Aluminum ring liquid cold plate and ring radiator

Abstract

The present invention discloses an aluminum annular liquid cooling plate and an annular radiator with multiple inlets and outlets, which are formed by vacuum brazing. The annular liquid cooling plate includes a first annular liquid cooling plate and a second annular liquid cooling plate with different flow channel types, wherein the first annular liquid cooling plate includes an axial flow channel, and the second annular liquid cooling plate includes an axial flow channel and a circumferential flow. The first annular liquid cooling plate and the second annular liquid cooling plate, whose inlets and outlets are independent and not connected to each other, are spliced ​​together to form an annular radiator. The first annular liquid cooling plate is formed by brazing a first lower flat base plate, a first lower brazing plate, a first groove base plate, a first upper brazing plate, and a first upper flat base plate as a whole. The second annular liquid cooling plate is formed by vacuum brazing a second lower flat base plate, a second lower brazing plate, a first groove base plate, a partition, a second groove base plate, a second upper brazing plate, and a second upper flat base plate as a whole. Compared with existing annular radiators, the present invention has better temperature uniformity and is adjustable in the later stage. It can be arbitrarily combined to form annular radiators of different specifications to adapt to motors with different heating conditions, and the preparation method of the annular liquid cooling plate is simple.

Description

Technical Field

[0001] The present invention relates to the field of aviation liquid cooling and heat dissipation, in particular to an annular liquid cooling plate and an annular radiator formed by vacuum brazing, which are mainly used for cooling motors. Background Art

[0002] Aircraft motors typically use natural heat dissipation or forced air cooling to maintain proper operation. These two traditional cooling methods are limited to situations where the motor generates relatively little heat. As motor heat continues to increase, conventional natural heat dissipation or forced air cooling, due to their low convective heat transfer coefficient, are no longer sufficient. To meet these requirements, fans must be added to provide greater air volume and enhance cooling, which consumes significant space. This clearly contradicts the compactness requirements of the aviation industry.

[0003] On the other hand, traditional annular heat sinks use either axial or circumferential flow channels. Due to the varying flow resistance of the medium, it is difficult to achieve uniform flow of the medium in all channels, resulting in poor temperature uniformity. This is manifested in large temperature differences on the surface of the annular heat sink. Excessive temperature differences can cause stress and deformation, which not only affects the subsequent service life of the heat sink, but also affects the heat dissipation effect and ultimately the stability of the motor. Furthermore, the current annular heat sink is machined as a whole. Once machined, if the heating conditions of the motor change, it cannot be adjusted later and can only be replaced as a whole. Summary of the Invention

[0004] In response to the above-mentioned defects in the prior art, the present invention aims to provide an aluminum annular liquid cooling plate and annular radiator for heat dissipation of motors in the aviation field. Compared with the existing annular radiators, the annular radiators have better temperature uniformity and are adjustable in the later stage. They can be arbitrarily combined to form annular radiators of different specifications to adapt to motors with different heating conditions. The preparation method of the annular liquid cooling plate is simple.

[0005] The technical solutions of the present invention are as follows:

[0006] Aluminum ring liquid cold plate, including,

[0007] a first annular liquid cooling plate, wherein the first annular liquid cooling plate is in the shape of an incomplete cylindrical surface in the circumferential direction, a first liquid inlet and a first liquid outlet are provided on the cylindrical surface of the first annular liquid cooling plate, a first upper liquid collecting chamber and a first lower liquid collecting chamber are provided at the upper and lower ends of the first annular liquid cooling plate, respectively, the first upper liquid collecting chamber and the first lower liquid collecting chamber both extend along the circumference of the cylindrical surface, the first lower liquid collecting chamber is communicated with the first liquid inlet, and the first upper liquid collecting chamber is communicated with the first liquid outlet, a plurality of first medium flow channels are processed in the first annular liquid cooling plate, and the ends of the first medium flow channels are communicated with the first upper liquid collecting chamber and the first lower liquid collecting chamber respectively;

