JPH0261394A - Air conditioner and blower protection guard - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air conditioner, and in particular, to reducing noise generated from a protective guard portion of a blower and forming a lightweight and inexpensive protective guard portion. The present invention relates to an air conditioner suitable for.

[Prior Art] The protective guard part of the blower in a conventional air conditioner is made by cutting up a flat material plate of a unit case and blowing air through the gap, as described in U.S. Pat. No. 4,171,937. It was a shutter-like thing that could be passed through, and the guard part and the unit case surface on which the guard part was provided were made on the same plane.

[Problems to be Solved by the Invention] The above-mentioned conventional technology does not take into account the reduction of wind noise generated in the protective guard portion of the blower.

In other words, when the blower is operated, the wind is released as a swirling flow, whereas the guard part is a straight shutter, and if there is resistance such as a heat exchanger, the wind spreads out. Not only does the angle of attack between the flow and the shutter become large because of the discharge, but the outlet end of the guard is not rounded.
Since the width is also large, separation occurs and so-called wind noise is generated. This type of guard is arranged at small pitches to prevent fingers from being inserted, and since a large number of guard elements are provided, the total number of guard elements is extremely noisy.

At the same time, there was a problem of reducing the air volume6.Also, because the guard part is flush with the unit surface, the guard part gets close to the blower, and the passage of air is limited to the corresponding area in front of the blower. This also resulted in problems such as increased noise and reduced air volume.

Furthermore, the guard portion is not sufficiently strong and a flat plate is insufficient from the safety point of view.

In addition, in order to mount the blower motor, a separate and strong motor installation member is required, resulting in higher costs and increased weight. In response to this, no consideration has been given to attaching the motor directly to the center of the protective guard without using a separate mounting member.

The present invention was made in order to solve the above-mentioned problems in the prior art, and it is possible to obtain a large air volume by using a protective guard with low ventilation resistance, and also to obtain significantly low noise with the same air volume, and also to reduce vibration. The purpose is to provide an air conditioner that is small in size, has excellent productivity, is inexpensive, small in size, and lightweight.

[Means for Solving the Problems] In order to achieve the above object, the configuration of the air conditioner according to the present invention is such that a blower is provided in a unit case, and a protective guard for the blower is provided on the outer surface of the unit. In the device that is integrally molded from a raw material plate, the guard element constituting the protective guard includes a plurality of first gratings formed substantially radially from the center of rotation of the blower, and a plurality of first gratings formed approximately radially from the center of rotation of the blower. and a large number of second lattices formed substantially concentrically with respect to each other, and the cross-sectional shape of the first lattice has an aperture surface or a flange surface that is substantially perpendicular or inclined with respect to the protective guard surface, The cross-sectional shape of the second lattice is a bifold aperture with roundness in front and/or rear of the protective guard surface, and the other end has a thickness equal to or less than the thickness of the roundness. In this case, a partial protruding constriction portion facing the front of the unit is provided on the unit case portion on the line of the first lattice so as to protrude from the guard element and the surrounding unit case surface, or alternatively, on the line of the first lattice. The unit case part is recessed to avoid the damage, and an opening is also provided on the outer periphery.

In more detail, it is possible to install the blower motor in the center of the protective guard, and a continuous aperture line is provided in the first grid line from the center side to the protruding constriction part, and the position of the protruding constriction part is adjusted to the unit small. Avoiding the top and bottom of the blower center line, which is the dimension surface, the cross section of the second grid is 100% of the material of the unit.
An even better result can be achieved by selecting the shape and pitch so as to utilize % of the mouth ring, and by creating a shape that smoothly spreads from the inner surface of the mouth ring toward the maximum opening surface of the second lattice.

