Server liquid cooling pump and regulation and control method thereof

Abstract

According to the server liquid cooling pump and the regulation and control method thereof, the server liquid cooling pump has the advantages that self heat dissipation is achieved through a liquid medium, the reliability of the pump is high, the service life is long, the pressure difference of a pump cavity is self-balanced, and the leakage risk of the device tends to be zero. The structure comprises a pump shell, a stator and rotor assembly and an impeller, the stator and rotor assembly is installed in the pump shell, the stator and rotor assembly is used for driving the impeller to rotate and enabling a liquid medium to flow in a flow channel, a cooling channel is further formed in the pump shell and communicates with the flow channel, and the liquid medium can enter the cooling channel and enable the stator and rotor assembly to be immersed in the liquid medium. Therefore, the stator and rotor assembly is cooled.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid cooling pumps, in particular to a server liquid cooling pump and a control method thereof. BACKGROUND

[0002] With the exponential growth of computing power density, traditional air cooling has reached the physical limit, and liquid cooling system has become the inevitable choice for high-density servers. The performance of the liquid cooling pump as the core power component directly affects whether the server can work normally.

[0003] Regarding the structure of the server liquid cooling pump, it includes a pump shell, a stator installed in the pump shell, a rotor assembly and an impeller. After the liquid cooling pump is powered on, the rotor assembly of the motor structure can rotate relative to the stator, thereby rotating the impeller. The medium is driven to flow by the impeller, thereby removing the heat at the relevant positions in the server.

[0004] However, since the impeller needs to be driven by the motor structure, the heat generated by the motor and the controller will be conducted to the server control cabinet, causing the temperature in the cabinet to rise and affecting the server. In order to reduce the influence of the self-heating of the liquid cooling pump, the traditional method is to add heat sinks to the liquid cooling pump, which not only has limited cooling effect (high temperature shortens the service life of the motor), but also increases the volume of the liquid cooling pump, which violates the trend of server compactness. The method for reducing the heat of the liquid cooling pump in the prior art, such as the water pump with a self-cooling structure disclosed in CN116221138A, has a self-cooling member outside the motor structure. Part of the liquid stirred by the pump blade enters the self-cooling member and then returns to the pump body from the self-cooling member, thereby absorbing the heat generated by the motor. Although this method can reduce the influence of the heat generated by the motor on the outside, the additional self-cooling member still significantly increases the volume of the water pump. SUMMARY

[0005] In view of the problem of self-heating affecting the service life or occupying a large space of the existing liquid pump, the present application provides a server liquid cooling pump, and its control method, which can effectively reduce the influence of self-heating on the server, and the volume change of the water pump with additional cooling and cooling components is not obvious.

[0006] The technical solution is as follows: a server liquid cooling pump, comprising a pump shell, a stator-rotor assembly and an impeller, the stator-rotor assembly is installed in the pump shell, the stator-rotor assembly is used to drive the impeller to rotate and make the liquid medium flow in the flow channel, characterized in that: a cooling channel is further arranged in the pump shell, the cooling channel is communicated with the flow channel, the liquid medium can enter the cooling channel and immerse the stator-rotor assembly in the liquid medium, thereby cooling the stator-rotor assembly, effectively controlling the temperature of the motor and the controller heating assembly, and effectively prolonging the service life of the water pump.

[0007] Further, the stator-rotor assembly comprises a stator mechanism, which comprises a stator housing and a stator, the stator being located in the stator housing and there being a gap between the stator housing and the pump housing for forming the cooling channel.

[0008] Further, the outer surface of the stator housing is provided with partition strips distributed around the stator housing for partitioning the cooling channel between the stator housing and the pump housing into uniform flow guide grooves.

[0009] The stator housing is formed by plastic sealing of the stator or is assembled by a partition plate located at the outer periphery, a front edge plate and a rear edge plate located at the front and rear ends, and an isolation sleeve located at the inner side, the outer surface of the partition plate being provided with the flow guide grooves, the rear edge plate being connected with a connecting pipe, the isolation sleeve being sealed and connected with the bottom of the front edge plate and the bottom of the rear edge plate through O-shaped sealing rings, and the stator being filled with glue after being placed in the stator housing.

