A heat dissipation system for a permanent magnet direct drive crane

Abstract

A heat dissipation system for a permanent magnet direct drive crane includes a water-cooled permanent magnet direct drive drum and a heat exchange device. The heat exchange device includes a duct, inside which multiple horn-shaped air guide shrouds are spaced axially. The large-diameter end of the air guide shroud is fixedly connected to the inner wall of the duct, and the diameter of the large-diameter end of the air guide shroud is smaller than the inner diameter of the duct. The small-diameter end of one of two adjacent air guide shrouds is inserted into the large-diameter end of the adjacent air guide shroud. The large-diameter end of the air guide shroud is provided with an annular heat exchange busbar that allows cooling medium to flow, and two adjacent annular heat exchange busbars are connected in series. The cooling pipes of the water-cooled permanent magnet direct drive drum are connected to the annular heat exchange busbars via a circulating pump. A cooling fan is provided inside the small-diameter end of the air guide shroud. This invention has a compact structure, good heat dissipation effect, and ingenious and reasonable layout, which can greatly reduce the volume compared with traditional heat dissipation towers.

Description

Technical Field

[0001] This invention relates to the field of crane technology, and in particular to a heat dissipation system for a permanent magnet direct drive crane. Background Technology

[0002] In the crane industry, water-cooled permanent magnet direct drive drums are becoming increasingly popular because they can further reduce the structural size of lifting equipment, simplify the structure, and facilitate maintenance. However, to ensure the reliability and safety of water-cooled permanent magnet direct drive drums, efficient heat dissipation devices are required to prevent overheating. Considering that some lifting equipment needs to be moved frequently, most water-cooled permanent magnet direct drive drums on the market use air cooling. However, the effect of air cooling is not ideal, often requiring shutdown to wait for the permanent magnet direct drive drum to cool down, which affects the user experience.

[0003] Chinese patent (publication number: CN213416089U) discloses a heat dissipation device for electric hoists of double-girder cranes. This patent provides an auxiliary heat dissipation device by setting an auxiliary heat dissipation device at the front right side of the top surface of the base plate. The user fixes the fixing mechanism to the bottom of the fixing seat, and the motor drives the reciprocating mechanism to move to the left through the transmission mechanism. In turn, the reciprocating mechanism drives the fan to move to the left, thereby dissipating heat from the entire electric hoist. The heat dissipation structure is relatively large in size and requires the generation of high-speed airflow to achieve a good heat dissipation effect, which results in a lot of noise during operation. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention discloses a heat dissipation system for permanent magnet direct drive cranes.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0006] A heat dissipation system for a permanent magnet direct drive crane includes a water-cooled permanent magnet direct drive drum and a heat exchange device. The heat exchange device includes a duct, inside which multiple horn-shaped air guide shrouds are spaced axially. The large-diameter end of the air guide shroud is fixedly connected to the inner wall of the duct, and the diameter of the large-diameter end of the air guide shroud is smaller than the inner diameter of the duct. The small-diameter end of one of two adjacent air guide shrouds is inserted into the large-diameter end of the adjacent air guide shroud. The large-diameter end of the air guide shroud is provided with an annular heat exchange busbar that allows cooling medium to flow, and two adjacent annular heat exchange busbars are connected in series. The cooling pipes of the water-cooled permanent magnet direct drive drum are connected to the annular heat exchange busbars via a circulating pump. A cooling fan is provided inside the small-diameter end of the air guide shroud.

[0007] Preferably, the water-cooled permanent magnet direct-drive drum includes a stator winding and a drum housing rotatably connected to the stator winding. The inner wall of the drum housing is provided with a cooling coil. Both ends of the main shaft of the stator winding are provided with transition devices corresponding to and connected to the heat exchange device. The transition device includes a hollow disk coaxially and rigidly connected to the main shaft of the stator winding. A hollow turntable is rotatably connected to the outside of the hollow disk. The hollow turntable is rigidly connected to the drum housing, and the hollow turntables are correspondingly connected to each other. The water inlet and water outlet of the cooling coil are respectively connected to the hollow turntables at both ends of the stator winding. The hollow disks at both ends of the stator winding are respectively connected to the water inlet and water outlet of the heat exchange device.

[0008] Preferably, the main shaft of the stator winding is a hollow shaft, with its two ends respectively connected to the water inlet and water outlet of the heat exchange device.

[0009] Preferably, multiple air guide plates are arranged at intervals along the inner circumferential direction at the large diameter end of the air guide shroud.

[0010] Preferably, the air guide plate is spirally arranged along the axial direction of the air guide cover.

[0011] Preferably, the small-diameter end of the air guide shroud has a smooth tapering structure.

[0012] Preferably, fans are provided at both ends of the air duct.

[0013] Preferably, the air inlet end of the air duct is detachably connected to a filter screen, and the air outlet end is detachably connected to a protective mesh cover.

