JP2015117690A - Protective cover and compressor using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noises generated by resonance of a protective cover.SOLUTION: A protective cover for a compressor, which is attached to a protective barrier for surrounding the periphery of a connection terminal provided in a casing of a compressor, comprises at least one protrusion that is provided in the state of facing an opening end of the protective barrier and that is brought into contact with the opening end in a natural vibration mode in which the protective cover for the compressor emits a sound.

Description

  The present invention relates to a protective cover for a compressor that is attached to a protective wall that surrounds a periphery of a connection terminal provided on a casing of the compressor.

  The casing of the compressor is provided with a terminal having a plurality of connection terminals, and this terminal is protected by a protective cover as shown in Patent Document 1, for example.

  Specifically, this protective cover is attached so as to cover a protective wall provided so as to surround the periphery of the terminal in the casing of the compressor. For example, a protective wall made of metal such as stainless steel is used.

JP-A-4-334944

  By the way, the protective cover has a problem that vibration (excitation force) is transmitted from the protective wall in accordance with the operation of the compressor, and vibration (resonance) occurs in a natural vibration mode to generate noise. This problem is particularly noticeable because the speed of the compressor is increasing with the recent energy saving of air conditioners.

  Accordingly, the present invention has been made to solve the above-described problems, and has as its main object to reduce noise caused by resonance of a compressor protective cover.

  That is, the protective cover for a compressor according to the present invention is a protective cover for a compressor that is attached to a protective wall that surrounds the periphery of a connection terminal provided on the casing of the compressor, and is opposed to the opening end of the protective wall. And having at least one or more protrusions that come into contact with the opening end in the natural vibration mode generated by the compressor protective cover.

In such a case, in the natural vibration mode generated by the protective cover, the protective cover is provided with a convex portion that comes into contact with the opening end of the protective wall. Even if it does, a natural vibration mode (resonance) can be attenuated because a convex part contacts an opening edge part, and noise can be reduced.
Moreover, the amplitude in the natural vibration mode of the protective cover can be reduced by the convex portion, and the excitation force received from the protective wall can be weakened. Also by this, the natural vibration mode (resonance) can be attenuated, and noise can be reduced.

  The compressor protective cover according to the present invention is a compressor protective cover that is attached to a protective wall that surrounds a connection terminal provided on a casing of the compressor, and includes a front end surface and a side surface of the protective wall. It has at least 1 or more convex part provided so that it may oppose, It is characterized by the above-mentioned.

In such a case, since the convex portion is provided so as to face the tip surface and the side surface of the protective wall, even if the protective cover resonates (resonates) due to the excitation force received from the protective wall, the convex portion is By contacting the tip surface or the side surface of the protective wall, resonance (resonance) can be attenuated, and noise can be reduced.
Moreover, the amplitude in the natural vibration mode of the protective cover can be reduced by the convex portion, and the excitation force received from the protective wall can be weakened. Also by this, the natural vibration mode (resonance) can be attenuated, and noise can be reduced.

It is preferable that the convex portion is provided at a position having the largest amplitude in the natural vibration mode generated by the protective cover, in a portion facing the opening end.
Thus, since the convex part is provided in the position where the amplitude is the largest, the natural vibration mode to be generated can be attenuated efficiently, and the noise can be suitably reduced.

It is desirable that the protective cover includes a plurality (two or more) of the convex portions.
Thus, if it has a several convex part, the stable amplitude control will be attained. In particular, in order to suitably control the amplitude, it is desirable to have three convex portions.
For example, in the case where the protective cover has a substantially box shape with one side opened, it is desirable that at least one of the four side walls is provided with a convex portion.

It is desirable that the plurality of convex portions are provided so as to come into contact with the opening end portion at the portion facing the opening end portion simultaneously with the opening end portion in the natural vibration mode generated by the protective cover. For example, in the natural vibration mode generated by the protective cover, the clearance between each of the plurality of convex portions and the opening end portion may be the same or different from each other.
In this case, since the plurality of convex portions simultaneously contact the opening end portion in a natural vibration mode that generates sound, resonance (resonance) of the protective cover can be efficiently attenuated, and noise can be reduced. In addition, the excitation force received from the protective wall can be distributed to multiple convex parts to weaken the excitation force received by each convex part from the protective wall, thereby reducing the resonance (resonance) and reducing noise. can do.

