JP2021023016A - Motor mounting structure, and blower and hot water supply device provided with the same - Google Patents

Abstract

To provide a motor mounting structure which effectively suppresses vibration transmission to a mounting object member from a motor with means having a simple constitution, and can appropriately achieve reduction of vibration and noise.SOLUTION: The motor mounting structure includes a motor 3, and a mounting object member 4 of the motor 3 provided with a plurality of fastening object parts 41 in which a plurality of parts of the motor 3 are fastened to a plate-like part, in which a peripheral region of each of the fastening object parts 41 is provided with at least one hole part 45 that surrounds or sandwiches each of the fastening object parts 41 in the plate-like part of the mounting object member 4, and thereby the peripheral region is composed as a spring part 44 having a support piece part 44a that has lower rigidity than the other general region of the mounting object member 4, supports the peripheral region and is partially elastically deformable.SELECTED DRAWING: Figure 1

Description

The present invention relates to a motor mounting structure capable of suppressing vibration during driving of a motor, a blower equipped with the motor mounting structure, and a hot water supply device provided with the blower.

As an example of a blower device used as a component of a hot water supply device or the like, there are those described in Patent Documents 1 and 2.

The blower device described in Patent Document 1 includes a casing for accommodating an impeller and a motor for rotating the impeller, and the main body of the motor includes anti-vibration rubber on a motor holder provided in the casing. It is held through. For example, vibration may occur in the motor when the motor is driven because the impeller is unbalanced. On the other hand, according to such a configuration, it is possible to make it difficult to transmit the vibration of this motor to the casing due to the action of the anti-vibration rubber. Therefore, the effect of reducing vibration and the noise associated therewith can be obtained.

On the other hand, in the blower device described in Patent Document 2, a convex portion for partially increasing the rigidity is formed in a region on the outer peripheral side of the side plate constituting the casing for accommodating the impeller and the motor mounting location. ing. According to such a configuration, the motor mounting portion inside the convex portion of the side plate has lower rigidity and elasticity than the convex portion. Therefore, it is difficult to transmit the vibration of the motor to other parts of the casing, and it is possible to reduce the vibration of the entire casing and the noise associated therewith.

However, in the above-mentioned prior art, there is room for improvement as described below.

First, in the blower device described in Patent Document 1, it is necessary to provide a large-sized anti-vibration rubber and a motor holder as means for holding the main body of the motor. Therefore, in addition to increasing the overall size, the manufacturing cost is also high. Further, in order to suppress the transmission of vibration from the motor to the casing (transmission of the exciting force from the motor to the casing), the spring coefficient of the anti-vibration rubber is reduced to reduce the natural frequency and the damping of the anti-vibration rubber. It is desirable that the coefficient be as small as possible. On the other hand, with the means using anti-vibration rubber, it is difficult to considerably reduce the damping coefficient when the material is such that the spring constant can be reduced. Therefore, the transmission of vibration from the motor to the casing cannot be effectively reduced, and there is room for improvement in sufficiently reducing vibration and noise.

On the other hand, the blower device described in Patent Document 2 does not use anti-vibration rubber, and as compared with Patent Document 1, it is possible to reduce the overall size and manufacturing cost.
However, in Patent Document 2, since the side plate of the casing is formed with a convex portion for partially increasing the rigidity, the rigidity of the motor mounting portion is relatively low, and elastic deformation is possible. I'm just there. It is difficult to finely set the specific spring coefficient and damping coefficient of the motor mounting location so that the transmission of vibration from the motor to the casing can be effectively suppressed. As a result, in Patent Document 2, as in Patent Document 1, there is room for improvement in sufficiently reducing vibration and noise.

Japanese Unexamined Patent Publication No. 09-303877 Japanese Unexamined Patent Publication No. 2018-100606

The present invention has been conceived under the above-mentioned circumstances, and the vibration transmission from the motor to the member to be mounted is effectively suppressed by means of a simple configuration to reduce vibration and noise. It is an object of the present invention to provide a motor mounting structure that can be appropriately implemented, a blower device provided with this motor mounting structure, and a hot water supply device.

In order to solve the above problems, the following technical measures are taken in the present invention.

