JP5040533B2 - Blower - Google Patents

Description

  The present invention relates to a blower device including a fan driven by a motor, and more particularly to a structure for mounting a fan to a motor.

  For example, there is a bathroom ventilation air conditioner installed in a bathroom as a blower that uses a motor as a drive source and obtains an air volume by rotating a fan.

  In a bathroom ventilation air conditioner equipped with an AC motor as a motor for driving a fan, phase control is performed in order to obtain an air volume corresponding to each operation mode, and the fine vibration of the phase controlled motor is transmitted to the fan. Therefore, abnormal noise may occur.

  Therefore, vibration-proof washers made of elastic material such as rubber are inserted on both sides of the fan inserted into the drive shaft of the motor, and the fan is clamped from both sides in the axial direction with metal washers via vibration-proof washers. A fan mounting structure has been proposed (see, for example, Patent Document 1).

  In the air blower having such a fan mounting structure, the vibration from the motor is absorbed by the vibration proof washer so as not to be transmitted to the fan, so that the generation of abnormal noise can be suppressed.

Japanese Patent Laid-Open No. 4-26298

  However, in the fan mounting structure in the conventional blower, the vibration of the motor is transmitted to the metal washer by the deformation of the anti-vibration washer due to the secular change of rubber and the metal washer contacting the motor drive shaft due to poor assembly. An unusual noise sometimes occurred.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a blower that can prevent the generation of abnormal noise when the fan is driven.

  In order to solve the above-described problems, a blower of the present invention is inserted into a motor having a drive shaft protruding at least one side, a fan attached to the drive shaft of the motor and driven to rotate, and a drive shaft of the motor. And a fastening member that applies an axial force to the buffer member and fixes the fan to the motor drive shaft. The buffer member has a through-hole portion that is opened with a larger diameter than the motor drive shaft. And the elastic body sandwiched between the two washers, and the elastic body has a shape that fits into the through-hole portion of the washer. In addition, it protrudes from the front and back surfaces sandwiched between the washers at a height less than the thickness of the washer, and the inside is connected to the shaft hole to provide an opening for preventing the displacement of the motor shaft. It is characterized by that.

  In the blower of the present invention, the elastic body of the buffer member is crushed in the axial direction, so that the diameter of the shaft hole portion into which the motor drive shaft is inserted is reduced, and the elasticity of the motor drive shaft and the buffer member is reduced. The body is pressed.

  Also, the washer that sandwiches the elastic body of the buffer member is fitted with a protrusion for preventing the displacement of the elastic body in the through-hole portion through which the drive shaft of the motor passes, so that the inner periphery of the through-hole portion of the washer and the drive shaft of the motor An elastic body is inserted between them, and the washer and the drive shaft of the motor are not in direct contact with each other.

  And since the height of the misalignment prevention convex portion is equal to or less than the thickness of the washer, the misalignment prevention convex portion inserted into the through hole portion of the washer does not protrude from the washer, and when tightening the fastening member, The elastic body is pressed through the washer and crushed in the axial direction.

  According to the blower of the present invention, in the buffer member inserted into the drive shaft of the motor with the fan interposed therebetween, the misalignment prevention convex portion protruding from the elastic body that absorbs the vibration of the motor has the washer that sandwiches the elastic body. By inserting the motor drive shaft inside the misalignment prevention convex portion, it is possible to prevent the washer from moving due to aging or poor assembly and coming into contact with the motor drive shaft. .

  Thereby, the vibration of the motor is absorbed by the elastic body of the buffer member and is not transmitted to the fan, and the generation of abnormal noise can be prevented.

  Hereinafter, an embodiment of a blower of the present invention will be described with reference to the drawings.

<Configuration example of the blower of the present embodiment>
FIG. 1 is a cross-sectional view of an essential part showing an example of a blower according to the present embodiment. The blower 1A of the present embodiment is, for example, a bathroom ventilation air conditioner having a 24-hour ventilation function that is installed in a bathroom and is always operated.

  The blower 1A includes a motor 2 attached to a housing (not shown) and the like, and a fan 3 attached to a drive shaft 20 of the motor 2 and driven to rotate.