[Function] Since the second lattice of the guard element constituting the protective guard for the blower is approximately concentric or concentric circles around the blower,
It matches well with the swirling discharge wind, and furthermore, since the cross section of the second grid is rounded, wind noise is reduced. In particular, the guard element protrudes from the surrounding unit case surface, and the protrusion also creates an opening on the outer periphery, so that it matches the spread of the discharged air and allows air to be smoothly blown in the outer periphery direction. In this case, the wind on the outer diameter side of the blower, where the wind speed is high, can be widely dispersed, so that the noise reduction effect is large. Further, by forming the mouth ring into a shape that smoothly expands from the inner surface toward the maximum opening surface of the second lattice, the protruding effect of the guard can be further enhanced. The aperture surface or flange surface of the first lattice in the radial arrangement and the protruding aperture of the on-line unit case part of the first lattice increase the strength of the entire guard against longitudinal loads.

Combined with the rounded part of the guard element, it becomes even stronger.

This makes it possible to easily support the blower motor in the center of the protective guard. Vibration of the guard and unit case can also be reduced.

Furthermore, by partially providing the protruding aperture only on the lines of the first grating, the ring, the upper second
A major feature is that the entire guard can be made to protrude without causing distortion to the lattice. For example, if you try to extrude the first lattice etc. after molding the guard on the same surface as the unit case surface, there will be no holding part and the second lattice will be dragged by the elongation of the first lattice, resulting in a large ring diameter. As a result, the first lattice spacing of the second lattice becomes a linear or spider web-like polygon.

On the other hand, if you try to make a guard element after the container drawing,
It becomes difficult to process an opening on the outer peripheral surface of the protruding guard. former,
In the latter case, the center part shifts and alignment with the blower becomes difficult. The partially protruding diaphragm of the present invention can eliminate the above problems.

In addition, by providing the partial protruding constriction portions above and below the unit passing through the fan center line, an installation location can be easily secured. Therefore, a large, low-speed blower can be accommodated without increasing the height of the unit, contributing to noise reduction.

As a result of the above, an air conditioner that not only has low noise but also has excellent productivity, is inexpensive, small, and lightweight can be obtained.

[Example] Hereinafter, each example of the present invention will be described with reference to FIGS. 1 to 9.

FIG. 1 is a front view showing a protective guard for an air conditioner according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view taken along line A-A in FIG. 1, and FIG. B-B arrow perspective view, Fig. 4,
A cross-sectional view taken along the line C-C in Figure 1, and Figure 5 is a cross-sectional view taken along the line D-D in Figure 1.
It is an arrow sectional view. In the figure, thick arrows indicate the direction of wind flow.

In each case, 1 is a heat exchanger, 2 is a propeller-type blower, 3 is a blower motor, 4 is a unit case, 5 is a unit case that guides the discharge air of the blower 2, protects the blower 2, and This is a protective guard part of a blower for preventing fingers from being inserted into the air blower.

The protective guard portion 5 is formed integrally with the upper surface and front surface of the unit case 4 from the same material plate 1, for example, a steel plate. 6 is a motor mounting part, and the protective guard part 5
It is provided at the center of the unit case 4, and is made of the same material plate as the unit case 4, and the flange portion 3a of the motor 3 is fixed with screws 6a. 7 is a decorative cover for the motor.

The air conditioning function is such that when the blower 2 is rotated by the motor 3, air is sucked in from the heat exchanger 1 side, heat exchanged, and then sent out from the protective guard part 5 side as cold or warm air into the room, thereby performing air conditioning. It is.

The guard elements constituting the protection guard section 5 will be explained.

The first grating 5a is arranged radially (
A plurality of grids are formed on the lattice (see Figure 1), which serves as the main strength member for supporting the blower 2 and the blower motor 3, and its cross-sectional shape is as shown in Figures 3 and 4. , the aperture surface 5a or flange surface 5a2 is provided which is substantially perpendicular or inclined to the protective guard surface.

Reference numeral 4a denotes a partially protruding constriction portion toward the front of the unit, which is formed in the unit case 4 as shown in FIG. It is continuous.