[0014] By employing the technical solution described above, the present invention has the following beneficial effects:

[0015] This invention discloses a heat dissipation system for a permanent magnet direct-drive crane, which has a compact structure, good heat dissipation effect, and ingenious and reasonable layout. Compared with traditional heat dissipation towers, it can greatly reduce the volume. The heat exchange device includes a wind duct, and multiple horn-shaped air guides are arranged axially along the wind duct. The cooling fan in the air guide can generate high-speed airflow, which is guided by the outer wall of the small diameter end of the adjacent air guide and blown towards the annular heat exchanger. The airflow passing through the annular heat exchanger can be directly discharged along the wind duct under the guidance of the outer wall of the large diameter end of the adjacent air guide, without exchanging heat with the adjacent annular heat exchanger. That is, the airflow that exchanges heat with the annular heat exchanger is all cold air that enters from the air inlet, resulting in high heat dissipation efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the heat exchange device.

[0018] Figure 3 This is a side view of the heat exchanger.

[0019] Figure 4 This is a schematic diagram of the structure of a water-cooled permanent magnet direct-drive drum.

[0020] In the diagram: 1. Water-cooled permanent magnet direct-drive drum; 1-1. Stator winding; 1-2. Drum housing; 1-3. Cooling coil; 1-4. Hollow disc; 1-5. Hollow turntable; 2. Heat exchange device; 2-1. Air duct; 2-2. Air guide shroud; 2-3. Annular heat exchanger; 2-4. Cooling fan; 2-5. Air guide plate; 2-6. Fan. Detailed Implementation

[0021] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation.

[0022] Example 1, in conjunction with Appendix Figures 1-3 A heat dissipation system for a permanent magnet direct-drive crane includes a water-cooled permanent magnet direct-drive drum 1 and a heat exchange device 2. The heat exchange device 2 includes a duct 2-1, within which multiple horn-shaped air guide shrouds 2-2 are spaced axially. The large-diameter ends of the air guide shrouds 2-2 are securely connected to the inner wall of the duct 2-1, and the diameter of the large-diameter ends of the air guide shrouds 2-2 is smaller than the inner diameter of the duct 2-1. The small-diameter end of one of two adjacent air guide shrouds 2-2 is inserted into the large-diameter end of the adjacent air guide shroud 2-2. The large-diameter ends of the air guide shrouds 2-2 are provided with annular heat exchange vents 2-3 capable of facilitating the flow of cooling medium. Two adjacent annular heat exchange vents 2-3 are connected in series. The cooling pipes of the water-cooled permanent magnet direct-drive drum 1 are connected to the annular heat exchanger 2-3 via a circulating pump. A cooling fan 2-4 is installed inside the small-diameter end of the air guide shroud 2-2. The cooling fan 2-4 inside the air guide shroud 2-2 can generate cooling airflow, which is guided by the outer wall of the small-diameter end of the adjacent air guide shroud 2-2 and blown towards the annular heat exchanger 2-3. The airflow passing through the annular heat exchanger 2-3 can be directly discharged along the air duct 2-1 under the guidance of the outer wall of the large-diameter end of the adjacent air guide shroud 2-2, and no longer comes into heat exchange contact with the adjacent annular heat exchanger 2-3. That is, the airflow that exchanges heat with the annular heat exchanger 2-3 is all cold air that enters from the air inlet, resulting in high heat dissipation efficiency.

[0023] Example 2, in conjunction with Appendix Figures 1-4A heat dissipation system for a permanent magnet direct drive crane, which differs from Embodiment 1 in that, based on Embodiment 1, the water-cooled permanent magnet direct drive drum 1 includes a stator winding 1-1 and a drum housing 1-2 rotatably connected to the stator winding 1-1. The inner wall of the drum housing 1-2 is provided with a cooling coil 1-3. The cooling coil 1-3 can be arranged along the axial direction of the drum housing 1-2 or can be arranged circumferentially along the drum housing 1-2. A circulating cooling medium is introduced into the cooling coil 1-3. The cooling medium enters the heat exchange device 2 through a circulating pump for cooling and temperature reduction.

[0024] Both ends of the main shaft of the stator winding 1-1 are provided with transition devices that are connected to the heat exchange device 2. The transition device includes a hollow disk 1-4 that is coaxially and tightly connected to the main shaft of the stator winding 1-1. A hollow turntable 1-5 is rotatably connected to the outside of the hollow disk 1-4. The hollow turntable 1-5 is tightly connected to the drum housing 1-2, and the hollow turntable 1-5 is connected to the hollow disk 1-4. The water inlet and water outlet of the cooling coil 1-3 are respectively connected to the hollow turntable 1-5 at both ends of the stator winding 1-1. That is, the hollow turntable 1-5 can rotate around the hollow disk 1-4 with the drum housing 1-2, and the cooling medium in the hollow disk 1-4 can enter the cooling coil 1-3 through the hollow turntable 1-5.

[0025] The hollow discs 1-4 at both ends of the stator winding 1-1 are respectively connected to the water inlet and water outlet of the heat exchange device 2. The main shaft of the stator winding 1-1 is a hollow shaft, and its two ends are respectively connected to the water inlet and water outlet of the heat exchange device 2. That is, the circulating cooling medium can flow through the main shaft of the stator winding 1-1, thereby cooling the stator winding 1-1.

