Variable frequency motor with adaptive noise reduction device

Abstract

The invention relates to a variable frequency motor with a self-adaptive noise reduction device, which is applied to the field of motors and is characterized in that when the variable frequency motor is used, through arrangement of a micro-gap unit and a pre-cooling cylinder, on one hand, a cooling medium can circularly flow inside and outside a bearing seat, and on the other hand, part of the cooling medium can be pre-stored in the pre-cooling cylinder after being discharged from the bearing seat; the cooling medium is cooled preliminarily and then discharged into the micro-gap units, so that the radial span of the cooling medium is multiplied, the transverse span of the cooling medium is multiplied, then the cooling medium is cooled in a split manner, the heat exchange area between the cooling medium and external air is remarkably increased, and the cooling medium is fully cooled before returning to the bearing seat again for cooling; the motor provided by the invention is simple in structure, is matched with the cooling fan, effectively reduces the wear caused by high temperature due to rotation friction, further effectively inhibits the noise caused by wear, and effectively improves the applicability compared with a cooling mode of an external cold source in the prior art.

Description

Technical Field

[0001] A variable-frequency motor related to the present invention, in particular, a variable-frequency motor with an adaptive noise reduction device applied to the field of motors. Background Art

[0002] A variable-frequency motor refers to a motor that can continuously operate at 100% rated load within the range of 10% - 100% rated speed under standard environmental conditions, and the temperature rise will not exceed the allowable value calibrated for the motor.

[0003] When the motor is in use, due to high-speed rotation, it will cause heat generation due to friction, resulting in a certain degree of thermal expansion and deformation of the material, and then causing wear between the rotor and the bearing of the motor. When the wear is relatively serious, it may cause the rotor to have unbalanced movement and jumping phenomena, resulting in a large abnormal noise. In the prior art, generally, the method of lubrication combined with heat dissipation is used to reduce the frictional force and heat during rotation, and then greatly reduce the wear amplitude under the same rotation, effectively avoiding the occurrence of abnormal noise. For example, a low-noise high-voltage motor disclosed in the Chinese patent specification with the publication number CN112865402A, and a water-cooled motor for a photovoltaic well pump disclosed in the Chinese patent specification with the publication number CN115549392A.

[0004] However, in the above heat dissipation methods, the access of an external cold source is often required. On the one hand, the cooling cost is relatively high. On the other hand, for some variable-frequency motors, there is no condition for accessing an external cold source. At this time, generally, a cooling fan is installed to accelerate the air flow rate around the motor for heat dissipation. However, the heat dissipation effect of this heat dissipation method is limited, and the effect of suppressing heat accumulation at the bearing of the motor is poor. Summary of the Invention

[0005] Aiming at the above-mentioned prior art, the technical problem to be solved by the present invention is that the heat dissipation effect of the existing heat dissipation method for the motor without a cold source is poor, resulting in easy occurrence of wear and shaft jumping phenomena, causing abnormal noise.

[0006] To solve the above problems, the present invention provides a variable-frequency motor with an adaptive noise reduction device, including a motor body. Two bearing seats are installed inside the motor body. The two bearing seats are respectively connected to a rotor shaft through two bearings. The output end of the rotor shaft movably penetrates through the motor body and extends outside the motor body. Cooling grooves are dug inside the bearing seats. Two liquid guide holes are dug at the upper end of the motor body and the upper end of the bearing seats respectively. The two liquid guide holes on the bearing seat respectively correspond to and communicate with the two ends of the two cooling grooves. Gap heat dissipation components are installed between the two pairs of the four liquid guide holes on the motor body that are corresponding left and right. The two gap heat dissipation components are symmetrically distributed about the center. A bottom plate is fixedly connected to the middle of the upper end of the motor body. The middle parts of the lower ends of the two gap heat dissipation components are fixedly connected to the bottom plate;

[0007] The gap heat dissipation component includes a micro-gap unit, a liquid inlet pipe fixedly connected to one end of the micro-gap unit, and a liquid discharge pipe fixedly connected to the other end of the micro-gap unit. The mutually remote ends of the liquid inlet pipe and the liquid discharge pipe are respectively connected to the corresponding bearing seats. Both the upper left and upper right ends of the bottom plate are provided with... The middle of the liquid inlet pipe is connected in series with a pre-cooling cylinder. The two pre-cooling cylinders are respectively located directly above the two... A liquid replacement unit is installed on the pre-cooling cylinder.

