Ventilation therapy equipment, fans and motors

Abstract

The present invention discloses a motor, including a housing, a stator and a rotor arranged inside the housing, shaft holes are arranged at both ends of the housing, and both ends of the rotating shaft of the rotor are supported in the shaft holes by bearings. The motor also includes a bearing sleeve arranged in at least one shaft hole, and one end of the bearing is fixedly matched with the bearing sleeve, and the other end of the bearing is fixedly matched with the shaft hole. The present invention can effectively avoid relative sliding between the bearing and the housing; and when the bearing moves eccentrically, the bearing sleeve can be used for buffering, thereby avoiding relative compression between the bearing and the housing to damage the bearing or the housing.

Description

Technical Field

[0001] The present invention relates to the field of medical health, and in particular to a ventilation treatment device, a fan and a motor thereof. Background Art

[0002] With the rapid development of society, the electric motor, as a machine that can convert electrical energy into mechanical energy, mainly includes an electromagnet winding or a distributed stator winding for generating a magnetic field and a rotating armature or rotor. Under the action of the rotating magnetic field of the stator winding, current flows through the effective side of the stator winding and is rotated by the magnetic field. In addition to many machines used in daily life, electric motors are also used in various equipment in the medical field, such as bi-level ventilators and oxygen concentrators.

[0003] In the application of bi-level ventilators and oxygen concentrators, the fan needs to switch between low pressure and high pressure at a certain frequency. The high and low pressure are achieved by the speed at which the fan blades are driven by the motor in the fan. Therefore, when the fan switches between low pressure and high pressure, the fan blades need to be accelerated or decelerated rapidly by the motor. Existing motors generally include a housing, a rotor and a bearing; wherein the housing is provided with an accommodating space, the bearing is sleeved on the rotor, the bearing and the rotor are both located in the accommodating space, and the outer wall of the bearing is tightly attached to the inner wall of the housing and fixed by the inner shell. However, the existing motors have the following defects in actual operation: when the motor is rapidly accelerated or decelerated, the friction force of the outer ring of the bearing on the inner ball of the bearing will increase, and when this friction force is greater than the friction force between the housing and the outer ring of the bearing, the outer ring of the bearing will rotate with the rotor, and the outer ring of the bearing will generate friction with the inner wall of the housing at this time, and the friction between the bearing and the housing will cause the temperature of the bearing itself to rise sharply, and at the same time, the inner wall of the bearing or the housing will be rubbed and a lot of debris will fall off, and under the combined effect of the rapidly increased temperature and the friction debris, the rotor of the motor will not be able to rotate or the motor will burn out.

[0004] Therefore, there is an urgent need for a motor that can stably connect the bearing and the housing to overcome the above-mentioned defects. Summary of the invention

[0005] An object of the present invention is to provide a motor in which a bearing and a housing are stably connected.

[0006] Another object of the present invention is to provide a fan, comprising a motor that stably connects a bearing and a housing.

[0007] Another object of the present invention is to provide a ventilation therapy device, which includes a blower having a motor that firmly connects a bearing and a housing.

[0008] In order to achieve the above-mentioned purpose, the present invention provides a motor, including a shell and a stator and a rotor arranged inside the shell, wherein the shell is provided with axial holes at both ends, and the two ends of the rotating shaft of the rotor are supported in the axial holes through bearings. The motor also includes a bearing sleeve arranged in at least one of the axial holes, and one end of the bearing is fixedly matched with the bearing sleeve, and the other end of the bearing is fixedly matched with the axial hole.

[0009] Preferably, the motor comprises two bearing sleeves, and the two bearing sleeves are arranged facing each other on one side of the two shaft holes close to the rotor.

[0010] Preferably, there is interference fit between the bearing and the bearing sleeve, and between the bearing sleeve and the shaft hole, and the unit friction force of the bearing sleeve on the bearing is greater than the unit friction force of the shaft hole on the bearing.

[0011] Preferably, the friction coefficient of the bearing is greater than the friction coefficient of the side wall of the shaft hole.

[0012] Preferably, the interference between the first end of the bearing and the bearing sleeve is greater than the interference between the second end of the bearing and the shaft hole.

[0013] Preferably, the shaft hole is a stepped hole, the bearing sleeve is fixedly arranged at the large diameter of the stepped hole, and the small diameter of the stepped hole is fixedly matched with the bearing.

[0014] Preferably, a protrusion is provided on one of the portion of the axial hole for assembling the bearing sleeve and the outer wall of the bearing sleeve, and a groove matching the protrusion is provided on the other portion of the axial hole for assembling the bearing sleeve and the outer wall of the bearing sleeve, and the bearing sleeve is assembled in the axial hole by snap-fitting the protrusion and the groove.

[0015] Preferably, a groove is provided at a step transition of the step hole, and a first convex ring is provided at one end of the bearing sleeve, and the first convex ring is clamped in the groove.

