A permanent magnet motor composite cooling system

Abstract

The present invention discloses a permanent magnet motor composite cooling system, belonging to the field of motor cooling; a permanent magnet motor composite cooling system includes a housing, a front end cover and a rear end cover are respectively fixed to both ends of the housing by bolts, a stator assembly is arranged inside the housing, the stator assembly includes a rotating shaft rotatably connected to the rear end cover, and a fan is fixed on the rotating shaft; a cooling water pipe is fixed inside the housing, the cooling water pipe is close to the winding on the stator assembly, and the wind generated by the rotation of the fan blows to the stator assembly after passing through the cooling water pipe; so that while the motor is working, the fan runs synchronously, and the generated wind passes through the cooling water pipe and then reaches the stator assembly, thereby ensuring that the temperature of the wind blowing to the stator assembly is low enough to accelerate the cooling inside the motor.

Description

Technical Field

[0001] The present invention belongs to the field of motor cooling, and particularly relates to a permanent magnet motor composite cooling system. Background Art

[0002] During the operation of a permanent magnet motor, a large amount of heat is generated. If the temperature is not lowered in time, the motor will be damaged due to high-temperature overload. At present, it is relatively common to cool the motor by setting a fan outside the motor. However, through external cooling, the cooling effect on the inside of the motor is not significant enough, so that the motor still has the risk of high-temperature overload. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a permanent magnet motor composite cooling system, which cools the motor from the inside of the motor to reduce the risk of high-temperature overload of the motor.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A permanent magnet motor composite cooling system includes a housing. The two ends of the housing are respectively fixed with a front end cover and a rear end cover by bolts. A stator assembly is arranged inside the housing. The stator assembly includes a rotating shaft rotatably connected to the rear end cover. A fan is fixed on the rotating shaft.

[0006] A cooling water pipe is fixed inside the housing. The cooling water pipe is close to the stator assembly. And the wind generated by the rotation of the fan blows to the stator assembly after passing through the cooling water pipe.

[0007] Further, a gear is fixed on the fan. A locking mechanism is arranged inside the housing. The locking mechanism includes a fixed rod fixed inside the housing. A clamping plate is slidably connected to the lower end of the fixed rod. A first spring is installed between the clamping plate and the fixed rod. The two ends of the first spring are respectively fixedly connected to the upper end part of the clamping plate and the fixed rod. Under the elastic force of the first spring, the end of the clamping plate can be engaged between two adjacent teeth of the gear.

[0008] Further, a pressing mechanism is arranged inside the housing. The pressing mechanism includes a fixing plate fixed inside the housing. A sliding rod is slidably connected to the fixing plate. A baffle is fixed to one end of the sliding rod close to the front end cover, and a first wedge block is fixed to the other end. A second spring is sleeved on the sliding rod. The two ends of the second spring are respectively fixedly connected to the baffle and the fixing plate. Under the elastic force of the second spring, the first wedge block has a tendency to move closer to the fixing plate. A second wedge block is arranged on the clamping plate. When the first wedge block contacts and interacts with the second wedge block, the clamping plate can be driven to rise.

[0009] Further, when the front end cover is disassembled, under the elastic force of the second spring, the first wedge block abuts against the fixing plate. At this time, the fixing plate extends out of the housing without being blocked by the front end cover, and the first wedge block does not contact the second wedge block. Under the elastic force of the first spring, the end of the clamping plate can be engaged between two adjacent teeth of the gear.

[0010] When the front end cover is fixedly installed at one end of the housing, the front end cover presses the fixing plate and drives the first wedge block to interact with the second wedge block, and drives the clamping plate to rise and leave the gear.

[0011] Further, the cooling water pipe is provided with a water inlet and a water outlet, both of which extend to the outside of the housing. Cooling water enters from the water inlet and enters the housing along the cooling water pipe, and then exits from the water outlet to realize the circulation of the cooling water.

[0012] Further, the fan includes a fixing ring sleeved on the rotating shaft and cooperating with the rotating shaft. The rotating shaft is provided with a threaded hole. By screwing a bolt into the fixing ring and cooperating with the threaded hole, the coaxial fixation of the fixing ring and the rotating shaft is realized.

[0013] Further, the stator assembly includes a stator core which is in interference fit with the inner hole of the housing.

[0014] Further, a plurality of cut edges are provided on the outer circle of the stator core, and a gap is formed between the cut edges and the inner hole of the housing. The wind generated by the rotation of the fan can penetrate the housing along the gap between the cut edges and the housing. Moreover, through slots are provided on both the front end cover and the rear end cover.

[0015] Further, after the housing is heated by a heating coil, it is assembled with the stator core, and then the housing is cooled to complete the assembly.

[0016] A permanent magnet motor includes the above cooling system.