[0008] In the above variable-frequency motor with an adaptive noise reduction device, the gap heat dissipation component can be used to perform segmented heat dissipation on the cooling medium for cooling the bearing, thereby effectively reducing the wear caused by high temperature due to rotational friction, reducing the occurrence of abnormal noise, and thus effectively suppressing the noise brought by wear. Compared with the external cold source heat dissipation method in the prior art, the applicability of this motor is effectively improved.

[0009] As a further improvement of this application, the cross-section of the cooling groove is an open ring shape, and the corresponding angles of the openings of the two are not greater than 30°. The two liquid guiding holes on the bearing seat respectively correspond to the two ends of the cooling groove.

[0010] As a further improvement of this application, the micro-gap unit includes a plurality of micro-gap sheets, a plurality of transfer sheets respectively fixedly connected to one of the corners at the upper ends of the micro-gap sheets, a plurality of upper liquid guiding pipes respectively fixedly connected between the plurality of transfer sheets, and a plurality of lower liquid guiding pipes respectively fixedly connected between one of the corners at the lower ends of adjacent two micro-gap sheets. The lower liquid guiding pipes and the transfer sheets are correspondingly inclined, and the micro-gap sheets are located at the corners on the side close to the horizontal center line of the motor body.

[0011] As a further improvement of this application, the micro-gap sheet is a hollow sheet structure, and the width of the internal space of the micro-gap sheet is 1 - 3 mm. The distance between adjacent two micro-gap sheets is 3 - 5 times the width of the internal space of the micro-gap sheet.

[0012] As a further improvement of this application, the liquid replacement unit includes a retaining ring fixedly connected to the outer end of the pre-cooling cylinder close to the micro-gap unit side, an electromagnetic ring sleeved on the outer end of the pre-cooling cylinder, a liquid deflecting sheet slidably fitted in the pre-cooling cylinder, and a plurality of electric push rods fixedly connected between the retaining ring and the electromagnetic ring. The liquid deflecting sheet corresponds to the electromagnetic ring.

[0013] As a further improvement of this application, the liquid deflecting sheet is a porous plate structure, and a plurality of iron sheets are fixedly inlaid on the outer ring surface of the liquid deflecting sheet. There is an adsorption force between the iron sheets and the electromagnetic ring.

[0014] As a further improvement supplement of this application, two retaining rings, electric push rods, and electromagnetic rings are provided. Two guide rods are fixedly connected between the left and right inner walls of the pre-cooling cylinder. The guide rods include two large-diameter rods and a small-diameter rod fixedly connected between the two large-diameter rods.

[0015] As another improved supplement of the present application, the liquid-draining piece includes an inner circular plate and two outer magnetic rings respectively corresponding to the two electromagnetic rings. The inner circular plate is located between the two outer magnetic rings. The inner wall of the outer magnetic ring contacts the outer surface of the large-diameter rod, and both small-diameter rods movably penetrate through the inner circular plate.

[0016] As another improved supplement of the present application, the large-diameter rod and the small-diameter rod are coaxially arranged, and the outer diameter of the large-diameter rod is greater than the outer diameter of the small-diameter rod, and the inner diameter of the outer magnetic ring is smaller than the outer diameter of the inner circular plate.