[0016] Preferably, a second convex ring is provided at the other end of the bearing sleeve.

[0017] Preferably, a first chamfer is provided on an outer side wall of the first convex ring away from the second convex ring, and / or a second chamfer is provided on an inner side wall of the second convex ring away from the first convex ring.

[0018] Preferably, the first convex ring is located in the shaft hole, and the second convex ring is located outside the shaft hole and abuts against the shaft hole.

[0019] In order to achieve the above object, the present invention provides a fan, which includes a fan blade and the above motor, wherein the rotating shaft of the rotor of the motor is fixedly matched with the fan blade.

[0020] In order to achieve the above object, the present invention provides a ventilation therapy device, which includes the above-mentioned fan.

[0021] Compared with the prior art, since the motor of the present invention also includes a bearing sleeve arranged in at least one shaft hole, and one end of the bearing is fixedly matched with the bearing sleeve, and the other end of the bearing is fixedly matched with the shaft hole, relative sliding between the bearing and the housing can be effectively avoided; and when the bearing undergoes eccentric motion, it can be buffered by the bearing sleeve, thereby avoiding relative compression between the bearing and the housing and damaging the bearing or the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the motor of the present invention.

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of the bearing sleeve of the motor of the present invention.

[0024] Figure 3 It is a cross-sectional view of the bearing sleeve of the motor of the present invention. DETAILED DESCRIPTION

[0025] In order to explain the technical content, structural features and achieved effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0026] Please refer to Figures 1 to 3 A motor 100 of the present invention includes a housing 10 and a stator and a rotor 20 arranged inside the housing 10. Shaft holes 10a are arranged at both ends of the housing 10. Both ends of the rotating shaft of the rotor 20 are supported in the shaft holes 10a through bearings 30. The motor 100 also includes a bearing sleeve 40 arranged in at least one shaft hole 10a, and one end of the bearing 30 is fixedly matched with the bearing sleeve 40, and the other end of the bearing 30 is fixedly matched with the shaft hole 10a.

[0027] In a specific embodiment, the motor 100 includes two bearing sleeves 40, which are arranged opposite to each other on one side of the two shaft holes 10a close to the rotor 20, but not limited thereto; more specifically, the bearing 30 and the bearing sleeve 40 and the bearing sleeve 40 and the shaft hole 10a are both interference fit, and the unit friction force of the bearing sleeve 40 on the bearing 30 is greater than the unit friction force of the shaft hole 10a on the bearing 30. For example, to make the unit friction force of the bearing sleeve 40 on the bearing 30 greater than the unit friction force of the shaft hole 10a on the bearing 30, the following conditions can be met: the friction coefficient of the bearing 30 is greater than the friction coefficient of the side wall of the shaft hole 10a; or the interference between the first end 31 of the bearing 30 and the bearing sleeve 40 is greater than the interference between the second end 32 of the bearing 30 and the shaft hole 10a; or the above two conditions are met at the same time, but not limited thereto. Preferably, the shaft hole 10a is a step hole, the bearing sleeve 40 is fixedly arranged at the large diameter of the step hole, and the small diameter of the step hole is fixedly matched with the bearing 30. It is worth noting that the bearing sleeve 40 in the present invention will not rotate relative to the housing 10, but is not limited thereto. More specifically, as follows:

[0028] Please continue to refer to Figures 1 to 3 , a groove 11 is provided at the part of the shaft hole 10a used for assembling the bearing sleeve 40, and a protrusion matching the groove 11 is provided on the outer wall of the bearing sleeve 40. The bearing sleeve 40 is assembled in the shaft hole 10a by the engagement and fixation of the protrusion and the groove 11, so that the bearing 30 can be effectively prevented from sliding along the shaft hole 10a when the bearing sleeve 40 is inserted into the bearing sleeve 40; in other embodiments, a protrusion can also be provided at the part of the shaft hole 10a used for assembling the bearing sleeve 40, and a groove matching the protrusion 11 is provided on the outer wall of the bearing sleeve 40, but it is not limited thereto. Specifically, the bearing sleeve 40 has elasticity. For example, the bearing sleeve 40 can be made of materials such as plastic and rubber, but it is not limited thereto.

