Single-phase asynchronous capacitor motor

Abstract

The invention relates to a single-phase asynchronous capacitor motor, which comprises a stator part, a rotor part and a motor rotating shaft, the capacitor motor further comprises a casing, the casing comprises a front casing wall, a rear casing wall and a ventilation rear cover, the front end part of the motor rotating shaft is coupled in the front casing wall through a front bearing, and the rear end part of the motor rotating shaft is coupled in the rear casing wall through a rear bearing. The rear end part of the motor rotating shaft is coupled in the rear shell wall through a rear bearing, the rear bearing comprises an outer bearing sleeve, an inner bearing sleeve and a bearing roller, the inner bearing sleeve is fixedly sleeved on the rear end part of the motor rotating shaft, the inner bearing sleeve comprises an inner bearing ring pipe and a connecting disc body, and the inner bearing ring pipe is sleeved on the inner bearing ring pipe. The connecting disc body is fixedly connected to the outer end of the inner bearing ring pipe, the coaxial cooling fan is connected to the connecting disc body, when the inner bearing sleeve rotates, the connecting disc body and the motor rotating shaft coaxially and synchronously rotate, and the connecting disc body drives the coaxial cooling fan and the motor rotating shaft to coaxially and synchronously rotate.

Description

Technical Field

[0001] This invention relates to a capacitor motor, and more particularly to a single-phase asynchronous capacitor motor with a coaxial cooling fan connected to the rear bearing. Background Technology

[0002] As is well known, a single-phase asynchronous capacitor motor (also known as a single-phase capacitor asynchronous motor or single-phase induction motor) is a common type of AC motor. It is powered by a single-phase power supply and uses the phase difference generated by the capacitor to start and run. Its working principle is that during startup, the capacitor is connected in series with the auxiliary winding, generating a phase difference that forms a rotating magnetic field, causing the rotor to rotate. After reaching the rated speed, some designs (such as capacitor-start type) disconnect the starting capacitor through a centrifugal switch, while capacitor-run type keeps the capacitor connected to optimize operating efficiency. Its main characteristics are: firstly, its simple structure, with the stator containing both main and starting windings, and the rotor being a squirrel-cage type, resulting in small size and low cost; secondly, its capacitor-start type has a larger torque (up to 2-3 times the rated torque), suitable for equipment with high starting loads; the capacitor-run type runs more smoothly but has a smaller starting torque.

[0003] Currently, single-phase asynchronous capacitor motors are mainly used in many products such as electric fans, washing machines, vacuum cleaners, water pumps, compressors, and small machine tools. In practice, they have many advantages such as reliable starting, convenient maintenance, and low noise.

[0004] The aforementioned traditional single-phase asynchronous capacitor motor generates heat during operation. To cool the motor, a fan structure is generally installed inside the motor.

[0005] like Figure 1 The image shows the heat dissipation structure of a traditional electric motor, which includes a shaft 1, a rotor 2, a stator 3, and a fan assembly 4. The rotating shaft 1 is installed in the rotor 2, and the fan component 4 is directly sleeved on the end of the rotating shaft 1. When working, the rotor 2 drives the rotating shaft 1 to rotate, and the rotating shaft 1 synchronously drives the fan component 4 to rotate. The rotation of the fan component 4 causes airflow, thereby achieving the effect of heat dissipation.

[0006] However, in the above structure, since the fan component 4 is directly sleeved on the end of the shaft 1, when the fan component 4 causes airflow, the force of the air on the fan component 4 will inevitably be directly transmitted to the shaft 1, which will affect the smoothness of the rotation of the shaft 1. This is the main drawback of the prior art. Summary of the Invention

[0007] The technical solution adopted in this invention is as follows: a single-phase asynchronous capacitor motor, comprising a stator, a rotor, and a motor shaft, wherein the motor shaft is disposed in the rotor, the stator is disposed around the rotor, the motor shaft has a front end, a rear end, and a middle end, wherein the rotor is disposed on the middle end, and the front end is the power output end of the motor. The capacitor motor also includes a housing, which includes a front housing wall, a rear housing wall, and a ventilated rear cover. The front end of the motor shaft is connected to the front housing wall via a front bearing, and the rear end of the motor shaft is connected to the rear housing wall via a rear bearing. The stator and the rotor are disposed between the front housing wall and the rear housing wall.

