housing is formed by plastic sealing of the stator or by assembling a partition on the outer periphery, a front plate and a rear plate at the front and rear ends, and an isolation sleeve on the inner side. The outer surface of the partition is provided with the flow guide groove. The rear plate is connected to a connecting pipe. The isolation sleeve is sealed to the bottom of the front plate and the bottom of the rear plate through O-rings. After the stator is placed into the stator housing, the inside of the stator housing is filled with glue.

4. A server liquid cooling pump according to claim 2, characterized in that: The stator-rotor assembly further includes a rotor mechanism, which includes a rotor housing and a rotor. The rotor mechanism is located inside the stator mechanism, and there is a certain gap between the front and rear ends of the rotor mechanism and between the rotor mechanism and the stator mechanism to form the cooling channel.

5. A server liquid cooling pump according to claim 2 or 4, characterized in that: The stator-rotor assembly further includes a rotor mechanism and a main shaft mechanism. The rotor mechanism is located inside the stator mechanism, and a cooling channel for the flow of liquid medium is provided between the main shaft mechanism and the rotor mechanism.

6. A server liquid cooling pump according to claim 5, characterized in that: The spindle mechanism includes a spindle and a bearing. The rotor mechanism is mounted on the spindle via the bearing and is able to rotate around the spindle. The liquid medium flows between the spindle and the bearing through a pressure difference for heat dissipation and lubrication of the bearing.

7. A server liquid cooling pump according to claim 5, characterized in that: The liquid medium flows into the pump casing through the cooling channel inlet and flows sequentially between the stator mechanism and the pump casing, between the front and rear ends of the rotor mechanism and the stator mechanism, and between the rotor mechanism and the main shaft mechanism before being discharged through the cooling channel outlet. The impeller forms a low-pressure zone and a high-pressure zone within the flow channel by rotating. The cooling channel outlet is located in the low-pressure zone, and the cooling channel inlet is located in the high-pressure zone.

8. A server liquid cooling pump according to any one of claims 1, 2, 4, 6, and 7, characterized in that: The liquid-cooled pump also includes a controller assembly, which includes a control board located in the rear cavity of the pump housing and connected to the stator and rotor assembly via a wiring harness. The wiring harness is isolated from the liquid medium via a connecting pipe. The rear cavity of the pump housing is formed by a heat-conducting end cap, one side of which is in contact with the liquid medium.

9. A server liquid cooling pump according to claim 8, characterized in that: The pump casing has an opening only at the connection point with the flow channel casing, and this opening is sealed to the flow channel casing by a sealing structure.

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