The aperture surface 5a□ is the aperture part 4a that protrudes from the center of the protective guard.
It has been established.

The second grid 5b has a pitch between the grids of the center of the blower 2 such that the dimension g (see FIG. 2) cannot be inserted with a finger.
These are the main guard members formed in large numbers in concentric circles. Therefore, as shown in Figures 2 and 3, the cross-sectional shape is rounded in front (downstream side of the wind) with respect to the protective guard surface, and backward (upstream side of the wind) than the roundness thickness t2. )
The diaphragm is formed into a bi-fold type diaphragm so that the thickness t is small and the opening area on the wind inflow side is large. This second lattice 5b
can be formed by making a number of notches concentric with the center of rotation of the blower at a certain pitch in the material of the unit case 4 and adding a bifold process to the material, and the pitch of the cuts and the roundness thickness are set appropriately. This allows materials to be used without having to be discarded. For example, the cutting pitch is 13W1, the roundness thickness L2 is 3I, and the inside of the lattice is 5III.
When the value is 11, an interstitial dimension g of approximately 10+nm is obtained, and insertion of a finger can be prevented by just one.

The bifold surface is continuous with the flange surface 5a2 of the first grating 5a, and together with the first grating 5a, increases the strength of the entire protective guard portion 5.

What is particularly distinctive about this structure is that the unit case 4
By providing a partial protruding constriction portion 4a, the entire guard element is made to protrude beyond the surface of the unit case 4, thereby providing an opening portion 5c also on the outer circumferential side of the protective guard. In addition, the inner peripheral surface of the mouth ring 8 is made convex toward the blower side to match the inner surface 5e of the flange of the opening 5c.
The inner diameter of the leeward end is gradually increased to form the flange inner surface 5.
It is also characteristic that the ventilation passage is formed in a shape that spreads toward the end and is almost continuous with e.

9 is a small opening between the flange 8a of the mouth ring 8 and the protruding constriction portion 4a of the unit case 4.

According to such an air conditioner, the second grid 5b is arranged in the same shape so as to substantially match the direction of the swirling discharge air of the blower 2,
In addition, since the thickness t□ on the inflow side is small, wind can easily flow in, and the roundness of the downstream outflow side makes it difficult for peeling to occur, so noise generation can be reduced. In addition, by providing a partial protruding aperture 4a on the unit case 4, the blower 2 can be expanded without increasing the depth of the unit body.
The distance between the air blower 2 and the protective guard part 5 can be increased, and the air discharged from the blower 2 can be widely dispersed and discharged almost in the radial direction, thereby reducing the wind speed passing through the protective guard part 5 and reducing wind noise. can be done.

Moreover, even if the protective guard part 5 moves forward, there is no need to increase the depth of the mouth ring 8. In this case, since the air path smoothly expands from the mouth ring 8 toward the flange inner surface 5e, which is the largest opening of the second lattice 5b, the effect of reducing the wind noise in the low range can be further increased.

According to an experimental example of a propeller-type blower with a blower diameter of 425 mm and a blade twist angle of 27 degrees, the heat exchanger was a cross-fin pipe type with a single row of pipes, and the protective guard configuration shown in Fig. 2 was used. Regarding the effect of obtaining the air volume, it was confirmed that the partial protruding constriction portion 4a of the unit case 4 reduced the noise by 3 dB, and the widening of the air path reduced the noise by 1 dB.

Regarding the protruding constriction part 4a, it has a major feature in manufacturing that it is possible to obtain a structure in which the entire protective guard part protrudes without giving any distortion to the second lattice 5b of the protective guard part 5. By providing this, there is no need to increase the unit height dimension, and the unit case 4 is strengthened from the second lattice 5b by the aperture, and vibrations of the unit case 4 can be reduced.

