Motor of air compressor

Abstract

The invention provides a motor of an air compressor. A jet cooling channel in a hollow shaft is arranged to be Y-shaped; by means of the Y-shaped jet cooling channel, the covering and soaking area of cooling oil on the diode is increased, and therefore the cooling effect on the diode is improved. By adjusting the included angles between the two branch pipes of the jet cooling channel and the extension line of the main pipe, the coverage area of the cooling oil on the diode is further increased, so that the cooling effect of the cooling oil on the diode is enhanced, and the wetting area of the cooling oil on the diode is further increased by adjusting the diameters of the main pipe and the branch pipes of the Y-shaped jet cooling channel. The cooling effect is improved, and it is ensured that the cooling device can evenly and fully soak and cool the diode.

Description

Technical Field

[0001] The present invention relates to the technical field of air compressor motors, and particularly to a motor of an air compressor. Background Art

[0002] An air compressor motor is a driving device for a common gas compression device, which has advantages such as high power density, large starting torque, and low noise. It is widely used in pure electric vehicles, hybrid electric vehicles, and electric propulsion systems in aerospace. With the increase in the power density of the motor, its structural design gradually tends to be miniaturized and lightweight, resulting in a higher temperature rise inside the motor. The problem of motor temperature rise has become a key issue in the process of improving the power of the motor. Among them, one of the reasons for the decrease in the service life of the air compressor motor is that the dynamic response performance of the rotating rectifier diode deteriorates rapidly when the temperature is too high, and the motor can no longer work normally.

[0003] In recent years, many scholars at home and abroad have done a lot of useful research on motor cooling. GAI and WANG proposed a method of using a hollow rotating shaft to cool the windings and stator structure inside the motor, and proposed a unilateral oil injection cooling structure for a 35kw in-wheel motor. By directly injecting oil through the hollow shaft into the bearings and end windings for cooling, good cooling effects are achieved and the prediction of the cooling oil flow rate is realized. However, the unilateral hollow shaft oil injection cooling structure has the problem of uneven cooling. However, there is still little research on the cooling of the rotating rectifier diode of the motor at present. And as a key component to ensure the normal and efficient operation of the motor, how to uniformly and sufficiently cool it is the key to extending the service life of the equipment.

[0004] Therefore, there is an urgent need in the market to design a high-power air compressor motor, so that it can uniformly, sufficiently and efficiently cool the diode during operation, in order to solve the technical problem that the dynamic response performance of the rotating rectifier diode deteriorates rapidly when the temperature is too high and the motor can no longer work normally. Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, the present invention provides a motor of an air compressor. By providing a Y-shaped jet cooling channel inside the hollow shaft of the motor, the injection area and angle of the cooling medium are increased, and according to the rotation factor during the operation of the motor, the included angle between the branch pipe and the extension line of the main pipe of the Y-shaped jet channel is set to be unequal, so as to better increase the wetting coverage area of the cooling medium on the diode and improve the cooling effect on the diode.

[0006] The present invention achieves the above technical objectives through the following technical means.

[0007] A motor of an air compressor, a rotating rectifier is installed outside the hollow shaft of the motor, the rotating rectifier includes diodes distributed outside the hollow shaft, and a circulating cooling medium is provided inside the hollow shaft; a plurality of jet cooling channels are provided inside the hollow shaft, the jet cooling channels are in a Y shape, the jet cooling channels include a main pipe and two branch pipes, one end of the main pipe is communicated with the inner side of the hollow shaft, and one ends of the two branch pipes meet and then are communicated with the other end of the main pipe; the other ends of the two branch pipes are aligned with the diode cooling device.

[0008] Furthermore, the two branch pipes are symmetrically distributed on both sides of the center line extended by the main pipe.

[0009] Furthermore, the included angle γ between the two branch pipes is 90-100°.

[0010] Furthermore, the two branch pipes are asymmetrically distributed on both sides of the center line extended by the main pipe.