The motor mounting structure provided by the first aspect of the present invention has a plurality of fastening objects to which a plurality of parts of the motor are fastened to the motor and at least a part of the plate-shaped portion. A motor mounting structure including a motor mounting target member provided with a portion, and a plate-shaped portion of the mounting target member in a peripheral region of each fastening target portion. By providing at least one hole that surrounds or sandwiches each of the fastening target portions, the peripheral region has lower rigidity than other general regions of the mounting target member and supports the peripheral region. It is characterized in that it is configured as a spring portion having a support piece portion that can be partially elastically deformed.

According to such a configuration, since the peripheral region of each fastening target portion of the mounting target member to be fastened to the motor is a spring portion, it becomes difficult to transmit the vibration of the motor to other regions of the mounting target member. It is possible to appropriately eliminate the fact that the entire member to be mounted vibrates greatly and noise is generated. In addition to this, the following effects can be further obtained.
First, the spring portion is formed in the mounting target member itself by providing a hole in the plate-shaped portion of the mounting target member. Therefore, it is possible to reduce the number of parts, reduce the size of the whole, and reduce the weight as compared with the means using the anti-vibration rubber which is a separate part. It is also possible to reduce the manufacturing cost.
Secondly, the spring coefficient and the damping coefficient of the spring portion can be easily and accurately set to desired values by changing the specifications such as the shape, size, and arrangement of the hole portion and the support piece portion. It is possible. Therefore, the spring coefficient and the damping coefficient of the spring portion can be optimized or close to this, and the vibration transmission from the motor to the member to be mounted can be effectively suppressed. As a result, the vibration and noise reduction effect (vibration isolation performance) can be made excellent.
Thirdly, for example, in the case of a means using anti-vibration rubber, it is difficult to reduce both the spring coefficient and the damping coefficient, as described in the background technology column. On the other hand, according to the present invention, the material of the spring portion can be made of a material harder than the anti-vibration rubber (if the member to be attached is made of metal, the spring portion is also made of metal). is there. Therefore, it is possible to reduce both the spring coefficient and the damping coefficient to improve the effect of reducing vibration and noise.

In the present invention, preferably, the hole portion is provided with a plurality of hole portions, and the spring portion has a plurality of support piece portions located between the plurality of hole portions as the support piece portion. doing.

According to such a configuration, since the spring portion provided in the peripheral region of the fastening target portion of the attachment target member has a plurality of support piece portions, the spring portion of the spring portion is compared with the case where the support piece portion is singular, for example. It is possible to easily secure the mechanical strength of the spring portion while enhancing the elastic deformation function.

In the present invention, preferably, the plurality of holes have a spiral winding shape centered on each fastening target portion and surround the entire circumference of each fastening target portion, and the plurality of supports of the spring portion. One portion has a spiral winding shape corresponding to the plurality of holes.

According to such a configuration, it is possible to form the spring portion without increasing the opening area of each of the plurality of hole portions so much. In addition, it is possible to prevent the spring constants of various parts of the spring portion from being significantly biased, and it is possible to form a spring portion having excellent vibration isolation performance.

In the present invention, preferably, among the mounting target members, each of the fastening target portions protrudes toward the motor side from the peripheral region in the fastening direction with the motor, and the motor and the mounting target member Are separated from each other in places other than these fastening portions.

According to such a configuration, the following effects can be obtained.
That is, if the motor and the member to be attached are in contact with each other at a position other than the fastening portion, it is difficult to elastically deform the spring portion in the fastening direction. As a means for avoiding this, for example, in the fastening portion, a means such as interposing another member such as a spacer between the motor and the member to be mounted can be considered, but according to the above configuration, such a separate member is provided. It is not necessary to use it, and the number of parts can be reduced and the assembly work can be simplified.

The blower provided by the second aspect of the present invention is a blower comprising a casing for accommodating the impeller and a motor attached to the casing and for rotating the impeller. As a means for attaching the motor to the casing, the motor attachment structure provided by the first aspect of the present invention is used.

The hot water supply device provided by the third aspect of the present invention is a hot water supply device including a blower, and the blower includes the blower provided by the second aspect of the present invention. It is characterized by that.

According to the blower and hot water supply devices provided by the second and third aspects of the present invention, the same effects as described for the motor mounting structure provided by the first aspect of the present invention can be obtained.

Other features and advantages of the present invention will become more apparent from the following description of embodiments of the invention with reference to the accompanying drawings.

