JP4976161B2 - Ventilation equipment - Google Patents

Description

  The present invention relates to a motor that drives an impeller such as a blower and a ventilation device that ventilates a room.

  Some ventilators ventilate the interior of a room by installing them in an opening made up of pipes, ducts, and the like that communicate the interior and the exterior. Of these, those used around water such as a bathroom generally need to be grounded, and grounding is required for installation (see Patent Document 1). Some ventilators do not need to be grounded. This type of ventilator uses an externally rotating motor as the motor that rotates the impeller. The outer rotation type motor has a winding part inside the motor, which is molded with resin and can easily adopt a double insulation structure, so it can be used for ventilation in the bathroom etc. without grounding Yes (see Patent Document 2).

JP 2000-344411 A JP 2001-336795 A

  The motor of the ventilation device shown in Patent Document 1 is an internal rotation type, and it is difficult to adopt a double insulation structure, and it is necessary to provide grounding for a device for ventilation such as a bathroom. Although it is difficult to reduce the size of an outer rotating motor that can use a double insulation structure, an extremely small motor with an outer diameter of about φ45 has been developed for the inner rotating type, and the air passage area can be widened. Dust adhering to the inside can also be reduced.

  The present invention is to make it possible to use the inner rotary motor, which has been miniaturized as described above, around the water without using a ground by providing a double insulation structure. It is to obtain a ventilator that does not require grounding work so as to drive the impeller, and to improve various functions of the ventilator, such as reduction of dust adhesion.

In order to solve the above-described problems, the present invention has a cylindrical body portion that is attached to an opening constituted by a pipe, a duct, or the like that communicates indoors and outdoors, and a blower in which a propeller-type impeller rotates in the body portion. The blower motor is an inner rotation type motor having a steel plate outer shell, and is covered with a cover made of an insulating resin, including a flange portion for connecting the outer bracket and frame. The rotary shaft portion extending from the frame to the outside of the outer shell is also covered with a shaft cover made of an insulating resin, and the cover is provided with a shaft insertion portion through which the rotation shaft is inserted. The cylindrical projecting portion that covers the bearing portion is configured such that the inner diameter portion of the boss portion of the impeller and the shaft insertion portion wrap in the axial direction with a predetermined gap.

  According to the present invention, the outer shell made of a steel plate adjacent to the winding portion positioned outside the motor is covered with the insulating resin cover including the flange portion, and further, the rotary shaft portion extending outside the outer shell is also applied. Since it is covered with a shaft cover made of an insulating resin, it becomes an internal rotary motor with a solid double insulation structure. Since the impeller is mounted on the rotating shaft covered with the shaft cover made of insulating resin and the ventilation device is configured by a blower that drives the impeller, there is no need to provide grounding even if it is used around water.

  The ventilator according to the present invention is to be mounted by inserting a main body from the indoor side into an opening constituted by a pipe, a duct, or the like that communicates indoors and outdoors. The main body has a configuration including a cylindrical body and an axial flow type fan in which a propeller-type impeller rotates in the body and forms a ventilation flow from the indoor side toward the outdoor side. The motor of the blower is an inner rotation type motor having a steel plate outer shell, including a flange portion for connecting the outer bracket and the frame, and a thickness of 1 mm or more made of an insulating resin (sufficient to maintain insulation). The thickness of the rotating shaft that is covered with a cover that is thick and does not increase its dimensions so that it does not increase too much, and that extends from the frame to the outside of the outer shell is 1 mm or more in thickness (this also The cover is covered with a shaft cover that is thick enough to maintain insulation, but not so thick.

  In the motor of the blower of the present invention, the outer shell made of a steel plate adjacent to the winding portion located outside the motor is covered with a cover having a thickness of 1 mm or more of insulating resin including the flange portion, and further outside the outer shell. This is an internal rotary motor with a solid double insulation structure in which the rotating shaft portion that extends is covered with a shaft cover of insulating resin having a thickness of 1 mm or more. Therefore, it is excellent in insulation without being grounded, and can be used around water. Since the ventilation device is configured by mounting the impeller on the rotating shaft covered with the shaft cover of insulating resin, it is not necessary to provide grounding even if the ventilation device is used around water. Even if the impeller is removed for maintenance, the conductive rotating shaft portion extending outside the outer shell of the motor is safe because it is not exposed by the shaft cover.