[0017] In summary, during use, through the setting of the micro-gap unit and the pre-cooling cylinder, on the one hand, the circulating flow of the cooling medium inside and outside the bearing housing can be realized. On the other hand, part of the cooling medium can be pre-stored in the pre-cooling cylinder after being discharged from the bearing housing for preliminary cooling, and then can be discharged into the micro-gap unit, so that the radial span of the cooling medium is increased several times, while the transverse span is reduced several times, thereby achieving piece-by-piece heat dissipation of it, significantly increasing the heat exchange area with the outside air, so that the cooling medium is fully cooled before returning to the bearing housing for temperature reduction again. With the cooperation of the cooling fan, the wear caused by high temperature due to rotational friction is effectively reduced, and thus the occurrence of noise caused by wear is effectively suppressed. Compared with the prior art of external cold source heat dissipation method, the applicability of this motor is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the right-side perspective view of the first embodiment of the present application;

[0019] Figure 2 It is the left-side perspective view of the first embodiment of the present application;

[0020] Figure 3 It is the front view of the first embodiment of the present application;

[0021] Figure 4 It is the sectional view of the part at the bearing housing of the first embodiment of the present application;

[0022] Figure 5 It is the top view schematic diagram of the gap heat dissipation component of the first embodiment of the present application;

[0023] Figure 6 It is the perspective view of the gap heat dissipation component of the first embodiment of the present application;

[0024] Figure 7 It is the disassembled perspective view of the gap heat dissipation component of the first embodiment of the present application;

[0025] Figure 8 It is the top view sectional view of the pre-cooling cylinder of the first embodiment of the present application;

[0026] Figure 9The top view cross-sectional view of the pre-cooling cylinder according to the second embodiment of the present application;

[0027] Figure 10 The three-dimensional view of the liquid deflector part according to the second embodiment of the present application;

[0028] Figure 11 The radial schematic diagram of the liquid deflector according to the second embodiment of the present application;

[0029] Figure 12 The schematic diagram when the liquid deflector deflects liquid according to the second embodiment of the present application.

[0030] Explanation of the reference numerals in the figure:

[0031] 1 motor body, 2 rotor shaft, 201 bearing seat, 202 liquid guiding hole, 203 cooling groove, 3 micro-gap unit, 31 bottom plate, 321 micro-gap sheet, 322 transfer sheet, 323 upper liquid guiding pipe, 324 lower liquid guiding pipe, 41 liquid inlet pipe, 42 liquid discharge pipe, 5 pre-cooling cylinder, 501 retaining ring, 71 electric push rod, 72 electromagnetic ring, 6 liquid deflector, 61 outer magnetic ring, 62 inner circular plate, 81 large-diameter rod, 82 small-diameter rod. Specific embodiments

[0032] The following will describe in detail the two embodiments of the present application with reference to the accompanying drawings.

[0033] The first embodiment:

[0034] Figures 1-3 As shown, a variable-frequency motor with an adaptive noise reduction device includes a motor body 1. Two bearing seats 201 are installed in the motor body 1. Between the two bearing seats 201, they are respectively connected to the rotor shaft 2 through two bearings. The output end of the rotor shaft 2 movably penetrates the motor body 1 and extends outside the motor body 1, as Figure 4, a cooling groove 203 is drilled inside the bearing housing 201, and two liquid guide holes 202 are drilled at the upper end of the motor body 1 and the upper end of the bearing housing 201 respectively. The two liquid guide holes 202 on the bearing housing 201 correspond to and communicate with the two ends of the two cooling grooves 203 respectively. A gap heat dissipation assembly is installed between every two of the four liquid guide holes 202 on the motor body 1 that correspond to each other left and right. The two gap heat dissipation assemblies are symmetrically distributed about the center. A bottom plate 31 is fixedly connected to the middle of the upper end of the motor body 1, and the middle of the lower ends of the two gap heat dissipation assemblies is fixedly connected to the bottom plate 31. During use, through the liquid guide holes 202 on both sides and the two gap heat dissipation assemblies, the cooling medium can circulate between the cooling grooves 203 in the two bearing housings 201. The part of the cooling medium adsorbed with heat can enter the pre-cooling cylinder 5 along the liquid inlet pipe 41. The cooling medium preliminarily cooled by exposure in the pre-cooling cylinder 5 can enter the micro-gap unit 3 and be quickly cooled through a plurality of micro-gap sheets 321. The cooling medium cooled in the micro-gap unit 3 originally enters the bearing housing 201 on the other side along the liquid discharge pipe 42, realizing the replacement of the coolant between the micro-gap unit 3 and the cooling groove 203. Compared with the prior art, there is no need to externally connect a cold source, and it can also assist in cooling the heat dissipation risk in the prior art synchronously, greatly improving the cooling effect.

