Totally-closed liquid supply pump for CDU liquid cooling cabinet and working method of totally-closed liquid supply pump

Abstract

The invention belongs to the technical field of electrical elements, and particularly relates to cooling and temperature control, in particular to a totally-closed liquid supply pump for a CDU liquid cooling cabinet and a working method of the totally-closed liquid supply pump. The totally-closed liquid supply pump for the CDU liquid cooling cabinet comprises a stainless steel shell, a permanent magnet motor, a multi-stage impeller set, a connecting support and a coupling (5), the permanent magnet motor and the multi-stage impeller set are fixedly connected through the connecting support, and a rotor of the permanent magnet motor is in rigid transmission connection with an impeller of the multi-stage impeller set through the coupling (5); a liquid inlet is formed in one end of the stainless steel shell, a liquid outlet is formed in the other end of the stainless steel shell, and the stainless steel shell is of a fully-closed structure; when the permanent magnet motor drives the multi-stage impeller set to work, liquid flows into the stainless steel shell through the liquid inlet, sequentially flows through the multi-stage impeller set, the connecting support and the permanent magnet motor and then flows out through the liquid outlet.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrical components, specifically involving cooling and temperature control, and particularly relates to a fully enclosed liquid supply pump for a CDU liquid-cooled cabinet and its working method. Background Art

[0002] With the continuous improvement of the computing power density in data centers, liquid-cooled heat dissipation has become the mainstream method for heat dissipation in data center cabinets. As the core unit of the liquid-cooled system, the performance of the internal liquid supply pump in the CDU liquid-cooled cabinet directly determines the heat dissipation efficiency and operating stability of the liquid-cooled system. Currently, most of the liquid supply pumps supporting CDU liquid-cooled cabinets adopt industrial-frequency centrifugal liquid supply pumps. Such liquid supply pumps mainly consist of an industrial-frequency motor, a centrifugal pump body, and a shaft seal structure, which are the conventional configurations of data center liquid-cooled systems.

[0003] However, in the actual application process, there are many defects in the compatibility between traditional industrial-frequency centrifugal liquid supply pumps and CDU liquid-cooled cabinets: First, the driving end of the traditional liquid supply pump is an industrial-frequency motor. The stator and rotor structure design of the industrial-frequency motor limits the speed increase, and its large external dimensions and heavy weight make the entire centrifugal liquid supply pump bulky, occupying a large amount of installation space in the CDU liquid-cooled cabinet, seriously hindering the compact layout of the CDU liquid-cooled cabinet, and reducing the space utilization rate of the cabinet. Second, a shaft seal structure is used for dynamic sealing between the motor and the impeller assembly of the traditional liquid supply pump. The pressure resistance performance of this sealing structure is poor, and during the long-term high-speed rotation operation process, the shaft seal parts are prone to wear and aging, which may further cause shaft seal liquid leakage, and even shaft seal failure leading to liquid leakage, posing serious safety hazards. Third, the traditional industrial-frequency motor uses air-cooled heat dissipation, with low heat dissipation efficiency. In the enclosed CDU liquid-cooled cabinet, the heat generated by the motor during operation is difficult to quickly dissipate, easily causing the motor to overheat and be damaged, affecting the service life of the liquid supply pump. Fourth, the traditional liquid supply pump is an independent equipment structure, which needs to be separately arranged in the CDU liquid-cooled cabinet. At the same time, additional liquid supply and return pipelines need to be connected, resulting in a complex pipeline layout inside the cabinet, further reducing the space utilization rate and increasing the risk of pipeline liquid leakage.

[0004] To solve the above technical problems, developing a fully enclosed liquid supply pump for a CDU liquid-cooled cabinet and its working method that is suitable for the compact layout of the CDU liquid-cooled cabinet, has no leakage risk, high heat dissipation efficiency, and can be maintenance-free has become a technical problem that needs to be urgently solved by those skilled in the art.

[0005] It should be noted that the above information disclosed in this background art section is only used to understand the background art of the concept of this application. Therefore, the above description is not considered to constitute information on related technologies. Summary of the Invention

[0006] This disclosure provides at least one fully enclosed liquid supply pump for a CDU liquid-cooled cabinet and its operating method.