  In this example, the motor 2 is a single-axis AC motor with a drive shaft 20 protruding in one direction and driven by, for example, an AC power supply. The drive shaft 20 of the motor 2 is formed with a D-cut portion having a D-shaped cross section at the tip side and a screw portion 21. A ring 22 that restricts the position of the fan 3 in the axial direction is attached.

  The fan 3 is a multi-blade impeller, for example, and has a motor shaft hole 30 into which the drive shaft 20 of the motor 2 is inserted.

  The blower 1 </ b> A is inserted into the drive shaft 20 of the motor 2, and is fastened to the two buffer members 4 that sandwich the fan 3 from both sides in the axial direction, and the screw portion 21 of the drive shaft 20. The nut 5 fixed to the drive shaft 20 is provided.

  In the blower 1 </ b> A, components are inserted in the order of the buffer member 4, the fan 3, and the buffer member 4 on the drive shaft 20 of the motor 2, and the fan 3 is sandwiched between the buffer members 4 from both sides in the axial direction. Then, the nut 5 as a fastening member is fastened to the screw portion 21 of the drive shaft 20, whereby an axial force is applied to the two buffer members 4 sandwiching the fan 3, and the fan 3 drives the motor 2. It is fixed to the shaft 20.

  2 and 3 are configuration diagrams showing an example of the buffer member 4 constituting the blower 1A of the present embodiment, and FIG. 2 is a perspective view showing an example of the buffer member of the present embodiment. a) is a sectional view of the rubber washer of the present embodiment constituting the buffer member, and FIG. 3B is a plan view of the rubber washer.

  The buffer member 4 includes two metal washers 40 and a rubber washer 41 sandwiched between the metal washers 40. The metal washer 40 is an example of a washer, and is made of a disk-shaped metal material having a necessary and sufficient rigidity with respect to the force applied by fastening the nut 5 shown in FIG. A circular through hole 40a having a large diameter is formed.

  The rubber washer 41 is an example of an elastic body, and is made of an elastic material such as rubber that is deformed by the force applied when the nut 5 is fastened. The shaft washer 41a into which the drive shaft 20 of the motor 2 is inserted is formed.

  Further, the rubber washer 41 includes a misalignment prevention convex portion 42 having a shape that fits into the through hole portion 40a of the metal washer 40 on the same axis as the shaft hole portion 41a. The misalignment prevention convex portion 42 has a cylindrical shape having an outer diameter that is substantially the same as or slightly larger than the inner diameter of the through hole portion 40 a of the metal washer 40. The protrusion is formed with a height of less than the height.

  Further, the inside of the misregistration preventing convex portion 42 is connected to and opened with the shaft hole portion 41a, and the drive shaft 20 of the motor 2 is inserted therein. Further, the inner diameter H1 of the misregistration preventing convex portion 42 is larger than the inner diameter H2 of the shaft hole portion 41a, and the rubber washer 41 has the inner peripheral surface of the shaft hole portion 41a protruding inward.

  As a result, in the buffer member 4, the metal washer 40 sandwiching the rubber washer 41 fits the misalignment prevention convex portion 42 of the rubber washer 41 into the through hole portion 40 a through which the drive shaft 20 of the motor 2 passes. As described above, the misalignment prevention convex portion 42 made of an elastic material is interposed between the inner periphery of the through hole portion 40a of the metal washer 40 and the drive shaft 20 of the motor 2, so that the misalignment of the metal washer 40 is prevented. Thus, the metal washer 40 and the drive shaft 20 of the motor 2 are not in direct contact.

  Further, since the height of the misregistration preventing convex portion 42 is equal to or less than the thickness of the metal washer 40, the misregistration preventing convex portion 42 inserted into the through hole portion 40a of the metal washer 40 does not protrude from the metal washer 40. .

  As a result, when the two sets of cushioning members 4 are placed above and below the fan 3 and the nut 5 is fastened to the drive shaft 20 of the motor 2, the rubber washer 41 is pressed by the surface of the metal washer 40. In this way, by pressing the rubber washer 41 through the metal washer 40 by the force applied by fastening the nut 5, the rubber washer 41 can be crushed by a predetermined amount in the thickness direction along the axial direction. .