[0035] In the above variable-frequency motor with an adaptive noise reduction device, the gap heat dissipation assembly can be used to perform piecemeal heat dissipation on the cooling medium used for cooling the bearing, thereby effectively reducing the wear caused by high temperature due to rotational friction, reducing the occurrence of abnormal noise, and thus effectively suppressing the noise caused by wear. Compared with the heat dissipation method of externally connecting a cold source in the prior art, the applicability of this motor is effectively improved.

[0036] The cross-section of the cooling groove 203 is an open ring, and the angle corresponding to the openings of the two is not greater than 30°, so that the amplitude of the opening is not too large to affect the heat dissipation effect of the bearing housing 201. The two liquid guide holes 202 on the bearing housing 201 correspond to the two ends of the cooling groove 203 respectively, so that the liquid guide holes 202, the cooling groove 203 and the two gap heat dissipation assemblies form a complete circulation loop, facilitating the cooling medium adsorbed with the heat at the bearing housing 201 to flow to the outside of the motor body 1 for heat dissipation and then flow back into the other bearing housing 201 for heat absorption.

[0037] Such as Figures 5-6, the gap heat dissipation component includes a micro-gap unit 3, a liquid inlet pipe 41 fixedly connected to one end of the micro-gap unit 3, and a liquid discharge pipe 42 fixedly connected to the other end of the micro-gap unit 3. The two micro-gap units 3 on the two gap heat dissipation components are arranged in an interlaced manner. The ends of the liquid inlet pipe 41 and the liquid discharge pipe 42 that are far away from each other are respectively connected to the corresponding bearing seats 201. 301 are respectively drilled at the upper left and right ends of the bottom plate 31. A pre-cooling cylinder 5 is connected in series in the middle of the liquid inlet pipe 41. The two pre-cooling cylinders 5 are respectively located directly above the two 301. A liquid exchange unit is installed on the pre-cooling cylinder 5. Through the setting of the liquid exchange unit, the cooling medium in the pre-cooling cylinder 5 can be pushed and moved into the micro-gap unit 3, and then it presents a multi-sheet redistribution in the micro-gap unit 3, greatly increasing the surface area, so that the heat in it can be quickly dissipated. After it enters the cooling tank 203 again, it can have a good heat absorption effect. In specific implementation, the electric push rod 71 can be controlled to move back and forth multiple times, so that the cooling medium in the micro-gap unit 3 can fully flow in the cooling tank 203, making the heat absorption effect better.

[0038] Such as Figure 7 , the micro-gap unit 3 includes a plurality of micro-gap sheets 321, a plurality of transfer sheets 322 respectively fixedly connected to one corner at the upper end of the micro-gap sheets 321, a plurality of upper liquid guide pipes 323 respectively fixedly connected between the plurality of transfer sheets 322, and a plurality of lower liquid guide pipes 324 respectively fixedly connected between one corner at the lower end of two adjacent micro-gap sheets 321. The plurality of micro-gap sheets 321 on the two gap heat dissipation units are arranged in an interlaced manner. The lower liquid guide pipe 324 and the transfer sheet 322 are correspondingly arranged at an oblique angle, and the micro-gap sheet 321 is located at the corner on the side close to the horizontal center line of the motor body 1.