[0007] In a first aspect, embodiments of this disclosure provide a fully enclosed liquid supply pump for a CDU liquid-cooled cabinet, comprising: The system includes a stainless steel casing, a permanent magnet motor, a multi-stage impeller assembly, a connecting bracket, and a coupling. The permanent magnet motor and the multi-stage impeller assembly are fixedly connected by the connecting bracket, and the rotor of the permanent magnet motor is rigidly connected to the impeller of the multi-stage impeller assembly through the coupling. The stainless steel shell has a liquid inlet at one end and a liquid outlet at the other end, and the stainless steel shell is a fully enclosed structure. When the permanent magnet motor drives the multi-stage impeller assembly, the liquid flows into the stainless steel shell through the inlet, and then flows through the multi-stage impeller assembly, the connecting bracket and the permanent magnet motor in sequence before flowing out through the outlet.

[0008] In one optional embodiment, the permanent magnet motor consists of a neodymium iron boron permanent magnet rotor and a silicon steel sheet stator, both of which are fully sealed in stainless steel.

[0009] In one optional embodiment, the multi-stage impeller assembly is composed of several centrifugal impellers, impeller cavities, and impeller ceramic bearings. Adjacent impeller cavities are sealed by sealing rings, and all impeller cavities are locked together as a single unit by screws. Several centrifugal impellers are arranged sequentially along the fluid flow direction.

[0010] In one optional embodiment, the permanent magnet motor and the multi-stage impeller assembly are fixed to the cavity of the stainless steel housing by a perforated flange, and a gap is left between the outer wall of the permanent magnet motor and the inner wall of the stainless steel housing, which serves as a flow channel for the liquid supply medium.

[0011] In one optional embodiment, the connection form of the liquid inlet and liquid outlet of the stainless steel shell is any one of quick-connect type, flange type or threaded type, and the liquid inlet and liquid outlet are adapted to the main liquid supply pipeline of the CDU liquid cooling cabinet. The stainless steel shell can replace part of the main liquid supply pipeline of the CDU liquid cooling cabinet as a water flow channel.

[0012] In one optional implementation, the permanent magnet motor is an adjustable-speed, high-efficiency permanent magnet motor, whose speed can be steplessly adjusted according to the liquid supply requirements of the CDU liquid-cooled cabinet.

[0013] In one alternative implementation, the elongated permanent magnet motor reduces the overall size of the motor by increasing the magnetic flux area of ​​the stator and rotor.

[0014] In one optional implementation, the number of centrifugal impellers in the multi-stage impeller group is adapted to the actual liquid supply head and flow rate requirements of the CDU liquid cooling cabinet, and the liquid supply medium is output from the outlet after being pressurized step by step by the multi-stage centrifugal impellers.

[0015] In one optional embodiment, a buffer disc is slidably disposed within the connecting bracket, and the buffer disc is sleeved on the outer wall of the coupling. The buffer disk has several adjustment ports evenly distributed along the axial direction. The connecting bracket is provided with several limiting strips at one end near the permanent magnet motor, which are adapted to the adjustment port and are suitable for insertion into the adjustment port.

[0016] In one optional embodiment, the axial length of the limiting strip is greater than the axial thickness of the buffer disk; An elastic element is provided between the side wall of the buffer plate and the inner wall of the connecting bracket. The elastic element is adapted to push the buffer plate to move away from the limiting strip.

[0017] Secondly, this disclosure also provides a method for operating a liquid supply pump, the method comprising: When the permanent magnet motor drives the multi-stage impeller assembly, the liquid flows into the stainless steel shell through the inlet, and then flows through the multi-stage impeller assembly, the connecting bracket and the permanent magnet motor in sequence before flowing out through the outlet. If the fluid velocity inside the stainless steel casing does not exceed the first velocity, the fluid pushes the buffer plate inside the connecting bracket to move toward the permanent magnet motor. If the fluid velocity inside the stainless steel casing exceeds the first velocity, the fluid pushes the buffer plate inside the connecting bracket to move towards the permanent magnet motor until the limit bar is inserted into the adjustment port.