  Here, the inner diameter of the shaft hole portion 41a of the rubber washer 41 depends on the decrease in the inner diameter of the shaft hole portion 41a when the rubber washer 41 is deformed by the force applied by fastening the nut 5. The diameter is smaller than 20.

  That is, in the blower 1 </ b> A, two sets of the buffer members 4 are placed above and below the fan 3, and the nut 5 is fastened to the drive shaft 20. It collapses. And when the rubber washer 41 is crushed in the thickness direction, the inner diameter of the shaft hole portion 41a is reduced.

  Thereby, the buffer member 4 is configured such that the inner peripheral surface of the shaft hole portion 41 a of the rubber washer 41 is pressed against the drive shaft 20 of the motor 2, and vibration generated by the motor 2 is reliably applied to the rubber washer 41 of the buffer member 4. I tell you to absorb vibration.

  Therefore, assuming that the initial inner diameter of the shaft hole portion 41a of the rubber washer 41 is substantially the same as the inner diameter when the rubber washer 41 is crushed in the thickness direction by fastening the nut 5, the inner peripheral surface of the shaft hole portion 41a is the motor 2. It is ensured that it is in pressure contact with the drive shaft 20.

  That is, the two sets of shock absorbing members 4 placed above and below the fan 3 are provided with a rubber washer 41 so that when the nut 5 is fastened to the drive shaft 20 of the motor 2, the shock absorbing effect of the rubber material used this time can be expected. Each dimension is set so as to be crushed by about 1 mm (about 0.7 mm to 1.5 mm) in the thickness direction. A measured value of the inner diameter of the shaft hole 41a when the rubber washer 41 is crushed by a predetermined amount in the thickness direction by fastening the nut 5 is set as the initial inner diameter of the shaft hole 41a.

  In the dimension example, the diameter of the drive shaft 20 of the motor 2 is φA (mm), whereas the inner diameter of the shaft hole portion 41a of the rubber washer 41 is about φ0.8 Amm to φ0.9 A (mm). .

  Here, the rubber washer 41 of the buffer member 4 includes the misalignment prevention convex portion 42, so that the vicinity of the center where the shaft hole portion 41a is formed is thick. For this reason, assuming that the inner diameter of the misalignment preventing convex portion 42 is the same as the inner diameter of the shaft hole portion 41a, a decrease in the inner diameter of the shaft hole portion 41a when the rubber washer 41 is crushed in the thickness direction by fastening the nut 5. Is not enough.

  Therefore, by setting the inner diameter H1 of the misregistration preventing convex portion 42 to be larger than the inner diameter H2 of the shaft hole portion 41a, the rubber washer 41 is easily deformed in the vicinity of the shaft hole portion 41a by the force applied by fastening the nut 5. In this way, the rubber washer 41 is reliably brought into pressure contact with the drive shaft 20 of the motor 2 regardless of the secular change of rubber.

  Since the buffer member 4 is a component composed of two metal washers 40 and one rubber washer 41, the metal washer 40 is prevented from being displaced and the buffer member 4 is inserted into the drive shaft 20 of the motor 2. In order to facilitate assembly, the rubber washer 41 is provided with a fixing structure for the metal washer 40.

  In other words, the buffer member 4 includes a misalignment prevention cover 43 in which a groove 43 a into which the outer periphery of the metal washer 40 fits is formed on the outer peripheral portions of the front and back surfaces of the rubber washer 41. The misalignment prevention cover 43 protrudes in the thickness direction from the front and back surfaces of the rubber washer 41, and a groove 43a is formed on the inner peripheral surface and opens inward.

  As a result, when the rubber washer 41 is sandwiched between the metal washers 40, the misalignment prevention convex portion 42 of the rubber washer 41 fits into the through hole 40 a of the metal washer 40, and the outer periphery of the metal washer 40 is the outer periphery of the rubber washer 41. It fits into the groove 43 a of the position shift prevention cover 43.