As a specific embodiment of the convex portion, it is conceivable that the convex portion is provided so as to face the front end surface and the outer side surface of the opening end portion.
Thus, since the convex portion is provided so as to face not only the outer surface of the opening end portion but also the front end surface, the natural vibration mode that generates sound can be attenuated more efficiently.

Preferably, the protective cover for the compressor includes a face plate portion that covers the opening of the protective wall, and the natural vibration mode to be generated is a mode in which the face plate portion vibrates most in the out-of-plane direction. In addition to the face plate portion, the compressor protective cover may have a surrounding wall portion surrounding the outer peripheral surface of the protective wall.
The natural vibration mode that sounds like this is the largest noise when the face plate part vibrates most in the out-of-plane direction. Can do.

It is preferable that a locking claw for fixing to the protective wall is further provided, and the convex portion is provided in the vicinity of the locking claw.
In this case, by providing the convex portion in the vicinity of the locking claw (the restraint point of the protective cover), the convex portion can be reliably brought into contact with the protective wall that is the vibration source in the natural vibration mode that generates sound.

It is desirable that the convex portions are integrally formed.
If it is this, a convex part will be formed in a protective cover in a shaping | molding step, and it will become easy to provide a convex part in a protective cover.

  In addition, the convex part of this invention differs from the rib formed in the back surface of a protective cover, in order to increase the mechanical strength of a protective cover.

  According to the present invention configured as described above, in the natural vibration mode generated by the protective cover, since the convex portion that contacts the protective wall is provided, noise generated by resonance of the protective cover can be reduced.

Sectional drawing which shows the protective wall and protective cover (state in which they separated) concerning this embodiment. Sectional drawing which shows the protective wall and protective cover (attached state) of the embodiment. The A section expanded sectional view of the embodiment. The perspective view which shows the protective cover of the embodiment. The perspective view which shows the protective cover of the embodiment. The schematic diagram which shows the height setting method of the convex part of the embodiment.

  Hereinafter, an embodiment of a protective cover 1 for a compressor according to the present invention will be described.

  The compressor protective cover 1 of the present embodiment protects the terminal 101 provided on the casing 100 of the compressor. A motor or the like is accommodated in the casing 100 of the compressor. The terminal 101 is provided to be exposed to the outside from the casing 100 and has a plurality of connection terminals to which external wiring is connected. In addition, as this compressor, what is used for an air conditioner etc. is mentioned, for example.

  Specifically, the protective cover 1 protects the terminal 101 by being attached to the protective wall 2 surrounding the terminal 101.

  As shown in FIGS. 1 to 3, the protective wall 2 is made of metal such as stainless steel, and is disposed so as to surround the periphery of the terminal 101 (a plurality of connection terminals). The protective wall 2 of the present embodiment has a substantially rectangular shape when viewed from the front (viewed from the opening direction), and is fixed to the casing 100 of the compressor by screws or welding.

  An attachment portion 21 for attaching the protective cover 1 is formed on the side peripheral wall of the protective wall 2. The attachment portion 21 of the present embodiment is a step where the protective cover 1 is caught. In addition, as the attachment part 21, what is necessary is just the structure which the protective cover 1 catches, and the protrusion or recessed part etc. which were provided in the outer surface may be sufficient.

  As shown in FIGS. 2 and 3, the protective cover 1 is attached to the opening end 2 x of the protective wall 2 to cover the opening of the protective wall 2. The opening end 2x is a portion from the opening end (tip surface) 2x2 of the protective wall 2 to the attachment portion 21 (see FIG. 3).

  Specifically, as shown in FIGS. 1 to 5, the protective cover 1 is made of a resin having a general box shape with one surface opened, and has a substantially rectangular cylindrical shape surrounding the outer surface of the protective wall 2. The wall portion 11 and a face plate portion 12 having a substantially rectangular plate shape covering the opening of the protective wall 2 are provided.

