JP2005140036A - Air pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively release the heat of a motor part of an air pump while maintaining the state of positioning and holding of a stator core of the motor part in a housing even during the operation of the air pump. <P>SOLUTION: The housing constituting the motor part of the air pump has a plurality of slotted holes. The stator core is fitted and inserted into the inner peripheral face of the housing while securing an interference and a reinforcing hardware is fitted and inserted into the outer periphery of the housing to encircle the stator core while securing an interference. Thereby, the heat of the motor is released through the slotted holes of the housing directly into the air around the air pump. The degradation of the stator core holding force of the housing due to the slotted holes is compensated with the reinforcing hardware. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cooling / heating device or an air pump for supplying oxygen-enriched air.

  Conventionally, this type of air pump is configured to transmit power to a pump mechanism using an electric motor as a drive source, and when heat generated by a winding portion of the motor is transmitted to the pump mechanism, There has been a problem that the basic performance of the air pump is lowered by heating the air as the working fluid.

  As a means for releasing heat generated by the motor to the surrounding atmosphere to solve this problem, as shown in FIG. 2, the heat radiation area can be increased by increasing the surface area of the parts constituting the motor, such as a housing, or by providing heat radiation fins. There is known a method for ensuring the above (for example, see Patent Document 1).

In addition, there are other methods to dissipate the heat inside the motor to the atmosphere by providing small openings and ventilation spaces in the parts that make up the motor such as the housing, and to effectively dispose the heat conduction member between the heat generating part and the housing. And a method of forcibly cooling the electric motor section with a self-cooling fan is also known as a well-known technique.
JP 2001-178067 A

  However, in each of the conventional configurations, heat generated inside the electric motor part is sequentially transmitted to the constituent members of the electric motor, and finally, the heat is finally radiated from the motor housing part to the atmosphere, or by a self-cooling fan. The heat dissipation effect is accelerated.

  For this reason, the good and bad heat conduction characteristics of the members that make up the motor greatly affect the heat dissipation effect, and the heat generating part is not in direct contact with the atmosphere or has a small area even if in contact with the heat diffusivity. Is inferior.

  In order to solve this, it is better to make a large hole in the housing or make a notch so that the motor heat generating part and the atmosphere around the air pump are in direct contact. In this case, the housing is tightened to hold the stator core of the motor. When the air pump is in operation, the positioning of the stator core is out of order due to the influence of vibration and the like, and ultimately the performance of the air pump is significantly affected.

  In particular, when the housing material is made of an aluminum system, the housing and the stator core expand from the dimensions before the air pump operation due to the heat generated by the electric motor as the air pump operates, but aluminum has a linear expansion coefficient that is higher than that of iron. Since the motor portion is large, the force with which the housing fastens and holds the stator core is lost as the motor temperature rises.

  For this reason, in order to ensure the force with which a housing hold | maintains a stator core, the subject that the thermal radiation performance of the electric motor part was not improved occurred.

  The present invention solves the above-mentioned conventional problems, and provides an air pump characterized in that it can improve the heat dissipation characteristics of heat generated from the electric motor part and at the same time maintain the force with which the housing positions and holds the stator core in the electric motor part. The purpose is to do.

  In order to solve the above-described conventional problems, the air pump of the present invention has a plurality of elongated holes formed in a housing of an electric motor section that drives the air pump, and is fitted and inserted in an inner peripheral portion of the housing with a tightening margin. A cylindrical reinforcing metal fitting is fitted and inserted into the outer periphery of the housing so as to surround the stator core.

  As a result, the heat generated in the motor part is directly diffused into the atmosphere around the air pump through the long hole opened in the housing holding the stator core, so that the heat dissipation effect of the motor part is improved. On the other hand, the holding strength of the stator core of the housing is reduced because the slot is open, but the stator core is positioned with respect to the housing because it is tightened by the reinforcing metal fittings arranged around the stator core. It is held in the state.

  Moreover, in addition to directly diffusing the heat generated by the motor part into the atmosphere, the housing is made of aluminum or copper materials with good thermal conductivity, and the effect of escaping the heat is further improved. The linear expansion coefficient of the aluminum and copper components is greater than that of the ferrous materials that make up the stator core and the reinforcing metal fittings. Since the tightening allowance is ensured at a minimum, the stator core is ensured to be positioned with respect to the housing.

  When the housing is made of a stainless steel material, the heat conductivity is inferior to iron or aluminum, but it is excellent in terms of rust prevention.

  The air pump of the present invention can ensure the positioning and holding of the stator core while effectively releasing the heat of the electric motor unit.

  According to a first aspect of the present invention, in a pump having a pump mechanism that uses air as a working fluid and an electric motor that drives the pump mechanism, the inner peripheral surface of a metal housing case that constitutes the electric motor is fitted and inserted with a tightening margin secured. The motor case has a stator core, and a cylindrical reinforcing bracket fitted with a tight margin on the outer periphery of the housing case. The housing case diffuses heat generated by the motor directly into the atmosphere around the air pump. In the meantime, the reinforcing metal fitting is disposed in the housing case so as to surround the stator core, so that the heat generated in the motor portion from the long hole portion of the housing is effectively in the atmosphere around the air pump. On the other hand, the reinforcing metal fitting is disposed on the outer periphery of the housing so as to surround the stator core. Positioning is held in part.

  In the second invention, in particular, the housing of the first invention is made of a non-ferrous metal having better thermal conductivity than iron, and the stator core and the reinforcing metal fitting are made of an iron-based metal, so that the heat generated in the motor unit is generated by the housing. In addition to the effect of radiating heat from the long hole, heat is radiated from the contact portion between the housing and the stator core more quickly than in the case of iron-based materials.