[0008] a second annular liquid-cooling plate, wherein the second annular liquid-cooling plate is in the shape of an incomplete circumferential cylindrical surface, a second liquid inlet and a second liquid outlet are provided on the cylindrical surface of the second annular liquid-cooling plate, a second upper liquid collecting chamber and a second lower liquid collecting chamber are provided at the upper and lower ends of the second annular liquid-cooling plate respectively, the second upper liquid collecting chamber and the second lower liquid collecting chamber both extend along the circumference of the cylindrical surface, the second liquid inlet is communicated with the second lower liquid collecting chamber, the second liquid outlet is communicated with the second upper liquid collecting chamber, at least one circumferential flow channel and a plurality of second medium flow channels are provided between the second upper liquid collecting chamber and the second lower liquid collecting chamber and in the second annular liquid-cooling plate, the circumferential flow channel extends along the circumference of the cylindrical surface, and the circumferential flow channel is communicated with the second medium flow channel;

[0009] When there is only one circumferential flow channel in the second annular liquid cooling plate, the second upper liquid collecting chamber, the second medium flow channel, the circumferential flow channel, the second medium flow channel, and the second lower liquid collecting chamber are arranged in the order of the second upper liquid collecting chamber, the second medium flow channel at both ends being connected to the second upper liquid collecting chamber and the second lower liquid collecting chamber respectively;

[0010] When the second annular liquid cooling plate has multiple circumferential flow channels, the second medium flow channels are arranged along the axis of the cylindrical surface in the order of the second upper liquid collecting chamber, the second medium flow channel, the first circumferential flow channel, the second medium flow channel, the second circumferential flow channel, the second medium flow channel, ... the Nth circumferential flow channel, the second medium flow channel, and the second lower liquid collecting chamber, where N is a natural number. The second medium flow channels at both ends are connected to the second upper liquid collecting chamber and the second lower liquid collecting chamber, respectively.

[0011] The circumferential flow channel is mainly composed of a middle liquid collecting chamber and a middle liquid separating chamber. Both the middle liquid collecting chamber and the middle liquid separating chamber extend along the circumference of the cylindrical surface. The middle liquid collecting chamber and the middle liquid separating chamber are connected by a connecting port. The middle liquid collecting chamber and the middle liquid separating chamber are respectively connected to different second medium flow channels. When there are multiple circumferential flow channels, the projections of different connecting ports on the second upper liquid collecting chamber or the second lower liquid collecting chamber along the axial direction of the cylindrical surface do not overlap.

[0012] Furthermore, the first medium flow channel and the second medium flow channel are channels with equal cross-sections machined inside the first annular liquid cooling plate and the second annular liquid cooling plate by CNC.

[0013] Furthermore, multiple first medium flow channels are parallel to each other in the first annular liquid cooling plate and parallel to the axis direction of the cylindrical surface corresponding to the first annular liquid cooling plate, and multiple second medium flow channels are parallel to each other in the second annular liquid cooling plate and parallel to the axis direction of the cylindrical surface corresponding to the second annular liquid cooling plate.

[0014] Furthermore, the first annular liquid cooling plate includes a first lower flat base plate, a first lower brazing plate, a first trough base plate, a first upper brazing plate and a first upper flat base plate, wherein:

[0015] An upper notch and a lower notch are respectively formed on both end surfaces of the first slot substrate. A first medium flow channel is machined in the first slot substrate. Both ends of the first medium flow channel are connected to the upper notch and the lower notch respectively. A first liquid inlet and a first liquid outlet are provided on the surface of the first slot substrate.

[0016] The first upper brazing plate, the first upper flat base plate and the upper notch form a first upper liquid collecting chamber;

[0017] The first lower brazing plate, the first lower flat base plate and the lower notch form a first lower liquid collecting chamber.

[0018] Furthermore, the first lower flat base plate, the first lower brazing plate, the first trough base plate, the first upper brazing plate and the first upper flat base plate are brazed together to form a first annular liquid cooling plate.

[0019] Furthermore, the second annular liquid cooling plate includes a second lower flat base plate, a second lower brazing plate, at least two groove base plates, at least one partition plate, a second upper brazing plate and a second upper flat base plate, wherein:

[0020] An upper notch and a lower notch are respectively formed on both end surfaces of the trough substrate. A second medium flow channel is processed in the trough substrate. Both ends of the second medium flow channel are connected to the upper notch and the lower notch respectively. The second liquid inlet and the second liquid outlet are respectively arranged on different surfaces of the trough substrate.