  The surrounding wall portion 11 surrounds the outer surface 2x1 of the opening end portion 2x of the protective wall 2, and a free end portion 11x (opening end portion 1x of the protective cover 1) is attached to the attachment portion 21 of the protective wall 2. The latching claw 3 which is a latching part hooked on is provided.

  The locking claws 3 of the present embodiment are provided on mutually opposing walls in the surrounding wall portion 11, and more specifically, as shown in FIG. 3, one locking claw 3 is provided on the upper wall 11a. The lower wall 11b is provided with two locking claws 3. This locking claw 3 has a guide surface 3 a having an inclined surface that spreads outward as it goes to the tip, and a locking surface 3 b that locks to the mounting portion 21.

  Moreover, the surrounding wall part 11 has the horizontal part 11m and the vertical part 11n which form the step part corresponding to the opening edge part 2x of the said protection wall 2, as shown in FIG.

  Further, as shown in FIGS. 4 and 5, a plurality of ribs 4 for increasing the mechanical strength of the protective cover 1 are provided on the inner surface of the protective cover 1, mainly on the inner surface (back surface) of the face plate portion 12. Yes. The plurality of ribs 4 are formed in a lattice shape vertically and horizontally on the back surface (inner surface) of the face plate portion 12.

  When the protective cover 1 configured in this way is attached to the protective wall 2, first, the guide surface 3 a of the locking claw 3 of the surrounding wall portion 11 comes into contact with the opening end 2 x of the protective wall 2, and the protective cover 1 As 1 is pushed in, the locking claw 3 and the surrounding wall 11 are elastically deformed and spread outward. And if it pushes in to a predetermined position, the latching claw 3 will elastically return, it will be caught by the attaching part 21, and the protective cover 1 will be attached to the protective wall 2. FIG.

  Here, as shown in FIG. 3, in a state where the protective cover 1 is attached to the protective wall 2, from the contact surface of the attachment portion 21 with which the engagement surface 3b of the engagement claw 3 contacts, the tip end surface of the opening end portion 2x The distance W1 up to 2 × 2 is configured to be shorter than the distance W2 from the contact surface (the locking surface 3b of the locking claw 3) to the inner surface of the vertical portion 11n of the surrounding wall portion 11. In the present embodiment, for example, the distance W1 is 4 mm, and the distance W2 is 6 mm.

  Thus, the protective cover 1 of the present embodiment has a plurality of convex portions 5 that come into contact with the open end 2x of the protective wall 2 in the natural vibration mode generated by the protective cover 1, as shown in FIGS. doing. In the present embodiment, the natural vibration mode that generates sound is a mode in which the face plate portion 12 vibrates most greatly in the out-of-plane direction. In the protective cover 1 of this embodiment, the natural vibration mode is generated with a natural frequency of 887 Hz.

  As shown in FIG. 3, the plurality of convex portions 5 are provided so as to face the opening end portion 2x of the protective wall 2, and specifically, on the outer surface 2x1 and the tip end surface 2x2 of the opening end portion 2x. It is provided so as to face each other. In more detail, each convex part 5 is provided in the inner surface of the surrounding wall part 11, and covers the horizontal part 11m and the vertical part 11n which form the step part corresponding to the opening edge part 2x of the said protective wall 2. As shown in FIG. Is formed. And the convex part 5 is formed in the horizontal part 11m, and is formed in the outer surface opposing part 51 which is spaced apart and opposed to the outer surface 2x1 of the opening end part 2x, and the vertical part 11n, and the tip of the opening end part 2x. And a front end face facing portion 52 that is spaced apart from and faces the face 2x2. The convex part 5 configured in this way is formed integrally with the protective cover 1 by resin molding.

  In addition, the plurality of convex portions 5 are provided at the position where the amplitude is the largest in the natural vibration mode generated by the protective cover 1 in the portion facing the opening end portion 2x of the protective wall 2. In the natural vibration mode generated by the present embodiment, the upper wall and the lower wall of the surrounding wall portion 11 are the portions having the largest amplitude. Therefore, the plurality of convex portions 5 are provided on the upper wall and the lower wall of the surrounding wall portion 11. (Refer to FIG. 2 etc.).