[0018] The beneficial effects of this invention are as follows: This invention provides a fully enclosed liquid supply pump for CDU liquid-cooled cabinets and its operating method. By adopting a stainless steel fully enclosed shell design, the permanent magnet motor and multi-stage impeller assembly are both built into the stainless steel shell cavity, eliminating the shaft seal structure of traditional liquid supply pumps and fundamentally avoiding leakage problems caused by shaft seal wear and aging. By adopting a slender permanent magnet motor and utilizing the design concept of increasing the magnetic flux area of ​​the stator and rotor, the motor's external size is significantly reduced while ensuring motor power. Combined with the multi-stage centrifugal impeller structure, while meeting the liquid supply head requirements, the outer diameter of a single impeller is greatly reduced, allowing both the motor and impeller assembly to maintain a slender structure, which can be directly embedded into the liquid supply pipeline of the CDU liquid-cooled cabinet. The liquid inlet and outlet at both ends of the stainless steel shell are directly compatible with the main liquid supply pipeline of the cabinet. The shell can replace part of the main liquid supply pipeline as a water flow channel, eliminating the need to occupy additional cabinet space for pump and pipeline placement, effectively achieving a compact layout of the CDU liquid-cooled cabinet and significantly improving space utilization.

[0019] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 A perspective view of a fully enclosed liquid supply pump for a CDU liquid-cooled cabinet provided in an embodiment of this disclosure; Figure 2 An axial sectional perspective view of a stainless steel casing provided in an embodiment of this disclosure; Figure 3 A cross-sectional perspective view of the connecting bracket and buffer plate provided in the embodiments of this disclosure; Figure 4 This is a schematic diagram showing the state of the limiting strip inserted into the buffer disk according to an embodiment of this disclosure.

[0023] In the picture: 1. Stainless steel casing; 11. Liquid inlet; 12. Liquid outlet; 2. Permanent magnet motor; 20. Multi-hole flange; 3. Multistage impeller assembly; 31. Centrifugal impeller; 32. Impeller cavity; 33. Impeller ceramic bearing; 4. Connecting bracket; 40. Limiting strip; 5. Couplings; 6. Buffer plate; 60. Adjustment port; 61. Elastic element. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0026] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify an entire column of elements when following a column of elements. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0027] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise expressly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0028] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0029] Research has revealed several shortcomings in the compatibility between traditional industrial frequency centrifugal liquid supply pumps and CDU liquid cooling cabinets in practical applications: Firstly, the drive end of the traditional liquid supply pump is an industrial frequency motor. The stator and rotor structure design of the industrial frequency motor limits the speed increase, and the large size and heavy weight make the entire centrifugal liquid supply pump bulky, occupying a lot of installation space in the CDU liquid cooling cabinet, which seriously hinders the compact layout of the CDU liquid cooling cabinet and reduces the cabinet space utilization. Secondly, the traditional liquid supply pump uses a shaft seal structure for dynamic sealing between the motor and the impeller assembly. This sealing structure has poor pressure resistance, and during long-term high-speed rotation, the shaft seal is prone to wear and aging, which can lead to shaft seal leakage or even shaft seal failure, resulting in leakage and posing a serious safety hazard. Third, traditional industrial frequency motors use air cooling, which has low heat dissipation efficiency. In the closed CDU liquid cooling cabinet, the heat generated by the motor is difficult to dissipate quickly, which can easily lead to overheating and damage to the motor, affecting the service life of the liquid supply pump. Fourth, the traditional liquid supply pump is an independent equipment structure that needs to be arranged separately in the CDU liquid cooling cabinet. It also requires additional connection of supply and return liquid pipelines, which leads to a complex internal pipeline layout, further reducing space utilization and increasing the risk of pipeline leakage.

[0030] To address the aforementioned technical challenges, developing a fully enclosed liquid supply pump for CDU liquid-cooled cabinets that is compatible with compact layouts, eliminates leakage risks, offers high heat dissipation efficiency, and requires no maintenance, along with its operating method, has become a pressing technical problem for those skilled in the art.