[0017] Advantages of the present invention:

[0018] 1. By arranging a fan and a cooling water pipe in the housing, the cooling water pipe is wound around the rotating shaft in multiple circles, and by fixing the fan on the rotating shaft, the fan runs synchronously while the motor is working. Moreover, the generated wind passes through the cooling water pipe and then reaches the stator assembly, so as to ensure that the temperature of the wind blown to the stator assembly is low enough to accelerate the cooling inside the motor.

[0019] 2. By providing a plurality of cut edges on the outer circle of the stator core to form a gap with the inner hole of the housing, and by providing through slots on both the front end cover and the rear end cover, it is ensured that the wind of the fan can penetrate the entire interior of the motor and can exchange with the outside air to accelerate the cooling.

[0020] 3. By setting a locking mechanism inside the housing to limit the rotational freedom of the fan, and by setting a pressing mechanism to be associated with the position of the front end cover, the rotation timing of the fan is controlled. In this way, while ensuring the normal operation of the motor, the fan can complete the cooling work properly, and at the same time, the occurrence of safety accidents caused by the rotation of the fan during the maintenance process is avoided. Brief Description of the Drawings

[0021] 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 the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 is the overall structural schematic diagram of the present invention;

[0023] Figure 2 is the internal structural schematic diagram of the housing of the present invention;

[0024] Figure 3 is the structural schematic diagram of the stator assembly of the present invention;

[0025] Figure 4 is the structural schematic diagram of the cooling water pipe of the present invention;

[0026] Figure 5 is the structural schematic diagram of the fan of the present invention;

[0027] Figure 6 is the structural schematic diagram of the locking mechanism of the present invention;

[0028] Figure 7 is the structural schematic diagram of the pressing mechanism of the present invention. Detailed Embodiments

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0030] As Figure 1 shown, a permanent magnet motor composite cooling system includes a housing 1. Both ends of the housing 1 are open, and a front end cover 2 and a rear end cover 3 are respectively fixed to both ends of the housing 1 by bolts, so as to facilitate the maintenance and repair of the parts inside the housing;

[0031] As Figures 2-3, a stator assembly 4 is arranged inside the housing 1. The stator assembly 4 includes a stator core 41, and the stator core 41 is in interference fit with the inner hole of the housing 1. And in some disclosures, by heating the housing 1 with a heating coil to make the inner diameter of the housing 1 larger to meet the clearance fit with the outer diameter of the stator core 41, after assembly, by cooling the housing 1, the inner diameter of the housing 1 shrinks, thereby clamping the stator core 41 tightly, so as to complete the assembly of the stator core 41 and the housing 1;

[0032] The stator assembly 4 further includes a rotating shaft 43. The rotating shaft 43 is rotatably connected to the rear end cover 3, and the rotating shaft 43 is coaxial with the stator core 41; a rotor 44 is coaxially fixed on the rotating shaft 43, the outer diameter of the rotor 44 is smaller than the inner diameter of the stator core 41, and a winding 42 is arranged on the stator core 41. The main component of the winding 42 is copper wire. During the operation of the motor, a large amount of heat will be generated in the winding 42, resulting in overheating of the motor;

[0033] In order to achieve heat dissipation of the motor, in this embodiment, a fan 6 and a cooling water pipe 5 are arranged inside the housing 1. As Figures 4-5 shown, the cooling water pipe 5 is fixed inside the housing 1 and is close to the winding 42. An inlet 51 and an outlet 52 are arranged on the cooling water pipe 5. Both the inlet 51 and the outlet 52 extend to the outside of the housing 1. Cooling water enters from the inlet 51 and enters the inside of the housing 1 along the cooling water pipe 5, and then comes out from the inlet 51 to realize the circulation of the cooling water, so as to ensure that the water temperature in the cooling water pipe is low enough. The wind generated by the rotation of the fan 6 passes through the cooling water pipe 5 and blows towards the stator assembly 4, thereby cooling the inside of the motor to achieve the purpose of water cooling;

[0034] The fan 6 includes a fixing ring 61. The fixing ring 61 is sleeved on the rotating shaft 43 and cooperates with the rotating shaft 43. By screwing a bolt into the fixing ring 61 and entering into cooperation with the threaded hole opened on the rotating shaft 43, the coaxial fixation of the fixing ring 61 and the rotating shaft 43 is realized; a plurality of fan blades 62 are fixed on the fixing ring 61. When the motor is operating, the rotation of the rotating shaft 43 drives the fan 6 to operate, thereby realizing the blowing and cooling of the stator assembly 4.