[0021] The second upper brazing plate, the second upper flat base plate and the upper notch form a second upper liquid collecting chamber;

[0022] The second lower flat base plate, the second lower brazing plate and the lower notch form a second lower liquid collecting chamber;

[0023] Two adjacent trough base plates are butted against each other, and a middle liquid collecting chamber and a middle liquid separating chamber are formed respectively through the upper notch and the lower notch on the butting end surface and the partition plate, and a communicating hole is opened on the partition plate.

[0024] Furthermore, the second lower flat base plate, the second lower brazing plate, at least two trough base plates, at least one partition plate, the second upper brazing plate and the second upper flat base plate are connected by brazing to form a second annular liquid cooling plate.

[0025] Furthermore, the liquid inlet and outlet on the surface of the first annular liquid cooling plate are located on the same axial section, and this section is located in the middle of the first annular liquid cooling plate. The axial section here refers to a plane that is parallel to the axis of the first annular liquid cooling plate and the axis of the first annular liquid cooling plate is contained in this plane. Therefore, the liquid inlet and outlet are both located in this plane. The middle position refers to the position of the mid-section plane where the axial section divides the first annular liquid cooling plate into two symmetrical parts, thereby reducing uneven medium flow distribution caused by flow resistance and improving temperature uniformity.

[0026] Aluminum ring radiator, including,

[0027] at least one first annular liquid cooling plate;

[0028] at least one second annular liquid cooling plate;

[0029] The liquid working medium between the first annular liquid cooling plate and the second annular liquid cooling plate is not connected, and when the first annular liquid cooling plate and the second annular liquid cooling plate are spliced ​​together, a complete, cylindrical annular radiator is formed.

[0030] Furthermore, the number, cross-sectional shape, and flow channel spacing of the first medium flow channels in the first annular liquid cooling plate are different from the number, cross-sectional shape, and flow channel spacing of the second medium flow channels in the second annular liquid cooling plate.

[0031] Furthermore, the lengths and cross-sectional shapes of the multiple circumferential flow channels in the second annular liquid cooling plate are different.

[0032] Compared with the prior art, the present invention has the following advantages and characteristics:

[0033] (1) The present invention changes the existing single design concept of the annular radiator in which the fluid flows either axially or circumferentially. It adopts a combination of axial flow and circumferential flow to change the flow distribution resistance of the medium, which is beneficial to reducing the surface temperature difference of the annular radiator, improving temperature uniformity, and avoiding problems such as local overheating, radiator deformation caused by large temperature differences, and uneven heat dissipation.

[0034] (2) The present invention can form a complete annular radiator by splicing different types of flow channels and different numbers of annular liquid cooling plates, thereby constructing annular radiators with different heat dissipation efficiencies. This is flexible and changeable. For example, if it is found during use that the existing annular radiator cannot meet actual needs, only part of it needs to be removed, replaced with another type of annular liquid cooling plate, and then reassembled, without having to replace the entire annular radiator.

[0035] (3) In the present invention, each annular liquid cooling plate has an independent liquid inlet and outlet, so that the same annular radiator can use different heat exchange media, further improving temperature uniformity and adjustability;

[0036] (4) In the present invention, the ratio of the heat exchange area of ​​the annular radiator occupied by different types of annular liquid cooling plates can be changed to meet the needs of different occasions;

[0037] (5) In the present invention, multiple circumferential flow channels (middle liquid collecting chamber + middle liquid separating chamber) can be formed at different positions by brazing according to the heat exchange requirements, thereby changing the heat exchange mode at the corresponding positions from a single forward flow or countercurrent flow to forward flow + cross flow or countercurrent + cross flow, thereby improving the heat exchange efficiency;

[0038] (6) In the present invention, multiple independent areas with different heat transfer efficiencies are formed in the same heat exchange radiator, for example, by splicing three or more annular liquid cooling plates of different specifications (number, position, cross-sectional shape, etc. of circumferential flow channels, density, number, cross-sectional shape, etc. of axial flow channels);

[0039] (7) In the present invention, the circumferential flow channel and the annular liquid cooling plate are formed by integral brazing. The forming method is quick and simple and does not involve complicated processing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the overall assembly of an annular radiator formed by splicing a first annular liquid cooling plate and a second annular liquid cooling plate in the present invention;

[0041] Figure 2 is an exploded schematic diagram of the first annular liquid cooling plate of the present invention;

[0042] Figure 3 is a schematic diagram of the first medium flow channel inside the first annular liquid cooling plate of the present invention;

[0043] Figure 4 is an exploded schematic diagram of the second annular liquid cooling plate of the present invention;