It is a perspective view which shows an example of the blower device which concerns on this invention. It is a front view of FIG. It is sectional drawing of FIG. It is an exploded sectional view of FIG. (A) is a front view of the motor mounting plate of the blower shown in FIGS. 1 to 4, (b) is an enlarged explanatory view of a main part of (a), and (c) is (a). It is a cross-sectional view of Vc-Vc. It is a schematic explanatory drawing which shows an example of the hot water supply apparatus which concerns on this invention. It is a figure which shows the vibration model of the blower shown in FIG. (A) is an explanatory diagram of the spring coefficient k of the vibration model shown in FIG. 7, and (b) is an explanatory diagram of the damping coefficient c of the vibration model shown in FIG. 7. (A) to (c) are front views of the main part showing another example of the present invention.

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

The blower A shown in FIGS. 1 to 4 is of a centrifugal type, and as well shown in FIGS. 3 and 4, the impeller 1, the casing 2 accommodating the impeller 1 inside, and the impeller 1 A motor 3 having a drive shaft 30 for supporting and rotating the drive 1 is provided.

The impeller 1 has a hub portion 10, a plurality of blades 11, a shroud 12, and a ring portion 13, and these are integrally molded with a resin. The hub portion 10 has a tubular attachment portion 10a that is attached to the drive shaft 30 of the motor 3 using, for example, a nut 30a.

The casing 2 has a peripheral wall portion 20, a front side wall portion 21, a rear side wall portion 22, and a motor mounting plate 4.
The peripheral wall portion 20 surrounds the outer periphery of the impeller 1 and forms a blower port 23 at the upper portion. The front side wall portion 21 has an intake port 24 and an inwardly projecting tubular guide portion 24a formed on the peripheral edge portion of the intake port 24. The rear side wall portion 22 is configured by combining a main rear side wall portion 22a and an auxiliary rear side wall portion 22b that is separate from the main rear side wall portion 22a. More specifically, as shown in FIG. 4, the casing 2 is configured by combining the casing main body portion 2a and the auxiliary rear side wall portion 22b, and the main rear side wall portion 22a of the casing main body portion 2a has a main rear side wall portion 22a. An opening 25 for passing the impeller is formed. The opening 25 is a portion that allows the impeller 1 to pass through when the impeller 1 is housed in the casing 2 during the assembly work of the blower device A. The auxiliary rear side wall portion 22b is attached to the main rear side wall portion 22a by using screws 5b so as to close the opening 25.

As is well shown in FIGS. 5A and 5C, the motor mounting plate 4 has, for example, a hollow disk shape made of metal having a central opening 40, and has a plurality of first and second convex shapes. It is formed in the peripheral regions of the step portions 41 and 42, the first and second screw fixing holes 43a and 43b (motor fastening holes) provided in these portions, and the plurality of first convex step portions 41. A plurality of spring portions 44 are provided.

The central opening 40 is a portion through which a part of the motor 3 is inserted. As shown in FIGS. 3 and 4, the plurality of second convex step portions 42 are portions such as a front view circular shape that partially protrudes toward the rear side wall portion 22 side of the casing 2. The motor mounting plate 4 is mounted on the rear side wall portion 22 by using screws 90 to be inserted into the second screw fixing hole 43b in a state where each of the second convex step portions 42 is in contact with the rear side wall portion 22. ing. The motor mounting plate 4 is in contact with each of the second convex step portions 42 in relation to the rear side wall portion 22, but the other portions are separated from the rear side wall portion 22 by an appropriate dimension L2. doing. As a result, a gap is generated between the spring portion 44 and the rear side wall portion 22, but according to such a configuration, the spring portion 44 can be appropriately elastically deformed toward the rear side wall portion 22 side. ..

The plurality of first convex step portions 41 are portions for fastening to the motor 3, and correspond to an example of the "fastening target portion" in the present invention. Each of the first convex step portions 41 has a projecting direction opposite to that of the second convex step portion 42, and projects toward the motor 3 side (more accurately, the mounting piece portion 32 side of the motor 3 described later). ing. The motor 3 has a configuration in which a plurality of mounting piece portions 32 are continuously provided on the outer periphery of the front surface portion of the motor main body portion 31, and the mounting piece portions 32 are in contact with the first convex step portion 41. By providing the fastening portion C which is screwed and fastened to the first convex step portion 41 by using the screw 91 screwed into the first screw fixing hole 43a, the motor mounting plate 4 can be mounted. It is planned. The motor mounting plate 4 and the front surface portion of the motor main body portion 31 are in contact with each other only at the portions of the plurality of first convex step portions 41, and the other portions are separated by an appropriate dimension L1. This makes it possible to elastically deform the spring portion 44 toward the motor main body portion 31.
Preferably, in the front view of the motor mounting plate 4, the plurality of first and second convex step portions 41 and 42 are arranged at equal angular intervals, respectively. Further, these are provided in a staggered manner so that the second convex step portions 42 are located substantially at the center between the first convex step portions 41.