[0031] The defects in the above solutions and the reasons for their occurrence are the results of the inventors' practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventors' contributions to this disclosure.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0034] like Figures 1 to 4 As shown, at least one embodiment provides a fully enclosed liquid supply pump for a CDU liquid-cooled cabinet, including: a stainless steel housing 1, a permanent magnet motor 2, a multi-stage impeller assembly 3, a connecting bracket 4, a coupling 5, a buffer disc 6, and an elastic element 61. These components work together to achieve fully enclosed liquid supply, stepless speed regulation, liquid cooling, and maintenance-free operation. The specific structure is as follows: like Figure 1The stainless steel outer shell 1 is a one-piece molded structure made of 304 stainless steel, possessing high strength, corrosion resistance, and high pressure resistance. Its rated working pressure can reach 1.6MPa, fully adapting to the high-pressure liquid supply requirements of the CDU liquid-cooled cabinet. The outer shell has a slender cylindrical structure, with its length designed according to the pipe spacing of the CDU liquid-cooled cabinet, allowing it to be directly embedded in the main liquid supply pipeline of the cabinet. One end of the stainless steel outer shell 1 is welded to an inlet 11, and the other end is welded to an outlet 12. The connection method of the inlet 11 and outlet 12 can be any one of quick-connect, flange, or threaded, and the inlet 11 and outlet 12 are compatible with the main liquid supply pipeline of the CDU liquid-cooled cabinet. The stainless steel outer shell 1 can replace part of the main liquid supply pipeline of the CDU liquid-cooled cabinet as a water flow channel. The interior of the stainless steel outer shell 1 is a hollow cavity, and the inner wall of the cavity is precision polished, with a surface roughness Ra≤0.8μm, reducing the flow resistance of the liquid supply medium and preventing internal corrosion caused by medium residue. Figure 1 In the diagram, F1 indicates the direction of liquid flow; after the liquid flows into the stainless steel casing 1 through the inlet 11, it flows out through the outlet 12.

[0035] like Figure 2 The permanent magnet motor 2 is a slender, adjustable-speed, high-efficiency permanent magnet synchronous motor with a rated power of 1.5-5.5kW and a rated speed range of 1500-3000r / min. Its speed regulation accuracy is ±10r / min. It can achieve stepless speed regulation via an external frequency converter or the control system of the CDU liquid-cooled cabinet, adapting to different liquid supply requirements under varying heat dissipation loads. The permanent magnet motor 2 consists of a neodymium iron boron permanent magnet rotor and a silicon steel sheet stator. Both the neodymium iron boron permanent magnet rotor and the silicon steel sheet stator are fully sealed in 316 stainless steel with a sealing thickness of 3-5mm to prevent the liquid supply medium from entering the motor and causing short circuits or corrosion. Figure 2 In the diagram, F1 indicates the direction of liquid flow within the stainless steel casing 1.

[0036] The permanent magnet motor 2 is equipped with ceramic bearings at both ends. These bearings are made of silicon nitride ceramic, which features high hardness, strong wear resistance, and good self-lubricating properties. The coefficient of friction is ≤0.01, resulting in a long service life and requiring no additional lubrication maintenance. The permanent magnet motor 2 is fixed to the cavity of the stainless steel housing 1 via a multi-hole flange 20. The multi-hole flange 20 has 8-12 evenly spaced flow holes with a diameter of 10-15mm, allowing the liquid supply medium to pass smoothly while maintaining a 10-15mm gap between the motor and the inner wall of the housing, forming a cooling channel for the liquid supply medium.

[0037] like Figure 2The multi-stage impeller assembly 3 consists of a centrifugal impeller 31, an impeller cavity 32, an impeller ceramic bearing 33, a sealing ring, and a locking screw. In this embodiment, the number of centrifugal impellers 31 is 3-8 stages, and the specific number is determined according to the liquid supply head requirements of the CDU liquid cooling cabinet (a head of 50-150m corresponds to 3-5 stages of impellers).

[0038] The centrifugal impeller 31 is injection molded from engineering plastic PPS, with an outer diameter of 50-70mm and 6-8 blades. The impeller cavity 32 is made of 304 stainless steel. Each impeller cavity 32 corresponds to one centrifugal impeller 31. Fluororubber sealing rings are installed between adjacent impeller cavities 32. The sealing rings have excellent oil resistance and sealing performance to prevent interstage leakage.

[0039] All impeller chambers 32 are axially locked into a single structure by four locking screws made of 304 stainless steel, with a preload torque of 20-30 N·m to ensure structural stability. The impeller ceramic bearing 33 is made of the same material as the motor ceramic bearing and is mounted at the input end of the multi-stage impeller assembly 3, coaxially arranged with the rotor of the permanent magnet motor 2 to ensure rotational accuracy.