[0011] Furthermore, the two branch pipes are respectively a first branch pipe and a second branch pipe, and the included angle β between the first branch pipe and the extension line of the main pipe is greater than the included angle α between the second branch pipe and the extension line of the main pipe.

[0012] Furthermore, the included angle γ between the first branch pipe and the second branch pipe is 90-110°; the included angle difference between the included angle α and the included angle β is 10-20°.

[0013] Furthermore, the included angle β between the first branch pipe and the extension line of the main pipe is 55-60°; the included angle α between the second branch pipe and the extension line of the main pipe is 40-50°.

[0014] Furthermore, the diameters of the first branch pipe and the second branch pipe are the same, which is 0.3-0.6 mm.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. For the motor of the air compressor of the present invention, by setting the jet channel in a Y shape, the jet cooling channel includes a main pipe and two branch pipes, one end of the main pipe is communicated with the inner side of the hollow shaft, and one ends of the two branch pipes meet and then are communicated with the other end of the main pipe; the other ends of the two branch pipes are aligned with the diode cooling device, which can increase the wetting area of the cooling oil on the diode and improve the cooling effect.

[0017] 2. For the motor of the air compressor of the present invention, by asymmetrically distributing the two branch pipes on both sides of the center line extended by the main pipe, using the deflection phenomenon of the cooling oil under high-speed rotation, the wetting area is increased, and the cooling effect of the cooling oil on the diode is enhanced.

[0018] 3. For the motor of the air compressor according to the present invention, by defining the angle and the difference in angle between the first branch pipe and the second branch pipe, the coverage area of the cooling oil on the diode can be further increased, ensuring that the cooling device can evenly and fully wet and cool the diode. At the same time, by adjusting the diameters of the main pipe and the branch pipes of the Y-shaped jet channel, the wetting area of the cooling oil on the diode is increased, further improving the cooling effect. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. The drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, it is obvious that other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a three-dimensional view of the motor of the air compressor in the prior art.

[0021] Figure 2 It is a structural diagram of the motor of the air compressor according to the present invention.

[0022] Figure 3 It is a schematic structural diagram of the "Y"-type jet cooling channel according to the present invention.

[0023] Figure 4 It is a simulation diagram of different angles of the branch pipes in Embodiment 1 of the present invention, where a is γ = 90°, b is γ = 100°, and c is γ = 110°.

[0024] Figure 5 It is a simulation diagram of the branch pipes in Embodiment 2 of the present invention, α = 45 degrees, and β = 55 degrees.

[0025] Figure 6 It is a comparison diagram of the wetting areas of Embodiment 1 and Embodiment 2 of the present invention.

[0026] In the figure:

[0027] 1 - Hollow shaft; 2 - Mounting frame; 31 - Main pipe; 32 - First branch pipe; 33 - Second branch pipe; 4 - Diode; α - Angle between the second branch pipe and the extension line of the main pipe; β - Angle between the first branch pipe and the extension line of the main pipe; γ - Angle between the first branch pipe and the second branch pipe. Detailed Embodiment

[0028] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0030] In the present invention, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] As Figure 1 Shown in the figure, a high-power (greater than 75KW) air compressor motor of the prior art includes a hollow shaft 1, and a circulating cooling medium is provided inside the hollow shaft 1; a plurality of rotating rectifiers are installed outside the hollow shaft 1 through a mounting bracket 2, and the ring formed by a plurality of mounting brackets 2 is coaxially arranged with the hollow shaft 1, and at least one diode 4 is installed on each rotating rectifier. In the embodiment, two diodes 4 are installed on one mounting bracket 2; a radial extending "one"-shaped jet cooling channel 3 is provided on the hollow shaft 1 in the prior art, and there is a problem of uneven cooling.