  In the third invention, in particular, since the housing case of the first or second invention is made of an aluminum-based material, the housing and the stator core are added to the effect that the heat generated in the motor unit is radiated from the long hole of the housing. The heat release from the contact portion is performed more quickly than in the case of an iron-based material. On the other hand, since the linear expansion coefficient of aluminum-based material is larger than that of iron, even when the temperature of the housing, the stator core, and the reinforcing bracket rises due to the heat generated by the motor when the air pump is driven, before the air pump is driven. Since the tightening allowance is ensured at a minimum, a state where the stator core is positioned and fixed with respect to the housing is ensured.

  In the fourth aspect of the invention, in particular, the housing case of the first or second aspect is made of a copper-based material. Therefore, in addition to the effect that the heat generated in the motor unit is radiated from the long hole of the housing, the housing and the stator core The heat release from the contact portion is performed more quickly than in the case of an iron-based material. On the other hand, since the linear expansion coefficient of aluminum-based material is larger than that of iron, even when the temperature of the housing, the stator core, and the reinforcing bracket rises due to the heat generated by the motor when the air pump is driven, before the air pump is driven. Since the tightening allowance is ensured at a minimum, a state where the stator core is positioned and fixed with respect to the housing is ensured.

  In particular, the fifth invention has a rust prevention effect compared to a housing made of iron because the housing case of the first invention is made of a stainless steel material.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a partial cross-sectional view of an air pump according to a first embodiment of the present invention.

  In FIG. 1, a pump mechanism 13 is disposed at one end of a drive shaft 12 of the electric motor unit 11, and a stator core 2 is fitted and inserted into an inner peripheral portion of the housing 1 of the electric motor unit 11 with a tightening margin. Yes. Further, a reinforcing metal fitting 3 is fitted and inserted into the outer periphery of the housing 1 so as to surround the stator core 2, and a plurality of elongated holes 4 are formed in the housing 1.

  About the air pump comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the electric motor unit is operated, the pump mechanism is operated through the drive shaft, and the pump works to satisfy a predetermined performance. However, since the winding of the motor part becomes a heating element, the heat generated from the motor part is radiated directly into the surrounding atmosphere as the motor continues to operate, while all the air pumps constituting the air pump through the housing in contact with the stator core Heat is transmitted to the member. Furthermore, the heat transmitted to each member of the air pump is radiated from each member to the surrounding atmosphere.

  However, since the housing has a plurality of long holes, most of the amount of heat generated by the motor part is first radiated from the long holes directly to the atmosphere around the air pump, and the rest of the members that make up the air pump. Is finally dissipated into the surrounding atmosphere. However, part of the heat is transferred to the pump mechanism and then consumed to raise the temperature of the working fluid air inside the pump mechanism. In this embodiment, the amount of heat is sufficiently reduced in advance. As a result, the basic performance of the pump does not deteriorate.

  On the other hand, since the housing is provided with a plurality of long holes, generally the relationship between the dimension of the inner peripheral part of the housing and the dimension of the outer peripheral part of the stator core can be set so as to allow tightening. During the operation of the air pump, it is difficult to keep the stator core positioned and held only by the holding force of the housing. However, in this embodiment, reinforcing metal fittings are arranged around the stator core on the outer periphery of the housing, and the relationship between the dimensions of the inner peripheral part of the reinforcing metal fittings and the dimensions of the outer peripheral part of the housing is set in advance so that the allowance can be tightened. Therefore, even when the air pump is in operation, the tightening allowance is loosened with the heat generated from the electric motor section, and the positioning of the stator core does not go wrong.

  In addition, when the material constituting the housing is an aluminum-based material or a copper-based material, when the heat generated from the motor part is transmitted to the housing through the stator core, the heat is absorbed from the stator core more quickly than the iron-based material housing. In addition, since the heat is radiated to the atmosphere around the air pump, the influence of the heat generated by the motor section on the pump function can be further reduced.

  Further, when the material constituting the housing is made of a stainless steel material, the heat transfer effect is inferior to that of the iron material, but an antirust effect can be obtained.

  As described above, the air pump according to the present invention efficiently dissipates heat generated by the electric motor unit and has an effect of reliably positioning and holding the stator core of the electric motor unit. Therefore, the air pump is not limited to the air pump and generates heat from the electric motor. It can be applied to various industrial fields that require significant elimination of the effects of

Partial sectional view of the air pump in the first embodiment of the present invention Cross section of conventional air pump

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Stator core 3 Reinforcement metal fitting 4 Long hole 11 Electric motor part 12 Drive shaft 13 Pump mechanism part

Claims (5)

In a pump equipped with a pump mechanism that uses air as a working fluid and an electric motor that drives the pump mechanism, the inner peripheral surface of a metal housing case that constitutes the electric motor is provided with a stator core of the electric motor that is fitted and inserted with a tightening margin secured The outer periphery of the housing case is provided with a cylindrical reinforcing fitting that is fitted and inserted with a tightening margin, and the housing case has a plurality of lengths for directly diffusing heat generated by the electric motor into the atmosphere around the air pump. An air pump characterized in that a hole is provided, while the reinforcing metal fitting is disposed in the housing case so as to surround the stator core. 2. The air pump according to claim 1, wherein the housing case is made of a non-ferrous metal having better thermal conductivity than iron, and the stator core and the reinforcing metal fitting are made of an iron-based metal. The air pump according to claim 1 or 2, wherein the housing case is made of an aluminum-based material. The air pump according to claim 1 or 2, wherein the housing case is made of a copper-based material. The air pump according to claim 1, wherein the housing case is made of a stainless steel material.

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