Each spring portion 44 is configured by providing a plurality of hole portions 45 in the peripheral region of the first convex step portion 41. As is often shown in FIG. 5 (b), the plurality of hole portions 45 (portions surrounded by halftone dot portions) are centered on the first convex step portion 41 and have the first convex portion as a whole. It has a spiral winding shape that surrounds the entire circumference of the stepped portion 41. The inter-regional region of the plurality of spiral-wound holes 45 has a plurality of support piece portions having one end connected to the first convex step portion 41 and the other end connected to other general parts of the motor mounting plate 4. It is 44a (a portion indicated by a width W) and has a spiral winding shape corresponding to a plurality of holes 45. These plurality of support piece portions 44a form the main body of the spring portion 44. The spring portion 44 including the plurality of support piece portions 44a has lower rigidity than other general regions of the motor mounting plate 4 and is partially elastically deformable. The plurality of support piece portions 44a can be elastically deformed in the thickness direction of the motor mounting plate 4 (the fastening direction of the fastening portion C) and also elastically in the circumferential direction of the peripheral region of the first convex step portion 41. Is.

The blower A is used as a component of the hot water supply device WH as shown in FIG. 6, for example.
The hot water supply device WH shown in the figure includes a burner 8 housed in the case 80 and a heat exchanger 9 that heats hot water using the combustion gas generated by the burner 8. Is attached to the case 80 so that combustion air can be supplied to the burner 8.

Next, the operation of the blower A described above will be described.

First, it is rare that the balance of the impeller 1 is completely adjusted, and when the motor 3 is driven, vibration is generated due to the imbalance of the impeller 1. This vibration is transmitted to the casing main body 2a and the case 80 of the water heater WH via the spring 44. The spring portion 44 suppresses the transmission of such vibrations and suppresses the generation of noise.

When the vibration system is modeled, the mode is as shown in FIG. In the figure, the vibration source is a motor 3, and a vibrating force acts from the motor 3 on the casing main body 2a side via a spring portion 44. F _T excitation force F generated from the motor 3 of the casing main body 2a side F transmission force (excitation force is transmitted) in the motor 3 is as the following equation 1.

In the vibration model, the spring constant k and the damping coefficient c of the spring portion 44 are considered as follows.

That is, FIG. 8A shows, for example, mass m = 0.5 [kg], damping coefficient c = 50 [N · s / m], dynamic balance a = 4.0 [g · mm], and further. under conditions were a suitable constant numerical parameters other than, shows the relationship between the rotational speed of the motor 3 when changing the spring coefficient k to various ω and transmission force F _T. As shown in the figure, the smaller the spring constant k, the more the transmission force _FT is suppressed.

FIG. 8 (b) shows the relationship between the constant of the spring coefficient k 70,000 [N · m], the rotational speed ω of the motor 3 in the case of changing the damping coefficient c and the transmission force F _T. Other parameters such as mass m are the same as in the case of FIG. 8A. As shown in FIG. 8B, in the region where the rotation speed ω is high, the smaller the damping coefficient c, the more the transmission force _FT is suppressed.

On the other hand, the spring portion 44 in the present embodiment forms a plurality of hole portions 45 in the peripheral region of the first convex step portion 41 (the portion to be fastened to the motor 3) of the metal motor mounting plate 4. It is composed of. Therefore, the shape of the plurality of holes 45, arranged by changing variously the Size, spring coefficient k, and the damping coefficient c, simple to be a suitable small value to suppress the transmission force F _T And it can be achieved appropriately. As a result, excellent vibration isolation performance can be obtained, and it is possible to further reduce vibration during operation of the blower device A and noise associated therewith.

In the spring portion 44 of the present embodiment, the plurality of support piece portions 44a and the hole portions 45 have a spiral winding shape, and surround the entire circumference of the first convex step portion 41 (the portion to be fastened to the motor 3). .. Therefore, it is possible to configure the spring portion 44 that can sufficiently secure the amplitude without increasing the opening area of each of the plurality of hole portions 45 so much. Further, it is preferable in order to prevent a large bias in the spring constants of the spring portions 44 and to improve the anti-vibration performance.