[0039] The micro-gap sheet 321 is a hollow sheet structure, and the width of the internal space of the micro-gap sheet 321 is 1-3 mm. The distance between two adjacent micro-gap sheets 321 is 3-5 times the width of the internal space of the micro-gap sheet 321, so that the gap between two adjacent micro-gap sheets 321 is relatively large, and the area of the micro-gap sheet 321 itself is relatively large, but the volume is thin, so that the surface area of the cooling medium located therein is relatively large. Cooperating with the cooling fan owned by the variable-frequency motor, the air flow speed around it is relatively fast, so that the cooling medium can better exchange heat with the air and accelerate the cooling speed.

[0040] Such as Figure 8The liquid exchange unit includes a retaining ring 501 fixedly connected to the outer end of the pre-heating cylinder 5 near the micro-gap unit 3, an electromagnetic ring 72 sleeved on the outer end of the pre-heating cylinder 5, a liquid-extracting sheet 6 slidably fitted in the pre-heating cylinder 5, and a plurality of electric push rods 71 fixedly connected between the retaining ring 501 and the electromagnetic ring 72. The liquid-extracting sheet 6 corresponds to the electromagnetic ring 72, and a plurality of iron sheets are fixedly inlaid on the outer ring surface of the liquid-extracting sheet 6. There is a mutual adsorption force between the iron sheet and the electromagnetic ring 72, so that when the electromagnetic ring 72 reciprocates outside the pre-heating cylinder 5 under the drive of the electric push rod 71, it can cooperate with the liquid-extracting sheet 6 to reciprocate under the action of the magnetic attraction force, thereby realizing the displacement of the coolant inside it, facilitating the stable flow of the cooling medium, and then realizing the outward transportation and dissipation of heat.

[0041] The liquid-repelling sheet 6 is a porous plate-like structure, so that the arrangement of the liquid-repelling sheet 6 is not likely to affect the stable flow of the cooling medium between the two gap heat dissipation components and the cooling groove 203. Among them, the hole on the liquid-repelling sheet 6 is a conical hole, and the hole diameter facing the micro-gap unit 3 is small, so that during a single extension and contraction process of the electric push rod 71, under the movement of the liquid-repelling sheet 6, the liquid transported toward the micro-gap unit 3 is more than the medium flowing in the opposite direction, thereby effectively ensuring that when the electric push rod 71 reciprocates multiple times, the cooling groove 203 can more fully receive the cooling medium from the micro-gap unit 3.

[0042] It is worth noting that, according to actual needs, the electric push rod 71 can also be set in the pre-cooling cylinder 5 to directly drive the liquid-removing plate 6. In this case, the electromagnetic ring 72 and the baffle ring 501 do not need to be set. The electric push rod 71 is set outside the pre-cooling cylinder 5, and the electric push rod 71 does not need to be in direct contact with the cooling medium, so that its service life and stability of use are not easily affected.

[0043] In addition, in order to further ensure the stable circulation of the cooling medium, a circulation pump may be provided on one of the liquid inlet pipes 41 according to actual needs.

[0044] In summary, when in use, through the arrangement of the micro-gap unit 3 and the pre-heating cylinder 5, on the one hand, the circulation of the cooling medium inside and outside the bearing seat can be realized, and on the other hand, part of the cooling medium can be pre-stored in the pre-heating cylinder 5 after being discharged from the bearing seat for preliminary cooling, and then can be discharged into the micro-gap unit 3, so that the radial span of the cooling medium is increased by several times, while the lateral span is reduced by several times, thereby achieving a slice-type heat dissipation, significantly increasing the heat exchange area with the outside air, so that the cooling medium is fully cooled before returning to the bearing seat for cooling again, and cooperates with the cooling fan to effectively reduce the wear caused by high temperature of rotation friction, thereby effectively suppressing the occurrence of noise caused by wear, and compared with the heat dissipation method of the external cold source in the prior art, the applicability of the motor is effectively improved.

