NZ759406B2 - Delivery of Respiratory Therapy - Google Patents

Abstract

magnetically-triggered lock mechanism for interengaging two relatively movable components, comprising a bolt displaceable between extended and retracted positions, the bolt mounted within a first component and interengageable with a second component when the first and second components are in a predetermined position relative to each other and the bolt is extended. The lock mechanism includes a magnetically-releasable latch mechanism positioned to latch the bolt in a retracted position, the latch mechanism including a first magnet and mounted for movement between a biased latch engaging position and a latch releasing position, and a second magnet positioned to displace the latch mechanism to the latch releasing position when the components are in the predetermined position relative to each other. The magnets are positioned to displace the latch mechanism to the latch releasing position as a result of magnetic repulsion when the components are in the predetermined position relative to each other. The problem that this lock mechanism addresses is to provide an improved bolt assembly which ensures that the bolt is extended only after the two components are in the appropriate position relative to each other, and that the bolt extends only after the components are in the appropriate position relative to each other. edetermined position relative to each other and the bolt is extended. The lock mechanism includes a magnetically-releasable latch mechanism positioned to latch the bolt in a retracted position, the latch mechanism including a first magnet and mounted for movement between a biased latch engaging position and a latch releasing position, and a second magnet positioned to displace the latch mechanism to the latch releasing position when the components are in the predetermined position relative to each other. The magnets are positioned to displace the latch mechanism to the latch releasing position as a result of magnetic repulsion when the components are in the predetermined position relative to each other. The problem that this lock mechanism addresses is to provide an improved bolt assembly which ensures that the bolt is extended only after the two components are in the appropriate position relative to each other, and that the bolt extends only after the components are in the appropriate position relative to each other.

Description

HEAT DISSIPATION STRUCTURE FOR MOTOR Technical Field of the Invention The present ion relates to a motor and in particular to a heat dissipation structure for a motor.

Background of the Invention As a power machine used widely, a motor converts electrical energy into mechanical energy to drive various mechanical s to operate. During the energy conversion by the motor, part of energy will be dissipated in a coil in form of heat. This part of , which is converted into heat, will heat the motor. If the heat cannot be dissipated in time, it is likely that a short circuit is caused due to the insulation failure of the coil of the motor or that the motor cannot operate normally due to other failures. In order to ensure the normal operation of the motor, heat dissipation ribs are arranged on a motor shell, and a heat dissipation fan is mounted at a tail end of a rotating shaft of the motor, so that the temperature rise of the motor during ion is controlled within a certain range. An air inlet and an air outlet are formed on a front end face and a rear end face of the motor, respectively, so the flow of air is realized by the axial-flow cooling fan so as to realize heat dissipation. r, in many cases, such as in a high-temperature operating environment, in a case of frequent activation/deactivation or forward/backward rotation of the motor, or in a case of long-term connection and operation of the motor, such a heat ation structure cannot ensure that the temperature of the motor is controlled within an allowable temperature rise range. As a , the motor cannot operate stably for a long time.

Summam of the Invention The present invention is aimed at providing a heat dissipation structure for a motor with better heat dissipation effect.

For this purpose, the present invention employs the following technical solutions. A heat dissipation structure for a motor is provided, wherein an air inlet and an air outlet are formed on the motor; a rotating shaft is arranged in the motor; a fan is fixed at a rear end of the rotating shaft; the fan includes a number of blades which are arranged radially and uniformly about an axis of the rotating shaft at intervals and arranged on an outer ferential side of the ng shaft; the air outlet is located on an outer circumferential side of the fan; the air inlet is located in front of the air outlet; the motor includes an enclosure portion on the outer circumferential side of the fan; the air outlet is formed in the enclosure portion; and, the distance from an inner ferential wall of the enclosure portion to an outer circumferential edge of the fan gradually increases from one end to the other end of the air outlet in a rotation ion of the rotating shaft.