  By providing the convex portion 5 in this way, when the protective cover 1 vibrates in the natural vibration mode that is generated by the excitation force received from the protective wall 2 in the operating compressor, the outer surface facing portion 51 of the convex portion 5 is obtained. Will contact the outer surface 2x1 of the protective wall 2, or the tip surface facing portion 52 of the convex portion 5 will contact the tip surface 2x2 of the protective wall 2.

  Specifically, the plurality of convex portions 5 are provided in the vicinity of the locking claws 3 provided on the upper wall and the lower wall of the surrounding wall portion 11 as shown in FIGS. More specifically, the protective cover 1 is provided behind the locking claw 3 in the mounting direction. The protective cover 1 of the present embodiment has a configuration having three locking claws 3, and one convex portion 5 is provided at the rear in the mounting direction with respect to each locking claw 3.

  Further, the plurality of convex portions 5 are in contact with the outer surface 2x1 or the front end surface 2x2 of the opening end 2x in the natural vibration mode generated by the protective cover 1 at the portion facing the opening end 2x of the protective wall 2 at the same time. Is provided. Specifically, by adjusting the clearance between each of the plurality of projections 5 and the outer surface 2x1 and the tip surface 2x2 of the opening end 2x, the plurality of projections 5 are provided so as to be in contact with the opposite end 2x simultaneously. It has been. Here, the clearance includes the first clearance between the outer surface facing portion 51 of the convex portion 5 and the outer surface 2x1 of the opening end portion 2x, and the tip surface facing portion 52 of the convex portion 5 and the opening end portion 2x. Since the plurality of convex portions 5 come into contact with the opening end portion 2x simultaneously with the second clearance between the first end surface 2x2 and the tip end surface 2x2, both the first clearance and the second clearance are adjusted. Become.

  That is, the height dimension of the convex portion 5 with respect to the inner surface of the surrounding wall portion 11 is set so that the amplitude of each portion provided with the convex portion 5 is the same when vibrating in the natural vibration mode generated by the protective cover 1. Has been. In consideration of the ease of assembling the protective cover 1, the height of the convex portion 5 is set so that the clearance is at least 0.5 mm.

  Next, a method for designing the protective cover 1 of the present embodiment will be briefly described.

  First, the natural vibration mode (mode shape) at each natural frequency of the protective cover 1 is confirmed, and the natural vibration mode that causes the noise is identified (specification of the sound generation mode).

  Then, in the natural vibration mode that generates sound, in the portion that can contact the protective wall 2 (the surrounding wall portion 11), the position having the largest amplitude is specified, and the convex portion 5 is set at the position (the convex portion 5). Position setting).

  Then, the height dimension of each convex part 5 is set, ensuring the clearance (for example, 0.5 mm) which ensures the assembly | attachment property to the protective wall 2 of the protective cover 1 (the height setting of the convex part 5). At this time, the natural vibration mode that does not generate sound is not adversely affected.

  Here, the method of setting the height of the convex portion 5 is as shown in FIG. 6 when each position (point A, point B, point C) where the three convex portions 5 are provided is viewed as a free end. The vibration center (support rotation center) is set so as to pass through the center of gravity G of the protective cover 1.

  In FIG. 6, the center of gravity of the protective cover 1 is located on the left side of the center of the protective cover. At this time, it is assumed that the vibration center is located at the center of the protective cover 1 when the clearances between the convex portions 5 and the opening end portions are the same. In this case, the center of vibration by the three convex portions 5 is increased by increasing the clearance between the convex portion 5 at the point B and the opening end portion and decreasing the clearance between the convex portion 5 at the point A and the opening end portion. Is moved to the position of the center of gravity of the protective cover 1. Thus, by matching the vibration center by the three convex portions 5 and the center of gravity position of the protective cover 1, the three convex portions 5 are simultaneously in contact with the opening end portions in the sounding natural vibration mode.