In addition, according to the present embodiment, it is not necessary to separately use a spring which is a separate member, the number of parts can be reduced, and the manufacturing cost of the blower A can be reduced. It is also possible to increase the durability of the spring portion 44 as compared with anti-vibration rubber or the like.

FIG. 9 shows another embodiment of the present invention. In the figure, elements that are the same as or similar to those of the embodiment are designated by the same reference numerals as those of the embodiment, and duplicate description will be omitted.

The spring portion 44A shown in FIG. 9A is provided with four hole portions 45 in the peripheral region of the first convex step portion 41 (the portion to be fastened to the motor 3), and is located between them. It is configured to include four support piece portions 44a.
The spring portion 44B shown in FIG. 6B is provided with two support piece portions 44a because the two hole portions 45 are provided. The spring portion 44C shown in FIG. 3C is provided with one support piece portion 44a by providing one hole portion 45.

In any of the configurations shown in FIGS. 9 (a) to 9 (c), the support piece portion 44a is elastically deformable, and the spring portion 44 exhibits vibration isolation. As can be understood from these embodiments, in the present invention, the specific number, shape, size, etc. of the hole 45 for forming the spring 44 are not limited, and various aspects may be used. It is possible. The point is that the spring portion is less rigid than the other general regions of the mounting target member because at least one hole that surrounds or sandwiches the fastening target portion is provided in the peripheral region of the fastening target portion. It suffices if it is configured as a portion capable of partial elastic deformation.

The present invention is not limited to the contents of the above-described embodiments. The specific configuration of each part of the motor mounting structure, the blower device, and the hot water supply device according to the present invention can be variously redesigned within the scope intended by the present invention.

In the above-described embodiment, the case where the motor mounting structure according to the present invention is used for the blower has been described, but the present invention is not limited thereto. The motor mounting structure according to the present invention can be widely applied regardless of the specific type of the mounting target member as long as the motor is mounted on the mounting target member.
The member to be mounted on the motor does not necessarily have to be entirely plate-shaped, and at least a part thereof may be plate-shaped. It suffices that a plurality of fastening target portions for fastening the plurality of motor locations are provided in the plate-shaped portion, and spring portions are provided in the peripheral region thereof.
The fastening of the motor and the member to be mounted is not limited to screw fastening, but may be fastening using a screw member other than screws, and fastening of other types such as caulking.

A Blower WH Hot water supply device 1 Impeller 2 Casing 3 Motor 30 Drive shaft (of motor)
4 Motor mounting plate (mounting target member)
41 First convex step portion (fastening target portion)
44, 44A to 44C Spring 44a Support piece 45 Hole 8 Burner 9 Heat exchanger

Claims (6)

With the motor
A member to be mounted on the motor, which is at least partly plate-shaped and is provided with a plurality of fastening target portions to which a plurality of locations of the motor are fastened.
It is a motor mounting structure equipped with
Among the plate-shaped portions of the attachment target member, the peripheral region of each fastening target portion is provided with at least one hole that surrounds or sandwiches each fastening target portion. Is characterized by being configured as a spring portion having a support piece portion that is less rigid than the other general regions of the mounting target member and is partially elastically deformable to support the peripheral region. Motor mounting structure. The motor mounting structure according to claim 1.
A plurality of holes are provided as the holes.
The spring portion has a motor mounting structure as the support piece portion, which has a plurality of support piece portions located between the plurality of holes. The motor mounting structure according to claim 2.
The plurality of holes have a spiral winding shape centered on each fastening target portion and surround the entire circumference of each fastening target portion as a whole.
A motor mounting structure in which the plurality of support pieces of the spring portion have a spiral winding shape corresponding to the plurality of holes. The motor mounting structure according to any one of claims 1 to 3.
Among the members to be attached, each fastening target portion projects toward the motor side from the peripheral region in the fastening direction with the motor.
A motor mounting structure in which the motor and the mounting target member are separated from each other at a portion other than these fastening portions. A casing that houses the impeller and
A motor attached to this casing and for rotating the impeller,
It is a blower equipped with
A blower according to any one of claims 1 to 4, wherein the motor mounting structure according to any one of claims 1 to 4 is used as a means for mounting the motor on the casing. A water heater equipped with a blower
A hot water supply device, characterized in that the blower device according to claim 5 is provided as the blower device.

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