[0044] Figure 5 is a schematic diagram of the second medium flow channel inside the second annular liquid cooling plate of the present invention;

[0045] Figure 6 is an exploded view of the annular radiator of the present invention;

[0046] In the figure, 1 is the first annular liquid-cooling plate; 2 is the second annular liquid-cooling plate; 11 is the first lower flat base plate; 12 is the first lower brazing plate; 13 is the first trough base plate; 14 is the first upper brazing plate; 15 is the first upper flat base plate; 16 is the first liquid inlet; 17 is the first liquid outlet; 21 is the second lower flat base plate; 22 is the second lower brazing plate; 25 is the trough base plate; 24 is the partition plate; 26 is the second upper brazing plate; 27 is the second upper flat base plate; 28 is the second liquid inlet; 29 is the second liquid outlet; 30 is the connecting port. DETAILED DESCRIPTION

[0047] In this embodiment, a vacuum brazed double-inlet and double-outlet annular liquid cooling plate and an annular radiator assembled with the annular liquid cooling plate are designed. Figure 6There are mainly two types of annular liquid cooling plates, including a first annular liquid cooling plate 1 and a second annular liquid cooling plate 2. The annular liquid cooling plate is made of aluminum. The annular liquid cooling plate has two liquid inlets and two liquid outlets. When working, the inner surface of the annular liquid cooling plate is wrapped around the outer surface of the motor. At this time, the heat is transferred to the inner wall of the annular liquid cooling plate and finally carried away by the cooling medium flowing through the annular liquid cooling plate. Among them, the first annular liquid cooling plate 1 is formed as a whole by a first lower flat base plate 11, a first lower brazing plate 12, a first groove base plate 13, a first upper brazing plate 14, and a first upper flat base plate 15 through a single vacuum brazing process. When working, the fluid flows in from the first liquid inlet 16 and flows out from the first liquid outlet 17. The second annular liquid cooling plate 2 is formed as a whole by a second lower flat base plate 21, a second lower brazing plate 22, a first groove base plate 25, a partition 24, a second groove base plate 25, a second upper brazing plate 26, and a second upper flat base plate 27 through a single vacuum brazing process. During operation, the fluid flows in from the second liquid inlet 28 , flows into the tank base plate 25 through the communication port 30 , and finally flows out through the second liquid outlet 29 .

[0048] Annular liquid cooling plates are primarily formed by vacuum brazing. Compared to conventional stir welding, this process requires a single weld, resulting in a relatively simple welding process. For example, using stir welding for the first annular liquid cooling plate 1, two separate stir welding processes are required: the first lower flat base plate 11 and the first trough base plate 13, and the first upper flat base plate 15 and the first trough base plate 13. For the second annular liquid cooling plate 2, vacuum brazing is the only option; conventional stir welding is not possible.

[0049] The operating principle of the first annular liquid cooling plate 1 is as follows: the lower surface of the first trough base plate 13, the first lower flat base plate 11, and the first lower brazing plate 12 are vacuum brazed to form a lower liquid collection chamber. The upper surface of the first trough base plate 13, the first upper brazing plate 14, and the first upper flat base plate 15 are vacuum brazed to form an upper liquid collection chamber. During operation, fluid flows in through the first liquid inlet 16, disperses evenly within the lower liquid collection chamber corresponding to the first trough base plate 13, then flows upward in a "fountain" pattern through the axial first medium flow channel (i.e., flowing upward through multiple parallel flow channels) into the upper liquid collection chamber, where it converges and flows out through the first liquid outlet 17.