[0008] The rear bearing includes an outer bearing sleeve, an inner bearing sleeve, and bearing rollers. The bearing rollers are rolled between the outer bearing sleeve and the inner bearing sleeve. The outer bearing sleeve is fixedly inserted into the rear housing wall. The inner bearing sleeve is fixedly sleeved on the rear end portion of the motor shaft. The inner bearing sleeve includes an inner bearing annular tube and a connecting disc. The inner bearing annular tube is fixedly sleeved on the rear end portion of the motor shaft. The connecting disc is fixedly connected to the outer end of the inner bearing annular tube. A coaxial cooling fan is connected to the connecting disc. The inner bearing sleeve and the motor shaft rotate coaxially and synchronously. When the inner bearing sleeve rotates, the connecting disc rotates coaxially and synchronously with the motor shaft. The connecting disc drives the coaxial cooling fan to rotate coaxially and synchronously with the motor shaft.

[0009] The coaxial cooling fan is disposed between the rear housing wall and the ventilation rear cover. The ventilation rear cover has several heat dissipation holes and a central pivot hole. The coaxial cooling fan includes a connecting body, a blade unit, and a pivot joint. The connecting body is connected to the connecting plate of the inner bearing sleeve. The pivot joint is inserted into the central pivot hole of the ventilation rear cover. The blade unit is disposed between the connecting body and the pivot joint. When the motor shaft rotates, the blade unit is driven to rotate coaxially and synchronously with the motor shaft through the connecting plate and the connecting body.

[0010] The aforementioned pivot joint includes a bearing end cover, end cover rollers, and an end shaft. The bearing end cover is fixedly installed in the central pivot hole of the ventilation rear cover, the end shaft is fixedly installed at the end of the blade unit, and several end cover rollers are rotatably installed between the bearing end cover and the end shaft.

[0011] The blade unit includes a fan ring wall, the diameter of which decreases from the rear shell wall toward the ventilation rear cover. Several disc blades are arranged on the fan ring wall, and a compressed air channel is formed between any two adjacent disc blades. Each disc blade has an inclined outer blade surface and an inclined inner blade surface, which are located on both sides of the disc blade. The compressed air channel between two adjacent disc blades is located between the inclined inner blade surface of one disc blade and the inclined outer blade surface of another disc blade. The conical blade unit and several compressed air channels can increase the air velocity.

[0012] The beneficial effects of this invention are as follows: In the prior art, since the fan component is directly sleeved on the end of the shaft, when the fan component generates airflow, the force of the air on the fan component will inevitably be directly transmitted to the shaft, thus affecting the smoothness of the shaft rotation. This invention creatively assembles the coaxial cooling fan on the inner bearing sleeve. Since the rear shell wall and the motor shaft on both sides of the inner bearing sleeve can provide fixing forces F and F respectively, the rotational smoothness of the inner bearing sleeve is much better than that of the extended end of the motor shaft. Therefore, assembling the coaxial cooling fan on the inner bearing sleeve can improve the movement smoothness of the coaxial cooling fan. In addition, by assembling the coaxial cooling fan on the inner bearing sleeve, this invention can significantly reduce the influence of the coaxial cooling fan on the motor shaft. That is to say, the rotational force of the coaxial cooling fan will not directly act on the motor shaft, thereby significantly improving the rotational smoothness of the motor shaft. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the existing technology.

[0014] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0015] Figure 3 This is another cross-sectional schematic diagram of the present invention.

[0016] Figure 4 This is an exploded view of the present invention.

[0017] Figure 5 This is a schematic diagram of the coaxial cooling fan of the present invention.

[0018] Figure 6 This is a schematic diagram of the structure of the disk blade of the present invention.