[0010] Further, the stator-rotor assembly further comprises a rotor mechanism, which comprises a rotor housing and a rotor, the rotor mechanism being located inside the stator mechanism, and there being a gap between the front and rear ends of the rotor mechanism and between the rotor mechanism and the stator mechanism for forming the cooling channel.

[0011] Further, the stator-rotor assembly further comprises a rotor mechanism and a main shaft mechanism, the rotor mechanism being located inside the stator mechanism, and a cooling channel for the flow of liquid medium being provided between the main shaft mechanism and the rotor mechanism.

[0012] Further, the main shaft mechanism comprises a main shaft and a bearing, the rotor mechanism being installed on the main shaft through the bearing and being able to rotate around the main shaft, and the liquid medium flowing into the space between the main shaft and the bearing through pressure difference for heat dissipation and lubrication of the bearing.

[0013] Further, the liquid medium flows into the pump housing through the cooling channel inlet and successively flows through the space between the stator housing and the pump housing, the space between the front and rear ends of the rotor mechanism and the stator mechanism, and the space between the rotor mechanism and the main shaft mechanism, and is discharged through the cooling channel outlet, the impeller forming a low pressure area and a high pressure area in the flow channel through rotation, the cooling channel outlet being located in the low pressure area and the cooling channel inlet being located in the high pressure area.

[0014] Further, the liquid cooling pump further comprises a controller assembly, the controller assembly comprises a control board, the control board is located in the rear end cavity of the pump shell and connected with the stator-rotor assembly through a wire harness, the wire harness is isolated from the liquid medium through a connecting pipe, the rear end cavity of the pump shell is formed by a heat-conducting end cover, and one side of the heat-conducting end cover is in contact with the liquid medium.

[0015] Further, the pump shell is only opened at the connection position with the flow channel shell, and the opening position is sealed and connected with the flow channel shell through a sealing structure.

[0016] A control method of the server liquid cooling pump, characterized in that: the liquid medium in the flow channel flows into the pump shell from the cooling channel inlet of the high-pressure area of the flow channel through the rotation of the impeller, and then sequentially passes through the outside of the stator mechanism and the outside of the rotor mechanism to dissipate heat, enters between the bearing and the main shaft and finally flows out from the cooling channel outlet of the low-pressure area of the flow channel, thereby generating an axial reaction force on the impeller to offset the axial force generated in the rotation process, and self-balancing is realized.

[0017] Advantages: by directly introducing the liquid medium into the pump shell to dissipate heat for the stator-rotor assembly, the influence of the self-heating of the liquid cooling pump on the server can be effectively reduced, and compared with other water pumps with additional cooling and heat dissipation components, the liquid cooling pump does not need to be additionally provided with large-volume heat dissipation components, so that the volume change is small, the internal space of the server can be effectively utilized, and the scheme not only introduces the liquid medium into the pump shell, but also immerses the stator-rotor assembly in the liquid medium, so that the heat leakage is approximately zero.

[0018] In addition, the scheme has the following advantages: 1. The liquid medium passes through the bearing to forcibly lubricate the bearing, reduce friction, and increase the service life of the pump; 2. The cooling channel outlet is located at the impeller, which can reduce cavitation; 3. The liquid medium in the high-pressure area is fed back to the low-pressure area to form a counterforce to offset the axial thrust, so that the impeller is in force balance; 4. The pump shell is only sealed at one position, and the risk of leakage is low. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a front view structural schematic diagram of the present application;

[0020] Figure 2 It is a front view structural schematic diagram of the present application; Figure 1 It is a sectional view schematic diagram of A-A of the present application;

[0021] Figure 3 It is a structural schematic diagram of the rotor mechanism, the impeller and the bearing;

[0022] Figure 4 It is a structural schematic diagram of the stator mechanism;

[0023] Figure 5 It is a schematic diagram of the cooling channel inlet position;

[0024] Figure 6 This is a schematic diagram of a sliding bearing structure. Detailed Implementation

[0025] like Figure 1 , Figure 2 The 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 in the middle) The cooling channel is connected to the flow channel, and 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.

[0026] 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.