Embodiment 1 FIG.
1 is a cross-sectional view showing the ventilator of the present embodiment in an attached state, FIG. 2 is an exploded cross-sectional view of the ventilator in the same attached state, and FIG. 3 is a rear view of the ventilator with the bracket cover removed. 4 is a rear perspective view of the ventilator with the bracket cover attached, FIG. 5 is a cross-sectional view showing another form of the ventilator mounted, and FIG. 6 is another form of the ventilator. A rear perspective view of the ventilator, FIG. 7 is an explanatory diagram comparing the ventilation performance of the ventilator of the present embodiment and other ventilators.

  The ventilator according to the present embodiment relates to a ventilator that is inserted and installed from the indoor side into an opening 2 constituted by a pipe 1 or a duct that communicates indoors and outdoors. In this ventilator, an axial flow blower composed of a propeller impeller 5 and a motor 6 is assembled to a resin frame 4 having a cylindrical body 3 constituting a wind tunnel inserted into a pipe 1 or the like. The main body 7 and a lattice grill 8 provided on the front surface. In the frame 4, a front structure is integrally formed at the mouth edge portion of the bell mouth-shaped opening 9 that serves as a suction port at the front portion of the body portion 3. The front structure has a substantially square (or round) flange portion 10 that protrudes in the radial direction, and a rising portion that is formed at the end edge of the flange portion 10 and protrudes toward the back side where the end surface comes into contact with the wall surface on the indoor side. (See FIG. 1).

  The motor 6 of the blower is an internal rotation type motor having a steel plate outer shell. The outer shell of the motor 6 has a configuration in which the frame 11 and the bracket 12 are coupled at the flange portion 13. The motor 6 is screwed to the motor cover 14 provided on the indoor side of the body portion 3 of the frame 4 at the outer flange portion 13. Installed by. The flange portion 13 has a minimum dimension necessary for sealing the joint portion of the frame 11 and the bracket 12 so as not to hinder the blowing of the blower, and the outer diameter thereof is about φ48. A starting condenser and a motor lead 16 are provided outside the bracket 12, and these are covered with a condenser cover 17 that is fastened together with screws 15 together with the bracket 12. A part of the capacitor cover 17 is provided with a lead outlet that protrudes in the outer peripheral direction. From this part, the motor lead 16 is protected from the bracket side to the frame side with its outer portion protected by a lead tube, that is, in the motor axial direction. It is located towards. The outer diameter of the motor 6 is about φ44 except for the screw hole portion for fixing the motor 6 and is very small.

  A rotating shaft portion 18 extending from the frame 11 of the motor 6 to the outside of the outer shell is provided with a shaft cover 19 made of an insulating resin and having a thickness of 1 mm or more (thickness sufficient to maintain insulation, but not so large). It is covered with. The shaft cover 19 is cut in advance so that the shaft diameter of the rotating shaft portion 18 extending outside the outer shell is 1 mm or more in a radial dimension and is not so thin, and is fixed to the cut rotating shaft portion 18 by press-fitting. . The shaft diameter of the motor 6 including the shaft cover 19 is about φ5. The base portion of the shaft cover 19 is configured as a large-diameter portion 20 that encloses the rotating shaft portion 18 that is not cut, and a flange 21 that protrudes in the radial direction is formed at the edge of the shaft cover 19.

  The reason why the shaft diameter is cut by 1 mm or more in radial dimension is to match the outer diameter including the shaft cover 19 with the boss portion 22 of the ready-made impeller 5 so that the ready-made impeller 5 can be used as it is. However, if the impeller 5 is aligned with the rotating shaft portion 18 of the motor 6, the shaft cover 19 may be attached without cutting as shown in FIG. In any case, the shaft cover 19 is not limited to the occupancy coupling by the press-fitting portion. For example, even if an adhesive is applied to the outer periphery of the shaft tip of the motor 6 and press-fitted, the remaining adhesive remains in the large-diameter portion. 20 and is not adhered to the bearing portion.