[0019] Figure 7 This is a schematic diagram of the compressed air channel of the present invention.

[0020] Figure 8 This is a schematic diagram of the coaxial rod of the present invention.

[0021] Figure 9 This is a schematic diagram of the inclined ring disk connected to the inclined connecting surface according to the present invention.

[0022] Figure 10 This is a schematic diagram of the inclined inner surface and inclined outer surface of the pivot joint of the present invention. Detailed Implementation

[0023] like Figures 2 to 10 As shown, a single-phase asynchronous capacitor motor includes a stator portion 10, a rotor portion 20, and a motor shaft 30, wherein the motor shaft 30 is disposed in the rotor portion 20, and the stator portion 10 is disposed around the rotor portion 20.

[0024] The motor shaft 30 has a front end portion 31, a rear end portion 32, and a middle end portion 33. The rotor portion 20 is disposed on the middle end portion 33, and the front end portion 31 is the power output end of the motor.

[0025] The capacitor motor also includes a housing, which includes a front housing wall 40, a rear housing wall 50, and a ventilated rear cover 60. The front end portion 31 of the motor shaft 30 is axially connected to the front housing wall 40 via a front bearing 41, and the rear end portion 32 of the motor shaft 30 is axially connected to the rear housing wall 50 via a rear bearing 100. The stator portion 10 and the rotor portion 20 are disposed between the front housing wall 40 and the rear housing wall 50.

[0026] The rear bearing 100 includes an outer bearing sleeve 110, an inner bearing sleeve 120, and a bearing roller 130. The bearing roller 130 is rotatably disposed between the outer bearing sleeve 110 and the inner bearing sleeve 120. The outer bearing sleeve 110 is fixedly inserted into the rear housing wall 50, and the inner bearing sleeve 120 is fixedly sleeved on the rear end portion 32 of the motor shaft 30.

[0027] The inner bearing sleeve 120 includes an inner bearing ring tube 140 and a connecting disc 150. The inner bearing ring tube 140 is fixedly sleeved on the rear end portion 32 of the motor shaft 30, and the connecting disc 150 is fixedly connected to the outer end of the inner bearing ring tube 140.

[0028] A coaxial cooling fan 200 is connected to the connection plate 150.

[0029] The inner bearing sleeve 120 rotates coaxially and synchronously with the motor shaft 30. When the inner bearing sleeve 120 rotates, the connecting plate 150 rotates coaxially and synchronously with the motor shaft 30. The connecting plate 150 drives the coaxial cooling fan 200 to rotate coaxially and synchronously with the motor shaft 30.

[0030] In the prior art, since the fan component 4 is directly sleeved on the end of the shaft 1, when the fan component 4 causes airflow, the force of the air on the fan component 4 will inevitably be directly transmitted to the shaft 1, which will affect the smoothness of the rotation of the shaft 1.

[0031] The present invention creatively assembles the coaxial cooling fan 200 onto the inner bearing sleeve 120. Since the rear shell wall 50 and the motor shaft 30 on both sides of the inner bearing sleeve 120 can provide fixing force for the inner bearing sleeve 120, the rotational smoothness of the inner bearing sleeve 120 is much better than that of the extended end of the motor shaft 30.

[0032] Therefore, assembling the coaxial cooling fan 200 onto the inner bearing sleeve 120 can improve the smoothness of the coaxial cooling fan 200's movement.

[0033] In addition, by assembling the coaxial cooling fan 200 onto the inner bearing sleeve 120, the present invention can significantly reduce the impact of the coaxial cooling fan 200 on the motor shaft 30. In other words, the rotational force of the coaxial cooling fan 200 will not directly act on the motor shaft 30, thereby significantly improving the rotational stability of the motor shaft 30.

[0034] like Figure 2 The middle arrow indicates a schematic diagram of the coaxial cooling fan 200 driving airflow.

[0035] The coaxial cooling fan 200 is disposed between the rear shell wall 50 and the ventilation rear cover 60, wherein the ventilation rear cover 60 is provided with several heat dissipation holes 61 and a central pivot hole 62.

