Low-voltage water-cooling frequency conversion all-in-one machine

Abstract

The utility model provides a low-voltage water-cooling frequency conversion all-in-one machine which comprises a motor and a frequency converter, the motor comprises a machine base, a circulating water channel is arranged in the machine base, a box body is arranged at the top of the machine base, the top wall of the machine base forms the bottom wall of the box body, and the frequency converter is arranged in the box body and installed on the bottom wall of the box body. The low-pressure water-cooling frequency conversion all-in-one machine is compact in structure, small in overall size and light in weight. Moreover, the frequency converter is not provided with a cooling plate, and is cooled by the circulating water channel in the base, thereby avoiding the blockage problem of the cooling plate due to narrow water channel, reducing the maintenance workload, and improving the cooling effect.

Description

Technical Field

[0001] This application belongs to the field of motor technology, and in particular relates to a low-pressure water-cooled frequency converter integrated machine. Background Technology

[0002] Motors are commonly used electrical components in industrial production. Among them, permanent magnet inverter integrated machines are widely used in industrial production due to their high efficiency and small size. In the existing traditional integrated machine structure, a mounting plate is installed above the motor, and the inverter is mounted on the mounting plate (also called a water-cooled plate). That is, the water-cooled plate is placed between the inverter and the motor housing, meaning the motor and inverter are still essentially two separate parts, not truly integrated. Furthermore, both the motor and the inverter require water cooling. Generally, the inverter has its own cooling system, i.e., water channels are embedded in the water-cooled plate. These channels are connected in series with the water channels inside the housing to form a water supply cooling loop. The motor's cooling water circulates through the housing water channels before entering the cooling plate to cool the inverter. However, because the water channels within the cooling plate are relatively narrow, the water flow and velocity are reduced, and the channels are prone to blockage, thus affecting the overall cooling effect of the water cooling system. Utility Model Content

[0003] To address the aforementioned technical problems in the prior art, this application provides a low-pressure water-cooled inverter integrated machine without a cooling plate to avoid water circuit blockage.

[0004] The technical solution adopted in this application embodiment is: a low-pressure water-cooled variable frequency integrated machine, including a motor and a frequency converter. The motor includes a base, and a circulating water channel is provided inside the base. A box is provided on the top of the base, and the top wall of the base forms the bottom wall of the box. The frequency converter is located inside the box and is installed on the bottom wall of the box.

[0005] In an optional embodiment, the base includes an inner cylinder, a water channel cover, a front end plate, and a rear end plate. The inner cylinder is used to house the rotor shaft, rotor, and stator of the motor. The water channel cover surrounds the outer periphery of the inner cylinder and forms an annular cavity with the inner cylinder. The front end plate and the rear end plate are respectively located at both ends of the inner cylinder in the axial direction to cover the inner cylinder and the annular cavity. The portion of the water channel cover above the rotor shaft is a flat plate and forms the bottom wall of the housing. The circulating water channel is formed in the annular cavity, allowing the cooling water inside to flow along the inner wall surface of the water channel cover.

[0006] In an optional embodiment, the waterway cover includes an arc plate portion, a flat plate portion, and two vertical plate portions. The arc plate portion and the flat plate portion are located below and above the rotor shaft, respectively. The two vertical plate portions are respectively connected to the opposite ends of the arc plate portion and the flat plate portion to form a closed ring.

[0007] In an optional embodiment, a plurality of stiffeners extending along the axial direction of the rotor shaft are spaced apart in the annular cavity, and the two sides of the stiffeners perpendicular to the axial direction of the rotor shaft are respectively connected to the outer wall of the inner cylinder and the inner wall of the water channel cover, so that a circulating water channel is formed between two adjacent stiffeners. A notch is formed between one end of the stiffener and its corresponding end plate to allow cooling water to pass through, and the notches on adjacent stiffeners are staggered.

[0008] In an optional embodiment, the end of the rib with the notch is connected to the front end plate or the rear end plate via a connecting plate near the waterway cover plate, and the notch is formed by the gap between the connecting plate and the outer wall of the inner cylinder.

[0009] In an optional embodiment, the bottom wall of the enclosure is provided with a wiring hole, through which the motor cable passes into the enclosure and connects to the circuit board of the frequency converter; the enclosure wall is provided with an aviation quick-connect connector, and the frequency converter cable is connected to the aviation plug of the aviation quick-connect connector, which is connected to the aviation socket of the aviation quick-connect connector.