  Therefore, the buffer member 4 is configured in which the rubber washer 41 is sandwiched between the two metal washers 40 so that the position of the metal washer 40 relative to the rubber washer 41 is not shifted.

  As described above, since the cushioning member 4 is composed of three parts integrally, it is possible to easily perform the work of putting it in the drive shaft 20 of the motor 2 and to prevent forgetting to attach the parts. Can be reduced.

  Further, since the metal washer can be fixed to the rubber washer without using an adhesive or an adhesive tape, the number of parts can be reduced, and the assembling work of the buffer member 4 can be performed easily and reliably.

  In the past, the metal washer was affixed to the rubber washer with double-sided tape, so the thickness of the rubber washer was determined in consideration of the thickness of the double-sided tape. The cushioning effect is enhanced by increasing the thickness of the double sided tape and the rubber washer.

  Here, since the misalignment prevention cover 43 protrudes in the thickness direction of the rubber washer 41, the diameter is set so as not to contact the nut 5 and the ring 22 and the fan 3.

<Configuration example of bathroom ventilation air conditioner to which the present invention is applied>
FIG. 4 is a sectional view showing an example of a bathroom ventilation air conditioner to which the present invention is applied. FIG. 5 is a block diagram showing an installation example of the bathroom ventilation air conditioner. Next, the bathroom ventilation air conditioner to which the present invention is applied. The overall configuration and operation example of the apparatus will be described.

  The bathroom ventilation air conditioner 10 </ b> A is an example of an air blower, and includes a main body case 11 with a fan unit 12 and a heater 13.

  The fan unit 12 includes a motor 2, a multi-blade fan 3 attached to the drive shaft 20 of the motor 2 via the buffer member 4 described above, and a fan case 12a that forms an air passage.

  The fan unit 12 has the fan 3 arranged vertically, and the fan case 12a has a lower surface along the axial direction of the fan 3 that opens to form a suction port 12b. In addition, the fan unit 12 has an exhaust port 14 formed on one side in the circumferential direction of the fan 3 and an air outlet 15 formed on the lower surface. Furthermore, the fan unit 12 includes an air path switching damper 16 that switches an air path from the suction port 12b to the exhaust port 14 and an air path to the air outlet 15.

  The air path switching damper 16 receives a driving force of a damper motor (not shown) via a cam 16 a and rotates around a shaft 16 b to perform an opening / closing operation. Depending on the position of the air path switching damper 16, the air path switching damper 16 is connected to the exhaust port from the suction port 12 b. An air passage to 14 and an air passage to the air outlet 15 are formed.

  FIG. 4A shows a state in which the air path switching damper 16 is fully opened. When the air path switching damper 16 is fully opened, the air path to the air outlet 15 is blocked, and a ventilation air path 14a from the suction port 12b to the exhaust port 14 is formed. For this reason, the position where the air path switching damper 16 is fully opened is referred to as the ventilation position of the air path switching damper 16.

  FIG. 4B shows a state in which the air path switching damper 16 is fully closed. When the air path switching damper 16 is fully closed, the air path to the exhaust port 14 is blocked, and a circulation air path 15a from the suction port 12b to the blowout port 15 is formed. For this reason, the position where the air path switching damper 16 is fully closed is referred to as the circulation position of the air path switching damper 16.

  FIG. 4C shows a state in which the air path switching damper 16 is at an intermediate position between the circulation position and the ventilation position. When the air path switching damper 16 is set at an intermediate position between the circulation position and the ventilation position, both a circulation air path 15a from the suction port 12b to the blower outlet 15 and a ventilation air path 14a from the suction port 12b to the exhaust port 14 are formed. The This intermediate position is referred to as a diversion position.

  As the heater 13, for example, an electric heater such as a PTC heater is attached to the air outlet 15. Moreover, the blower outlet 15 includes a plurality of rectifying plates and a motor that changes the direction of the rectifying plates, and includes an electric louver 17 that can switch the wind direction.

  Here, 10 A of bathroom ventilation air conditioners are equipped with the temperature sensor which is not illustrated in the suction inlet 12b, and can detect the temperature of the inhaled air. The fan unit 12 may be provided with an ion generator that generates both positive ions and negative ions.