Air is driven to flow from the air inlet to the air outlet by the rotation of the fan, so that heat is taken away by air flowing in the motor. When the air flows to the rear end of the motor, the air flows to the air outlet along the space n the fan and the enclosure portion. The enclosure portion is provided for guiding the air, and the ce from the inner wall of the enclosure portion to the fan (the distance from the enclosure portion to the rotating shaft) gradually increases such that hot air can be accumulated to generate an air pressure. Accordingly, it is convenient for exhausting hot air, thereby exhausting much hot air and improving the heat dissipation effect.

Preferably, the enclosure n has a circular inner edge, and the axis of the enclosure portion is eccentric from the axis of the fan. With this arrangement, it is convenient for guiding air, and is convenient for manufacturing, processing and assembling the motor.

Preferably, the fan includes a stop n which is located on a rear axial side of the blades; a ar slot running through the motor from front and rear sides to evade the stop portion is formed on the motor; the stop portion has a circular outer edge, and the stop portion is located in the circular slot; and, there is a gap between an outer circumferential wall of the stop portion and an inner circumferential wall of the circular slot. If there is no circular slot, there will be a certain distance from the fan at the rear end of the motor to the inner axial wall of the motor, so that the exhaust of hot air will be influenced and part of the hot air will flow between the fan and the inner axial wall of the motor.

With this arrangement, it is smoother to t the hot air, so that the exhaust amount of the hot air is increased.

Preferably, an outer edge of each of the blades is d on an outer circumferential side of the outer circumferential edge of the stop portion. The blades are used for guiding the hot air to reduce the impact of air entering the gap between the circular slot and the stop portion on the flow direction of the hot air, so that the flow rate of the hot air is ensured.

Preferably, a notch is formed at a rear end of the outer edge of each of the blades. With this arrangement, the fan is prevented from being hindered during its rotation. ably, a guide block is arranged at a rear end of the motor, an air exhaust groove communicated with the air outlet is formed on the guide block, and the orientation of the air t groove is the same as the rotation direction of the rotating shaft. With this arrangement, the exhaust effect of the hot air is improved.

Preferably, each of the blades of the fan includes an inner section and an outer section, an inner end of the outer section is connected to the inner n, and an outer end of the outer section extends toward a side away from the rotation direction of the rotating shaft. With this ement, the hot air is further guided, thereby improving the exhaust effect of the hot air. ably, the outer section is arc-shaped, and the arc shape of the outer section is open facing the side away from the rotation direction of the rotating shaft. With this arrangement, the hot air is better separated between two adjacent , thereby increasing the exhaust amount of the hot air and improving the heat dissipation effect.

Preferably, a rear end cover body and a housing are arranged at the rear end of the motor; the housing is located on a rear axial side of the rear end cover body; the circular slot is formed on the housing; the enclosure portion is arranged on the rear end cover body or the housing; a number of through grooves, running through the rear end cover body from front and rear sides to allow a gas to pass therethrough, are formed on the rear end cover body; and, a bearing chamber is formed on the rear end cover body, and the rotating shaft is fixed by a g. With this arrangement, it is convenient for manufacturing and assembling the motor of the present invention.

Preferably, an occlusion portion is arranged on an inner circumferential side or an outer circumferential side of the enclosure portion, and the ion portion and the ure portion are arranged on the rear end face body and the g, respectively; and, the housing is fixed on the rear side of the rear end cover body through a buckle structure, the buckle structure includes a male buckle and a female buckle, the male buckle is arranged on the enclosure portion, and the occlusion portion is d on the outer circumferential side of the enclosure portion. With this arrangement, it is convenient for manufacturing and assembling the motor of the t invenfion.

The present ion has the advantages of greater hot air exhaust amount and better heat dissipation effect.

Brief ption of the Drawings Fig. 1 is schematic structure diagram of a motor ing to the present invenfion; Fig. 2 is an axial section view of the motor according to the present invenfion; Fig. 3 is a radial section view of the present invention; Fig. 4 is a schematic structure diagram of a housing according to the present invention; Fig. 5 is a schematic ure diagram of a rear end cover body according to the present invention; and Fig. 6 is a schematic structure diagram of a fan according to the present Detailed Description of the Invention The present invention will be r described below by specific embodiments with reference to the accompanying drawings.