[0010] In an optional embodiment, the frequency converter has a heating resistor for heating the housing.

[0011] In an optional embodiment, the box is a closed structure, and the box wall is provided with a vent valve.

[0012] Compared with the prior art, the beneficial effects of the embodiments of this application are as follows: The low-pressure water-cooled inverter integrated machine of this application uses a flat plate portion of the water channel cover for both the inverter and the motor, thus truly integrating the two into one machine, achieving a compact structure, small overall size, and light weight. Moreover, the inverter has no cooling plate and uses the circulating water channel inside the base for cooling, avoiding the clogging problem caused by the narrow water channel of the cooling plate, reducing maintenance workload, and improving cooling effect.

[0013] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this application.

[0014] The overview of various implementations or examples of the technology described in this application is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0015] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The drawings generally illustrate various embodiments by way of example rather than limitation and are used, together with the description and claims, to illustrate the disclosed embodiments. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method.

[0016] Figure 1 This is a perspective view of a low-pressure water-cooled inverter integrated machine according to an embodiment of this application.

[0017] Figure 2 and Figure 3 These are cross-sectional views of the low-pressure water-cooled inverter integrated machine according to embodiments of this application from different perspectives.

[0018] Figure 4 This is a cross-sectional view of the base and housing according to an embodiment of this application.

[0019] Figure 5 This is a schematic diagram of the unfolded circulating water channel according to an embodiment of this application.

[0020] Figure label:

[0021] 1-Motor; 2-Rotor; 3-Stator; 4-Rotor shaft; 5-Inner cylinder; 6-Waterway cover; 7-Flat plate; 8-Arc plate; 9-Vertical plate; 10-First circulating waterway; 11-Second circulating waterway; 12-Inlet; 13-Outlet; 14-Front end plate; 15-Rear end plate; 16-Internal space; 17-Firming rib; 18-Notch; 19-Connecting plate; 20-Cable; 21-Inverter; 22-Box; 23-Cable routing hole; 24-Aerospace quick-connect connector; 25-Base; 26-Ventilation valve. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the described embodiments of this application without creative effort are within the scope of protection of this application.

[0023] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] To keep the following description of the embodiments of this application clear and concise, detailed descriptions of known functions and known components are omitted.

[0025] This application provides a low-pressure water-cooled inverter integrated machine. For example... Figures 1 to 3 As shown, the low-voltage water-cooled variable frequency drive (VFD) unit includes a motor 1 and a VFD 21. The motor 1 is a 380V permanent magnet synchronous motor 1, and includes a rotor 2, a stator 3, and a frame 25. The stator 3 is fitted outside the rotor 2, and both are located within the internal space 16 of the motor 1 enclosed by the frame 25. A circulating water channel is provided inside the frame 25, and a housing 22 is located on the top of the frame 25, with the top wall of the frame 25 forming the bottom wall of the housing 22. The VFD 21 is located inside the housing 22 and mounted on the bottom wall of the housing 22.

[0026] The low-voltage water-cooled inverter integrated machine of this application embodiment removes the water-cooling plate for installing the inverter 21, and directly installs the components of the inverter 21 in the housing 22 above the base 25, so that the components of the inverter 21 are in direct contact with the top wall of the base 25, so as to use the circulating water in the internal circulation channel of the base 25 for cooling. This avoids the problem of water blockage, reduces maintenance, and provides a simple and efficient cooling method. It also truly achieves integrated design, has a compact structure, is easy to debug, has a small overall size, is lightweight, and is convenient for installation and transportation.

[0027] In some embodiments, such as Figure 3 and Figure 4As shown, the base 25 includes an inner cylinder 5, a water channel cover 6, a front end plate 14, and a rear end plate 15. The inner cylinder 5 forms the internal space 16 of the motor 1. The rotor shaft 4, rotor 2, and stator 3 are sequentially fitted from the inside out and are all located within the inner cylinder 5. The water channel cover 6 surrounds the outer periphery of the inner cylinder 5, forming an annular cavity with the inner cylinder 5. The front end plate 14 and rear end plate 15 are respectively located at both ends of the inner cylinder 5 in the axial direction, used to cover the inner cylinder 5 and the annular cavity. The portion of the water channel cover 6 above the rotor shaft 4 is a flat plate 7, forming the bottom wall of the housing 22. Circulating water channels are formed within the annular cavity, allowing cooling water to flow along the inner wall surface of the water channel cover 6. By designing the water channel cover 6, which forms the bottom wall of the housing 22, as a flat plate 7, not only is the installation of the various components of the frequency converter 21 convenient, but the contact area with the water channel cover 6 is also increased, improving the cooling effect.