[0050] The working principle of the second annular liquid cooling plate is as follows: the lower surface of the first trough substrate 25, the second lower flat substrate 21, and the second lower brazing plate 22 are vacuum brazed to form a lower liquid collecting chamber, and the upper surface of the first trough substrate 25 and the partition 24 are vacuum brazed to form a middle liquid collecting chamber; the partition 24 and the lower surface of the second trough substrate 25 are vacuum brazed to form a middle liquid separation chamber, wherein the middle liquid collecting chamber and the middle liquid separation chamber are connected only by the connecting port 30, and the partition 24 is a double-sided composite plate with solder of 0.3 to 1.2 mm; the upper surface of the second trough substrate 25, the second upper brazing plate 26, and the second upper flat substrate 27 are vacuum brazed to form an upper liquid collecting chamber. During operation, the fluid enters the lower liquid collection chamber through the second liquid inlet 28, diffuses in the lower liquid collection chamber, flows into the middle liquid collection chamber through the axial second medium flow channel, and then flows into the middle liquid separation chamber through the connecting port 30. After diffusing in the middle liquid separation chamber, it flows into the upper liquid collection chamber through the axial second medium flow channel in the second groove base plate 25, and finally flows out through the second liquid outlet 29. This structural design enables the cooling medium to flow in both the axial and circumferential directions of the annular cold plate. In addition, the number of groove base plates 25 and partitions 24 can be increased as needed to form multiple circumferential flow channels, thereby achieving the function of continuously changing the flow direction across the entire annular surface. The flow channel design in this embodiment breaks the conventional flow pattern of annular heat sinks, which can only flow in the axial direction or the circumferential direction. When the medium inlet and outlet of the second annular liquid cooling plate 2 are axially aligned, if the medium flows only in the axial direction, the medium flow rate in the flow channels near the inlet and outlet is higher, while the medium flow channels farther away from the inlet and outlet will receive less flow due to excessive resistance. This will cause the surface temperature of the liquid cooling plate farther away from the inlet and outlet to be too high, resulting in poor temperature uniformity across the entire liquid cooling plate. By switching the second annular liquid cooling plate 2 to a combination of axial and circumferential flow channels, the medium flow direction is changed, forcing the fluid to flow farther away from the inlet and outlet, thereby improving the temperature uniformity of the liquid cooling plate.

[0051] In summary, the main structural design and molding ideas of the annular radiator in the present invention are as follows:

[0052] First, the annular radiator is not a monolithic structure, but is composed of annular liquid cooling plates with different flow channel types. The media flow between the annular liquid cooling plates with different flow channel types is not connected, that is, they are not related and are independent of each other. For example, in this embodiment, it is composed of a first annular liquid cooling plate 1 with an axial flow channel and a second annular liquid cooling plate 2 with both axial and circumferential flow channels. The medium in the first annular liquid cooling plate 1 will not flow into the second annular liquid cooling plate 2, and the medium in the second annular liquid cooling plate 2 will not flow into the first annular liquid cooling plate 1.

[0053] Second, in the annular radiator, the central collecting chamber and the central separating chamber form a circumferential flow channel, and the first medium flow channel and the second medium flow channel form an axial flow channel. This circumferential + axial combination can form different forms of heat exchange such as counterflow, smooth flow or cross flow;

[0054] Third, each annular liquid cooling plate that makes up the annular radiator is equipped with at least one liquid inlet and one liquid outlet, allowing for independent management and control. This allows for separate adjustments when using different cooling media or adjusting the temperature of different areas of the annular radiator without interfering with each other.

[0055] Fourth, the heat exchange area ratio of cold plates of different flow channel types in the annular radiator can be adjusted according to the heating characteristics of the motor to improve the heat exchange efficiency. For example, if the temperature distribution in the area where heat exchange is required is uneven, the area of ​​the second annular liquid cooling plate 2 can be increased (which can be understood as increasing the arc circumference of the first annular liquid cooling plate 1 in a complete circle), and at the same time, a middle liquid separation chamber and a middle liquid collection chamber can be added to the corresponding area with higher temperature.

[0056] Fifth, for occasions with high requirements for temperature uniformity, multiple annular liquid cooling plates are used for splicing, such as two first annular liquid cooling plates 1 and three second annular liquid cooling plates 2, which are spliced ​​alternately (one first annular liquid cooling plate 1, then adjacent to another second annular liquid cooling plate 2). The difference in heat exchange efficiency between the two types of liquid cooling plates is utilized to make the temperature field uniform. Furthermore, the purpose of uniform temperature can be achieved by introducing different heat exchange media and changing the density and cross-sectional shape of the flow channel.

[0057] In the present invention, the main structures and forming methods of the annular radiator are as follows:

[0058] Axial flow channel: a channel machined inside the first annular liquid cooling plate 1 and the second annular liquid cooling plate 2;

[0059] Circumferential flow channel: two groove base plates 25 are butted together at their end faces with notches, and partition plates 24 are added to the butting faces to form a middle liquid separation chamber and a middle liquid collection chamber;

[0060] Upper liquid collecting chamber and lower liquid collecting chamber: slots are opened on the end faces of the first slot substrate 13 and the slot substrate 25, and a liquid collecting cavity is formed after being sealed by the first lower brazing plate 12, the first upper brazing plate 14, the second lower brazing plate 22, and the second upper brazing plate 26. The liquid inlet and the liquid outlet are both arranged on the outer surface of the slot substrate 25 or the first slot substrate 13, and the axial flow (the first medium flow channel and the second medium flow channel) are both connected to the upper liquid collecting chamber and the lower liquid collecting chamber.