[0026] Example 3, in conjunction with Appendix Figures 1-4 A heat dissipation system for a permanent magnet direct-drive crane, based on embodiment 1 or 2, includes multiple air guide plates 2-5 spaced circumferentially along the inner side of the large-diameter end of the air guide shroud 2-2. These air guide plates 2-5 act as guides, improving heat exchange efficiency. The air guide plates 2-5 are spirally arranged along the axial direction of the air guide shroud 2-2, causing the cooling airflow to swirl and increasing its residence time. This increases the contact time between the cooling airflow and the annular heat exchanger 2-3, further enhancing the heat exchange effect. The small-diameter end of the air guide shroud 2-2 has a smooth constriction structure, preventing the cooling airflow from flowing directly upwards along the small-diameter end of the air guide shroud 2-2, allowing most of the cooling airflow to flow through the annular heat exchanger 2-3, ensuring heat exchange efficiency. Fans 2-6 are provided at both ends of the air duct 2-1, further improving the heat exchange effect.

[0027] Example 4, in conjunction with Appendix Figures 1-4A heat dissipation system for a permanent magnet direct-drive crane, based on any of the embodiments 1 to 3, wherein the air inlet end of the air duct 2-1 is detachably connected to a filter screen and the air outlet end is detachably connected to a protective mesh cover, which can prevent dust from accumulating on the annular heat exchanger 2-3 and reducing the heat exchange effect, and prevent foreign objects from entering the air duct 2-1 and affecting the normal operation of the cooling fans 2-4 and 2-6; the heat exchange device 2 can be installed on the crane trolley and move with the trolley, thereby avoiding interference with the operation of the crane.

[0028] The parts of this invention not described in detail are prior art. It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to encompass all changes falling within the meaning and scope of equivalents within this invention.

Claims

1. A heat dissipation system for a permanent magnet direct-drive crane, characterized in that: The device includes a water-cooled permanent magnet direct-drive drum (1) and a heat exchange device (2); the heat exchange device (2) includes a duct (2-1), and multiple horn-shaped air guides (2-2) are spaced apart along the axial direction inside the duct (2-1). The large diameter end of the air guide (2-2) is tightly connected to the inner wall of the duct (2-1), and the diameter of the large diameter end of the air guide (2-2) is smaller than the inner diameter of the duct (2-1); the small diameter end of one of the two adjacent air guides (2-2) is inserted into the large diameter end of the adjacent air guide (2-2); the large diameter end of the air guide (2-2) is provided with an annular heat exchanger (2-3) that can circulate the cooling medium, and the two adjacent annular heat exchangers (2-3) are connected in series. The cooling pipe of the water-cooled permanent magnet direct-drive drum (1) is connected to the annular heat exchanger (2-3) through a circulating pump; a cooling fan (2-4) is provided inside the small diameter end of the air guide (2-2).

2. The heat dissipation system for permanent magnet direct drive cranes as described in claim 1, characterized in that: The water-cooled permanent magnet direct-drive drum (1) includes a stator winding (1-1) and a drum housing (1-2) rotatably connected to the stator winding (1-1). The inner wall of the drum housing (1-2) is provided with a cooling coil (1-3). Both ends of the main shaft of the stator winding (1-1) are provided with transition devices corresponding to and connected to the heat exchange device (2). The transition device includes a hollow disk (1-4) coaxially and fastened to the main shaft of the stator winding (1-1). The hollow disk (1-4) is externally... A hollow turntable (1-5) is rotatably connected to the drum housing (1-2), and the hollow turntable (1-5) is connected to the hollow disc (1-4). The water inlet and outlet of the cooling coil (1-3) are connected to the hollow turntable (1-5) at both ends of the stator winding (1-1). The hollow disc (1-4) at both ends of the stator winding (1-1) is connected to the water inlet and outlet of the heat exchange device (2).

3. The heat dissipation system for permanent magnet direct drive cranes as described in claim 2, characterized in that: The main shaft of the stator winding (1-1) is a hollow shaft, and its two ends are respectively connected to the water inlet and water outlet of the heat exchange device (2).

4. The heat dissipation system for permanent magnet direct drive cranes as described in claim 1, characterized in that: The large-diameter end of the air guide shroud (2-2) is provided with multiple air guide plates (2-5) arranged at intervals along the circumference.

5. The heat dissipation system for permanent magnet direct drive cranes as described in claim 4, characterized in that: The air guide plate (2-5) is spirally arranged along the axial direction of the air guide cover (2-2).

6. The heat dissipation system for permanent magnet direct drive cranes as described in any one of claims 1, 3, or 4, characterized in that: The small-diameter end of the air guide shroud (2-2) has a smooth tapering structure.

7. The heat dissipation system for permanent magnet direct drive cranes as described in any one of claims 1 to 4, characterized in that: Fans (2-6) are provided at both ends of the air duct (2-1).

8. The heat dissipation system for permanent magnet direct drive cranes as described in claim 1, characterized in that: The air duct (2-1) has a filter screen detachably connected to the air inlet end and a protective mesh cover detachably connected to the air outlet end.

Images