[0028] In some embodiments, continue to combine Figure 4 The water channel cover 6 includes an arc-shaped plate portion 8, a flat plate portion 7, and two vertical plate portions 9. The arc-shaped plate portion 8 and the flat plate portion 7 are located below and above the opposing rotor shaft 4, respectively. The two vertical plate portions 9 connect the opposite ends of the arc-shaped plate portion 8 and the flat plate portion 7 to form a closed ring. That is, the flat plate portion 7, the vertical plate portion 9, the arc-shaped plate portion 8, and the vertical plate portion 9 are connected end to end in sequence to form a closed non-circular ring. The water channel cover 6 has a reasonable structure, which not only fits the inner cylinder 5 and wraps around its outer perimeter, but also forms the flat plate portion 7, which also serves as the bottom wall of the housing 22. This also makes the distance between the upper part of the inner cylinder 5 and the flat plate portion 7 larger closer to the sides, forming a deeper circulating water channel, resulting in a larger flow of cooling water and better cooling effect on the inverter 21. In order to Figure 4 The deeper circulating waterway is clearly visible and is designated as the first circulating waterway 10, while the other circulating waterways are designated as the second circulating waterway 11.

[0029] like Figure 2 , Figure 4 and Figure 5 As shown, multiple stiffeners 17 extending axially along the rotor shaft 4 are spaced apart within the annular cavity. The two sides of each stiffener 17, perpendicular to the axial direction of the rotor shaft 4, are connected to the outer wall of the inner cylinder 5 and the inner wall of the water channel cover 6, respectively, forming a circulating water channel extending axially along the rotor shaft 4 between adjacent stiffeners 17. One end of each stiffener 17 in the axial direction of the rotor shaft 4 is connected to its corresponding end plate, and the other end forms a notch 18 between itself and its corresponding end plate, allowing cooling water to pass through. The notches 18 of adjacent stiffeners 17 are staggered. This allows cooling water to circulate within the annular cavity between the inner cylinder 5 and the water channel cover 6, flowing over the entire outer wall of the inner cylinder 5 and the inner wall of the water channel cover 6, effectively water-cooling the motor 1 and the frequency converter 21.

[0030] like Figure 1 and Figure 5 As shown, the water channel cover 6 is provided with an inlet 12 and an outlet 13. The outlet 13 and the inlet 12 are arranged close to each other, and the inlet 12 and the outlet 13 are respectively located on both sides of a rib plate 17. The two ends of the rib plate 17 are connected to the front plate 14 and the rear plate 15, respectively. That is, there is no notch 18 on the rib plate 17, so that the water entering from the inlet 12 flows through the entire circulation water channel and then flows through the outlet 13, thus avoiding the water entering from the inlet 12 flowing directly out of the outlet 13, which would affect the cooling effect. Figure 5 The direction of the middle arrow indicates the flow direction of the cooling water.

[0031] Continue to combine Figure 5 The end of the stiffening slab 17 with a notch 18 is connected to the front plate 14 or the rear plate 15 via a connecting plate 19 near the waterway cover plate 6. The notch 18 is formed by the gap between the connecting plate 19 and the outer wall of the inner cylinder 5. In this way, a support point can be provided for the welding of the waterway cover plate 6 to the stiffening slab 17, ensuring the stability of the structure.

[0032] In some embodiments, such as Figure 3 As shown, the bottom wall of the enclosure 22 has a wiring hole 23. The cable 20 of the motor 1 passes through the wiring hole 23 into the enclosure 22 and connects to the circuit board of the frequency converter 21. The enclosure wall of the enclosure 22 has an aviation quick-connect connector 24, which includes an aviation plug and an aviation socket. The cable of the frequency converter 21 is connected to the aviation plug, and the aviation plug is connected to the aviation socket. In this way, the cables 20 of the frequency converter 21 and the motor 1 are all located inside the integrated unit, free from external electromagnetic interference, and will not affect surrounding communication equipment. Moreover, the use of the aviation quick-connect connector 24 facilitates wiring, eliminating the need for frequent opening of the enclosure 22 and end plate for wiring, thus improving the protection level.