[0040] like Figure 3 The connecting bracket 4 is a cylindrical structure made of 304 stainless steel, with its outer diameter matching the inner diameter of the stainless steel shell 1. It is fixed to one side of the perforated flange 20 by welding. The interior of the connecting bracket 4 is hollow to accommodate the coupling 5 and the buffer disc 6. Several through-holes are radially provided in the connecting bracket 4 to facilitate the flow of fluid medium through the connecting bracket 4 to the gap between the outer wall of the permanent magnet motor 2 and the inner wall of the stainless steel shell. Four limiting strips 40 are evenly arranged circumferentially at the end of the connecting bracket 4 closest to the permanent magnet motor 2. The limiting strips 40 are arc-shaped and precisely match the adjustment port 60 of the buffer disc 6. The coupling 5 is a flexible coupling made of polyurethane. Both ends are fixed to the rotor of the permanent magnet motor 2 and the input shaft of the multi-stage impeller assembly 3 by keys, respectively. It transmits torque in the range of 5-20 N·m and has certain buffering and vibration reduction performance, compensating for the installation coaxiality error between the motor and the impeller assembly (allowable error ≤0.1 mm).

[0041] In practical applications, the inventors also discovered that after the fluid passes through the multi-stage impeller assembly 3, its velocity and pressure increase. The sudden increase in velocity can cause the connection between the connecting bracket 4 and the permanent magnet motor 2 to become loose, affecting the stability and coaxiality of the connection between the permanent magnet motor 2 and the multi-stage impeller assembly 3. Therefore, a buffer plate 6 needs to be installed inside the connecting bracket 4 to prevent the water flowing out of the multi-stage impeller assembly 3 from directly impacting the end wall of the connecting bracket 4 near the permanent magnet motor 2.

[0042] like Figure 3The buffer disc 6 is a ring-shaped structure made of 304 stainless steel. Its outer diameter is fitted with the inner diameter of the connecting bracket 4 with a clearance of 0.1-0.2mm, allowing it to slide freely along the axial direction of the connecting bracket 4. The thickness of the buffer disc 6 is less than the axial length of the limiting strip 40. Four adjustment ports 60 are evenly provided circumferentially. The size of the adjustment ports 60 is adapted to the limiting strip 40, allowing the limiting strip 40 to be fully inserted and penetrate the buffer disc 6. Figure 3 In the diagram, F1 indicates the direction of liquid flow within the stainless steel casing 1.

[0043] The elastic element 61 is a stainless steel compression spring. One end of the elastic element 61 is welded and fixed to the inner wall of the connecting bracket 4, and the other end abuts against the upper end wall of the buffer plate 6. Under normal conditions, it pushes the buffer plate 6 to move away from the limit bar 40, so that the adjustment port 60 is separated from the limit bar 40.

[0044] like Figure 2 The permanent magnet motor 2 is fixed to one end of the stainless steel housing 1 cavity through the multi-hole flange 20. The motor ceramic bearing is arranged coaxially with the inner wall of the housing to ensure the rotation accuracy of the motor rotor. The connecting bracket 4 is welded and fixed to one side of the perforated flange 20. The coupling 5 passes through the connecting bracket 4, and its two ends are respectively connected to the rotor of the permanent magnet motor 2 and the input shaft of the multi-stage impeller group 3. The buffer disc 6 is sleeved on the outer wall of the coupling 5 and has a clearance fit with the inner wall of the connecting bracket 4. The elastic element 61 is assembled between the buffer disc 6 and the connecting bracket 4 to realize the elastic reset of the buffer disc 6. At the same time, the buffer disc 6 can move axially relative to the outer wall of the coupling 5, which limits the axial displacement of the coupling 5 and further improves the axial stability between the rotor of the permanent magnet motor 2 and the input shaft of the multi-stage impeller group 3.

[0045] like Figure 3 and Figure 4 Working principle of the fully enclosed liquid supply pump used in CDU liquid-cooled cabinets: The liquid supply process begins with the permanent magnet motor 2 being started. The motor speed is set according to the heat dissipation requirements of the CDU liquid-cooled cabinet. The motor rotor drives the centrifugal impellers 31 of the multi-stage impeller assembly 3 to rotate synchronously through the coupling 5. The liquid supply medium enters the impeller cavity 32 from the inlet 11 of the stainless steel shell 1. After being pressurized step by step by each stage of the centrifugal impellers 31, it flows through the internal channel of the connecting bracket 4. The water flow pushes the buffer plate 6 to move axially and flows to all sides through the regulating port 60 and the bottom wall of the buffer plate 6. The water flow enters the cooling channel between the permanent magnet motor 2 and the inner wall of the stainless steel shell 1 to liquid cool the motor. Finally, it flows out from the outlet 12 and enters the liquid supply pipeline of the CDU liquid-cooled cabinet, completing the liquid supply cycle.