[0061] Below, combined with the instructions Figures 1 to 5 The concept and design intention of the present invention are further explained.

[0062] like Figures 1 to 6As shown, an annular radiator is composed of two annular liquid cooling plates, the two cold plates are respectively the first annular liquid cooling plate 1 and the second annular liquid cooling plate 2. The first annular liquid cooling plate 1 and the second annular liquid cooling plate 2 are both cylinders with 1 / 2 circumference, which are spliced ​​and fixed along the splicing surface to form a complete cylindrical annular radiator. For ease of understanding, the first annular liquid cooling plate 1 and the second annular liquid cooling plate 2 can also be regarded as using a plane passing through the axis of the annular radiator to cut the complete annular radiator into multiple parts, each part corresponding to an annular liquid cooling plate. The first annular liquid cooling plate 1 and the second annular liquid cooling plate 2 are independent flow fields. During assembly, clamps are used to fasten the first annular liquid cooling plate 1 and the second annular liquid cooling plate to the outer surface of the motor.

[0063] like Figure 1 As shown, the liquid-cooled annular radiator is mainly composed of a left liquid cooling plate 1 and a right liquid cooling plate 2. The annular radiator has two inlets at the bottom (respectively, a first liquid inlet 16 and a second liquid inlet 28) and two outlets at the top (respectively, a first liquid outlet 17 and a second liquid outlet 29).

[0064] like Figure 2 As shown, the first annular liquid cooling plate 1 comprises a first lower flat base plate 11, a first lower brazing plate 12, a first trough base plate 13, a first upper brazing plate 14, and a first upper flat base plate 15. The first annular liquid cooling plate 1 is vacuum brazed together by the first lower brazing plate 12 and the first upper brazing plate 14. Slots are provided on the upper and lower axial end surfaces of the first trough base plate 13 to form the upper and lower liquid collection chambers.

[0065] like Figure 3 As shown, the first medium flow channel within the first annular liquid cooling plate 1 is a CNC-machined circular hole. It has an upper and lower liquid collection chamber, each with a groove depth of 20mm and a width of 6mm. The first medium flow channel forms a "fountain" pattern along the axial direction, with multiple first medium flow channels arranged in parallel and spaced apart, parallel to the axis of the annular radiator, achieving good flow distribution.

[0066] like Figure 4 As shown, the second annular liquid cooling plate 2 is integrally formed by a single vacuum brazing process: a second lower flat base plate 21, a second lower brazing plate 22, a first trough base plate 25, a partition plate 24, a second trough base plate 25, a second upper brazing plate 26, and a second upper flat base plate 27. During operation, fluid flows into the second liquid inlet 28 on the surface of the first trough base plate 25, flows into the second trough base plate 25 through the connecting port 30, and finally flows out through the second liquid outlet 29 on the surface of the second trough base plate 25.

[0067] like Figure 5As shown, the second medium flow channel within the second annular liquid cooling plate 2 is a CNC-machined circular hole. The second annular liquid cooling plate 2 has a lower plenum, a middle plenum, a middle splitter, a connecting port 30, and an upper plenum. The lower plenum has a groove depth of 25 mm and a groove width of 6 mm, while the middle plenum and middle splitter have groove depths of 10 mm and a groove width of 6 mm. The upper plenum has a groove depth of 25 mm and a groove width of 6 mm. Fluid flows axially in the second medium flow channel within the first and second plenum base plates 25, respectively, but flows circumferentially within the middle plenum, the connecting port 30, and the middle splitter.

[0068] Traditional annular radiators are basically air-cooled radiators (heat-conducting fins are machined on the outer surface for natural heat dissipation). The present invention uses liquid cooling. Compared with traditional air cooling, first, the heat transfer coefficient of liquid cooling is ten times or even dozens of times higher than that of air cooling; second, since the present invention uses liquid cooling, there are no external heat dissipation ribs, so it takes up less space and is more compact.