[0033] In some embodiments, the inverter 21 is provided with a heating resistor for heating the interior of the enclosure 22. By providing the heating resistor, moisture and condensation inside the enclosure 22 can be prevented when the motor 1 and the inverter 21 are stopped, thus preventing damage to the components of the inverter 21. The heating resistor is connected in parallel with the heating element in the stator 3 of the motor 1 and is connected to an aviation socket on the wall of the enclosure 22.

[0034] In some embodiments, the housing 22 is a closed structure, and a vent valve 26 is provided on the wall of the housing 22. See [link / reference]. Figure 1 and Figure 2 .

[0035] like Figure 1 As shown, the housing 22 can be a cubic structure and have the same width and length as the base 25 of the motor 1, so that the two form a coordinated and unified appearance.

[0036] The low-voltage water-cooled inverter integrated machine of this application embodiment has a cavity-shaped box 22 with the top wall of the box 25 as the bottom wall, which is set above the base 25. The components of the inverter 21 are set on the bottom wall of the box 22 and cooled by cooling water flowing through the bottom wall. This eliminates the need for the original water-cooling plate of the inverter 21, which not only simplifies the structure but also reduces the height of the whole machine, which is conducive to the compactness and miniaturization of the whole machine. It also avoids the clogging problem that exists when installing a water-cooling plate.

[0037] The above description is intended to be illustrative and not restrictive. Those skilled in the art can make variations, modifications, substitutions, and alterations to the above embodiments within the scope of this disclosure. Moreover, the above examples (or one or more of them) can be used in combination with each other, and these embodiments can be combined with each other in various combinations or arrangements.

Claims

1. A low-pressure water-cooled variable frequency integrated machine, comprising a motor and a frequency converter, wherein the motor includes a frame, and the frame is provided with a circulating water channel, characterized in that, The top of the base is provided with a housing, and the top wall of the base forms the bottom wall of the housing. The frequency converter is located inside the housing and is installed on the bottom wall of the housing.

2. The low-pressure water-cooled inverter integrated machine according to claim 1, characterized in that, The base includes an inner cylinder, a water channel cover, a front end plate, and a rear end plate. The inner cylinder is used to house the rotor shaft, rotor, and stator of the motor. The water channel cover surrounds the outer periphery of the inner cylinder and forms an annular cavity with the inner cylinder. The front end plate and the rear end plate are respectively located at both ends of the inner cylinder in the axial direction to cover the inner cylinder and the annular cavity. The portion of the water channel cover above the rotor shaft is a flat plate and forms the bottom wall of the housing. The circulating water channel is formed in the annular cavity, allowing the cooling water inside to flow along the inner wall surface of the water channel cover.

3. The low-pressure water-cooled inverter integrated machine according to claim 2, characterized in that, The waterway cover includes an arc plate portion, a flat plate portion, and two vertical plate portions. The arc plate portion and the flat plate portion are located below and above the rotor shaft, respectively. The two vertical plate portions are respectively connected to the opposite ends of the arc plate portion and the flat plate portion to form a closed ring.

4. The low-pressure water-cooled inverter integrated machine according to claim 2, characterized in that, Multiple stiffeners extending along the axial direction of the rotor shaft are spaced apart inside the annular cavity. The two sides of the stiffeners perpendicular to the axial direction of the rotor shaft are connected to the outer wall of the inner cylinder and the inner wall of the water channel cover, respectively, so that a circulating water channel is formed between two adjacent stiffeners. A notch is formed between one end of the stiffener and its corresponding end plate to allow cooling water to pass through, and the notches on adjacent stiffeners are staggered.

5. The low-pressure water-cooled inverter integrated machine according to claim 4, characterized in that, The end of the rib with the notch is connected to the front end plate or the rear end plate via a connecting plate near the waterway cover plate, and the notch is formed by the gap between the connecting plate and the outer wall of the inner cylinder.

6. The low-pressure water-cooled inverter integrated machine according to claim 1, characterized in that, The bottom wall of the enclosure is provided with a wiring hole, through which the motor cable passes into the enclosure and connects to the circuit board of the frequency converter; the enclosure wall is provided with an aviation quick-connect connector, and the frequency converter cable is connected to the aviation plug of the aviation quick-connect connector, which is connected to the aviation socket of the aviation quick-connect connector.

7. The low-pressure water-cooled inverter integrated machine according to claim 1, characterized in that, The frequency converter has a heating resistor for heating the housing.

8. The low-pressure water-cooled inverter integrated machine according to claim 1, characterized in that, The enclosure is a closed structure, and the enclosure wall is equipped with a vent valve.

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