  A front panel 18 is attached to the lower surface of the bathroom ventilation air conditioner 10A. The front panel 18 is provided with a suction grille 18 a that faces the suction port 12 b of the fan unit 12 and exposes the blowout port 15. The front panel 18 has a filter (not shown) exchangeably attached to the inside of the suction grill 18a.

  Further, the bathroom ventilation air conditioner 10 </ b> A includes an exhaust duct joint 19 at the exhaust port 14.

  As shown in FIG. 5, the bathroom ventilation air conditioner 10A is installed on the ceiling of the bathroom 101, and an exhaust grille 19a attached to an outer wall of a building (not shown) and an exhaust duct joint 19 shown in FIG. Connected.

  The bathroom 101 is partitioned by an openable / closable door 103 between the adjacent washroom 102 and the bathroom 103 absorbs the air in the other room through the washroom 102 by the louver 103 a provided on the door 103. It has come to include.

  10 A of bathroom ventilation air conditioners are operated by the operation part 104 installed in the washroom 102, the motor 2 is driven according to an operation mode, and the fan 3 rotates. When the fan 3 is driven to rotate, the air BA in the bathroom 101 is sucked from the suction port 12b of the fan unit 12 through the suction grill 18a of the front panel 18.

  If the position of the air path switching damper 16 is the ventilation position shown in FIG. 4A, a ventilation air path 14a from the suction port 12b to the exhaust port 14 is formed in the fan unit 12, so that the suction grille of the front panel 18 is formed. The air sucked from the suction port 12b through 18a passes through the ventilation air passage 14a and the exhaust port 14, and is further exhausted from the exhaust grill 19a to the outside through the exhaust duct 19b.

  Accordingly, in the ventilation operation mode, the motor 2 is rotationally driven with the air path switching damper 16 as the ventilation position, and steam and moisture in the bathroom 101 are exhausted. Moreover, when the air in the bathroom 101 is exhausted to the outdoors, the air RA in the bathroom undressing place 102 is sucked into the bathroom 101 through the louver 103a, so that the air in the other room passes through the louver 103a from the bathroom undressing place 102. It is sucked into the bathroom 101 and exhausted outdoors.

  Therefore, when the ventilation operation mode is executed by the bathroom ventilation air conditioner 10A, ventilation of the building (not shown) is performed, and the motor 2 is always driven so as to obtain a predetermined air volume, thereby ventilating the building for 24 hours.

  As described above, in the bathroom ventilation air conditioner 10A, the motor 2 is constantly driven, the amount of wear due to the deformation of the rubber washer that is a buffer member increases, and the vibration of the motor 2 is transmitted to the fan 3 to generate abnormal noise. When the environment is quiet at night, etc., noise may be felt.

  For this reason, as described above, by fixing the fan 3 to the motor 2 via the buffer member 4 of the present invention, the rubber washer 41 shown in FIG. By doing so, the generation of abnormal noise can be prevented.

  Further, the metal washer 40 sandwiching the rubber washer 41 does not come into contact with the drive shaft 20 of the motor 2 due to deformation of the rubber washer 41 due to temperature or secular change, poor assembly, etc., and vibration of the motor 2 is applied to the metal washer 40. It is possible to prevent abnormal noise from being transmitted.

  When the position of the air path switching damper 16 is the circulation position shown in FIG. 4B, a circulation air path 15a from the suction port 12b to the blowout port 15 is formed in the fan unit 12, so that the air is sucked from the suction port 12b. The air BA passes through the circulation air passage 15a and is blown into the bathroom 101 from the blowout port 15 through the blowout grill 18b of the front panel 18.

  Since the heater 13 is disposed at the air outlet 15, when the heater 13 is energized, the air passing through the circulation air passage 15 a is warmed and the hot air blows out from the air outlet grill 18 b.

  As a result, in the heating operation mode, the motor 2 is driven with the air path switching damper 16 as the circulation position, and the heater 13 is energized, and hot air blows out into the bathroom 101 while circulating the air in the bathroom 101. Is done.