[0036] The coaxial cooling fan 200 includes a connector 210, a blade unit 220, and a pivot joint 230. The connector 210 is connected to the connecting plate 150 of the inner bearing sleeve 120. The pivot joint 230 is inserted into the central pivot hole 62 of the ventilation rear cover 60. The blade unit 220 is disposed between the connector 210 and the pivot joint 230. When the motor shaft 30 rotates, the blade unit 220 is driven to rotate coaxially and synchronously with the motor shaft 30 through the connecting plate 150 and the connector 210.

[0037] In specific implementation, the pivot joint 230 includes a bearing end cover 231, an end cover roller 232, and an end shaft 233. The bearing end cover 231 is fixedly installed in the central pivot hole 62 of the ventilation rear cover 60, the end shaft 233 is fixedly installed at the end of the blade unit 220, and several end cover rollers 232 are rolled between the bearing end cover 231 and the end shaft 233.

[0038] like Figures 6 to 7 As shown, in a specific implementation, the blade unit 220 is generally conical in shape. The blade unit 220 includes a fan ring wall 221, the diameter of which decreases from the rear shell wall 50 toward the ventilation rear cover 60.

[0039] The fan ring wall 221 is provided with several disc blades 222. Any two adjacent disc blades 222 form a compressed air channel 223. Each disc blade 222 has an inclined outer blade surface 224 and an inclined inner blade surface 225. The inclined outer blade surface 224 and the inclined inner blade surface 225 are located on both sides of the disc blade 222. The compressed air channel 223 between two adjacent disc blades 222 is located between the inclined inner blade surface 225 of one disc blade 222 and the inclined outer blade surface 224 of another disc blade 222. The design of the conical blade unit 220 and several compressed air channels 223 can increase the airflow speed and greatly improve the heat dissipation effect.

[0040] like Figure 8 As shown, in a specific implementation, the pivot joint 230 of the coaxial cooling fan 200 also includes a coaxial rod 240. One end of the coaxial rod 240 is fixedly connected to the end shaft 233 of the pivot joint 230, and the other end of the coaxial rod 240 is inserted into the end face 321 of the rear end portion 32 of the motor shaft 30. The coaxial rod 240 can play an auxiliary positioning role, so that the coaxial cooling fan 200 and the motor shaft 30 can rotate more stably and synchronously.

[0041] In specific implementation, a key 241 is provided on the coaxial rod 240, and a keyway 242 is provided in the end face 321 of the rear end portion 32 of the motor shaft 30 corresponding to the key 241, and the key 241 is inserted into the keyway 242.

[0042] like Figure 9 As shown, in a specific implementation, the connecting disc 150 of the inner bearing sleeve 120 has an inclined connecting surface 151, and the angle between the inclined connecting surface 151 and the axis of the motor shaft 30 is an acute angle. The connecting body 210 of the coaxial cooling fan 200 is an inclined ring disc, which is connected to the inclined connecting surface 151. The above-described structure of the present invention can make the structure of the blade unit 220 more compact.

[0043] like Figure 10As shown, in a specific implementation, the bearing end cap 231 of the pivot joint 230 has an inclined inner surface 251. Corresponding to the inclined inner surface 251, the end shaft 233 of the pivot joint 230 has an inclined outer surface 252. Several end cap rollers 232 are rolled between the inclined inner surface 251 and the inclined outer surface 252. The above structure enables the end shaft 233 to rotate more stably in the bearing end cap 231. The inclined inner surface 251 and the inclined outer surface 252 are parallel.