[0046] The buffer adjustment mechanism works as follows: When the flow rate of the supplied medium does not exceed the first flow rate, the thrust of the medium on the buffer disc 6 is slightly greater than the preload of the elastic element 61, and the buffer disc 6 is pushed towards the limiting strip 40, at which point the limiting strip 40 is not inserted into the adjustment port 60. The adjustment port 60 and the limiting strip 40 are separated. When the flow rate of the supplied medium exceeds the first flow rate, the thrust of the medium on the buffer disc 6 is greater than the preload of the elastic element 61, pushing the buffer disc 6 towards the permanent magnet motor 2 until the limiting strip 40 is inserted into the adjustment port 60. This avoids excessive vibration of the coupling 5 caused by high-speed fluid, ensuring stable operation of the pump body. At the same time, the buffer disc 6 can prevent high-speed fluid from directly impacting the inner wall of the connecting bracket 4, improving the fixing stability between the connecting bracket 4 and the permanent magnet motor 2.

[0047] Adaptability and expansion design, power adaptation: This invention can select permanent magnet motors 2 with different power specifications such as 1.5kW, 2.2kW, 3.7kW, and 5.5kW according to the power requirements of the CDU liquid-cooled cabinet, and cooperate with 3-8 stage centrifugal impeller 31 components to achieve liquid supply requirements of 50-150m head and 10-50m³ / h flow rate, and adapt to CDU liquid-cooled cabinets with computing power of 50-200kW.

[0048] Material expansion: For special working conditions (such as corrosive liquid supply media), the stainless steel shell 1, impeller cavity 32 and other components can be replaced with 316L stainless steel, the centrifugal impeller 31 can be replaced with PTFE, and the sealing ring can be replaced with perfluororubber to further improve the corrosion resistance of the equipment.

[0049] Intelligent control expansion: Pressure sensors and flow sensors can be added to the liquid inlet 11 and liquid outlet 12 of the stainless steel shell 1, respectively. The sensors are electrically connected to the control system of the CDU liquid cooling cabinet to monitor the liquid supply pressure and flow in real time. The speed of the permanent magnet motor 2 is automatically controlled through the PID adjustment algorithm to achieve precise closed-loop control of the liquid supply parameters and further improve the intelligence level of the liquid cooling system.

[0050] At least one embodiment provides a method of operating a liquid supply pump, the method comprising: When the permanent magnet motor 2 drives the multi-stage impeller assembly 3 to work, the liquid flows into the stainless steel shell 1 through the liquid inlet 11, and flows through the multi-stage impeller assembly 3, the connecting bracket 4 and the permanent magnet motor 2 in sequence before flowing out through the liquid outlet 12. If the fluid velocity inside the stainless steel casing 1 does not exceed the first velocity, the fluid pushes the buffer plate 6 inside the connecting bracket 4 to move toward the permanent magnet motor 2. If the fluid velocity inside the stainless steel casing 1 exceeds the first velocity, the fluid pushes the buffer plate 6 inside the connecting bracket 4 to move towards the permanent magnet motor 2 until the limit bar 40 is inserted into the adjustment port 60.

[0051] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0052] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0053] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A fully enclosed liquid supply pump for a CDU liquid-cooled cabinet, characterized in that, include: The stainless steel casing (1), permanent magnet motor (2), multi-stage impeller assembly (3), connecting bracket (4) and coupling (5) are fixedly connected by the connecting bracket (4), and the rotor of the permanent magnet motor (2) is rigidly connected to the impeller of the multi-stage impeller assembly (3) by the coupling (5). The stainless steel shell (1) is provided with a liquid inlet (11) at one end and a liquid outlet (12) at the other end. The stainless steel shell (1) is a fully enclosed structure. When the permanent magnet motor (2) drives the multi-stage impeller assembly (3) to work, the liquid flows into the stainless steel shell (1) through the inlet (11), and flows through the multi-stage impeller assembly (3), the connecting bracket (4) and the permanent magnet motor (2) in sequence before flowing out through the outlet (12).

2. The fully enclosed liquid supply pump for CDU liquid-cooled cabinets as described in claim 1, characterized in that, The permanent magnet motor (2) consists of a neodymium iron boron permanent magnet rotor and a silicon steel sheet stator, both of which are fully sealed in stainless steel.