[0029] Please continue to refer to Figures 1 to 3 , a first convex ring 41, i.e. a protrusion, is provided at one end of the bearing sleeve 40; a second convex ring 42 is provided at the other end of the bearing sleeve 40, and a groove 11 is provided at the step transition of the step hole, and the first convex ring 41 is clamped in the groove 11. Specifically, a first chamfer 411 is provided on the outer side wall of the first convex ring 41 away from the second convex ring 42, so when the bearing sleeve 40 is inserted into the housing 10, it can be smoother under the guidance of the first chamfer 411; more specifically, a second chamfer 421 is provided on the inner side wall of the second convex ring 42 away from the first convex ring 41, so that the bearing 30 can be inserted into the bearing sleeve 40 under the guidance of the second chamfer 421, but not limited to this. For example, the first chamfer 411 and the second chamfer 421 can be 60 degrees, but not limited to this. It is worth noting that, if Figure 1As shown, the first convex ring 411 of the motor 100 of the present invention is located in the shaft hole 10a, and the second convex ring 421 is located outside the shaft hole 10a and abuts against the shaft hole 10a. Therefore, when the bearing 30 is installed in the housing 10, it is only necessary to insert the first convex ring 41 into the shaft hole 10a, and then snap the bearing sleeve 40 and the shaft hole 10a together to fix them, without having to insert the entire bearing sleeve 40 into the shaft hole 10a, so it is convenient for the installation and removal of the bearing sleeve 40. Specifically, the bearing sleeve 40 and the bearing 30 are in surface contact, so compared with the line contact formed between the existing O-shaped fastening ring and the bearing 30, the bearing sleeve 40 of the present invention increases the contact area with the bearing 30, thereby making the set between the bearing sleeve 40 and the bearing 30 more stable, but it is not limited to this.

[0030] In other embodiments, the motor 100 is provided with only one bearing sleeve 30 , and the bearing sleeve 30 can be provided in any one of the two shaft holes 10 a .

[0031] It is worth noting that the present invention also discloses a ventilation therapy device, which includes a fan having the above-mentioned motor 100. For example, the ventilation therapy device can be a ventilator or an oxygen generator, but is not limited thereto.

[0032] Compared with the prior art, since the motor 100 of the present invention also includes a bearing sleeve 40 arranged in at least one axial hole 10a, and one end of the bearing 30 is fixedly matched with the bearing sleeve 40, and the other end of the bearing 30 is fixedly matched with the axial hole 10a, relative sliding between the bearing 30 and the housing 10 can be effectively avoided; and when the bearing 30 undergoes eccentric motion, it can be buffered by the bearing sleeve 40, thereby avoiding relative extrusion between the bearing 30 and the housing 10 to damage the bearing 30 or the housing 10.

[0033] The above disclosure is only a preferred embodiment of the present invention, which is to facilitate the understanding and implementation of the present invention by those skilled in the art. It certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A motor, comprising a housing, and a stator and a rotor arranged inside the housing, wherein two ends of the housing are provided with shaft holes, and two ends of the rotating shaft of the rotor are supported in the shaft holes through bearings, characterized in that: The motor also includes a bearing sleeve arranged in at least one of the shaft holes, and one end of the bearing is fixedly matched with the bearing sleeve, and the other end of the bearing is fixedly matched with the shaft hole, the bearing sleeve is elastic, the shaft hole is a step hole, the bearing sleeve is fixedly arranged at the large diameter of the step hole, and the small diameter of the step hole is fixedly matched with the bearing, a protrusion is provided on one of the parts of the shaft hole used to assemble the bearing sleeve and the outer wall of the bearing sleeve, a groove matching the protrusion is provided on the other part of the shaft hole used to assemble the bearing sleeve and the outer wall of the bearing sleeve, and the bearing sleeve is assembled in the shaft hole by the engagement and fixing of the protrusion and the groove.

2. The motor according to claim 1, characterized in that: The motor comprises two bearing sleeves, and the two bearing sleeves are arranged facing each other on one side of the two shaft holes close to the rotor.

3. The motor according to claim 1, characterized in that: The bearing and the bearing sleeve as well as the bearing sleeve and the shaft hole are all interference fit, and the unit friction force of the bearing sleeve on the bearing is greater than the unit friction force of the shaft hole on the bearing.

4. The motor according to claim 1, characterized in that: The friction coefficient of the bearing is greater than the friction coefficient of the side wall of the shaft hole.

5. The motor according to claim 1 or 2, characterized in that: The interference between the first end of the bearing and the bearing sleeve is greater than the interference between the second end of the bearing and the shaft hole.

6. The motor according to claim 1, characterized in that: A groove is arranged at the step transition of the step hole, and a first convex ring is arranged at one end of the bearing sleeve, and the first convex ring is clamped in the groove.

7. The motor according to claim 6, characterized in that: The other end of the bearing sleeve is provided with a second convex ring.

8. The motor according to claim 7, characterized in that: A first chamfer is formed on an outer side wall of the first convex ring away from the second convex ring, and / or a second chamfer is formed on an inner side wall of the second convex ring away from the first convex ring.

9. The motor according to claim 7, characterized in that: The first convex ring is located in the shaft hole, and the second convex ring is located outside the shaft hole and abuts against the shaft hole.

10. A fan, characterized in that: It comprises a fan blade and the motor according to any one of claims 1 to 9, wherein the rotating shaft of the rotor of the motor is fixedly matched with the fan blade.

11. A ventilation therapy device, characterized in that: The ventilation therapy device comprises the blower according to claim 10.

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