[0035] In this embodiment, a plurality of cut edges are arranged on the outer circle of the stator core 41. A gap is formed between the cut edges and the inner hole of the housing, so that the wind generated by the operation of the fan 6 driven by the rotating shaft 43 can penetrate the housing 1 along the gap between the cut edges and the housing 1. And through grooves are opened on both the front end cover 2 and the rear end cover 3 to facilitate the exchange of air inside the motor with the outside world and accelerate cooling.

[0036] A gear 7 is fixed on the fixing ring 61. A locking mechanism 8 is arranged inside the housing 1. The locking mechanism 8 can engage with the gear 7 to limit the rotation of the rotating shaft 43 and the fan 6, preventing the rotating shaft 43 and the fan 6 from suddenly rotating under misoperation during the disassembly of the cover (front cover) for maintenance, thus avoiding safety accidents.

[0037] As Figure 6 shown, the locking mechanism 8 includes a fixing rod 81 fixed inside the housing 1. A clamping plate 82 is slidably connected to the lower end of the fixing rod 81. The end of the clamping plate 82 can engage between two adjacent teeth of the gear 7 to limit the rotation of the rotating shaft 43 and the fan 6. A first spring 83 is installed between the clamping plate 82 and the fixing rod 81. The two ends of the first spring 83 are respectively fixedly connected to the upper end of the clamping plate 82 and the fixing rod 81. Under the elastic force of the first spring 83, the end of the clamping plate 82 can engage between two adjacent teeth of the gear 7 to complete the locking function. At this time, the disassembly and maintenance of the cover are relatively safe.

[0038] A pressing mechanism 9 is arranged inside the housing 1. The pressing mechanism 9 is used to control the locking timing of the locking mechanism 8, so as to achieve the purpose of controlling the rotation timing of the fan 6, and make it that: when the front cover 2 is fixedly installed on the housing 1, the clamping plate 82 in the locking mechanism 8 can leave the gear 7 to release the rotation freedom of the fan 6; and when the front cover 2 is disassembled for maintenance operations, the clamping plate 82 in the locking mechanism 8 engages between two adjacent teeth of the gear 7 to limit the rotation freedom of the fan 6; thus, while ensuring that the fan 6 can complete the cooling work normally during the operation of the motor, the occurrence of safety accidents caused by the rotation of the fan during the maintenance process is avoided.

[0039] As Figure 7 shown, the pressing mechanism 9 includes a fixing plate 91 fixed inside the housing 1. A sliding rod 92 is slidably connected to the fixing plate 91. A baffle 93 is fixed to one end of the sliding rod 92 close to the front cover 2, and a first wedge block 94 is fixed to the other end. A second spring 95 is sleeved on the sliding rod 92. The two ends of the second spring 95 are respectively fixedly connected to the baffle 93 and the fixing plate 91. Under the elastic force of the second spring 95, the first wedge block 94 has a tendency to move closer to the fixing plate 91. A second wedge block 84 is arranged on the clamping plate 82. When the first wedge block 94 contacts and interacts with the second wedge block 84, it can drive the clamping plate 82 to rise.

[0040] When maintenance is carried out, the front end cover 2 is disassembled. Under the elastic force of the second spring 95, the first wedge block 94 abuts against the fixed plate 91. At this time, the fixed plate 91 extends out of the housing 1 without being blocked by the front end cover 2, and the first wedge block 94 does not contact the second wedge block 84. Under the elastic force of the first spring 83, the end of the clamping plate 82 can be engaged between two adjacent teeth of the gear 7 to complete the locking function, so as to ensure the safety during the maintenance process;

[0041] After the maintenance is completed, the front end cover 2 is fixedly installed at one end of the housing. The front end cover 2 presses the fixed plate 91 and drives the first wedge block 94 to interact with the second wedge block 84, and drives the clamping plate 82 to rise and leave the gear 7, so as to release the rotational freedom of the fan 6 and the rotating shaft 43, to ensure the normal operation of the motor and the fan 6 inside it.

[0042] Working principle:

[0043] By arranging the fan 6 and the cooling water pipe 5 in the housing 1, the cooling water pipe 5 is wound around the rotating shaft 43 in multiple turns, and by fixing the fan 6 on the rotating shaft 43, when the motor is working, the fan 6 runs synchronously. Moreover, the generated wind passes through the cooling water pipe 5 and then reaches the stator assembly 4, so as to ensure that the temperature of the wind blown to the stator assembly 4 is low enough to accelerate the cooling inside the motor; in addition, by arranging a plurality of cut edges on the outer circle of the stator core 41 to form a gap with the inner hole of the housing, and by opening through grooves on both the front end cover 2 and the rear end cover 3, it is ensured that the wind of the fan can penetrate the entire inside of the motor and can exchange with the outside air to accelerate the cooling; by arranging a locking mechanism 8 in the housing 1 to limit the rotational freedom of the fan 6, and by arranging a pressing mechanism 9 to be associated with the position of the front end cover 2, so as to control the timing of the fan 6 rotating. Thus, when ensuring the operation of the motor, the fan 6 can normally complete the cooling work, while avoiding the occurrence of safety accidents caused by the rotation of the fan during the maintenance process.