[0045] The second implementation method:

[0046] On the basis of the first embodiment, this embodiment further improves the liquid pumping unit, and the rest is the same as the first embodiment.

[0047] Figures 9-10 As shown, two retaining rings 501, two electric push rods 71 and two electromagnetic rings 72 are provided. Two guide rods are fixedly connected between the left and right inner walls of the pre-cooling cylinder 5. The guide rods include two large-diameter rods 81 and a small-diameter rod 82 fixedly connected between the two large-diameter rods 81. The liquid pumping piece 6 includes an inner circular plate 62 and two outer magnetic rings 61 corresponding to the two electromagnetic rings 72 respectively. The inner circular plate 62 is located between the two outer magnetic rings 61. The inner wall of the outer magnetic ring 61 contacts the outer surface of the large-diameter rod 81, and both small-diameter rods 82 movably penetrate through the inner circular plate 62.

[0048] The large-diameter rod 81 and the small-diameter rod 82 are coaxially arranged, and the outer diameter of the large-diameter rod 81 is greater than the outer diameter of the small-diameter rod 82. The inner diameter of the outer magnetic ring 61 is smaller than the outer diameter of the inner circular plate 62, effectively restricting the inner circular plate 62 to reciprocate only on the small-diameter rod 82. As Figure 12 shown, when the liquid pumping piece 6 pushes the liquid towards the micro-gap unit 3, only one electric push rod 71 needs to act. As Figure 11 shown, at this time, the outer magnetic ring 61 and the inner circular plate 62 are in contact and coincide with each other, making it in an overall closed state, which can fully push the cooling medium into the micro-gap unit 3, and the cooling medium in the micro-gap unit 3 can be fully pushed into the cooling groove 203. When the liquid pumping piece 6 resets, the outer magnetic ring 61 and the inner circular plate 62 can be separated. By controlling the two electric push rods 71 to move successively, when it moves away from the micro-gap unit 3, the effect of pushing the cooling medium in the reverse direction is poor. As a result, the relatively low-temperature cooling medium entering the cooling groove 203 is not easily pushed out, thus effectively ensuring the heat dissipation effect on the bearing seat 201.

[0049] Combined with the current actual requirements, the above-mentioned embodiment adopted in this application, the protection scope is not limited thereto. Within the knowledge scope of those skilled in the art, various changes made without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A variable-frequency motor with an adaptive noise reduction device, comprising a motor body (1), wherein two bearing seats (201) are installed in the motor body (1), and two ends between the two bearing seats (201) are respectively connected to a rotor shaft (2) through two bearings. The output end of the rotor shaft (2) movably penetrates through the motor body (1) and extends outside the motor body (1), and is characterized in that: A cooling groove (203) is formed inside the bearing housing (201). Two liquid guiding holes (202) are formed at the upper end of the motor body (1) and the upper end of the bearing housing (201). The two liquid guiding holes (202) on the bearing housing (201) respectively correspond to and communicate with the two ends of the two cooling grooves (203). Gap heat dissipation components are installed between every two of the four liquid guiding holes (202) on the motor body (1) that correspond to each other left and right. The two gap heat dissipation components are symmetrically distributed about the center. A bottom plate (31) is fixedly connected to the middle of the upper end of the motor body (1). The middle parts of the lower ends of the two gap heat dissipation components are both fixedly connected to the bottom plate (31). The gap heat dissipation component includes a micro-gap unit (3), a liquid inlet pipe (41) fixedly connected to one end of the micro-gap unit (3), and a liquid discharge pipe (42) fixedly connected to the other end of the micro-gap unit (3). The mutually remote ends of the liquid inlet pipe (41) and the liquid discharge pipe (42) respectively communicate with the corresponding bearing housing (201). Openings (301) are formed at the upper left and right ends of the bottom plate (31). A pre-cooling cylinder (5) is connected in series in the middle of the liquid inlet pipe (41). The two pre-cooling cylinders (5) are respectively located directly above the two openings (301). A liquid exchange unit is installed on the pre-cooling cylinder (5).