[0069] For the annular radiator, the medium inlet and outlet are designed in a vertical direction along the axial direction. If it is arranged in a conventional axial flow, the medium will be distributed to the other side away from the inlet and outlet. Less medium will be distributed, resulting in a higher surface temperature of the liquid cooling plate away from the inlet and outlet. Figure 1 Taking the annular radiator in [1] as an example, simulation analysis shows that, under the conditions of a 0.5 kW heat transfer rate applied to the inner surface and an inlet flow rate of 15 L / min, if the number and size of circular channels within the annular liquid cooling plate are uniform, the difference between the maximum and minimum surface temperatures of a conventional annular liquid cooling plate with axial flow is 10.78°C. However, using the second annular liquid cooling plate 2 of the present invention, the difference between the maximum and minimum surface temperatures is 5.85°C. This demonstrates that the annular liquid cooling plate of the present invention has better temperature uniformity, as detailed in Table 1 below. This second annular liquid cooling plate 2 with improved temperature uniformity can be combined with the first annular liquid cooling plate 1 and is particularly suitable for applications where heat generation varies at different locations on the motor but where high overall temperature uniformity is required.

[0070] Table 1

[0071]

[0072] The above embodiments are not intended to limit the protection scope of the present invention. Any variations, modifications or equivalent substitutions made on the basis of the technical solution of the present invention shall fall within the protection scope of the present invention.

Claims

1. Aluminum ring radiator, characterized by: include, At least one first annular liquid cooling plate (1); At least one second annular liquid cooling plate (2); The first annular liquid cooling plate (1) is in the shape of a circumferentially incomplete cylindrical surface. A first liquid inlet (16) and a first liquid outlet (17) are provided on the cylindrical surface of the first annular liquid cooling plate (1). A first upper liquid collecting chamber and a first lower liquid collecting chamber are provided at the upper and lower ends of the first annular liquid cooling plate (1), respectively. The first upper liquid collecting chamber and the first lower liquid collecting chamber both extend along the circumference of the cylindrical surface. The first lower liquid collecting chamber is connected to the first liquid inlet (16), and the first upper liquid collecting chamber is connected to the first liquid outlet (17). A plurality of first medium flow channels are processed in the first annular liquid cooling plate (1), and the two ends of the first medium flow channels are connected to the first upper liquid collecting chamber and the first lower liquid collecting chamber, respectively. The second annular liquid cooling plate (2) is in the shape of a circumferentially incomplete cylindrical surface. A second liquid inlet (28) and a second liquid outlet (29) are provided on the cylindrical surface of the second annular liquid cooling plate (2). A second upper liquid collecting chamber and a second lower liquid collecting chamber are provided at the upper and lower ends of the second annular liquid cooling plate (2), respectively. The second upper liquid collecting chamber and the second lower liquid collecting chamber both extend along the circumference of the cylindrical surface. The second liquid inlet (28) is communicated with the second lower liquid collecting chamber, and the second liquid outlet (29) is communicated with the second upper liquid collecting chamber. At least one circumferential flow channel and a plurality of second medium flow channels are provided between the second upper liquid collecting chamber and the second lower liquid collecting chamber and in the second annular liquid cooling plate (2). The circumferential flow channel extends along the circumference of the cylindrical surface and is communicated with the second medium flow channel. When there is only one circumferential flow channel in the second annular liquid cooling plate (2), the second upper liquid collecting chamber, the second medium flow channel, the circumferential flow channel, the second medium flow channel and the second lower liquid collecting chamber are arranged in the order of the second upper liquid collecting chamber, the second medium flow channel at both ends are respectively connected to the second upper liquid collecting chamber and the second lower liquid collecting chamber; When there are multiple circumferential flow channels in the second annular liquid cooling plate (2), the second medium flow channels are arranged in the order of the second upper liquid collecting chamber, the second medium flow channel, the first circumferential flow channel, the second medium flow channel, the second circumferential flow channel, the second medium flow channel, ... the Nth circumferential flow channel, the second medium flow channel and the second lower liquid collecting chamber along the axial direction of the cylindrical surface, where N is a natural number, and the second medium flow channels at both ends are connected to the second upper liquid collecting chamber and the second lower liquid collecting chamber respectively; The circumferential flow channel is mainly composed of a middle liquid collecting chamber and a middle liquid separating chamber, both of which extend along the circumference of the cylindrical surface. The middle liquid collecting chamber and the middle liquid separating chamber are connected via a connecting port (30), and the middle liquid collecting chamber and the middle liquid separating chamber are respectively connected to different second medium flow channels. When there are multiple circumferential flow channels, the projections of different connecting ports (30) on the second upper liquid collecting chamber or the second lower liquid collecting chamber along the axial direction of the cylindrical surface do not overlap. The liquid working medium between the first annular liquid cooling plate (1) and the second annular liquid cooling plate (2) is not connected, and when at least one first annular liquid cooling plate (1) and at least one second annular liquid cooling plate (2) are spliced ​​together, a complete, cylindrical annular radiator is formed.