  In the ion mode, the heater 13 is not energized, generates approximately the same number of positive ions and negative ions in conjunction with the drive of the motor 2, and blows air containing approximately the same number of positive ions and negative ions. By removing both the floating bacteria contained in the circulating air and the floating bacteria in the air of the bathroom 101, generation of mold and the like can be suppressed.

  If the position of the air path switching damper 16 is the diversion position shown in FIG. 4C, the ventilation air path 15a from the inlet 12b to the outlet 15 and the ventilation from the inlet 12b to the outlet 14 in the fan unit 12. Since both the air passages 14a are formed, a part of the air sucked from the suction port 12b passes through the circulation air passage 15a and is blown out into the bathroom 101 from the blowout port 15 through the blowout grill 18b of the front panel 18. The

  Further, the remaining portion of the air sucked from the suction port 12b passes through the ventilation air passage 14a and the exhaust port 14, and is further exhausted from the exhaust grill 19a to the outside through the exhaust duct 19b.

  Thereby, in the dry operation mode or the like, when the motor 2 is driven with the air path switching damper 16 as the branch position, when the heater 13 is not driven, the air in the bathroom 101 is circulated while the air in the bathroom 101 is circulated. Steam and moisture are exhausted.

  Further, when the heater 13 is energized, the steam and moisture in the bathroom 101 are exhausted while circulating the air in the bathroom 101 and blowing hot air into the bathroom 101.

  In addition, as a bathroom ventilation air conditioner, the structure etc. which were provided with the circulation fan and the ventilation fan, and the circulation air path and the ventilation air path became independent may be sufficient. Further, as the blower, another blower such as a 24-hour ventilator provided with a heat exchange element or an air supply blower for supplying outside air into the room may be used.

  The present invention is applied to a ventilation device having a 24-hour ventilation function that is always operated.

It is principal part sectional drawing which shows an example of the air blower of this Embodiment. It is a perspective view which shows an example of the buffer member of this Embodiment. It is a block diagram which shows an example of the rubber washer of this Embodiment. It is sectional drawing which shows an example of the bathroom ventilation air conditioner to which this invention is applied. It is a block diagram which shows the example of installation of a bathroom ventilation air conditioner.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1A ... Blower, 2 ... Motor, 20 ... Drive shaft, 21 ... Screw part, 22 ... Ring, 3 ... Fan, 30 ... Motor shaft hole, 4 ... Buffer member, 40 ... metal washer, 40a ... through hole, 41 ... rubber washer, 41a ... shaft hole, 42 ... misalignment prevention convex part, 43 ... misalignment Prevention cover, 43a ... groove, 5 ... nut

Claims (4)

A motor having a drive shaft protruding in at least one side;
A fan attached to the drive shaft of the motor and driven to rotate;
A buffer member inserted into the drive shaft of the motor;
A fastening member that applies an axial force to the buffer member and fixes the fan to the drive shaft of the motor;
The buffer member is
Two washers having a through-hole portion opened with a larger diameter than the drive shaft of the motor;
A shaft hole portion into which the drive shaft of the motor is inserted, and an elastic body sandwiched between the two washers.
The elastic body has a shape that fits into the through hole portion of the washer, protrudes from both front and back surfaces sandwiched by the washer at a height equal to or less than the thickness of the washer, and the inside is connected to the shaft hole portion. The air blower is characterized in that it is provided with a misalignment prevention convex portion into which the drive shaft of the motor is inserted. The blower according to claim 1, wherein the buffer member has an inner diameter of the misalignment prevention convex portion larger than an inner diameter of the shaft hole portion of the elastic body. The buffer member has an inner diameter of the shaft hole portion of the elastic body smaller than an outer diameter of the drive shaft of the motor, and a diameter with which the elastic body is pressed against the drive shaft inserted into the shaft hole portion. The blower according to claim 2, characterized in that: The said buffer member was equipped with the position shift prevention cover in which the groove part which the outer periphery of the said washer fits was formed in the outer periphery of the said elastic body which is not in contact with the said fastening member and the said fan. Or the air blower of 3.

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