2. The variable-frequency motor with an adaptive noise reduction device according to claim 1, wherein: The cross-section of the cooling groove (203) is an open ring shape, and the angle corresponding to the openings of the two is not greater than 30°. The two liquid guiding holes (202) on the bearing housing (201) respectively correspond to the two ends of the cooling groove (203).

3. The variable-frequency motor with an adaptive noise reduction device according to claim 2, characterized in that: The micro-gap unit (3) includes a plurality of micro-gap sheets (321), a plurality of transfer sheets (322) respectively fixedly connected to one corner at the upper end of the micro-gap sheets (321), a plurality of upper liquid guiding pipes (323) respectively fixedly connected between the plurality of transfer sheets (322), and a plurality of lower liquid guiding pipes (324) respectively fixedly connected between one corner at the lower ends of adjacent two micro-gap sheets (321). The lower liquid guiding pipe (324) and the transfer sheet (322) are at an oblique angle corresponding to each other, and the micro-gap sheet (321) is located at the corner on the side close to the horizontal center line of the motor body (1).

4. A variable-frequency motor with an adaptive noise reduction device according to claim 3, characterized in that: The micro-gap sheet (321) is a hollow sheet structure, and the width of the internal space of the micro-gap sheet (321) is 1-3 mm. The distance between adjacent two micro-gap sheets (321) is 3-5 times the width of the internal space of the micro-gap sheet (321).

5. The variable-frequency motor with an adaptive noise reduction device according to claim 1, wherein: The liquid exchange unit includes a retaining ring (501) fixedly connected to the outer end of the pre-cooling cylinder (5) close to the micro-gap unit (3), an electromagnetic ring (72) sleeved on the outer end of the pre-cooling cylinder (5), a liquid deflecting sheet (6) slidably fitted in the pre-cooling cylinder (5), and a plurality of electric push rods (71) fixedly connected between the retaining ring (501) and the electromagnetic ring (72). The liquid deflecting sheet (6) corresponds to the electromagnetic ring (72).

6. The variable frequency motor with an adaptive noise reduction device according to claim 5, characterized in that: The liquid deflecting sheet (6) is a porous plate structure, and a plurality of iron sheets are fixedly embedded on the outer ring surface of the liquid deflecting sheet (6). There is an adsorption force between the iron sheets and the electromagnetic ring (72).

7. The variable-frequency motor with an adaptive noise reduction device according to claim 5, characterized in that: There are two retaining rings (501), electric push rods (71), and electromagnetic rings (72) respectively. Two guide rods are fixedly connected between the left and right inner walls of the pre-cooling cylinder (5). The guide rods include two large-diameter rods (81) and a small-diameter rod (82) fixedly connected between the two large-diameter rods (81).

8. The variable-frequency motor with an adaptive noise reduction device according to claim 7, wherein: The liquid deflector (6) includes an inner circular plate (62) and two outer magnetic rings (61) corresponding to the two electromagnetic rings (72) respectively. The inner circular plate (62) is located between the two outer magnetic rings (61). The inner wall of the outer magnetic ring (61) contacts the outer surface of the large-diameter rod (81), and both of the two small-diameter rods (82) movably penetrate through the inner circular plate (62).

9. A variable-frequency motor with an adaptive noise reduction device according to claim 8, characterized in that: The large-diameter rod (81) and the small-diameter rod (82) are coaxially arranged, and the outer diameter of the large-diameter rod (81) is larger than the outer diameter of the small-diameter rod (82). The inner diameter of the outer magnetic ring (61) is smaller than the outer diameter of the inner circular plate (62).

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