[0032] As Figure 2As shown in the figure, for the motor of the air compressor of the present invention, the jet cooling channel 3 is in a Y shape. The jet channel 3 includes a main pipe and two branch pipes. One end of the main pipe 31 communicates with the inner side of the hollow shaft 1. One ends of the two branch pipes converge and then communicate with the other end of the main pipe 31. The other ends of the two branch pipes are aligned with the diode 4. The cooling medium flowing in the hollow shaft 1 can be shunted from the main pipe of the jet channel 3 to the two branch pipes, and then sprayed onto the diode 4 through the two branch pipes respectively to cool the diode 4. After absorbing heat, the cooling medium flows downward to the bottom of the motor under the action of gravity, flows out through the oil outlet at the bottom of the motor housing, and then is collected by an external circulating cooling medium collection pump for recycling. In this way, the wetting area of the cooling oil on the diode can be increased, and the cooling effect can be improved.

[0033] As Figure 3 shown, for the convenience of description, the two branch pipes are respectively set as the first branch pipe 32 and the second branch pipe 33. The included angle between the first branch pipe 32 and the extension line of the main pipe 31 is β, and the included angle between the second branch pipe 33 and the extension line of the main pipe 31 is α. The included angle between the first branch pipe 32 and the second branch pipe 33 is γ.

[0034] Example 1

[0035] The first branch pipe 32 and the second branch pipe 33 are symmetrically distributed on both sides of the center line extended by the main pipe 31, that is, the included angles between the first branch pipe 32, the second branch pipe 33 and the extension line of the main pipe are equal, that is, at this time α = β, and at this time γ = α + β = 2α = 2β. Compared with the single-port cooling device in the prior art, the Y-shaped jet cooling channel of the present invention can spray the cooling medium at two positions and directions simultaneously, with a larger heat exchange area, which can effectively reduce the temperature of the diode 4 and improve the cooling efficiency. The Y-shaped jet cooling channel also has design flexibility. For a more complex installation layout, its unique design structure can also maintain the operation well and meet more scenario requirements to maximize its performance and cooling efficiency. The included angle γ between the two branch pipes is 90 - 100°. As Figure 4 and Figure 6 the simulation results show, it can be seen that the wetting areas of α = β = 45 degrees and α = β = 50 degrees are similar, but higher than the scheme of α = β = 55 degrees, that is, when the included angle γ between the two branch pipes exceeds 100 degrees, the wetting area will decrease.

[0036] Example 2

[0037] During the actual operation of the motor, there is a large rotational centrifugal force. Figure 2The f direction is the rotation direction of the hollow shaft 1. Due to the influence of rotational centrifugal force, the cooling medium will have an offset in position and direction during the spraying process. Therefore, the two branch pipes are asymmetrically distributed on both sides of the extended center line of the main pipe 31. That is, the included angle β between the first branch pipe 32 and the extended line of the main pipe 31 is greater than the included angle α between the second branch pipe 33 and the extended line of the main pipe 31. The included angle γ between the first branch pipe 32 and the second branch pipe 33 is 90 - 110°; the difference in the included angles between the included angle α and the included angle β is 10 - 20°. The included angle β between the first branch pipe 32 and the extended line of the main pipe 31 is 55 - 60°; the included angle α between the second branch pipe 33 and the extended line of the main pipe 31 is 40 - 50°. According to Figure 5 It can be seen that when there is an angle difference between the two branch pipes of the Y-shaped jet cooling channel 3, more cooling medium can be sprayed onto the surface of the diode. And due to the influence of rotational centrifugal force, the β angle should be kept greater than the α angle, that is, the included angle β between the first branch pipe 32 and the extended line of the main pipe 31 is set to be greater than the included angle α between the second branch pipe 33 and the extended line of the main pipe 31. That is, when β > α and rotating in the f direction, more cooling medium will be sprayed onto the surface of the diode, that is, the wetted area on the diode surface will increase. Since the wetted area is inversely proportional to the highest temperature of the diode, that is, the larger the wetted area on the diode surface, the lower the temperature of the diode.