[0044] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0045] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A permanent magnet motor composite cooling system, comprising a housing (1), a front end cover (2) and a rear end cover (3) are respectively fixed to both ends of the housing (1) by bolts, and a stator assembly (4) is arranged inside the housing (1), characterized in that, The stator assembly (4) includes a rotating shaft (43) rotatably connected to the rear end cover (3), and a fan (6) is fixed on the rotating shaft (43); A cooling water pipe (5) is fixed inside the housing (1). The cooling water pipe (5) is close to the winding stator assembly (4). Moreover, the wind generated by the rotation of the fan (6) blows to the stator assembly (4) after passing through the cooling water pipe (5); A gear (7) is fixed on the fan (6). A locking mechanism (8) is arranged inside the housing (1). The locking mechanism (8) includes a fixing rod (81) fixed inside the housing (1). A clamping plate (82) is slidably connected to the lower end of the fixing rod (81). A first spring (83) is installed between the clamping plate (82) and the fixing rod (81). Two ends of the first spring (83) are respectively fixedly connected to the upper end of the clamping plate (82) and the fixing rod (81). Under the elastic force of the first spring (83), the end of the clamping plate (82) can be engaged between two adjacent teeth of the gear (7); A pressing mechanism (9) is arranged inside the housing (1). The pressing mechanism (9) includes a fixing plate (91) fixed inside the housing (1). A sliding rod (92) is slidably connected to the fixing plate (91). A baffle (93) is fixed at one end of the sliding rod (92) close to the front end cover (2), and a first wedge block (94) is fixed at the other end. A second spring (95) is sleeved on the sliding rod (92). Two ends of the second spring (95) are respectively fixedly connected to the baffle (93) and the fixing plate (91). Under the elastic force of the second spring (95), the first wedge block (94) has a tendency to move closer to the fixing plate (91); A second wedge block (84) is arranged on the clamping plate (82). When the first wedge block (94) contacts and interacts with the second wedge block (84), the clamping plate (82) can be driven to rise.

2. The permanent magnet motor composite cooling system according to claim 1, wherein, When the front end cover (2) is disassembled, under the elastic force of the second spring (95), the first wedge block (94) abuts against the fixing plate (91). At this time, the fixing plate (91) extends out of the housing (1) without being blocked by the front end cover (2), and the first wedge block (94) does not contact the second wedge block (84). Under the elastic force of the first spring (83), the end of the clamping plate (82) can be engaged between two adjacent teeth of the gear (7); When the front end cover (2) is fixedly installed at one end of the housing, the front end cover (2) presses the fixing plate (91) and drives the first wedge block (94) to interact with the second wedge block (84), and drives the clamping plate (82) to rise and leave the gear (7).

3. A permanent magnet motor composite cooling system according to claim 1, characterized in that, An inlet (51) and an outlet (52) are arranged on the cooling water pipe (5). Both the inlet (51) and the outlet (52) extend to the outside of the housing (1). Cooling water enters from the inlet (51) and enters the inside of the housing (1) along the cooling water pipe (5), and then comes out from the inlet (51) to realize the circulation of the cooling water.

4. The composite cooling system for a permanent magnet motor according to claim 1, wherein, The fan (6) includes a fixing ring (61), the fixing ring (61) is sleeved on the rotating shaft (43) and cooperates with the rotating shaft (43). Threaded holes are provided on the rotating shaft (43). By screwing bolts into the fixing ring (61) and cooperating with the threaded holes, the coaxial fixation of the fixing ring (61) and the rotating shaft (43) is achieved.

5. The composite cooling system for a permanent magnet motor according to claim 1, characterized in that, The stator assembly (4) includes a stator core (41), and the stator core (41) is in interference fit with the inner hole of the housing (1).

6. The composite cooling system of a permanent magnet motor according to claim 5, characterized in that, A plurality of cutting edges are provided on the outer circle of the stator core (41). A gap is formed between the cutting edges and the inner hole of the housing. The wind generated by the rotation of the fan (6) can penetrate the housing (1) along the gap between the cutting edges and the housing (1). Moreover, through grooves are provided on both the front end cover (2) and the rear end cover (3).

7. A permanent magnet motor composite cooling system according to claim 5, characterized in that, After the housing (1) is heated by a heating coil, it is assembled with the stator core (41), and then the housing (1) is cooled to complete the assembly.

8. A permanent magnet motor includes the cooling system according to any one of claims 1-7.

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