As shown in Figs. 1-6, the present invention provides a heat dissipation structure for a motor. An air inlet 11 and an air outlet 12 are formed on the motor 1. A rotating shaft 2 is arranged in the motor 1, and a fan 3 is fixed at a rear end of the rotating shaft 2. The fan 3 includes a number of blades 31 which are arranged radially about an axis of the rotating shaft 2 at m intervals and arranged on an outer circumferential side of the rotating shaft 2.

The air outlet 12 is located on an outer circumferential side of the fan 3. The air inlet 11 is located in front of the air outlet 12.

A rear end cover assembly is arranged at the rear end of the motor 1. The rear end cover assembly includes a rear end cover body 4 and a housing 5.

The housing 5 is located on a rear axial side of the rear end cover body 4. The rear end cover body 4 is fixed to a shell 10 of the motor through a fastening screw. Air is driven to flow from the air inlet to the air outlet by the rotation of the fan, so that heat is taken away by air flowing in the motor. When the air flows to the rear end of the motor, the air flows to the air outlet along the space between the fan and the enclosure portion. The enclosure portion is provided for guiding the air, and the distance from the inner wall of the enclosure portion to the fan (the ce from the enclosure portion to the rotating shaft) gradually increases such that hot air can be lated to generate an air pressure. Accordingly, it is convenient for exhausting hot air, thereby exhausting much hot air and improving the heat ation effect.

A number of through grooves 41, running through the rear end cover body 4 from front and rear sides to allow a gas to pass therethrough, are formed on the rear end cover body 4. A bearing chamber 42 is formed in a middle portion of the rear end cover body 4, and the rotating shaft 2 is fixed by a bearing 43.

An enclosure portion 44 extends backward from the rear end cover body 4.

The enclosure portion 44 is located on an outer circumferential side of the fan 3, and the fan is located between the housing 5 and the rear end cover body 4.

An occlusion portion 51 extending forward is formed on an edge of the housing . The housing 5 is fixed on a rear side of the rear end cover body 4 through a buckle structure. The buckle structure includes a male buckle 45 and a female buckle 52. The male buckle 45 is ed on an outer circumferential side of the enclosure portion 44, and the female buckle 52 is arranged on the housing . The housing 5 is fixed to the rear end cover body 4 such as the occlusion portion 51 is located on the outer circumferential side of the enclosure portion.

Notches radially g through the enclosure portion 44 and the occlusion portion 51 are formed on the enclosure portion 44 and the ion portion 51 to form the air outlet 12. A guide block 53 is arranged on the rear end cover ly. An air exhaust groove icated with the air outlet is formed on the guide block. The orientation of the air exhaust groove is the same as the on direction of the rotating shaft. The guide block 53 is arranged, by being divided into front and rear portions, on the rear end cover body 4 and the housing 5, respectively.

The enclosure portion 44 has a circular inner edge, and the axis of the enclosure n 44 is eccentric from the axis of the fan 3. The distance from an inner circumferential wall of the enclosure portion 44 to an outer circumferential edge of the fan 3 gradually ses from one end to the other end of the air outlet 12 in a rotation ion of the rotating shaft. In Fig. 3, the rotation shaft rotates along the shown clockwise direction.

The fan 3 further includes a stop portion 32 which is located on a rear axial side of the blades 31. A circular slot 54 running through the housing 5 from front and rear sides to evade the stop portion 32 is formed on the housing 5 of the motor. The stop portion 32 has a circular outer edge, and the stop portion 32 is d in the circular slot 54. There is a gap between an outer circumferential wall of the stop n 32 and an inner circumferential wall of the circular slot 54. A fixation portion 33 is arranged in a middle portion of the stop portion 32, and the fixation portion 33 is closely fitted at the rear end of the rotating shaft. All the blades 31 of the fan are fixed on the front side of the stop portion 32.