<Effect of this embodiment>
According to the protective cover 1 configured as described above, in the natural vibration mode generated by the protective cover 1, since the convex portion 5 is in contact with the opening end 2 x of the protective wall 2, the vibration received from the protective wall 2 is provided. Even if the protective cover 1 resonates (resonates) due to force, the natural vibration mode (resonance) can be attenuated by the convex portion 5 coming into contact with the outer surface 2x1 or the front end surface 2x2 of the opening end 2x. Can be reduced. In the present embodiment, the natural vibration mode that generates sound is the mode in which the face plate portion 12 vibrates most in the out-of-plane direction, and the noise reduction effect can be made remarkable by attenuating this mode.

  Moreover, the amplitude in the natural vibration mode of the protective cover 1 can be reduced by the convex portion 5, and the excitation force received from the protective wall 2 can be weakened. Also by this, the natural vibration mode (resonance) can be attenuated, and noise can be reduced.

  Furthermore, since the plurality of convex portions 5 are provided at the position having the largest amplitude, the natural vibration mode to be generated can be attenuated efficiently, and noise can be suitably reduced.

  And since the several convex part 5 contacts the opening edge part 2x simultaneously in the natural vibration mode which produces | generates, the resonance (resonance) of the protective cover 1 can be attenuate | damped efficiently and noise can be reduced. Further, the excitation force received from the protective wall 2 can be distributed to the plurality of convex portions 5 to weaken the excitation force received by the respective convex portions 5 from the protective wall 2, and the resonance (resonance) can be attenuated. , Noise can be reduced.

  In addition, by providing the convex portion 5 in the vicinity of the locking claw 3 (the restraint point of the protective cover), the convex portion 5 can be reliably brought into contact with the protective wall that is the vibration source in the natural vibration mode that generates sound. .

  In addition, by changing the shape of the convex portion 5 in accordance with the natural vibration mode, the frequency of noise to be reduced, etc., vibration can be reduced according to the individual compressors.

  In addition, the fitting force between the protective wall 2 and the protective cover 1 can be freely changed by changing the shape of the locking claw 3 such as the inclination angle of the guide surface 3a of the locking claw 3 and the size of the locking surface 3b. it can.

The present invention is not limited to the first embodiment.
For example, in the above-described embodiment, the surrounding wall portion has a substantially rectangular cylindrical shape, but may have various shapes such as a cylindrical shape.

  Further, the position where the convex portion 5 is provided is not limited to the vicinity of the locking claw 3 and may be a position facing the opening end portion.

  Further, the position where the convex portion 5 is provided may not be the position where the amplitude is the largest in the natural vibration mode where the sound is generated.

  In addition, it goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Protective cover 11 ... Enclosure wall part 12 ... Face plate part 2 ... Protective wall 2x ... Opening edge part 2x1 ... Outer surface 2x2 ... Tip surface

Claims (8)

A protective cover for a compressor that is attached to a protective wall that surrounds a connection terminal provided on a casing of the compressor,
A protective cover for a compressor, which is provided so as to face the opening end portion of the protective wall and includes at least one convex portion that comes into contact with the opening end portion in a natural vibration mode generated by the protective cover for the compressor.   2. The protective cover for a compressor according to claim 1, wherein the convex portion is provided at a position having the largest amplitude in a natural vibration mode generated by the protective cover at a portion facing the opening end. A plurality of the convex portions,
3. The compressor according to claim 1, wherein the plurality of convex portions are provided so as to be in contact with the opening end portion simultaneously with the natural vibration mode generated by the protective cover at a portion facing the opening end portion. Protective cover.   The protective cover for a compressor according to any one of claims 1 to 3, wherein the convex portion is provided so as to face a front end surface and an outer surface of the opening end portion. A face plate covering the opening of the protective wall;
The protective cover for a compressor according to claim 2, wherein the natural vibration mode to be generated is a mode in which the face plate portion vibrates most in an out-of-plane direction. It further comprises a locking claw for fixing to the protective wall,
The protective cover for a compressor according to any one of claims 1 to 5, wherein the convex portion is provided in the vicinity of the locking claw.   The protective cover as described in any one of Claims 1 thru | or 6 in which the said convex part is integrally formed.   The compressor using the protective cover for compressors as described in any one of Claims 1 thru | or 7.