Furthermore, the small opening 9 provided between the mouth ring 8 and the flange 8a has the effect of flushing out pretreatment liquid during painting, leftover paint during painting, and the like. Furthermore, in the first grating 5a, the aperture surface 5a1 is continuously provided from the center of the protective guard to the protruding constrictor part 4a on the unit case 4, and the flange surface 5a2 and the bifold surface of the second grating are at least continuous. As a result, the blower motor 3 can be mounted directly on the protective guard part 5 because it can withstand the load caused by the dynamic imbalance of the blower during operation, vibration during transportation, and some falling accidents. This makes it possible and does not require a new motor base or the like.

Next, FIG. 6 is a perspective view showing another embodiment of the second lattice.

In the second lattice 5b in the previous embodiment, when the cross-sectional tip of the bifold aperture is completely closed, paint, rainwater, etc. may accumulate near the center of the arc after processing before painting. Therefore, as shown in FIG. 6, the above problem can be solved by partially reducing the number of folded parts and providing openings 5b.

Next, FIG. 7 is a partial vertical sectional view showing the main parts of an air conditioner according to another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 2 are the same parts as in the previous embodiment, so the explanation thereof will be omitted.

In the embodiment shown in FIG. 7, the unit case 4A is not provided with a protruding diaphragm, but on the contrary, the part that avoids the first grid 10 is recessed toward the mouth ring 11 side, giving the unit case 4A an elegant appearance. .

In addition, regarding the protective guard portion 5A, the guard element on the center side of the blower 2 is made to gradually protrude further downstream (forward) than the guard element on the outer side in the radial direction of the blower to disperse the longitudinal load. is increasing the strength of.

Next, FIGS. 8 and 9 are sectional views showing still other embodiments of the second grating.

The second lattice 5b' shown in FIG.
The tips 5b, 5b3 were intentionally shifted. As a result, the opening area on the upstream side (inlet side) can be increased to facilitate the inflow of wind, and the uneven ends of the bifold can be eliminated to improve the appearance.

The second lattice 5b' shown in FIG. 9 is completely folded in half, and has the unique effect of easily achieving dimensional accuracy in production.

In each of the above embodiments, the guard element is rounded on the leeward side, but if the appearance of the unit is not a problem, even if the guard element is rounded on the windward side, the performance effect will be second to none.
Obtained similarly to the embodiment shown.

[Effects of the Invention] As described above, according to the present invention, a large air volume can be obtained by using a protective guard with low ventilation resistance, and significantly low noise can be obtained with the same air volume. Excellent performance, inexpensive and small size.

A lightweight air conditioner can be provided.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a protective guard for an air conditioner according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view taken along line A-A in FIG. 1, and FIG. B-B arrow perspective view, Fig. 4,
FIG. 2 is a sectional view taken along the line C-C in FIG. 1; FIG. 5 is a sectional view taken along the line D-D in FIG. 1, and FIG.
FIG. 7 is a perspective view showing another embodiment of the lattice, and FIG.
FIG. 8 and FIG. 9 are both sectional views showing still other embodiments of the second grating. 2...Blower, 4,4A...Unit case, 4a
...Protruding constriction part, 5,5A...Protective guard part, 5a
...first grating, 5a... aperture surface, 5a, ... flange surface, 5b, 5b', 5b'... second grating, 5
b,, 5b□... tip, 5C... opening, 9...
Small opening, 10...first grid.

Claims (1)