Claims

1. A single-phase asynchronous capacitor motor, comprising a stator, a rotor, and a motor shaft, wherein, The motor shaft is located within the rotor section, and the stator section is positioned around the rotor section. The motor shaft has a front end, a rear end, and a middle section, with the rotor section located on the middle section. The front end is the power output terminal of the motor. The capacitor motor also includes a housing, which includes a front housing wall, a rear housing wall, and a ventilated rear cover. The front end of the motor shaft is connected to the front housing wall via a front bearing, and the rear end of the motor shaft is connected to the rear housing wall via a rear bearing. The stator and rotor portions are disposed between the front and rear housing walls. The characteristic feature is that: The rear bearing includes an outer bearing sleeve, an inner bearing sleeve, and bearing rollers. The bearing rollers are rolled between the outer bearing sleeve and the inner bearing sleeve. The outer bearing sleeve is fixedly inserted into the rear housing wall. The inner bearing sleeve is fixedly sleeved on the rear end portion of the motor shaft. The inner bearing sleeve includes an inner bearing annular tube and a connecting disc. The inner bearing annular tube is fixedly sleeved on the rear end portion of the motor shaft. The connecting disc is fixedly connected to the outer end of the inner bearing annular tube. A coaxial cooling fan is connected to the connecting disc. The inner bearing sleeve and the motor shaft rotate coaxially and synchronously. When the inner bearing sleeve rotates, the connecting disc rotates coaxially and synchronously with the motor shaft, thereby driving the coaxial cooling fan to rotate coaxially and synchronously with the motor shaft. The coaxial cooling fan is disposed between the rear housing wall and the ventilation rear cover. The ventilation rear cover has several heat dissipation holes and a central pivot hole. The coaxial cooling fan includes a connecting body, a blade unit, and a pivot joint. The connecting body is connected to the connecting plate of the inner bearing sleeve. The pivot joint is inserted into the central pivot hole of the ventilation rear cover. The blade unit is disposed between the connecting body and the pivot joint. When the motor shaft rotates, the blade unit is driven to rotate coaxially and synchronously with the motor shaft through the connecting plate and the connecting body.

2. A single-phase asynchronous capacitor motor as described in claim 1, characterized in that: The pivot joint includes a bearing end cap, end cap rollers, and an end shaft. The bearing end cap is fixedly disposed in the central pivot hole of the ventilation rear cover, and the end shaft is fixedly disposed at the end of the blade unit. Several end cap rollers are rotatably disposed between the bearing end cap and the end shaft. The blade unit includes a fan ring wall, the diameter of which decreases from the rear shell wall toward the ventilation rear cover. Several disc blades are arranged on the fan ring wall, and a compressed air channel is formed between any two adjacent disc blades. Each disc blade has an inclined outer blade surface and an inclined inner blade surface, which are located on both sides of the disc blade. The compressed air channel between two adjacent disc blades is located between the inclined inner blade surface of one disc blade and the inclined outer blade surface of another disc blade. The conical blade unit and several compressed air channels can increase the air velocity.

3. A single-phase asynchronous capacitor motor as described in claim 2, characterized in that: The blade unit is conical in shape.

4. A single-phase asynchronous capacitor motor as described in claim 2, characterized in that: The pivot joint of the coaxial cooling fan also includes a coaxial rod, one end of which is fixedly connected to the end shaft of the pivot joint, and the other end of which is inserted into the end face of the rear end portion of the motor shaft.

5. A single-phase asynchronous capacitor motor as described in claim 4, characterized in that: The coaxial rod is provided with a key, and a keyway is provided in the end face of the rear end portion of the motor shaft corresponding to the key, and the key is inserted into the keyway.

6. A single-phase asynchronous capacitor motor as described in claim 2, characterized in that: The connecting disc of the inner bearing sleeve has an inclined connecting surface, and the angle between the inclined connecting surface and the axis of the motor shaft is an acute angle. The connecting body of the coaxial cooling fan is an inclined ring disc, and the inclined ring disc is connected to the inclined connecting surface.

7. A single-phase asynchronous capacitor motor as described in claim 2, characterized in that: The bearing end cap of the pivot joint has an inclined inner side, and corresponding to the inclined inner side, the end shaft of the pivot joint has an inclined outer surface, and several end cap rollers are rolled between the inclined inner side and the inclined outer surface.

8. A single-phase asynchronous capacitor motor as described in claim 7, characterized in that: The inclined inner surface is parallel to the inclined outer surface.

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