[0027] Specifically, the stator housing is formed by plastic-coating the stator, and its material may include PPS and fiberglass. 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] On this basis, a control method of the server liquid cooling pump is also provided. The liquid medium in the flow channel flows into the pump shell 1 from the cooling channel inlet 40 of the high-pressure area of the flow channel through the rotation of the impeller 3, and then sequentially passes through the outside of the stator mechanism 21 and the outside of the rotor mechanism 22 to dissipate heat, and then enters between the bearing 24 and the main shaft 23, and finally flows out from the cooling channel outlet of the low-pressure area of the flow channel, thereby generating an axial reaction force on the impeller 3 to offset the axial force generated during rotation, and achieving self-balancing. The temperature of the liquid medium can also be monitored by the temperature monitoring device. When the temperature rises, the rotation speed of the impeller 3 is increased, thereby enhancing the heat dissipation effect.

[0032] In addition, as shown in Figure 2 , the liquid cooling pump further comprises a controller assembly 51, and the controller assembly 51 comprises a control board 52 located in the rear end cavity of the pump shell 1 for controlling the stator-rotor assembly. The rear end cavity of the pump shell 1 is formed by a heat-conducting end cover 53, one side of the heat-conducting end cover 53 being in contact with the liquid medium, so that the heat of the controller assembly 51 can be taken away by the liquid medium. Specifically, the liquid medium flows into the balance hole (i.e. the cooling channel inlet 40) of the pump head volute (i.e. the flow channel shell 44) from the high-pressure outlet, passes through the flow guide groove on the outer surface of the stator mechanism, and absorbs the heat of the rear end control board 52 through the cooling channel at the rear end of the stator-rotor assembly. The heat is taken away from the pump body through the flow out of the bearing 24 and the main shaft 23 and the gap, and then the flow out of the center of the impeller 3.

[0033] Specifically, in combination with Figure 4 , the stator housing is connected with the heat-conducting end cover 53 through a connecting pipe 217, and the two ends of the connecting pipe 217 are respectively sealed and connected with the stator housing and the heat-conducting end cover 53 by welding to avoid the entry of the liquid medium into the interior, and the connecting pipe 217 connects the internal space of the stator housing and the rear end cavity of the pump shell 1, and the wire harness of the stator is connected with the control board 52 through the connecting pipe 217. The pump shell 1 is only opened at the connection between the pump shell 1 and the flow channel shell 44 (A in the figure) Figure 2 , and the opening is sealed and connected with the flow channel shell through the sealing structure of the double O-shaped sealing ring, thereby reducing the leakage risk of the entire device.

[0034] The device has the following advantages: 1. The stator and rotor are fully immersed and thermally isolated, greatly reducing heat leakage; 2. The pressure difference of the pump cavity is self-balanced, and no additional structure is required; 3. The liquid medium forcibly lubricates the bearing using the pressure difference, increasing the service life of the bearing (up to 10 years or more); 4. The pump shell has only one connection port, and the risk of leakage is close to zero. These advantages make the device particularly suitable for high-performance servers, but the scheme is not limited to servers and can be used in other liquid cooling places. In addition, to further improve the performance of the device, the motor structure can use a high-efficiency brushless motor, the impeller 3 can use a high-efficiency curved surface impeller, and the control board 52 can use a high-efficiency, energy-saving control board, thereby improving the power density of the pump; due to the device's heat leakage tending to zero, the shell in contact with the liquid medium can not be limited to stainless steel, and materials such as PPS can be used to form an injection molding on the basis of meeting mechanical and chemical properties, thereby greatly reducing the production cost of the device.

[0035] The above is only a preferred embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection 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 is only open at the connection point with the flow channel casing, and this opening is sealed to the flow channel casing by a sealing structure.

10. A method for regulating a server liquid cooling pump according to claim 7, characterized in that: The impeller rotation causes the liquid medium in the flow channel to flow into the pump casing through the cooling channel inlet in the high-pressure zone of the flow channel. After passing through the outside of the stator mechanism and the outside of the rotor mechanism to dissipate heat, it enters the space between the bearing and the main shaft and finally flows out through the cooling channel outlet in the low-pressure zone of the flow channel. This generates an axial reaction force on the impeller to counteract the axial force generated during its rotation, thus achieving self-balancing.

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