2. The aluminum ring radiator according to claim 1, characterized in that: The number, cross-sectional shape, and flow channel spacing of the first medium flow channels in the first annular liquid cooling plate (1) are different from the number, cross-sectional shape, and flow channel spacing of the second medium flow channels in the second annular liquid cooling plate (2).

3. The aluminum ring radiator according to claim 1, characterized in that: The lengths and cross-sectional shapes of the multiple circumferential flow channels in the second annular liquid cooling plate (2) are different.

4. The aluminum ring radiator according to claim 1, characterized in that: The first medium flow channel and the second medium flow channel are channels of equal cross-section machined inside the first annular liquid cooling plate (1) and the second annular liquid cooling plate (2) by CNC.

5. The aluminum ring radiator according to claim 1, characterized in that: A plurality of the first medium flow channels are parallel to each other in the first annular liquid cooling plate (1) and parallel to the axis direction of the cylindrical surface corresponding to the first annular liquid cooling plate (1); a plurality of the second medium flow channels are parallel to each other in the second annular liquid cooling plate (2) and parallel to the axis direction of the cylindrical surface corresponding to the second annular liquid cooling plate (2).

6. The aluminum ring radiator according to claim 1, characterized in that: The first annular liquid cooling plate (1) comprises a first lower flat base plate (11), a first lower brazing plate (12), a first groove base plate (13), a first upper brazing plate (14) and a first upper flat base plate (15), wherein: The first slot substrate (13) has upper and lower slots formed on both end surfaces thereof, respectively. A first medium flow channel is machined in the first slot substrate (13), with both ends of the first medium flow channel communicating with the upper and lower slots, respectively. A first liquid inlet (16) and a first liquid outlet (17) are provided on the surface of the first slot substrate (13). The first upper brazing plate (14), the first upper flat base plate (15) and the upper notch form a first upper liquid collecting chamber; The first lower brazing plate (12), the first lower flat base plate (11) and the lower notch form a first lower liquid collecting chamber.

7. The aluminum ring radiator according to claim 6, characterized in that: The first lower flat base plate (11), the first lower brazing plate (12), the first groove base plate (13), the first upper brazing plate (14) and the first upper flat base plate (15) are brazed together to form a first annular liquid cooling plate (1).

8. The aluminum ring radiator according to claim 1, characterized in that: The second annular liquid cooling plate (2) comprises a second lower flat base plate (21), a second lower brazing plate (22), at least two groove base plates (25), at least one partition plate (24), a second upper brazing plate (26) and a second upper flat base plate (27), wherein: An upper notch and a lower notch are respectively formed on both end surfaces of the groove substrate (25); a second medium flow channel is machined in the groove substrate (25); both ends of the second medium flow channel are respectively connected to the upper notch and the lower notch; a second liquid inlet (28) and a second liquid outlet (29) are respectively provided on different surfaces of the groove substrate (25); The second upper brazing plate (26), the second upper flat base plate (27) and the upper notch form a second upper liquid collecting chamber; The second lower flat base plate (21), the second lower brazing plate (22) and the lower notch form a second lower liquid collecting chamber; Two adjacent trough base plates (25) are butted against each other, and the upper notch and the lower notch on the butting end surface form a middle liquid collecting chamber and a middle liquid separating chamber respectively with the partition plate (24), and a communication port (30) is opened on the partition plate (24).

9. The aluminum ring radiator according to claim 8, characterized in that: The second lower flat base plate (21), the second lower brazing plate (22), at least two groove base plates (25), at least one partition plate (24), the second upper brazing plate (26) and the second upper flat base plate (27) are connected by brazing to form a second annular liquid cooling plate (2).

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