  The motor cover 14 covers the frame side of the outer shell made of steel plate of the motor 6, and has three legs 23 and each leg that extend rearward along the center line direction of the body 3 at intervals in the circumferential direction. 23 is an open container shape with an open circular round bottom on the side opposite to the body portion, supported by the center of the body portion 3 by legs 24 extending radially inward from the end portion, and is integrally formed with the body portion 3 by insulating resin. . The three legs 23 are all on the inner side of the outer periphery of the body part 3, and on the outer side of two of them, the main body 7 is held in the pipe 1 or the duct by the expanding elastic force in the radial direction. A warped leaf spring 25 is mounted (see FIGS. 3 and 4).

  A shaft insertion portion 26 is provided at the center of the bottom of the open container-like portion of the motor cover 14 so that the rotation shaft of the motor 6 is inserted into the body 3 side. The shaft insertion portion 26 and the open container-like portion are 1 mm or more. It is thick. The outer diameter of the open container-like portion of the motor cover 14 is configured to be equal to or slightly larger than the outer diameter of the flange portion 13 of the outer shell of the motor 6. The shaft insertion portion 26 is a cylindrical projecting portion that covers the bearing portion of the frame 4, and the inner diameter portion of the boss portion 22 of the impeller 5 is wrapped with a gap of about 1 mm (see FIG. 1A portion). Further, a clearance of about 1 mm (see FIG. 1B) is also provided between the outer periphery of the flange 21 formed on the edge of the large diameter portion 20 of the shaft cover 19 and the shaft insertion portion 26, and the impeller 5 rotates. By doing so, these portions have a fluid bearing structure (labyrinth structure), and dust and moisture are prevented from entering the bearing portion of the motor 6 in a double manner. Note that the attachment of the shaft cover 19 prevents condensation that occurs in the boss portion 22 of the impeller 5. Three screw fitting structures projecting in the radial direction are formed on the open end side of the motor cover 14 at intervals of about 120 degrees in the circumferential direction, and the motor 6 is fixed to the screw fitting structure with screws 15. Yes. In addition, the corner | angular part by the side of the room | chamber interior which is the windward side of the ventilation direction of the leg part 23 is taken in the shape with little air resistance.

  The impeller 5 fitted and attached to the rotary shaft portion 18 of the motor 6 in a form contained in the body portion 3 is provided with a three-part shaft hole portion provided with a tightening spring 27 on the outer periphery during maintenance. Can be removed from the rotary shaft portion 18 by being pulled out, and can be press-fitted by being pushed in. Even when the impeller 5 is removed, the metal portion of the rotating shaft portion 18 of the motor is not exposed by the shaft cover 19.

  The bracket side of the motor 6 is also covered with a bracket cover 28 made of an insulating resin and having a thickness of 1 mm or more (thickness sufficient to maintain insulation and not so large). The bracket cover 28 covers the bracket 12 from the outside of the condenser cover 17 together with the screw 15 fixing the motor 6, and is externally fitted by wrapping about 3 mm on the open end side of the motor cover 14. The bracket cover 28 is formed with a lead holding portion 30 that sandwiches the motor lead 16 that has come out from the lead outlet of the capacitor cover 17 together with the protective tube at the middle of the lead outlet portion 29 formed in the motor cover 14. . Thereby, the sealing degree of the lead exit part of the motor lead 16 is improved. Since the inner diameter of the bracket cover 28 is φ48 and the thickness is about 1.5 mm, the outer diameter of the maximum portion of the actual motor 6 is φ51.

  When the entire motor 6 is covered with the motor cover 14, the bracket cover 28, and the shaft cover 19 in this way, there is a concern that the temperature of the motor 6 rises, moisture is stagnated inside, and the life of the bearing is shortened. Such a problem can be solved by providing a ventilation structure 31 in either the motor cover 14 or the bracket cover 28 as shown in FIG. As the ventilation structure 31, for example, a plurality of slits having a width dimension of 1 mm or less are provided. The distance between the slit portion and the outer portion of the motor 6 is 2 mm or more. As a result, heat and moisture are released to the outside from the slit without impairing the insulating properties. The thickness of the motor cover 14 and the bracket cover 28 may be 1 mm or more. However, if there is a gap, the thickness may be 1 mm or less. If the extended surface distance of the outer portion of the motor 6 is 2 mm or more, there is a risk of human touching. Absent. And this motor 6 can also turn the impeller of a centrifugal blower.