[0038] Such as Figure 5 and Figure 6 From the simulation results, it can be seen that the wetted areas for α = β = 45 degrees and α = β = 50 degrees are both 18.6 mm 2 , while in Example 2, the wetted area of the scheme with α = 45 degrees and β = 55 degrees reaches 23.8 mm 2 . While the wetted area of the scheme with α = β = 55 degrees in Example 1 is only less than 15 mm 2 . In Example 2, while expanding the range of the included angle γ, the wetted area is increased.

[0039] Based on the above simulation results, it can be obtained that when the included angle γ between the first branch pipe 32 and the second branch pipe 33 is 90 - 110°; and the difference in the included angles between the included angle α and the included angle β is 10 - 20°, the cooling effect on the diode 4 is better. To further obtain more optimized results, when the included angle β between the first branch pipe 32 and the extended line of the main pipe 31 is set to be greater than the included angle α between the second branch pipe 33 and the extended line of the main pipe 31, the included angle β between the first branch pipe 32 and the extended line of the main pipe 31 is set to 55 - 60°; the included angle α between the second branch pipe 33 and the extended line of the main pipe 31 is set to: 40 - 50°. During the rotational operation of the motor, uniform cooling of the rotating rectifier diode can be achieved with less cooling oil distribution.

[0040] On the other hand, in at least one embodiment, the included angle γ between the first branch pipe 32 and the second branch pipe 33 is 100°, the diameters of the two branch pipes are 0.20 mm, 0.30 mm, 0.40 mm, 0.50 mm and 0.60 mm respectively. As the diameters of the two branch pipes increase, the wetting area of the cooling medium on the diode 4 also increases. The larger the diameter of the branch pipe, the better the cooling effect on the diode.

[0041] It should be understood that although this specification is described according to each embodiment, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0042] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A motor for an air compressor, wherein a rotating rectifier is installed outside a hollow shaft (1) of the motor, the rotating rectifier comprises diodes (4) distributed outside the hollow shaft (1), and a cooling medium is circulated in the hollow shaft (1); characterized in that: A plurality of jet cooling channels (3) are provided inside the hollow shaft (1), the jet cooling channels (3) are Y-shaped, and the jet cooling channels (3) include a main pipe (31) and two branch pipes, one end of the main pipe (31) is connected to the inside of the hollow shaft (1), one end of the two branch pipes are connected to the other end of the main pipe (31) after being joined; the other ends of the two branch pipes are aligned with the diode cooling device (4).

2. The motor rotating rectifier diode cooling device of the air compressor according to claim 1, characterized in that: The two branch pipes are symmetrically distributed on both sides of the extended center line of the main pipe (31).

3. The motor rotating rectifier diode cooling device of the air compressor according to claim 2, characterized in that: The included angle γ between the two branch pipes is 90-100°.

4. The motor rotating rectifier diode cooling device of the air compressor according to claim 1, characterized in that: The two branch pipes are asymmetrically distributed on both sides of the extended center line of the main pipe (31).

5. The air compressor motor rotary rectifier diode cooling device according to claim 4, characterized in that: The two branch pipes are respectively a first branch pipe (32) and a second branch pipe (33), and an included angle β between the first branch pipe (32) and an extension line of the main pipe (31) is greater than an included angle α between the second branch pipe (33) and an extension line of the main pipe (31).

6. The air compressor motor rotary rectifier diode cooling device according to claim 5, characterized in that: The included angle γ between the first branch pipe (32) and the second branch pipe (33) is 90 to 110°; the included angle difference between the included angle α and the included angle β is 10 to 20°.

7. The air compressor motor rotary rectifier diode cooling device according to claim 5, characterized in that: The included angle β between the first branch pipe (32) and the extension line of the main pipe (31) is 55 to 60 degrees; the included angle α between the second branch pipe (33) and the extension line of the main pipe (31) is 40 to 50 degrees.

8. The air compressor motor rotary rectifier diode cooling device according to claim 5, characterized in that: The diameter of the first branch pipe (32) is the same as the diameter of the second branch pipe (33), which is 0.3 to 0.6 mm.

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