[Claims] 1. A guard element constituting the protective guard in a device in which a blower is provided in a unit case, and a protective guard for the blower is integrally molded on the outer surface of the unit from a material plate of the unit case. is composed of a plurality of first gratings formed substantially radially from the rotation center side of the blower, and a plurality of second gratings formed substantially concentrically with respect to the rotation center of the blower, and the The cross-sectional shape of the first lattice has an aperture surface or flange surface that is substantially perpendicular or inclined with respect to the protective guard surface, and the cross-sectional shape of the second lattice has a cross-sectional shape that is forward or backward with respect to the protective guard surface.
Alternatively, each of them should be a bifold-shaped aperture with roundness, and the other end should have a thickness equal to or less than the thickness of the roundness. Either provide a partial protruding constriction part on the other side to protrude from the guard element and the surrounding unit case surface, or recess the unit case part that avoids the line of the first grid and create an opening on the outer periphery as well. An air conditioner characterized by the following: 2. A propeller-type blower is provided in a unit case, and a protective guard for the blower is integrally molded with a material plate of the unit case on the outer surface of the unit, and the guard element constituting the protective guard is attached to the blower. A plurality of first
It consists of a lattice and a number of second lattices formed substantially concentrically with respect to the center of rotation of the blower, and the cross-sectional shape of the first lattice has a flange portion facing upwind in the blowing direction. , the cross-sectional shape of the second grid is rounded on the leeward side in the air blowing direction, and the thickness on the windward side is equal to or less than the rounded thickness on the leeward side, and the unit is placed in the unit case part on the line of the first grid. An air conditioner characterized in that a partially protruding constriction part facing forward is provided to protrude beyond the guard element and the surrounding unit case surface, and an opening is also provided in the outer periphery. 3. In either of claims 1 or 2, the center line of the first grid is continuous from the rotation center side of the blower to the protruding constriction portion radially outward of the blower. An air conditioner characterized by having a diaphragm line. 4. An air conditioner according to claim 1 or 2, characterized in that a blower motor is attached to the center of a protective guard portion of the blower. 5. In either of claims 1 or 2, the guard element on the center side of the protective guard of the blower is gradually positioned downstream of the guard element on the outer side of the blower in the radial direction. An air conditioner characterized in that the air conditioner is made to protrude. 6. In either of claims 1 or 2, the outside of the first grid in the radial direction of the blower is located at a position offset from the vertical center line of the unit passing through the center of the blower, and the An air conditioner characterized in that a unit case is provided with a partial constriction section facing the leeward side that is continuous with the first grid and continues outward in the radial direction of the blower of one grid. 7. In either of claims 1 or 2, the dimensions of the cross-sectional shape of the second lattice are set within a range that eliminates the punched-out part of the unit case material plate. Air conditioner. 8. In either of claims 1 or 2, the mouth ring for a blower at the rear of the protective guard part has an inner circumferential surface convex toward the blower and an inner diameter of the leeward end gradually increasing. An air conditioner characterized in that the protective guard is formed so as to be substantially continuous with the inner surface of the flange of the maximum opening of the protective guard. 9. In either of claims 1 or 2, the cross-sectional shape of the second lattice is partially opened at the windward end to allow gas, liquid, etc. to be vented as appropriate. An air conditioner characterized by: 10. The air conditioner according to claim 1 or 2, characterized in that the bifold aperture of the second lattice and the flange of the first lattice are continuous. 11. The air blower according to claim 1 or 2, characterized in that a small opening is provided between the flange of the blower mouth ring and the protruding constriction part of the first lattice. harmonizer. 12. An air conditioner according to claim 1 or 2, characterized in that the cross-sectional shape of the second lattice is formed so that the tips of the two folds are shifted. 13. A blower is provided in a unit case, and a guard is provided on the outer surface of the unit to protect the blower, wherein a plurality of first gratings are formed substantially radially from the center of rotation of the blower, and a rotation of the blower. consisting of a large number of second lattices formed approximately concentrically with respect to the center of the
The cross-sectional shape of the first grating has an aperture surface or flange surface having a substantially perpendicular or inclined portion with respect to the protective guard surface, and the cross-sectional shape of the second grating has a rounded shape on one or both of the protective guard surfaces. A blower protection guard for an air conditioner, characterized in that it has a bifold shape and is attached to a unit case. 14. A blower protection guard for an air conditioner according to claim 13, characterized in that the protection guard is attached to protrude from the unit case surface.