FIG. 7 shows a comparison of the air blowing performance of a motor without a double insulation structure and a motor 6 of the present embodiment. Since the inner diameter of the body 3 is φ90 and the outer diameter of the motor cover 14 is φ48, the air passage area when the three legs 23 are not taken into consideration is 45.5 cm ² , and the bracket cover 28 Since the outer diameter of each is φ51, the air passage area when the three legs 23 are not taken into consideration is 43.2 cm ² . In the case of this type of ventilator so far, the outer diameter of the largest portion of the motor 6 is φ68, so the air passage area is 27.3 cm ² . When the bracket cover 28 is provided, the air passage area is reduced by 5% as compared with the case without the bracket cover 28, and is reduced by 40% in the case of this type of ventilator. By providing a roundness at the end surface portion of the bracket cover 28 that is coupled to the motor cover 14, the difference in the blowing performance can be almost eliminated, and the deterioration of the blowing performance due to the provision of the bracket cover 28 can be minimized. In addition, the figure regarding this ventilation performance evaluates with the rotation speed 2500 / min constant.

  The inner-rotary motor, in which the steel plate outer shell of the motor 6 is covered with an insulating resin cover and the rotating shaft extending from the outer shell is also covered with an insulating resin cover, drives various devices used around water in addition to the ventilation device. Can be widely used as a machine.

It is sectional drawing which shows a ventilation apparatus in an attachment state. (Embodiment 1) It is an exploded sectional view of the ventilation device of an attachment state. (Embodiment 1) It is a back side perspective view of the ventilation apparatus of the state which removed the bracket cover. (Embodiment 1) It is a back side perspective view of a ventilator in the state where a bracket cover was attached. (Embodiment 1) It is sectional drawing of the ventilation apparatus of another form. (Embodiment 1) It is a back side perspective view of the ventilator of other forms. (Embodiment 1) It is explanatory drawing which compares and shows the ventilation performance of the ventilation apparatus of embodiment and another ventilation apparatus. (Embodiment 1)

Explanation of symbols

  2 opening, 3 body part, 5 impeller, 6 motor, 7 body, 11 frame, 12 bracket, 13 flange part, 14 motor cover, 16 motor lead, 18 rotating shaft part, 19 shaft cover, 26 shaft insertion part, 28 Bracket cover, 29 lead outlet part, 30 lead holding part, 31 ventilation structure.

Claims (5)

A cylindrical barrel for instrumentation wear opening constituted by indoor and outdoor pipe or duct or the like for communicating the, a ventilator propeller type impeller is example Bei blower which rotates in the barrel, the The blower motor is an inner-rotation type motor having a steel-made outer shell, which is covered with a cover made of an insulating resin, including a flange portion for connecting the outer bracket and the frame, and extends from the frame to the outside of the outer shell. The rotating shaft portion to be taken out is also covered with a shaft cover made of an insulating resin , and the cover is provided with a shaft insertion portion through which the rotation shaft is inserted, and the shaft insertion portion is a cylindrical protruding portion that covers the bearing portion of the frame. The ventilator is characterized in that the inner diameter portion of the boss portion of the impeller and the shaft insertion portion wrap in the axial direction with a predetermined gap . The ventilator according to claim 1 , wherein the shaft diameter of the rotating shaft portion that protrudes outside the outer shell of the motor is reduced by 1 mm or more in advance in the radial dimension, and has a wall thickness corresponding to the reduced outer diameter on the rotating shaft portion. Ventilator with a shaft cover. The ventilator according to claim 1 or 2 , wherein a clearance between the shaft cover of the motor and the shaft insertion portion of the cover covering the outer frame is 1 mm or less. A ventilating device according to any one of up to claims 1 to 3, ventilator and held with clamping motor leads of the motor, the read outlet portion and the lead holding portion provided on the cover. A ventilating device according to any one of up to claims 1 to 4, the ventilation device provided with a vent structure in the cover of the motor.

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