3. The fully enclosed liquid supply pump for CDU liquid-cooled cabinets as described in claim 1, characterized in that, The multi-stage impeller assembly (3) is composed of several centrifugal impellers (31), impeller cavities (32) and impeller ceramic bearings (33). Adjacent impeller cavities (32) are sealed by sealing rings, and all impeller cavities (32) are locked together as an integral structure by screws. Several centrifugal impellers (31) are arranged sequentially along the fluid flow direction.

4. The fully enclosed liquid supply pump for CDU liquid-cooled cabinets as described in claim 1, characterized in that, The permanent magnet motor (2) and the multi-stage impeller assembly (3) are fixed to the cavity of the stainless steel shell (1) by a perforated flange (20). There is a gap between the outer wall of the permanent magnet motor (2) and the inner wall of the stainless steel shell (1), which is a flow channel for the liquid supply medium.

5. The fully enclosed liquid supply pump for CDU liquid-cooled cabinets as described in claim 1, characterized in that, The connection form of the liquid inlet (11) and liquid outlet (12) of the stainless steel shell (1) can be any one of quick-installation type, flange type or threaded type, and the liquid inlet (11) and liquid outlet (12) are compatible with the main liquid supply pipeline of the CDU liquid cooling cabinet. The stainless steel shell (1) can replace part of the main liquid supply pipeline of the CDU liquid cooling cabinet as a water flow channel.

6. The fully enclosed liquid supply pump for CDU liquid-cooled cabinets as described in claim 1, characterized in that, The permanent magnet motor (2) is an adjustable speed high efficiency permanent magnet motor (2), and its speed can be steplessly adjusted according to the liquid supply requirements of the CDU liquid cooling cabinet.

7. The fully enclosed liquid supply pump for CDU liquid-cooled cabinets as described in claim 1, characterized in that, The slender permanent magnet motor (2) reduces the overall size of the motor by increasing the magnetic flux area of ​​the stator and rotor.

8. The fully enclosed liquid supply pump for CDU liquid-cooled cabinets as described in claim 3, characterized in that, The number of centrifugal impellers (31) in the multi-stage impeller group (3) is adapted to the actual liquid supply head and flow requirements of the CDU liquid cooler cabinet. The liquid supply medium is pressurized step by step by the multi-stage centrifugal impellers (31) and then output from the liquid outlet (12).

9. The fully enclosed liquid supply pump for CDU liquid-cooled cabinets as described in claim 1, characterized in that, A buffer disc (6) is slidably disposed inside the connecting bracket (4), and the buffer disc (6) is sleeved on the outer wall of the coupling (5); The buffer disk (6) has several adjustment ports (60) evenly distributed along the axial direction. The connecting bracket (4) is provided with a plurality of limiting strips (40) adapted to the adjustment port (60) at one end near the permanent magnet motor (2), and the limiting strips (40) are adapted to be inserted into the adjustment port (60).

10. The fully enclosed liquid supply pump for a CDU liquid-cooled cabinet as described in claim 9, characterized in that, The axial length of the limiting strip (40) is greater than the axial thickness of the buffer disk (6); An elastic element (61) is provided between the side wall of the buffer plate (6) and the inner wall of the connecting bracket (4). The elastic element (61) is adapted to push the buffer plate (6) to move away from the limiting strip (40).

11. A method for operating a liquid supply pump, characterized in that, The fully enclosed liquid supply pump for CDU liquid-cooled cabinets as described in any one of claims 1-10, the working method comprising: When the permanent magnet motor (2) drives the multi-stage impeller assembly (3) to work, the liquid flows into the stainless steel shell (1) through the inlet (11), and flows through the multi-stage impeller assembly (3), the connecting bracket (4) and the permanent magnet motor (2) in sequence before flowing out through the outlet (12); If the fluid velocity inside the stainless steel shell (1) does not exceed the first velocity, the fluid pushes the buffer plate (6) inside the connecting bracket (4) to move towards the permanent magnet motor (2); If the fluid velocity inside the stainless steel shell (1) exceeds the first velocity, the fluid pushes the buffer plate (6) inside the connecting bracket (4) to move towards the permanent magnet motor (2) until the limit bar (40) is inserted into the adjustment port (60).

Images