An outer edge of each of the blades 31 is located on an outer circumferential side of the outer circumferential edge of the stop portion 32, a notch 34 is formed at a rear end of the outer edge of each of the blades 31, and there is a gap n a rear end face of the outer edge of each of the blades 31 and a front end face of the housing 5. Each of the blades 31 of the fan 3 includes an inner section 311 and an outer section 312. An inner end of the outer section 312 is connected to the inner section 311, and an outer end of the outer section 312 extends toward a side away from the rotation direction of the rotating shaft. The outer section 312 is arc-shaped, and the arc shape of the outer section 312 is open facing the side away from the rotation ion of the rotating shaft.

The present invention has the advantages of greater hot air t amount and better heat dissipation effect.

Claims (9)

Claims

1. A heat ation structure for a motor, wherein an air inlet and an air outlet are formed on the motor; a rotating shaft is arranged in the motor; a fan is fixed at a rear end of the rotating shaft; the fan comprises a number of blades which are arranged ly about an axis of the rotating shaft at 10 uniform intervals and arranged on an outer circumferential side of the rotating shaft; the air outlet is located on an outer circumferential side of the fan; the air inlet is located in front of the air outlet; the motor comprises an enclosure portion on the outer circumferential side of the fan; the air outlet is formed in the enclosure n; and, the distance from an inner ferential wall of 15 the enclosure portion to an outer circumferential edge of the fan gradually increases from one end to the other end of the air outlet in a rotation direction of the rotating shaft, wherein the enclosure portion has a circular inner edge, and the axis of the ure portion is eccentric from the axis of the fan.

2. The heat dissipation structure for a motor according to claim 1, wherein 20 the fan comprises a stop portion which is located on a rear axial side of the ; a circular slot running through the motor from front and rear sides to evade the stop portion is formed on the motor; the stop portion has a circular outer edge, and the stop portion is located in the circular slot; and, there is a gap between an outer circumferential wall of the stop portion and an inner 25 circumferential wall of the circular slot.

3. The heat dissipation structure for a motor according to claim 2, wherein an outer edge of each of the blades is located on an outer circumferential side of the outer circumferential edge of the stop portion.

4. The heat dissipation structure for a motor according to claim 5, wherein 30 a notch is formed at a rear end of the outer edge of each of the blades.

5. The heat ation structure for a motor according to claim 1, wherein a guide block is arranged at a rear end of the motor, an air exhaust groove communicated with the air outlet is formed on the guide block, and the orientation of the air t groove is the same as the rotation direction of the rotating shaft.

6. The heat dissipation structure for a motor according to claim 1, n each of the blades of the fan comprises an inner section and an outer section, an inner end of the outer section is connected to the inner section, and an outer end of the outer section extends toward a side away from the rotation 10 direction of the rotating shaft.

7. The heat dissipation structure for a motor according to claim 6, wherein the outer section is aped, and the arc shape of the outer section is open facing the side away from the rotation direction of the rotating shaft.

8. The heat dissipation structure for a motor according to claim 2, wherein 15 a rear end cover body and a housing are arranged at the rear end of the motor; the g is located on a rear axial side of the rear end cover body; the circular slot is formed on the housing; the enclosure portion is arranged on the rear end cover body or the housing; a number of through grooves, running through the rear end cover body from front and rear sides to allow a gas to 20 pass therethrough, are formed on the rear end cover body; and, a bearing chamber is formed on the rear end cover body, and the rotating shaft is fixed by a g.

9. The heat dissipation structure for a motor according to claim 8, wherein an occlusion n is arranged on an inner circumferential side or an outer 25 circumferential side of the enclosure portion, and the occlusion portion and the ure portion are arranged on the rear end face body and the housing, respectively; and, the housing is fixed on the rear side of the rear end cover body through a buckle structure, the buckle structure comprises a male buckle and a female buckle, the male buckle is arranged on the enclosure portion, 30 and the occlusion n is d on the outer circumferential side of the enclosure portion.